feat: add scrape job result persistence for effectiveness tracking

fix: prevent ts-rs serde warnings
feat: add confidence-based RMP matching with manual review workflow
2026-01-31 12:23:33 -06:00 · 2026-01-30 01:37:41 -06:00 · 2026-01-30 01:36:57 -06:00 · 2026-01-30 01:31:11 -06:00 · 2026-01-29 23:56:45 -06:00 · 2026-01-29 23:44:05 -06:00
111 changed files with 12894 additions and 1727 deletions
@@ -2,5 +2,5 @@
 /target

 # ts-rs bindings
-web/src/lib/bindings/*.ts
+web/src/lib/bindings/**/*.ts
 !web/src/lib/bindings/index.ts
@@ -26,6 +26,21 @@ dependencies = [
 "memchr",
 ]

+[[package]]
+name = "alloc-no-stdlib"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc7bb162ec39d46ab1ca8c77bf72e890535becd1751bb45f64c597edb4c8c6b3"
+
+[[package]]
+name = "alloc-stdlib"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94fb8275041c72129eb51b7d0322c29b8387a0386127718b096429201a5d6ece"
+dependencies = [
+ "alloc-no-stdlib",
+]
+
 [[package]]
 name = "allocator-api2"
 version = "0.2.21"
@@ -106,6 +121,19 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "async-compression"
+version = "0.4.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93c1f86859c1af3d514fa19e8323147ff10ea98684e6c7b307912509f50e67b2"
+dependencies = [
+ "compression-codecs",
+ "compression-core",
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.89"
@@ -149,11 +177,12 @@ checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"

 [[package]]
 name = "axum"
-version = "0.8.4"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "021e862c184ae977658b36c4500f7feac3221ca5da43e3f25bd04ab6c79a29b5"
+checksum = "8b52af3cb4058c895d37317bb27508dccc8e5f2d39454016b297bf4a400597b8"
 dependencies = [
 "axum-core",
+ "base64 0.22.1",
 "bytes",
 "form_urlencoded",
 "futures-util",
@@ -168,13 +197,14 @@ dependencies = [
 "mime",
 "percent-encoding",
 "pin-project-lite",
- "rustversion",
- "serde",
+ "serde_core",
 "serde_json",
 "serde_path_to_error",
 "serde_urlencoded",
+ "sha1",
 "sync_wrapper 1.0.2",
 "tokio",
+ "tokio-tungstenite 0.28.0",
 "tower",
 "tower-layer",
 "tower-service",
@@ -183,9 +213,9 @@ dependencies = [

 [[package]]
 name = "axum-core"
-version = "0.5.2"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68464cd0412f486726fb3373129ef5d2993f90c34bc2bc1c1e9943b2f4fc7ca6"
+checksum = "08c78f31d7b1291f7ee735c1c6780ccde7785daae9a9206026862dab7d8792d1"
 dependencies = [
 "bytes",
 "futures-core",
@@ -194,13 +224,37 @@ dependencies = [
 "http-body-util",
 "mime",
 "pin-project-lite",
- "rustversion",
 "sync_wrapper 1.0.2",
 "tower-layer",
 "tower-service",
 "tracing",
 ]

+[[package]]
+name = "axum-extra"
+version = "0.12.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fef252edff26ddba56bbcdf2ee3307b8129acb86f5749b68990c168a6fcc9c76"
+dependencies = [
+ "axum",
+ "axum-core",
+ "bytes",
+ "form_urlencoded",
+ "futures-core",
+ "futures-util",
+ "http 1.3.1",
+ "http-body 1.0.1",
+ "http-body-util",
+ "mime",
+ "pin-project-lite",
+ "serde_core",
+ "serde_html_form",
+ "serde_path_to_error",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
 [[package]]
 name = "backtrace"
 version = "0.3.75"
@@ -218,11 +272,12 @@ dependencies = [

 [[package]]
 name = "banner"
-version = "0.3.4"
+version = "0.5.0"
 dependencies = [
 "anyhow",
 "async-trait",
 "axum",
+ "axum-extra",
 "bitflags 2.9.4",
 "chrono",
 "clap",
@@ -260,6 +315,7 @@ dependencies = [
 "tracing-subscriber",
 "ts-rs",
 "url",
+ "urlencoding",
 "yansi",
 ]

@@ -305,6 +361,27 @@ dependencies = [
 "generic-array",
 ]

+[[package]]
+name = "brotli"
+version = "8.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bd8b9603c7aa97359dbd97ecf258968c95f3adddd6db2f7e7a5bef101c84560"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+ "brotli-decompressor",
+]
+
+[[package]]
+name = "brotli-decompressor"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "874bb8112abecc98cbd6d81ea4fa7e94fb9449648c93cc89aa40c81c24d7de03"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+]
+
 [[package]]
 name = "bstr"
 version = "1.12.0"
@@ -382,6 +459,8 @@ version = "1.2.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42bc4aea80032b7bf409b0bc7ccad88853858911b7713a8062fdc0623867bedc"
 dependencies = [
+ "jobserver",
+ "libc",
 "shlex",
 ]

@@ -476,6 +555,26 @@ dependencies = [
 "time",
 ]

+[[package]]
+name = "compression-codecs"
+version = "0.4.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "680dc087785c5230f8e8843e2e57ac7c1c90488b6a91b88caa265410568f441b"
+dependencies = [
+ "brotli",
+ "compression-core",
+ "flate2",
+ "memchr",
+ "zstd",
+ "zstd-safe",
+]
+
+[[package]]
+name = "compression-core"
+version = "0.4.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75984efb6ed102a0d42db99afb6c1948f0380d1d91808d5529916e6c08b49d8d"
+
 [[package]]
 name = "concurrent-queue"
 version = "2.5.0"
@@ -1617,6 +1716,16 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"

+[[package]]
+name = "jobserver"
+version = "0.1.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9afb3de4395d6b3e67a780b6de64b51c978ecf11cb9a462c66be7d4ca9039d33"
+dependencies = [
+ "getrandom 0.3.3",
+ "libc",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.77"
@@ -2688,9 +2797,19 @@ dependencies = [

 [[package]]
 name = "serde"
-version = "1.0.219"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f0e2c6ed6606019b4e29e69dbaba95b11854410e5347d525002456dbbb786b6"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
 dependencies = [
 "serde_derive",
 ]
@@ -2706,15 +2825,28 @@ dependencies = [

 [[package]]
 name = "serde_derive"
-version = "1.0.219"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b0276cf7f2c73365f7157c8123c21cd9a50fbbd844757af28ca1f5925fc2a00"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
 "proc-macro2",
 "quote",
 "syn 2.0.106",
 ]

+[[package]]
+name = "serde_html_form"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2f2d7ff8a2140333718bb329f5c40fc5f0865b84c426183ce14c97d2ab8154f"
+dependencies = [
+ "form_urlencoded",
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde_core",
+]
+
 [[package]]
 name = "serde_json"
 version = "1.0.143"
@@ -2787,7 +2919,7 @@ dependencies = [
 "static_assertions",
 "time",
 "tokio",
- "tokio-tungstenite",
+ "tokio-tungstenite 0.21.0",
 "tracing",
 "typemap_rev",
 "typesize",
@@ -3475,10 +3607,22 @@ dependencies = [
 "rustls-pki-types",
 "tokio",
 "tokio-rustls 0.25.0",
- "tungstenite",
+ "tungstenite 0.21.0",
 "webpki-roots 0.26.11",
 ]

+[[package]]
+name = "tokio-tungstenite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d25a406cddcc431a75d3d9afc6a7c0f7428d4891dd973e4d54c56b46127bf857"
+dependencies = [
+ "futures-util",
+ "log",
+ "tokio",
+ "tungstenite 0.28.0",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.7.16"
@@ -3555,14 +3699,17 @@ version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "adc82fd73de2a9722ac5da747f12383d2bfdb93591ee6c58486e0097890f05f2"
 dependencies = [
+ "async-compression",
 "bitflags 2.9.4",
 "bytes",
+ "futures-core",
 "futures-util",
 "http 1.3.1",
 "http-body 1.0.1",
 "iri-string",
 "pin-project-lite",
 "tokio",
+ "tokio-util",
 "tower",
 "tower-layer",
 "tower-service",
@@ -3674,6 +3821,7 @@ version = "11.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4994acea2522cd2b3b85c1d9529a55991e3ad5e25cdcd3de9d505972c4379424"
 dependencies = [
+ "chrono",
 "serde_json",
 "thiserror 2.0.16",
 "ts-rs-macros",
@@ -3712,6 +3860,23 @@ dependencies = [
 "utf-8",
 ]

+[[package]]
+name = "tungstenite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8628dcc84e5a09eb3d8423d6cb682965dea9133204e8fb3efee74c2a0c259442"
+dependencies = [
+ "bytes",
+ "data-encoding",
+ "http 1.3.1",
+ "httparse",
+ "log",
+ "rand 0.9.2",
+ "sha1",
+ "thiserror 2.0.16",
+ "utf-8",
+]
+
 [[package]]
 name = "typemap_rev"
 version = "0.3.0"
@@ -3813,6 +3978,12 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "utf-8"
 version = "0.7.6"
@@ -4508,3 +4679,31 @@ dependencies = [
 "quote",
 "syn 2.0.106",
 ]
+
+[[package]]
+name = "zstd"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e91ee311a569c327171651566e07972200e76fcfe2242a4fa446149a3881c08a"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f49c4d5f0abb602a93fb8736af2a4f4dd9512e36f7f570d66e65ff867ed3b9d"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.16+zstd.1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e19ebc2adc8f83e43039e79776e3fda8ca919132d68a1fed6a5faca2683748"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
@@ -1,6 +1,6 @@
 [package]
 name = "banner"
-version = "0.3.4"
+version = "0.5.0"
 edition = "2024"
 default-run = "banner"

@@ -11,7 +11,7 @@ embed-assets = ["dep:rust-embed", "dep:mime_guess"]
 [dependencies]
 anyhow = "1.0.99"
 async-trait = "0.1"
-axum = "0.8.4"
+axum = { version = "0.8.4", features = ["ws"] }
 bitflags = { version = "2.9.4", features = ["serde"] }
 chrono = { version = "0.4.42", features = ["serde"] }
 compile-time = "0.2.0"
@@ -48,15 +48,17 @@ url = "2.5"
 governor = "0.10.1"
 serde_path_to_error = "0.1.17"
 num-format = "0.4.4"
-tower-http = { version = "0.6.0", features = ["cors", "trace", "timeout"] }
+tower-http = { version = "0.6.0", features = ["cors", "trace", "timeout", "compression-full"] }
 rust-embed = { version = "8.0", features = ["include-exclude"], optional = true }
 mime_guess = { version = "2.0", optional = true }
 clap = { version = "4.5", features = ["derive"] }
 rapidhash = "4.1.0"
 yansi = "1.0.1"
 extension-traits = "2"
-ts-rs = { version = "11.1.0", features = ["serde-compat", "serde-json-impl"] }
+ts-rs = { version = "11.1.0", features = ["chrono-impl", "serde-compat", "serde-json-impl", "no-serde-warnings"] }
 html-escape = "0.2.13"
+axum-extra = { version = "0.12.5", features = ["query"] }
+urlencoding = "2.1.3"

 [dev-dependencies]

@@ -7,6 +7,9 @@ FROM oven/bun:1 AS frontend-builder

 WORKDIR /app

+# Install zstd for pre-compression
+RUN apt-get update && apt-get install -y --no-install-recommends zstd && rm -rf /var/lib/apt/lists/*
+
 # Copy backend Cargo.toml for build-time version retrieval
 COPY ./Cargo.toml ./

@@ -19,8 +22,8 @@ RUN bun install --frozen-lockfile
 # Copy frontend source code
 COPY ./web ./

-# Build frontend
-RUN bun run build
+# Build frontend, then pre-compress static assets (gzip, brotli, zstd)
+RUN bun run build && bun run scripts/compress-assets.ts

 # --- Chef Base Stage ---
 FROM lukemathwalker/cargo-chef:latest-rust-${RUST_VERSION} AS chef
@@ -112,5 +115,5 @@ HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
 ENV HOSTS=0.0.0.0,[::]

 # Implicitly uses PORT environment variable
-# temporary: running without 'scraper' service
-CMD ["sh", "-c", "exec ./banner --services web,bot"]
+# Runs all services: web, bot, and scraper
+CMD ["sh", "-c", "exec ./banner"]
@@ -1,51 +1,292 @@
 set dotenv-load
-default_services := "bot,web,scraper"

 default:
    just --list

-# Run all checks (format, clippy, tests, lint)
-check:
-    cargo fmt --all -- --check
-    cargo clippy --all-features -- --deny warnings
-    cargo nextest run -E 'not test(export_bindings)'
-    bun run --cwd web check
-    bun run --cwd web test
+# Run all checks in parallel. Pass -f/--fix to auto-format and fix first.
+[script("bun")]
+check *flags:
+    const args = "{{flags}}".split(/\s+/).filter(Boolean);
+    let fix = false;
+    for (const arg of args) {
+      if (arg === "-f" || arg === "--fix") fix = true;
+      else { console.error(`Unknown flag: ${arg}`); process.exit(1); }
+    }

-# Generate TypeScript bindings from Rust types (ts-rs)
-bindings:
-    cargo test export_bindings
+    const run = (cmd) => {
+      const proc = Bun.spawnSync(cmd, { stdio: ["inherit", "inherit", "inherit"] });
+      if (proc.exitCode !== 0) process.exit(proc.exitCode);
+    };

-# Run all tests (Rust + frontend)
-test: test-rust test-web
+    if (fix) {
+      console.log("\x1b[1;36m→ Fixing...\x1b[0m");
+      run(["cargo", "fmt", "--all"]);
+      run(["bun", "run", "--cwd", "web", "format"]);
+      run(["cargo", "clippy", "--all-features", "--fix", "--allow-dirty", "--allow-staged",
+           "--", "--deny", "warnings"]);
+      console.log("\x1b[1;36m→ Verifying...\x1b[0m");
+    }

-# Run only Rust tests (excludes ts-rs bindings generation)
-test-rust *ARGS:
-    cargo nextest run -E 'not test(export_bindings)' {{ARGS}}
+    const checks = [
+      { name: "rustfmt",      cmd: ["cargo", "fmt", "--all", "--", "--check"] },
+      { name: "clippy",       cmd: ["cargo", "clippy", "--all-features", "--", "--deny", "warnings"] },
+      { name: "rust-test",    cmd: ["cargo", "nextest", "run", "-E", "not test(export_bindings)"] },
+      { name: "svelte-check", cmd: ["bun", "run", "--cwd", "web", "check"] },
+      { name: "biome",        cmd: ["bun", "run", "--cwd", "web", "format:check"] },
+      { name: "web-test",     cmd: ["bun", "run", "--cwd", "web", "test"] },
+      // { name: "sqlx-prepare", cmd: ["cargo", "sqlx", "prepare", "--check"] },
+    ];

-# Run only frontend tests
-test-web:
-    bun run --cwd web test
+    const isTTY = process.stderr.isTTY;
+    const start = Date.now();
+    const remaining = new Set(checks.map(c => c.name));

-# Quick check: clippy + tests + typecheck (skips formatting)
-check-quick:
-    cargo clippy --all-features -- --deny warnings
-    cargo nextest run -E 'not test(export_bindings)'
-    bun run --cwd web check
+    const promises = checks.map(async (check) => {
+      const proc = Bun.spawn(check.cmd, {
+        env: { ...process.env, FORCE_COLOR: "1" },
+        stdout: "pipe", stderr: "pipe",
+      });
+      const [stdout, stderr] = await Promise.all([
+        new Response(proc.stdout).text(),
+        new Response(proc.stderr).text(),
+      ]);
+      await proc.exited;
+      return { ...check, stdout, stderr, exitCode: proc.exitCode,
+               elapsed: ((Date.now() - start) / 1000).toFixed(1) };
+    });

-# Run the Banner API search demo (hits live UTSA API, ~20s)
-search *ARGS:
-    cargo run -q --bin search -- {{ARGS}}
+    const interval = isTTY ? setInterval(() => {
+      const elapsed = ((Date.now() - start) / 1000).toFixed(1);
+      process.stderr.write(`\r\x1b[K${elapsed}s [${Array.from(remaining).join(", ")}]`);
+    }, 100) : null;
+
+    let anyFailed = false;
+    for (const promise of promises) {
+      const r = await promise;
+      remaining.delete(r.name);
+      if (isTTY) process.stderr.write(`\r\x1b[K`);
+      if (r.exitCode !== 0) {
+        anyFailed = true;
+        process.stdout.write(`\x1b[31m✗ ${r.name}\x1b[0m (${r.elapsed}s)\n`);
+        if (r.stdout) process.stdout.write(r.stdout);
+        if (r.stderr) process.stderr.write(r.stderr);
+      } else {
+        process.stdout.write(`\x1b[32m✓ ${r.name}\x1b[0m (${r.elapsed}s)\n`);
+      }
+    }
+
+    if (interval) clearInterval(interval);
+    if (isTTY) process.stderr.write(`\r\x1b[K`);
+    process.exit(anyFailed ? 1 : 0);

 # Format all Rust and TypeScript code
 format:
    cargo fmt --all
    bun run --cwd web format

-# Check formatting without modifying (CI-friendly)
-format-check:
-    cargo fmt --all -- --check
-    bun run --cwd web format:check
+# Run tests. Usage: just test [rust|web|<nextest filter args>]
+[script("bun")]
+test *args:
+    const input = "{{args}}".trim();
+    const run = (cmd) => {
+      const proc = Bun.spawnSync(cmd, { stdio: ["inherit", "inherit", "inherit"] });
+      if (proc.exitCode !== 0) process.exit(proc.exitCode);
+    };
+    if (input === "web") {
+      run(["bun", "run", "--cwd", "web", "test"]);
+    } else if (input === "rust") {
+      run(["cargo", "nextest", "run", "-E", "not test(export_bindings)"]);
+    } else if (input === "") {
+      run(["cargo", "nextest", "run", "-E", "not test(export_bindings)"]);
+      run(["bun", "run", "--cwd", "web", "test"]);
+    } else {
+      run(["cargo", "nextest", "run", ...input.split(/\s+/)]);
+    }
+
+# Generate TypeScript bindings from Rust types (ts-rs)
+bindings:
+    cargo test export_bindings
+
+# Run the Banner API search demo (hits live UTSA API, ~20s)
+search *ARGS:
+    cargo run -q --bin search -- {{ARGS}}
+
+# Pass args to binary after --: just dev -n -- --some-flag
+# Dev server. Flags: -f(rontend) -b(ackend) -W(no-watch) -n(o-build) -r(elease) -e(mbed) --tracing <fmt>
+[script("bun")]
+dev *flags:
+    const argv = "{{flags}}".split(/\s+/).filter(Boolean);
+
+    let frontendOnly = false, backendOnly = false;
+    let noWatch = false, noBuild = false, release = false, embed = false;
+    let tracing = "pretty";
+    const passthrough = [];
+
+    let i = 0;
+    let seenDashDash = false;
+    while (i < argv.length) {
+      const arg = argv[i];
+      if (seenDashDash) { passthrough.push(arg); i++; continue; }
+      if (arg === "--") { seenDashDash = true; i++; continue; }
+      if (arg.startsWith("--")) {
+        if (arg === "--frontend-only") frontendOnly = true;
+        else if (arg === "--backend-only") backendOnly = true;
+        else if (arg === "--no-watch") noWatch = true;
+        else if (arg === "--no-build") noBuild = true;
+        else if (arg === "--release") release = true;
+        else if (arg === "--embed") embed = true;
+        else if (arg === "--tracing") { tracing = argv[++i] || "pretty"; }
+        else { console.error(`Unknown flag: ${arg}`); process.exit(1); }
+      } else if (arg.startsWith("-") && arg.length > 1) {
+        for (const c of arg.slice(1)) {
+          if (c === "f") frontendOnly = true;
+          else if (c === "b") backendOnly = true;
+          else if (c === "W") noWatch = true;
+          else if (c === "n") noBuild = true;
+          else if (c === "r") release = true;
+          else if (c === "e") embed = true;
+          else { console.error(`Unknown flag: -${c}`); process.exit(1); }
+        }
+      } else { console.error(`Unknown argument: ${arg}`); process.exit(1); }
+      i++;
+    }
+
+    // -e implies -b (no point running Vite if assets are embedded)
+    if (embed) backendOnly = true;
+    // -n implies -W (no build means no watch)
+    if (noBuild) noWatch = true;
+
+    // Validate conflicting flags
+    if (frontendOnly && backendOnly) {
+      console.error("Cannot use -f and -b together (or -e implies -b)");
+      process.exit(1);
+    }
+
+    const runFrontend = !backendOnly;
+    const runBackend = !frontendOnly;
+    const profile = release ? "release" : "dev";
+    const profileDir = release ? "release" : "debug";
+
+    const procs = [];
+    const cleanup = async () => {
+      for (const p of procs) p.kill();
+      await Promise.all(procs.map(p => p.exited));
+    };
+    process.on("SIGINT", async () => { await cleanup(); process.exit(0); });
+    process.on("SIGTERM", async () => { await cleanup(); process.exit(0); });
+
+    // Build frontend first when embedding assets (backend will bake them in)
+    if (embed && !noBuild) {
+      console.log(`\x1b[1;36m→ Building frontend (for embedding)...\x1b[0m`);
+      const fb = Bun.spawnSync(["bun", "run", "--cwd", "web", "build"], {
+        stdio: ["inherit", "inherit", "inherit"],
+      });
+      if (fb.exitCode !== 0) process.exit(fb.exitCode);
+    }
+
+    // Frontend: Vite dev server
+    if (runFrontend) {
+      const proc = Bun.spawn(["bun", "run", "--cwd", "web", "dev"], {
+        stdio: ["inherit", "inherit", "inherit"],
+      });
+      procs.push(proc);
+    }
+
+    // Backend
+    if (runBackend) {
+      const backendArgs = [`--tracing`, tracing, ...passthrough];
+      const bin = `target/${profileDir}/banner`;
+
+      if (noWatch) {
+        // Build first unless -n (skip build)
+        if (!noBuild) {
+          console.log(`\x1b[1;36m→ Building backend (${profile})...\x1b[0m`);
+          const cargoArgs = ["cargo", "build", "--bin", "banner"];
+          if (!embed) cargoArgs.push("--no-default-features");
+          if (release) cargoArgs.push("--release");
+          const build = Bun.spawnSync(cargoArgs, { stdio: ["inherit", "inherit", "inherit"] });
+          if (build.exitCode !== 0) { cleanup(); process.exit(build.exitCode); }
+        }
+
+        // Run the binary directly (no watch)
+        const { existsSync } = await import("fs");
+        if (!existsSync(bin)) {
+          console.error(`Binary not found: ${bin}`);
+          console.error(`Run 'just build${release ? "" : " -d"}' first, or remove -n to use bacon.`);
+          cleanup();
+          process.exit(1);
+        }
+        console.log(`\x1b[1;36m→ Running ${bin} (no watch)\x1b[0m`);
+        const proc = Bun.spawn([bin, ...backendArgs], {
+          stdio: ["inherit", "inherit", "inherit"],
+        });
+        procs.push(proc);
+      } else {
+        // Bacon watch mode
+        const baconArgs = ["bacon", "--headless", "run", "--"];
+        if (!embed) baconArgs.push("--no-default-features");
+        if (release) baconArgs.push("--profile", "release");
+        baconArgs.push("--", ...backendArgs);
+        const proc = Bun.spawn(baconArgs, {
+          stdio: ["inherit", "inherit", "inherit"],
+        });
+        procs.push(proc);
+      }
+    }
+
+    // Wait for any process to exit, then kill the rest
+    const results = procs.map((p, i) => p.exited.then(code => ({ i, code })));
+    const first = await Promise.race(results);
+    cleanup();
+    process.exit(first.code);
+
+# Production build. Flags: -d(ebug) -f(rontend-only) -b(ackend-only)
+[script("bun")]
+build *flags:
+    const argv = "{{flags}}".split(/\s+/).filter(Boolean);
+
+    let debug = false, frontendOnly = false, backendOnly = false;
+    for (const arg of argv) {
+      if (arg.startsWith("--")) {
+        if (arg === "--debug") debug = true;
+        else if (arg === "--frontend-only") frontendOnly = true;
+        else if (arg === "--backend-only") backendOnly = true;
+        else { console.error(`Unknown flag: ${arg}`); process.exit(1); }
+      } else if (arg.startsWith("-") && arg.length > 1) {
+        for (const c of arg.slice(1)) {
+          if (c === "d") debug = true;
+          else if (c === "f") frontendOnly = true;
+          else if (c === "b") backendOnly = true;
+          else { console.error(`Unknown flag: -${c}`); process.exit(1); }
+        }
+      } else { console.error(`Unknown argument: ${arg}`); process.exit(1); }
+    }
+
+    if (frontendOnly && backendOnly) {
+      console.error("Cannot use -f and -b together");
+      process.exit(1);
+    }
+
+    const run = (cmd) => {
+      const proc = Bun.spawnSync(cmd, { stdio: ["inherit", "inherit", "inherit"] });
+      if (proc.exitCode !== 0) process.exit(proc.exitCode);
+    };
+
+    const buildFrontend = !backendOnly;
+    const buildBackend = !frontendOnly;
+    const profile = debug ? "debug" : "release";
+
+    if (buildFrontend) {
+      console.log("\x1b[1;36m→ Building frontend...\x1b[0m");
+      run(["bun", "run", "--cwd", "web", "build"]);
+    }
+
+    if (buildBackend) {
+      console.log(`\x1b[1;36m→ Building backend (${profile})...\x1b[0m`);
+      const cmd = ["cargo", "build", "--bin", "banner"];
+      if (!debug) cmd.push("--release");
+      run(cmd);
+    }

 # Start PostgreSQL in Docker and update .env with connection string
 # Commands: start (default), reset, rm
@@ -115,86 +356,6 @@ db cmd="start":
      await updateEnv();
    }

-# Auto-reloading frontend server
-frontend:
-    bun run --cwd web dev
-
-# Production build of frontend
-build-frontend:
-    bun run --cwd web build
-
-# Auto-reloading backend server (with embedded assets)
-backend *ARGS:
-    bacon --headless run -- -- {{ARGS}}
-
-# Auto-reloading backend server (no embedded assets, for dev proxy mode)
-backend-dev *ARGS:
-    bacon --headless run -- --no-default-features -- {{ARGS}}
-
-# Production build
-build:
-    bun run --cwd web build
-    cargo build --release --bin banner
-
-# Run auto-reloading development build with release characteristics
-dev-build *ARGS='--services web --tracing pretty': build-frontend
-    bacon --headless run -- --profile dev-release -- {{ARGS}}
-
-# Auto-reloading development build: Vite frontend + backend (no embedded assets, proxies to Vite)
-[parallel]
-dev *ARGS='--services web,bot': frontend (backend-dev ARGS)
-
-# Smoke test: start web server, hit API endpoints, verify responses
-[script("bash")]
-test-smoke port="18080":
-    set -euo pipefail
-    PORT={{port}}
-
-    cleanup() { kill "$SERVER_PID" 2>/dev/null; wait "$SERVER_PID" 2>/dev/null; }
-
-    # Start server in background
-    PORT=$PORT cargo run -q --no-default-features -- --services web --tracing json &
-    SERVER_PID=$!
-    trap cleanup EXIT
-
-    # Wait for server to be ready (up to 15s)
-    for i in $(seq 1 30); do
-        if curl -sf "http://localhost:$PORT/api/health" >/dev/null 2>&1; then break; fi
-        if ! kill -0 "$SERVER_PID" 2>/dev/null; then echo "FAIL: server exited early"; exit 1; fi
-        sleep 0.5
-    done
-
-    PASS=0; FAIL=0
-    check() {
-        local label="$1" url="$2" expected="$3"
-        body=$(curl -sf "$url") || { echo "FAIL: $label - request failed"; FAIL=$((FAIL+1)); return; }
-        if echo "$body" | grep -q "$expected"; then
-            echo "PASS: $label"
-            PASS=$((PASS+1))
-        else
-            echo "FAIL: $label - expected '$expected' in: $body"
-            FAIL=$((FAIL+1))
-        fi
-    }
-
-    check "GET /api/health" "http://localhost:$PORT/api/health" '"status":"healthy"'
-    check "GET /api/status" "http://localhost:$PORT/api/status" '"version"'
-    check "GET /api/metrics" "http://localhost:$PORT/api/metrics" '"banner_api"'
-
-    # Test 404
-    STATUS=$(curl -s -o /dev/null -w "%{http_code}" "http://localhost:$PORT/api/nonexistent")
-    if [ "$STATUS" = "404" ]; then
-        echo "PASS: 404 on unknown route"
-        PASS=$((PASS+1))
-    else
-        echo "FAIL: expected 404, got $STATUS"
-        FAIL=$((FAIL+1))
-    fi
-
-    echo ""
-    echo "Results: $PASS passed, $FAIL failed"
-    [ "$FAIL" -eq 0 ]
-
 alias b := bun
 bun *ARGS:
 	cd web && bun {{ ARGS }}
@@ -29,8 +29,7 @@ The application consists of three modular services that can be run independently
 bun install --cwd web  # Install frontend dependencies
 cargo build  # Build the backend

-just dev # Runs auto-reloading dev build
-just dev --services bot,web # Runs auto-reloading dev build, running only the bot and web services
+just dev # Runs auto-reloading dev build with all services
 just dev-build # Development build with release characteristics (frontend is embedded, non-auto-reloading)

 just build # Production build that embeds assets
@@ -4,10 +4,33 @@

 The Banner project is built as a multi-service application with the following components:

- **Discord Bot Service**: Handles Discord interactions and commands
- **Web Service**: Serves the React frontend and provides API endpoints
- **Scraper Service**: Background data collection and synchronization
- **Database Layer**: PostgreSQL for persistent storage
+- **Discord Bot Service**: Handles Discord interactions and commands (Serenity/Poise)
+- **Web Service**: Axum HTTP server serving the SvelteKit frontend and REST API endpoints
+- **Scraper Service**: Background data collection and synchronization with job queue
+- **Database Layer**: PostgreSQL 17 for persistent storage (SQLx with compile-time verification)
+- **RateMyProfessors Client**: GraphQL-based bulk sync of professor ratings
+
+### Frontend Stack
+
+- **SvelteKit** with Svelte 5 runes (`$state`, `$derived`, `$effect`)
+- **Tailwind CSS v4** via `@tailwindcss/vite`
+- **bits-ui** for headless UI primitives (comboboxes, tooltips, dropdowns)
+- **TanStack Table** for interactive data tables with sorting and column control
+- **OverlayScrollbars** for styled, theme-aware scrollable areas
+- **ts-rs** generates TypeScript type bindings from Rust structs
+
+### API Endpoints
+
+| Endpoint | Description |
+|---|---|
+| `GET /api/health` | Health check |
+| `GET /api/status` | Service status, version, and commit hash |
+| `GET /api/metrics` | Basic metrics |
+| `GET /api/courses/search` | Paginated course search with filters (term, subject, query, open-only, sort) |
+| `GET /api/courses/:term/:crn` | Single course detail with instructors and RMP ratings |
+| `GET /api/terms` | Available terms from reference cache |
+| `GET /api/subjects?term=` | Subjects for a term, ordered by enrollment |
+| `GET /api/reference/:category` | Reference data lookups (campuses, instructional methods, etc.) |

 ## Technical Analysis

@@ -6,7 +6,41 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).

 ## [Unreleased]

-## [0.1.0] - 2026-01
+## [0.5.0] - 2026-01-29
+
+### Added
+
+- Multi-select subject filtering with searchable comboboxes.
+- Smart instructor name abbreviation for compact table display.
+- Delivery mode indicators and tooltips in location column.
+- Page selector dropdown with animated pagination controls.
+- FLIP animations for smooth table row transitions during pagination.
+- Time tooltip with detailed meeting schedule and day abbreviations.
+- Reusable SimpleTooltip component for consistent UI hints.
+
+### Changed
+
+- Consolidated query logic and eliminated N+1 instructor loads via batch fetching.
+- Consolidated menu snippets and strengthened component type safety.
+- Enhanced table scrolling with OverlayScrollbars and theme-aware styling.
+- Eliminated initial theme flash on page load.
+
+## [0.4.0] - 2026-01-28
+
+### Added
+
+- Web-based course search UI with interactive data table, multi-column sorting, and column visibility controls.
+- TypeScript type bindings generated from Rust types via ts-rs.
+- RateMyProfessors integration: bulk professor sync via GraphQL and inline rating display in search results.
+- Course detail expansion panel with enrollment, meeting times, and instructor info.
+- OverlayScrollbars integration for styled, theme-aware scrollable areas.
+- Pagination component for navigating large search result sets.
+- Footer component with version display.
+- API endpoints: `/api/courses/search`, `/api/courses/:term/:crn`, `/api/terms`, `/api/subjects`, `/api/reference/:category`.
+- Frontend API client with typed request/response handling and test coverage.
+- Course formatting utilities with comprehensive unit tests.
+
+## [0.3.4] - 2026-01

 ### Added

@@ -4,7 +4,8 @@ This folder contains detailed documentation for the Banner project. This file ac

 ## Files

- [`FEATURES.md`](FEATURES.md) - Current features, implemented functionality, and future roadmap
+- [`CHANGELOG.md`](CHANGELOG.md) - Notable changes by version
+- [`ROADMAP.md`](ROADMAP.md) - Planned features and priorities
 - [`BANNER.md`](BANNER.md) - General API documentation on the Banner system
 - [`ARCHITECTURE.md`](ARCHITECTURE.md) - Technical implementation details, system design, and analysis

@@ -3,12 +3,9 @@
 ## Now

 - **Notification and subscription system** - Subscribe to courses and get alerts on seat availability, waitlist movement, and detail changes (time, location, professor, seats). DB schema exists.
- **RateMyProfessor integration** - Show professor ratings inline with search results and course details.
 - **Professor name search filter** - Filter search results by instructor. Backend code exists but is commented out.
- **Subject/major search filter** - Search by department code (e.g. CS, MAT). Also partially implemented.
 - **Autocomplete for search fields** - Typeahead for course titles, course numbers, professors, and terms.
- **Test coverage expansion** - Broaden coverage with pure function tests (term parsing, search parsing, job types), session/rate-limiter tests, and more DB integration tests.
- **Web course search UI** - Add a browser-based course search interface to the dashboard, supplementing the Discord bot.
+- **Test coverage expansion** - Broaden coverage with session/rate-limiter tests and more DB integration tests.

 ## Soon

@@ -29,3 +26,10 @@
 - **CRN direct lookup** - Look up a course by its CRN without going through search.
 - **Metrics dashboard** - Surface scraper and service metrics visually on the web dashboard.
 - **Privileged error feedback** - Detailed error information surfaced to bot admins when commands fail.
+
+## Done
+
+- **Web course search UI** - Browser-based course search with interactive data table, sorting, pagination, and column controls. *(0.4.0)*
+- **RateMyProfessor integration** - Bulk professor sync via GraphQL with inline ratings in search results. *(0.4.0)*
+- **Subject/major search filter** - Multi-select subject filtering with searchable comboboxes. *(0.5.0)*
+- **Test coverage expansion** - Unit tests for course formatting, API client, query builder, CLI args, and config parsing. *(0.3.4–0.4.0)*
@@ -0,0 +1,7 @@
+-- Add queued_at column to track when a job last entered the "ready to pick up" state.
+-- For fresh jobs this equals execute_at; for retried jobs it is updated to NOW().
+ALTER TABLE scrape_jobs
+    ADD COLUMN queued_at TIMESTAMPTZ NOT NULL DEFAULT NOW();
+
+-- Backfill existing rows: set queued_at = execute_at (best approximation)
+UPDATE scrape_jobs SET queued_at = execute_at;
@@ -0,0 +1,19 @@
+CREATE TABLE users (
+    discord_id BIGINT PRIMARY KEY,
+    discord_username TEXT NOT NULL,
+    discord_avatar_hash TEXT,
+    is_admin BOOLEAN NOT NULL DEFAULT false,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE user_sessions (
+    id TEXT PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES users(discord_id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    expires_at TIMESTAMPTZ NOT NULL,
+    last_active_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_user_sessions_user_id ON user_sessions(user_id);
+CREATE INDEX idx_user_sessions_expires_at ON user_sessions(expires_at);
@@ -0,0 +1,80 @@
+-- Collapse instructors from per-banner-id rows to per-person rows (deduped by lowercased email).
+-- All existing RMP matches are deliberately dropped; the new auto-matcher will re-score from scratch.
+
+-- 1. Create the new instructors table (1 row per person, keyed by email)
+CREATE TABLE instructors_new (
+    id SERIAL PRIMARY KEY,
+    display_name VARCHAR NOT NULL,
+    email VARCHAR NOT NULL,
+    rmp_professor_id INTEGER UNIQUE REFERENCES rmp_professors(legacy_id),
+    rmp_match_status VARCHAR NOT NULL DEFAULT 'unmatched',
+    CONSTRAINT instructors_email_unique UNIQUE (email)
+);
+
+-- 2. Populate from existing data, deduplicating by lowercased email.
+--    For each email, pick the display_name from the row with the highest banner_id
+--    (deterministic tiebreaker). All rmp fields start fresh (NULL / 'unmatched').
+INSERT INTO instructors_new (display_name, email)
+SELECT DISTINCT ON (LOWER(email))
+    display_name,
+    LOWER(email)
+FROM instructors
+ORDER BY LOWER(email), banner_id DESC;
+
+-- 3. Create the new course_instructors table with integer FK and banner_id column
+CREATE TABLE course_instructors_new (
+    course_id INTEGER NOT NULL REFERENCES courses(id) ON DELETE CASCADE,
+    instructor_id INTEGER NOT NULL REFERENCES instructors_new(id) ON DELETE CASCADE,
+    banner_id VARCHAR NOT NULL,
+    is_primary BOOLEAN NOT NULL DEFAULT false,
+    PRIMARY KEY (course_id, instructor_id)
+);
+
+-- 4. Populate from old data, mapping old banner_id → new instructor id via lowercased email.
+--    Use DISTINCT ON to handle cases where multiple old banner_ids for the same person
+--    taught the same course (would cause duplicate (course_id, instructor_id) pairs).
+INSERT INTO course_instructors_new (course_id, instructor_id, banner_id, is_primary)
+SELECT DISTINCT ON (ci.course_id, inew.id)
+    ci.course_id,
+    inew.id,
+    ci.instructor_id,  -- old banner_id
+    ci.is_primary
+FROM course_instructors ci
+JOIN instructors iold ON iold.banner_id = ci.instructor_id
+JOIN instructors_new inew ON inew.email = LOWER(iold.email)
+ORDER BY ci.course_id, inew.id, ci.is_primary DESC;
+
+-- 5. Drop old tables (course_instructors first due to FK dependency)
+DROP TABLE course_instructors;
+DROP TABLE instructors;
+
+-- 6. Rename new tables into place
+ALTER TABLE instructors_new RENAME TO instructors;
+ALTER TABLE course_instructors_new RENAME TO course_instructors;
+
+-- 7. Rename constraints to match the final table names
+ALTER TABLE instructors RENAME CONSTRAINT instructors_new_pkey TO instructors_pkey;
+ALTER TABLE instructors RENAME CONSTRAINT instructors_new_rmp_professor_id_key TO instructors_rmp_professor_id_key;
+ALTER TABLE course_instructors RENAME CONSTRAINT course_instructors_new_pkey TO course_instructors_pkey;
+
+-- 8. Recreate indexes
+CREATE INDEX idx_course_instructors_instructor ON course_instructors (instructor_id);
+CREATE INDEX idx_instructors_rmp_status ON instructors (rmp_match_status);
+CREATE INDEX idx_instructors_email ON instructors (email);
+
+-- 9. Create rmp_match_candidates table
+CREATE TABLE rmp_match_candidates (
+    id SERIAL PRIMARY KEY,
+    instructor_id INTEGER NOT NULL REFERENCES instructors(id) ON DELETE CASCADE,
+    rmp_legacy_id INTEGER NOT NULL REFERENCES rmp_professors(legacy_id),
+    score REAL NOT NULL,
+    score_breakdown JSONB NOT NULL DEFAULT '{}',
+    status VARCHAR NOT NULL DEFAULT 'pending',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    resolved_at TIMESTAMPTZ,
+    resolved_by BIGINT REFERENCES users(discord_id),
+    CONSTRAINT uq_candidate_pair UNIQUE (instructor_id, rmp_legacy_id)
+);
+
+CREATE INDEX idx_match_candidates_instructor ON rmp_match_candidates (instructor_id);
+CREATE INDEX idx_match_candidates_status ON rmp_match_candidates (status);
@@ -0,0 +1,24 @@
+-- Multi-RMP profile support: allow many RMP profiles per instructor.
+-- Each RMP profile still links to at most one instructor (rmp_legacy_id UNIQUE).
+
+-- 1. Create junction table
+CREATE TABLE instructor_rmp_links (
+    id SERIAL PRIMARY KEY,
+    instructor_id INTEGER NOT NULL REFERENCES instructors(id) ON DELETE CASCADE,
+    rmp_legacy_id INTEGER NOT NULL UNIQUE REFERENCES rmp_professors(legacy_id),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    created_by BIGINT REFERENCES users(discord_id),
+    source VARCHAR NOT NULL DEFAULT 'manual'  -- 'auto' | 'manual'
+);
+
+CREATE INDEX idx_instructor_rmp_links_instructor ON instructor_rmp_links (instructor_id);
+
+-- 2. Migrate existing matches
+INSERT INTO instructor_rmp_links (instructor_id, rmp_legacy_id, source)
+SELECT id, rmp_professor_id,
+       CASE rmp_match_status WHEN 'auto' THEN 'auto' ELSE 'manual' END
+FROM instructors
+WHERE rmp_professor_id IS NOT NULL;
+
+-- 3. Drop old column (and its unique constraint)
+ALTER TABLE instructors DROP COLUMN rmp_professor_id;
@@ -0,0 +1,31 @@
+-- Scrape job results log: one row per completed (or failed) job for effectiveness tracking.
+CREATE TABLE scrape_job_results (
+    id              BIGSERIAL PRIMARY KEY,
+    target_type     target_type NOT NULL,
+    payload         JSONB NOT NULL,
+    priority        scrape_priority NOT NULL,
+
+    -- Timing
+    queued_at       TIMESTAMPTZ NOT NULL,
+    started_at      TIMESTAMPTZ NOT NULL,
+    completed_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    duration_ms     INT NOT NULL,
+
+    -- Outcome
+    success         BOOLEAN NOT NULL,
+    error_message   TEXT,
+    retry_count     INT NOT NULL DEFAULT 0,
+
+    -- Effectiveness (NULL when success = false)
+    courses_fetched     INT,
+    courses_changed     INT,
+    courses_unchanged   INT,
+    audits_generated    INT,
+    metrics_generated   INT
+);
+
+CREATE INDEX idx_scrape_job_results_target_time
+    ON scrape_job_results (target_type, completed_at);
+
+CREATE INDEX idx_scrape_job_results_completed
+    ON scrape_job_results (completed_at);
@@ -6,6 +6,7 @@ use crate::services::bot::BotService;
 use crate::services::manager::ServiceManager;
 use crate::services::web::WebService;
 use crate::state::AppState;
+use crate::web::auth::AuthConfig;
 use anyhow::Context;
 use figment::value::UncasedStr;
 use figment::{Figment, providers::Env};
@@ -84,6 +85,14 @@ impl App {
            info!(error = ?e, "Could not load reference cache on startup (may be empty)");
        }

+        // Seed the initial admin user if configured
+        if let Some(admin_id) = config.admin_discord_id {
+            let user = crate::data::users::ensure_seed_admin(&db_pool, admin_id as i64)
+                .await
+                .context("Failed to seed admin user")?;
+            info!(discord_id = admin_id, username = %user.discord_username, "Seed admin ensured");
+        }
+
        Ok(App {
            config,
            db_pool,
@@ -97,7 +106,16 @@ impl App {
    pub fn setup_services(&mut self, services: &[ServiceName]) -> Result<(), anyhow::Error> {
        // Register enabled services with the manager
        if services.contains(&ServiceName::Web) {
-            let web_service = Box::new(WebService::new(self.config.port, self.app_state.clone()));
+            let auth_config = AuthConfig {
+                client_id: self.config.discord_client_id.clone(),
+                client_secret: self.config.discord_client_secret.clone(),
+                redirect_base: self.config.discord_redirect_uri.clone(),
+            };
+            let web_service = Box::new(WebService::new(
+                self.config.port,
+                self.app_state.clone(),
+                auth_config,
+            ));
            self.service_manager
                .register_service(ServiceName::Web.as_str(), web_service);
        }
@@ -108,6 +126,7 @@ impl App {
                self.banner_api.clone(),
                self.app_state.reference_cache.clone(),
                self.app_state.service_statuses.clone(),
+                self.app_state.scrape_job_tx.clone(),
            ));
            self.service_manager
                .register_service(ServiceName::Scraper.as_str(), scraper_service);
@@ -40,9 +40,9 @@ impl BannerApi {
                .cookie_store(false)
                .user_agent(user_agent())
                .tcp_keepalive(Some(std::time::Duration::from_secs(60 * 5)))
-                .read_timeout(std::time::Duration::from_secs(10))
-                .connect_timeout(std::time::Duration::from_secs(10))
-                .timeout(std::time::Duration::from_secs(30))
+                .read_timeout(std::time::Duration::from_secs(20))
+                .connect_timeout(std::time::Duration::from_secs(15))
+                .timeout(std::time::Duration::from_secs(40))
                .build()
                .context("Failed to create HTTP client")?,
        )
@@ -320,10 +320,11 @@ pub enum MeetingType {
    Unknown(String),
 }

-impl MeetingType {
-    /// Parse from the meeting type string
-    pub fn from_string(s: &str) -> Self {
-        match s {
+impl std::str::FromStr for MeetingType {
+    type Err = std::convert::Infallible;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        Ok(match s {
            "HB" | "H2" | "H1" => MeetingType::HybridBlended,
            "OS" => MeetingType::OnlineSynchronous,
            "OA" => MeetingType::OnlineAsynchronous,
@@ -331,9 +332,11 @@ impl MeetingType {
            "ID" => MeetingType::IndependentStudy,
            "FF" => MeetingType::FaceToFace,
            other => MeetingType::Unknown(other.to_string()),
-        }
+        })
    }
+}

+impl MeetingType {
    /// Get description for the meeting type
    pub fn description(&self) -> &'static str {
        match self {
@@ -424,7 +427,7 @@ impl MeetingScheduleInfo {
                        end: now,
                    }
                });
-        let meeting_type = MeetingType::from_string(&meeting_time.meeting_type);
+        let meeting_type: MeetingType = meeting_time.meeting_type.parse().unwrap();
        let location = MeetingLocation::from_meeting_time(meeting_time);
        let duration_weeks = date_range.weeks_duration();

@@ -10,8 +10,9 @@ pub struct Range {
    pub high: i32,
 }

-/// Builder for constructing Banner API search queries
+/// Builder for constructing Banner API search queries.
 #[derive(Debug, Clone, Default)]
+#[allow(dead_code)]
 pub struct SearchQuery {
    subject: Option<String>,
    title: Option<String>,
@@ -32,6 +33,7 @@ pub struct SearchQuery {
    course_number_range: Option<Range>,
 }

+#[allow(dead_code)]
 impl SearchQuery {
    /// Creates a new SearchQuery with default values
    pub fn new() -> Self {
@@ -67,7 +69,6 @@ impl SearchQuery {
    }

    /// Adds a keyword to the query
-    #[allow(dead_code)]
    pub fn keyword<S: Into<String>>(mut self, keyword: S) -> Self {
        match &mut self.keywords {
            Some(keywords) => keywords.push(keyword.into()),
@@ -77,63 +78,54 @@ impl SearchQuery {
    }

    /// Sets whether to search for open courses only
-    #[allow(dead_code)]
    pub fn open_only(mut self, open_only: bool) -> Self {
        self.open_only = Some(open_only);
        self
    }

    /// Sets the term part for the query
-    #[allow(dead_code)]
    pub fn term_part(mut self, term_part: Vec<String>) -> Self {
        self.term_part = Some(term_part);
        self
    }

    /// Sets the campuses for the query
-    #[allow(dead_code)]
    pub fn campus(mut self, campus: Vec<String>) -> Self {
        self.campus = Some(campus);
        self
    }

    /// Sets the instructional methods for the query
-    #[allow(dead_code)]
    pub fn instructional_method(mut self, instructional_method: Vec<String>) -> Self {
        self.instructional_method = Some(instructional_method);
        self
    }

    /// Sets the attributes for the query
-    #[allow(dead_code)]
    pub fn attributes(mut self, attributes: Vec<String>) -> Self {
        self.attributes = Some(attributes);
        self
    }

    /// Sets the instructors for the query
-    #[allow(dead_code)]
    pub fn instructor(mut self, instructor: Vec<u64>) -> Self {
        self.instructor = Some(instructor);
        self
    }

    /// Sets the start time for the query
-    #[allow(dead_code)]
    pub fn start_time(mut self, start_time: Duration) -> Self {
        self.start_time = Some(start_time);
        self
    }

    /// Sets the end time for the query
-    #[allow(dead_code)]
    pub fn end_time(mut self, end_time: Duration) -> Self {
        self.end_time = Some(end_time);
        self
    }

    /// Sets the credit range for the query
-    #[allow(dead_code)]
    pub fn credits(mut self, low: i32, high: i32) -> Self {
        self.min_credits = Some(low);
        self.max_credits = Some(high);
@@ -141,14 +133,12 @@ impl SearchQuery {
    }

    /// Sets the minimum credits for the query
-    #[allow(dead_code)]
    pub fn min_credits(mut self, value: i32) -> Self {
        self.min_credits = Some(value);
        self
    }

    /// Sets the maximum credits for the query
-    #[allow(dead_code)]
    pub fn max_credits(mut self, value: i32) -> Self {
        self.max_credits = Some(value);
        self
@@ -161,7 +151,6 @@ impl SearchQuery {
    }

    /// Sets the offset for pagination
-    #[allow(dead_code)]
    pub fn offset(mut self, offset: i32) -> Self {
        self.offset = offset;
        self
@@ -2,34 +2,16 @@ use clap::Parser;

 /// Banner Discord Bot - Course availability monitoring
 ///
-/// This application runs multiple services that can be controlled via CLI arguments:
+/// This application runs all services:
 /// - bot: Discord bot for course monitoring commands
 /// - web: HTTP server for web interface and API
 /// - scraper: Background service for scraping course data
-///
-/// Use --services to specify which services to run, or --disable-services to exclude specific services.
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 pub struct Args {
    /// Log formatter to use
    #[arg(long, value_enum, default_value_t = default_tracing_format())]
    pub tracing: TracingFormat,
-
-    /// Services to run (comma-separated). Default: all services
-    ///
-    /// Examples:
-    ///   --services bot,web    # Run only bot and web services
-    ///   --services scraper    # Run only the scraper service
-    #[arg(long, value_delimiter = ',', conflicts_with = "disable_services")]
-    pub services: Option<Vec<ServiceName>>,
-
-    /// Services to disable (comma-separated)
-    ///
-    /// Examples:
-    ///   --disable-services bot        # Run web and scraper only
-    ///   --disable-services bot,web    # Run only the scraper service
-    #[arg(long, value_delimiter = ',', conflicts_with = "services")]
-    pub disable_services: Option<Vec<ServiceName>>,
 }

 #[derive(clap::ValueEnum, Clone, Debug)]
@@ -66,34 +48,6 @@ impl ServiceName {
    }
 }

-/// Determine which services should be enabled based on CLI arguments
-pub fn determine_enabled_services(args: &Args) -> Result<Vec<ServiceName>, anyhow::Error> {
-    match (&args.services, &args.disable_services) {
-        (Some(services), None) => {
-            // User specified which services to run
-            Ok(services.clone())
-        }
-        (None, Some(disabled)) => {
-            // User specified which services to disable
-            let enabled: Vec<ServiceName> = ServiceName::all()
-                .into_iter()
-                .filter(|s| !disabled.contains(s))
-                .collect();
-            Ok(enabled)
-        }
-        (None, None) => {
-            // Default: run all services
-            Ok(ServiceName::all())
-        }
-        (Some(_), Some(_)) => {
-            // This should be prevented by clap's conflicts_with, but just in case
-            Err(anyhow::anyhow!(
-                "Cannot specify both --services and --disable-services"
-            ))
-        }
-    }
-}
-
 #[cfg(debug_assertions)]
 const DEFAULT_TRACING_FORMAT: TracingFormat = TracingFormat::Pretty;
 #[cfg(not(debug_assertions))]
@@ -107,64 +61,6 @@ fn default_tracing_format() -> TracingFormat {
 mod tests {
    use super::*;

-    fn args_with_services(
-        services: Option<Vec<ServiceName>>,
-        disable: Option<Vec<ServiceName>>,
-    ) -> Args {
-        Args {
-            tracing: TracingFormat::Pretty,
-            services,
-            disable_services: disable,
-        }
-    }
-
-    #[test]
-    fn test_default_enables_all_services() {
-        let result = determine_enabled_services(&args_with_services(None, None)).unwrap();
-        assert_eq!(result.len(), 3);
-    }
-
-    #[test]
-    fn test_explicit_services_only_those() {
-        let result =
-            determine_enabled_services(&args_with_services(Some(vec![ServiceName::Web]), None))
-                .unwrap();
-        assert_eq!(result.len(), 1);
-        assert_eq!(result[0].as_str(), "web");
-    }
-
-    #[test]
-    fn test_disable_bot_leaves_web_and_scraper() {
-        let result =
-            determine_enabled_services(&args_with_services(None, Some(vec![ServiceName::Bot])))
-                .unwrap();
-        assert_eq!(result.len(), 2);
-        assert!(result.iter().all(|s| s.as_str() != "bot"));
-    }
-
-    #[test]
-    fn test_disable_all_leaves_empty() {
-        let result = determine_enabled_services(&args_with_services(
-            None,
-            Some(vec![
-                ServiceName::Bot,
-                ServiceName::Web,
-                ServiceName::Scraper,
-            ]),
-        ))
-        .unwrap();
-        assert!(result.is_empty());
-    }
-
-    #[test]
-    fn test_both_specified_returns_error() {
-        let result = determine_enabled_services(&args_with_services(
-            Some(vec![ServiceName::Web]),
-            Some(vec![ServiceName::Bot]),
-        ));
-        assert!(result.is_err());
-    }
-
    #[test]
    fn test_service_name_as_str() {
        assert_eq!(ServiceName::Bot.as_str(), "bot");
@@ -47,6 +47,19 @@ pub struct Config {
    /// Rate limiting configuration for Banner API requests
    #[serde(default = "default_rate_limiting")]
    pub rate_limiting: RateLimitingConfig,
+
+    /// Discord OAuth2 client ID for web authentication
+    #[serde(deserialize_with = "deserialize_string_or_uint")]
+    pub discord_client_id: String,
+    /// Discord OAuth2 client secret for web authentication
+    pub discord_client_secret: String,
+    /// Optional base URL override for OAuth2 redirect (e.g. "https://banner.xevion.dev").
+    /// When unset, the redirect URI is derived from the incoming request's Origin/Host.
+    #[serde(default)]
+    pub discord_redirect_uri: Option<String>,
+    /// Discord user ID to seed as initial admin on startup (optional)
+    #[serde(default)]
+    pub admin_discord_id: Option<u64>,
 }

 /// Default log level of "info"
@@ -216,6 +229,43 @@ where
    deserializer.deserialize_any(DurationVisitor)
 }

+/// Deserializes a value that may arrive as either a string or unsigned integer.
+///
+/// Figment's env provider infers types from raw values, so numeric-looking strings
+/// like Discord client IDs get parsed as integers. This accepts both forms.
+fn deserialize_string_or_uint<'de, D>(deserializer: D) -> Result<String, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    use serde::de::Visitor;
+
+    struct StringOrUintVisitor;
+
+    impl<'de> Visitor<'de> for StringOrUintVisitor {
+        type Value = String;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            formatter.write_str("a string or unsigned integer")
+        }
+
+        fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            Ok(value.to_owned())
+        }
+
+        fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            Ok(value.to_string())
+        }
+    }
+
+    deserializer.deserialize_any(StringOrUintVisitor)
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -1,10 +1,11 @@
 //! Batch database operations for improved performance.

 use crate::banner::Course;
-use crate::data::models::DbMeetingTime;
+use crate::data::models::{DbMeetingTime, UpsertCounts};
 use crate::error::Result;
+use sqlx::PgConnection;
 use sqlx::PgPool;
-use std::collections::HashSet;
+use std::collections::{HashMap, HashSet};
 use std::time::Instant;
 use tracing::info;

@@ -57,46 +58,381 @@ fn extract_campus_code(course: &Course) -> Option<String> {
        .and_then(|mf| mf.meeting_time.campus.clone())
 }

+// ---------------------------------------------------------------------------
+// Task 1: UpsertDiffRow — captures pre- and post-upsert state for diffing
+// ---------------------------------------------------------------------------
+
+/// Row returned by the CTE-based upsert query, carrying both old and new values
+/// for every auditable field. `old_id` is `None` for fresh inserts.
+#[derive(sqlx::FromRow, Debug)]
+struct UpsertDiffRow {
+    id: i32,
+    old_id: Option<i32>,
+
+    // enrollment fields
+    old_enrollment: Option<i32>,
+    new_enrollment: i32,
+    old_max_enrollment: Option<i32>,
+    new_max_enrollment: i32,
+    old_wait_count: Option<i32>,
+    new_wait_count: i32,
+    old_wait_capacity: Option<i32>,
+    new_wait_capacity: i32,
+
+    // text fields (non-nullable in DB)
+    old_subject: Option<String>,
+    new_subject: String,
+    old_course_number: Option<String>,
+    new_course_number: String,
+    old_title: Option<String>,
+    new_title: String,
+
+    // nullable text fields
+    old_sequence_number: Option<String>,
+    new_sequence_number: Option<String>,
+    old_part_of_term: Option<String>,
+    new_part_of_term: Option<String>,
+    old_instructional_method: Option<String>,
+    new_instructional_method: Option<String>,
+    old_campus: Option<String>,
+    new_campus: Option<String>,
+
+    // nullable int fields
+    old_credit_hours: Option<i32>,
+    new_credit_hours: Option<i32>,
+    old_credit_hour_low: Option<i32>,
+    new_credit_hour_low: Option<i32>,
+    old_credit_hour_high: Option<i32>,
+    new_credit_hour_high: Option<i32>,
+
+    // cross-list fields
+    old_cross_list: Option<String>,
+    new_cross_list: Option<String>,
+    old_cross_list_capacity: Option<i32>,
+    new_cross_list_capacity: Option<i32>,
+    old_cross_list_count: Option<i32>,
+    new_cross_list_count: Option<i32>,
+
+    // link fields
+    old_link_identifier: Option<String>,
+    new_link_identifier: Option<String>,
+    old_is_section_linked: Option<bool>,
+    new_is_section_linked: Option<bool>,
+
+    // JSONB fields
+    old_meeting_times: Option<serde_json::Value>,
+    new_meeting_times: serde_json::Value,
+    old_attributes: Option<serde_json::Value>,
+    new_attributes: serde_json::Value,
+}
+
+// ---------------------------------------------------------------------------
+// Task 3: Entry types and diff logic
+// ---------------------------------------------------------------------------
+
+struct AuditEntry {
+    course_id: i32,
+    field_changed: &'static str,
+    old_value: String,
+    new_value: String,
+}
+
+struct MetricEntry {
+    course_id: i32,
+    enrollment: i32,
+    wait_count: i32,
+    seats_available: i32,
+}
+
+/// Compare old vs new for a single field, pushing an `AuditEntry` when they differ.
+///
+/// Three variants:
+/// - `diff_field!(audits, row, field_name, old_field, new_field)` — `Option<T>` old vs `T` new
+/// - `diff_field!(opt audits, row, field_name, old_field, new_field)` — `Option<T>` old vs `Option<T>` new
+/// - `diff_field!(json audits, row, field_name, old_field, new_field)` — `Option<Value>` old vs `Value` new
+///
+/// All variants skip when `old_id` is None (fresh insert).
+macro_rules! diff_field {
+    // Standard: Option<T> old vs T new (non-nullable columns)
+    ($audits:ident, $row:ident, $field:expr, $old:ident, $new:ident) => {
+        if $row.old_id.is_some() {
+            let old_str = $row
+                .$old
+                .as_ref()
+                .map(|v| v.to_string())
+                .unwrap_or_default();
+            let new_str = $row.$new.to_string();
+            if old_str != new_str {
+                $audits.push(AuditEntry {
+                    course_id: $row.id,
+                    field_changed: $field,
+                    old_value: old_str,
+                    new_value: new_str,
+                });
+            }
+        }
+    };
+    // Nullable: Option<T> old vs Option<T> new
+    (opt $audits:ident, $row:ident, $field:expr, $old:ident, $new:ident) => {
+        if $row.old_id.is_some() {
+            let old_str = $row
+                .$old
+                .as_ref()
+                .map(|v| v.to_string())
+                .unwrap_or_default();
+            let new_str = $row
+                .$new
+                .as_ref()
+                .map(|v| v.to_string())
+                .unwrap_or_default();
+            if old_str != new_str {
+                $audits.push(AuditEntry {
+                    course_id: $row.id,
+                    field_changed: $field,
+                    old_value: old_str,
+                    new_value: new_str,
+                });
+            }
+        }
+    };
+    // JSONB: Option<Value> old vs Value new
+    (json $audits:ident, $row:ident, $field:expr, $old:ident, $new:ident) => {
+        if $row.old_id.is_some() {
+            let old_val = $row
+                .$old
+                .as_ref()
+                .cloned()
+                .unwrap_or(serde_json::Value::Null);
+            let new_val = &$row.$new;
+            if old_val != *new_val {
+                $audits.push(AuditEntry {
+                    course_id: $row.id,
+                    field_changed: $field,
+                    old_value: old_val.to_string(),
+                    new_value: new_val.to_string(),
+                });
+            }
+        }
+    };
+}
+
+/// Compute audit entries (field-level diffs) and metric entries from upsert diff rows.
+fn compute_diffs(rows: &[UpsertDiffRow]) -> (Vec<AuditEntry>, Vec<MetricEntry>) {
+    let mut audits = Vec::new();
+    let mut metrics = Vec::new();
+
+    for row in rows {
+        // Non-nullable fields
+        diff_field!(audits, row, "enrollment", old_enrollment, new_enrollment);
+        diff_field!(
+            audits,
+            row,
+            "max_enrollment",
+            old_max_enrollment,
+            new_max_enrollment
+        );
+        diff_field!(audits, row, "wait_count", old_wait_count, new_wait_count);
+        diff_field!(
+            audits,
+            row,
+            "wait_capacity",
+            old_wait_capacity,
+            new_wait_capacity
+        );
+        diff_field!(audits, row, "subject", old_subject, new_subject);
+        diff_field!(
+            audits,
+            row,
+            "course_number",
+            old_course_number,
+            new_course_number
+        );
+        diff_field!(audits, row, "title", old_title, new_title);
+
+        // Nullable text fields
+        diff_field!(opt audits, row, "sequence_number", old_sequence_number, new_sequence_number);
+        diff_field!(opt audits, row, "part_of_term", old_part_of_term, new_part_of_term);
+        diff_field!(opt audits, row, "instructional_method", old_instructional_method, new_instructional_method);
+        diff_field!(opt audits, row, "campus", old_campus, new_campus);
+
+        // Nullable int fields
+        diff_field!(opt audits, row, "credit_hours", old_credit_hours, new_credit_hours);
+        diff_field!(opt audits, row, "credit_hour_low", old_credit_hour_low, new_credit_hour_low);
+        diff_field!(opt audits, row, "credit_hour_high", old_credit_hour_high, new_credit_hour_high);
+
+        // Cross-list fields
+        diff_field!(opt audits, row, "cross_list", old_cross_list, new_cross_list);
+        diff_field!(opt audits, row, "cross_list_capacity", old_cross_list_capacity, new_cross_list_capacity);
+        diff_field!(opt audits, row, "cross_list_count", old_cross_list_count, new_cross_list_count);
+
+        // Link fields
+        diff_field!(opt audits, row, "link_identifier", old_link_identifier, new_link_identifier);
+        diff_field!(opt audits, row, "is_section_linked", old_is_section_linked, new_is_section_linked);
+
+        // JSONB fields
+        diff_field!(json audits, row, "meeting_times", old_meeting_times, new_meeting_times);
+        diff_field!(json audits, row, "attributes", old_attributes, new_attributes);
+
+        // Emit a metric entry when enrollment/wait_count/max_enrollment changed
+        // Skip fresh inserts (no old data to compare against)
+        let enrollment_changed = row.old_id.is_some()
+            && (row.old_enrollment != Some(row.new_enrollment)
+                || row.old_wait_count != Some(row.new_wait_count)
+                || row.old_max_enrollment != Some(row.new_max_enrollment));
+
+        if enrollment_changed {
+            metrics.push(MetricEntry {
+                course_id: row.id,
+                enrollment: row.new_enrollment,
+                wait_count: row.new_wait_count,
+                seats_available: row.new_max_enrollment - row.new_enrollment,
+            });
+        }
+    }
+
+    (audits, metrics)
+}
+
+// ---------------------------------------------------------------------------
+// Task 4: Batch insert functions for audits and metrics
+// ---------------------------------------------------------------------------
+
+async fn insert_audits(audits: &[AuditEntry], conn: &mut PgConnection) -> Result<()> {
+    if audits.is_empty() {
+        return Ok(());
+    }
+
+    let course_ids: Vec<i32> = audits.iter().map(|a| a.course_id).collect();
+    let fields: Vec<&str> = audits.iter().map(|a| a.field_changed).collect();
+    let old_values: Vec<&str> = audits.iter().map(|a| a.old_value.as_str()).collect();
+    let new_values: Vec<&str> = audits.iter().map(|a| a.new_value.as_str()).collect();
+
+    sqlx::query(
+        r#"
+        INSERT INTO course_audits (course_id, timestamp, field_changed, old_value, new_value)
+        SELECT v.course_id, NOW(), v.field_changed, v.old_value, v.new_value
+        FROM UNNEST($1::int4[], $2::text[], $3::text[], $4::text[])
+            AS v(course_id, field_changed, old_value, new_value)
+        "#,
+    )
+    .bind(&course_ids)
+    .bind(&fields)
+    .bind(&old_values)
+    .bind(&new_values)
+    .execute(&mut *conn)
+    .await
+    .map_err(|e| anyhow::anyhow!("Failed to batch insert course_audits: {}", e))?;
+
+    Ok(())
+}
+
+async fn insert_metrics(metrics: &[MetricEntry], conn: &mut PgConnection) -> Result<()> {
+    if metrics.is_empty() {
+        return Ok(());
+    }
+
+    let course_ids: Vec<i32> = metrics.iter().map(|m| m.course_id).collect();
+    let enrollments: Vec<i32> = metrics.iter().map(|m| m.enrollment).collect();
+    let wait_counts: Vec<i32> = metrics.iter().map(|m| m.wait_count).collect();
+    let seats_available: Vec<i32> = metrics.iter().map(|m| m.seats_available).collect();
+
+    sqlx::query(
+        r#"
+        INSERT INTO course_metrics (course_id, timestamp, enrollment, wait_count, seats_available)
+        SELECT v.course_id, NOW(), v.enrollment, v.wait_count, v.seats_available
+        FROM UNNEST($1::int4[], $2::int4[], $3::int4[], $4::int4[])
+            AS v(course_id, enrollment, wait_count, seats_available)
+        "#,
+    )
+    .bind(&course_ids)
+    .bind(&enrollments)
+    .bind(&wait_counts)
+    .bind(&seats_available)
+    .execute(&mut *conn)
+    .await
+    .map_err(|e| anyhow::anyhow!("Failed to batch insert course_metrics: {}", e))?;
+
+    Ok(())
+}
+
+// ---------------------------------------------------------------------------
+// Core upsert functions (updated to use &mut PgConnection)
+// ---------------------------------------------------------------------------
+
 /// Batch upsert courses in a single database query.
 ///
 /// Performs a bulk INSERT...ON CONFLICT DO UPDATE for all courses, including
-/// new fields (meeting times, attributes, instructor data). Returns the
-/// database IDs for all upserted courses (in input order) so instructors
-/// can be linked.
+/// new fields (meeting times, attributes, instructor data). Captures pre-update
+/// state for audit/metric tracking, all within a single transaction.
 ///
 /// # Performance
-/// - Reduces N database round-trips to 3 (courses, instructors, junction)
+/// - Reduces N database round-trips to 5 (old-data CTE + upsert, audits, metrics, instructors, junction)
 /// - Typical usage: 50-200 courses per batch
-pub async fn batch_upsert_courses(courses: &[Course], db_pool: &PgPool) -> Result<()> {
+pub async fn batch_upsert_courses(courses: &[Course], db_pool: &PgPool) -> Result<UpsertCounts> {
    if courses.is_empty() {
        info!("No courses to upsert, skipping batch operation");
-        return Ok(());
+        return Ok(UpsertCounts::default());
    }

    let start = Instant::now();
    let course_count = courses.len();

-    // Step 1: Upsert courses with all fields, returning IDs
-    let course_ids = upsert_courses(courses, db_pool).await?;
+    let mut tx = db_pool.begin().await?;

-    // Step 2: Upsert instructors (deduplicated across batch)
-    upsert_instructors(courses, db_pool).await?;
+    // Step 1: Upsert courses with CTE, returning diff rows
+    let diff_rows = upsert_courses(courses, &mut tx).await?;

-    // Step 3: Link courses to instructors via junction table
-    upsert_course_instructors(courses, &course_ids, db_pool).await?;
+    // Step 2: Extract course IDs for instructor linking
+    let course_ids: Vec<i32> = diff_rows.iter().map(|r| r.id).collect();
+
+    // Step 3: Compute audit/metric diffs
+    let (audits, metrics) = compute_diffs(&diff_rows);
+
+    // Count courses that had at least one field change (existing rows only)
+    let changed_ids: HashSet<i32> = audits.iter().map(|a| a.course_id).collect();
+    let existing_count = diff_rows.iter().filter(|r| r.old_id.is_some()).count() as i32;
+    let courses_changed = changed_ids.len() as i32;
+
+    let counts = UpsertCounts {
+        courses_fetched: course_count as i32,
+        courses_changed,
+        courses_unchanged: existing_count - courses_changed,
+        audits_generated: audits.len() as i32,
+        metrics_generated: metrics.len() as i32,
+    };
+
+    // Step 4: Insert audits and metrics
+    insert_audits(&audits, &mut tx).await?;
+    insert_metrics(&metrics, &mut tx).await?;
+
+    // Step 5: Upsert instructors (returns email -> id map)
+    let email_to_id = upsert_instructors(courses, &mut tx).await?;
+
+    // Step 6: Link courses to instructors via junction table
+    upsert_course_instructors(courses, &course_ids, &email_to_id, &mut tx).await?;
+
+    tx.commit().await?;

    let duration = start.elapsed();
    info!(
        courses_count = course_count,
+        courses_changed = counts.courses_changed,
+        courses_unchanged = counts.courses_unchanged,
+        audit_entries = counts.audits_generated,
+        metric_entries = counts.metrics_generated,
        duration_ms = duration.as_millis(),
-        "Batch upserted courses with instructors"
+        "Batch upserted courses with instructors, audits, and metrics"
    );

-    Ok(())
+    Ok(counts)
 }

-/// Upsert all courses and return their database IDs in input order.
-async fn upsert_courses(courses: &[Course], db_pool: &PgPool) -> Result<Vec<i32>> {
+// ---------------------------------------------------------------------------
+// Task 2: CTE-based upsert returning old+new values
+// ---------------------------------------------------------------------------
+
+/// Upsert all courses and return diff rows with old and new values for auditing.
+async fn upsert_courses(courses: &[Course], conn: &mut PgConnection) -> Result<Vec<UpsertDiffRow>> {
    let crns: Vec<&str> = courses
        .iter()
        .map(|c| c.course_reference_number.as_str())
@@ -143,67 +479,106 @@ async fn upsert_courses(courses: &[Course], db_pool: &PgPool) -> Result<Vec<i32>
        courses.iter().map(to_db_meeting_times).collect();
    let attributes_json: Vec<serde_json::Value> = courses.iter().map(to_db_attributes).collect();

-    let rows = sqlx::query_scalar::<_, i32>(
+    let rows = sqlx::query_as::<_, UpsertDiffRow>(
        r#"
-        INSERT INTO courses (
-            crn, subject, course_number, title, term_code,
-            enrollment, max_enrollment, wait_count, wait_capacity, last_scraped_at,
-            sequence_number, part_of_term, instructional_method, campus,
-            credit_hours, credit_hour_low, credit_hour_high,
-            cross_list, cross_list_capacity, cross_list_count,
-            link_identifier, is_section_linked,
-            meeting_times, attributes
+        WITH old_data AS (
+            SELECT id, enrollment, max_enrollment, wait_count, wait_capacity,
+                   subject, course_number, title,
+                   sequence_number, part_of_term, instructional_method, campus,
+                   credit_hours, credit_hour_low, credit_hour_high,
+                   cross_list, cross_list_capacity, cross_list_count,
+                   link_identifier, is_section_linked,
+                   meeting_times, attributes,
+                   crn, term_code
+            FROM courses
+            WHERE (crn, term_code) IN (SELECT * FROM UNNEST($1::text[], $5::text[]))
+        ),
+        upserted AS (
+            INSERT INTO courses (
+                crn, subject, course_number, title, term_code,
+                enrollment, max_enrollment, wait_count, wait_capacity, last_scraped_at,
+                sequence_number, part_of_term, instructional_method, campus,
+                credit_hours, credit_hour_low, credit_hour_high,
+                cross_list, cross_list_capacity, cross_list_count,
+                link_identifier, is_section_linked,
+                meeting_times, attributes
+            )
+            SELECT
+                v.crn, v.subject, v.course_number, v.title, v.term_code,
+                v.enrollment, v.max_enrollment, v.wait_count, v.wait_capacity, NOW(),
+                v.sequence_number, v.part_of_term, v.instructional_method, v.campus,
+                v.credit_hours, v.credit_hour_low, v.credit_hour_high,
+                v.cross_list, v.cross_list_capacity, v.cross_list_count,
+                v.link_identifier, v.is_section_linked,
+                v.meeting_times, v.attributes
+            FROM UNNEST(
+                $1::text[], $2::text[], $3::text[], $4::text[], $5::text[],
+                $6::int4[], $7::int4[], $8::int4[], $9::int4[],
+                $10::text[], $11::text[], $12::text[], $13::text[],
+                $14::int4[], $15::int4[], $16::int4[],
+                $17::text[], $18::int4[], $19::int4[],
+                $20::text[], $21::bool[],
+                $22::jsonb[], $23::jsonb[]
+            ) AS v(
+                crn, subject, course_number, title, term_code,
+                enrollment, max_enrollment, wait_count, wait_capacity,
+                sequence_number, part_of_term, instructional_method, campus,
+                credit_hours, credit_hour_low, credit_hour_high,
+                cross_list, cross_list_capacity, cross_list_count,
+                link_identifier, is_section_linked,
+                meeting_times, attributes
+            )
+            ON CONFLICT (crn, term_code)
+            DO UPDATE SET
+                subject = EXCLUDED.subject,
+                course_number = EXCLUDED.course_number,
+                title = EXCLUDED.title,
+                enrollment = EXCLUDED.enrollment,
+                max_enrollment = EXCLUDED.max_enrollment,
+                wait_count = EXCLUDED.wait_count,
+                wait_capacity = EXCLUDED.wait_capacity,
+                last_scraped_at = EXCLUDED.last_scraped_at,
+                sequence_number = EXCLUDED.sequence_number,
+                part_of_term = EXCLUDED.part_of_term,
+                instructional_method = EXCLUDED.instructional_method,
+                campus = EXCLUDED.campus,
+                credit_hours = EXCLUDED.credit_hours,
+                credit_hour_low = EXCLUDED.credit_hour_low,
+                credit_hour_high = EXCLUDED.credit_hour_high,
+                cross_list = EXCLUDED.cross_list,
+                cross_list_capacity = EXCLUDED.cross_list_capacity,
+                cross_list_count = EXCLUDED.cross_list_count,
+                link_identifier = EXCLUDED.link_identifier,
+                is_section_linked = EXCLUDED.is_section_linked,
+                meeting_times = EXCLUDED.meeting_times,
+                attributes = EXCLUDED.attributes
+            RETURNING *
        )
-        SELECT
-            v.crn, v.subject, v.course_number, v.title, v.term_code,
-            v.enrollment, v.max_enrollment, v.wait_count, v.wait_capacity, NOW(),
-            v.sequence_number, v.part_of_term, v.instructional_method, v.campus,
-            v.credit_hours, v.credit_hour_low, v.credit_hour_high,
-            v.cross_list, v.cross_list_capacity, v.cross_list_count,
-            v.link_identifier, v.is_section_linked,
-            v.meeting_times, v.attributes
-        FROM UNNEST(
-            $1::text[], $2::text[], $3::text[], $4::text[], $5::text[],
-            $6::int4[], $7::int4[], $8::int4[], $9::int4[],
-            $10::text[], $11::text[], $12::text[], $13::text[],
-            $14::int4[], $15::int4[], $16::int4[],
-            $17::text[], $18::int4[], $19::int4[],
-            $20::text[], $21::bool[],
-            $22::jsonb[], $23::jsonb[]
-        ) AS v(
-            crn, subject, course_number, title, term_code,
-            enrollment, max_enrollment, wait_count, wait_capacity,
-            sequence_number, part_of_term, instructional_method, campus,
-            credit_hours, credit_hour_low, credit_hour_high,
-            cross_list, cross_list_capacity, cross_list_count,
-            link_identifier, is_section_linked,
-            meeting_times, attributes
-        )
-        ON CONFLICT (crn, term_code)
-        DO UPDATE SET
-            subject = EXCLUDED.subject,
-            course_number = EXCLUDED.course_number,
-            title = EXCLUDED.title,
-            enrollment = EXCLUDED.enrollment,
-            max_enrollment = EXCLUDED.max_enrollment,
-            wait_count = EXCLUDED.wait_count,
-            wait_capacity = EXCLUDED.wait_capacity,
-            last_scraped_at = EXCLUDED.last_scraped_at,
-            sequence_number = EXCLUDED.sequence_number,
-            part_of_term = EXCLUDED.part_of_term,
-            instructional_method = EXCLUDED.instructional_method,
-            campus = EXCLUDED.campus,
-            credit_hours = EXCLUDED.credit_hours,
-            credit_hour_low = EXCLUDED.credit_hour_low,
-            credit_hour_high = EXCLUDED.credit_hour_high,
-            cross_list = EXCLUDED.cross_list,
-            cross_list_capacity = EXCLUDED.cross_list_capacity,
-            cross_list_count = EXCLUDED.cross_list_count,
-            link_identifier = EXCLUDED.link_identifier,
-            is_section_linked = EXCLUDED.is_section_linked,
-            meeting_times = EXCLUDED.meeting_times,
-            attributes = EXCLUDED.attributes
-        RETURNING id
+        SELECT u.id,
+               o.id AS old_id,
+               o.enrollment AS old_enrollment, u.enrollment AS new_enrollment,
+               o.max_enrollment AS old_max_enrollment, u.max_enrollment AS new_max_enrollment,
+               o.wait_count AS old_wait_count, u.wait_count AS new_wait_count,
+               o.wait_capacity AS old_wait_capacity, u.wait_capacity AS new_wait_capacity,
+               o.subject AS old_subject, u.subject AS new_subject,
+               o.course_number AS old_course_number, u.course_number AS new_course_number,
+               o.title AS old_title, u.title AS new_title,
+               o.sequence_number AS old_sequence_number, u.sequence_number AS new_sequence_number,
+               o.part_of_term AS old_part_of_term, u.part_of_term AS new_part_of_term,
+               o.instructional_method AS old_instructional_method, u.instructional_method AS new_instructional_method,
+               o.campus AS old_campus, u.campus AS new_campus,
+               o.credit_hours AS old_credit_hours, u.credit_hours AS new_credit_hours,
+               o.credit_hour_low AS old_credit_hour_low, u.credit_hour_low AS new_credit_hour_low,
+               o.credit_hour_high AS old_credit_hour_high, u.credit_hour_high AS new_credit_hour_high,
+               o.cross_list AS old_cross_list, u.cross_list AS new_cross_list,
+               o.cross_list_capacity AS old_cross_list_capacity, u.cross_list_capacity AS new_cross_list_capacity,
+               o.cross_list_count AS old_cross_list_count, u.cross_list_count AS new_cross_list_count,
+               o.link_identifier AS old_link_identifier, u.link_identifier AS new_link_identifier,
+               o.is_section_linked AS old_is_section_linked, u.is_section_linked AS new_is_section_linked,
+               o.meeting_times AS old_meeting_times, u.meeting_times AS new_meeting_times,
+               o.attributes AS old_attributes, u.attributes AS new_attributes
+        FROM upserted u
+        LEFT JOIN old_data o ON u.crn = o.crn AND u.term_code = o.term_code
        "#,
    )
    .bind(&crns)
@@ -229,69 +604,92 @@ async fn upsert_courses(courses: &[Course], db_pool: &PgPool) -> Result<Vec<i32>
    .bind(&is_section_linkeds)
    .bind(&meeting_times_json)
    .bind(&attributes_json)
-    .fetch_all(db_pool)
+    .fetch_all(&mut *conn)
    .await
    .map_err(|e| anyhow::anyhow!("Failed to batch upsert courses: {}", e))?;

    Ok(rows)
 }

-/// Deduplicate and upsert all instructors from the batch.
-async fn upsert_instructors(courses: &[Course], db_pool: &PgPool) -> Result<()> {
+/// Deduplicate and upsert all instructors from the batch by email.
+/// Returns a map of lowercased_email -> instructor id for junction linking.
+async fn upsert_instructors(
+    courses: &[Course],
+    conn: &mut PgConnection,
+) -> Result<HashMap<String, i32>> {
    let mut seen = HashSet::new();
-    let mut banner_ids = Vec::new();
-    let mut display_names = Vec::new();
-    let mut emails: Vec<Option<&str>> = Vec::new();
+    let mut display_names: Vec<&str> = Vec::new();
+    let mut emails_lower: Vec<String> = Vec::new();
+    let mut skipped_no_email = 0u32;

    for course in courses {
        for faculty in &course.faculty {
-            if seen.insert(faculty.banner_id.as_str()) {
-                banner_ids.push(faculty.banner_id.as_str());
-                display_names.push(faculty.display_name.as_str());
-                emails.push(faculty.email_address.as_deref());
+            if let Some(email) = &faculty.email_address {
+                let email_lower = email.to_lowercase();
+                if seen.insert(email_lower.clone()) {
+                    display_names.push(faculty.display_name.as_str());
+                    emails_lower.push(email_lower);
+                }
+            } else {
+                skipped_no_email += 1;
            }
        }
    }

-    if banner_ids.is_empty() {
-        return Ok(());
+    if skipped_no_email > 0 {
+        tracing::warn!(
+            count = skipped_no_email,
+            "Skipped instructors with no email address"
+        );
    }

-    sqlx::query(
+    if display_names.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let email_refs: Vec<&str> = emails_lower.iter().map(|s| s.as_str()).collect();
+
+    let rows: Vec<(i32, String)> = sqlx::query_as(
        r#"
-        INSERT INTO instructors (banner_id, display_name, email)
-        SELECT * FROM UNNEST($1::text[], $2::text[], $3::text[])
-        ON CONFLICT (banner_id)
-        DO UPDATE SET
-            display_name = EXCLUDED.display_name,
-            email = COALESCE(EXCLUDED.email, instructors.email)
+        INSERT INTO instructors (display_name, email)
+        SELECT * FROM UNNEST($1::text[], $2::text[])
+        ON CONFLICT (email)
+        DO UPDATE SET display_name = EXCLUDED.display_name
+        RETURNING id, email
        "#,
    )
-    .bind(&banner_ids)
    .bind(&display_names)
-    .bind(&emails)
-    .execute(db_pool)
+    .bind(&email_refs)
+    .fetch_all(&mut *conn)
    .await
    .map_err(|e| anyhow::anyhow!("Failed to batch upsert instructors: {}", e))?;

-    Ok(())
+    Ok(rows.into_iter().map(|(id, email)| (email, id)).collect())
 }

 /// Link courses to their instructors via the junction table.
 async fn upsert_course_instructors(
    courses: &[Course],
    course_ids: &[i32],
-    db_pool: &PgPool,
+    email_to_id: &HashMap<String, i32>,
+    conn: &mut PgConnection,
 ) -> Result<()> {
    let mut cids = Vec::new();
-    let mut iids = Vec::new();
+    let mut instructor_ids: Vec<i32> = Vec::new();
+    let mut banner_ids: Vec<&str> = Vec::new();
    let mut primaries = Vec::new();

    for (course, &course_id) in courses.iter().zip(course_ids) {
        for faculty in &course.faculty {
-            cids.push(course_id);
-            iids.push(faculty.banner_id.as_str());
-            primaries.push(faculty.primary_indicator);
+            if let Some(email) = &faculty.email_address {
+                let email_lower = email.to_lowercase();
+                if let Some(&instructor_id) = email_to_id.get(&email_lower) {
+                    cids.push(course_id);
+                    instructor_ids.push(instructor_id);
+                    banner_ids.push(faculty.banner_id.as_str());
+                    primaries.push(faculty.primary_indicator);
+                }
+            }
        }
    }

@@ -303,21 +701,24 @@ async fn upsert_course_instructors(
    // This handles instructor changes cleanly.
    sqlx::query("DELETE FROM course_instructors WHERE course_id = ANY($1)")
        .bind(&cids)
-        .execute(db_pool)
+        .execute(&mut *conn)
        .await?;

    sqlx::query(
        r#"
-        INSERT INTO course_instructors (course_id, instructor_id, is_primary)
-        SELECT * FROM UNNEST($1::int4[], $2::text[], $3::bool[])
+        INSERT INTO course_instructors (course_id, instructor_id, banner_id, is_primary)
+        SELECT * FROM UNNEST($1::int4[], $2::int4[], $3::text[], $4::bool[])
        ON CONFLICT (course_id, instructor_id)
-        DO UPDATE SET is_primary = EXCLUDED.is_primary
+        DO UPDATE SET
+            banner_id = EXCLUDED.banner_id,
+            is_primary = EXCLUDED.is_primary
        "#,
    )
    .bind(&cids)
-    .bind(&iids)
+    .bind(&instructor_ids)
+    .bind(&banner_ids)
    .bind(&primaries)
-    .execute(db_pool)
+    .execute(&mut *conn)
    .await
    .map_err(|e| anyhow::anyhow!("Failed to batch upsert course_instructors: {}", e))?;

@@ -1,8 +1,74 @@
 //! Database query functions for courses, used by the web API.

-use crate::data::models::Course;
+use crate::data::models::{Course, CourseInstructorDetail};
 use crate::error::Result;
 use sqlx::PgPool;
+use std::collections::HashMap;
+
+/// Column to sort search results by.
+#[derive(Debug, Clone, Copy, serde::Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SortColumn {
+    CourseCode,
+    Title,
+    Instructor,
+    Time,
+    Seats,
+}
+
+/// Sort direction.
+#[derive(Debug, Clone, Copy, serde::Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SortDirection {
+    Asc,
+    Desc,
+}
+
+/// Shared WHERE clause for course search filters.
+///
+/// Parameters $1-$8 match the bind order in `search_courses`.
+const SEARCH_WHERE: &str = r#"
+    WHERE term_code = $1
+      AND ($2::text[] IS NULL OR subject = ANY($2))
+      AND ($3::text IS NULL OR title_search @@ plainto_tsquery('simple', $3) OR title ILIKE '%' || $3 || '%')
+      AND ($4::int IS NULL OR course_number::int >= $4)
+      AND ($5::int IS NULL OR course_number::int <= $5)
+      AND ($6::bool = false OR max_enrollment > enrollment)
+      AND ($7::text IS NULL OR instructional_method = $7)
+      AND ($8::text IS NULL OR campus = $8)
+"#;
+
+/// Build a safe ORDER BY clause from typed sort parameters.
+///
+/// All column names are hardcoded string literals — no caller input is interpolated.
+fn sort_clause(column: Option<SortColumn>, direction: Option<SortDirection>) -> String {
+    let dir = match direction.unwrap_or(SortDirection::Asc) {
+        SortDirection::Asc => "ASC",
+        SortDirection::Desc => "DESC",
+    };
+
+    match column {
+        Some(SortColumn::CourseCode) => {
+            format!("subject {dir}, course_number {dir}, sequence_number {dir}")
+        }
+        Some(SortColumn::Title) => format!("title {dir}"),
+        Some(SortColumn::Instructor) => {
+            format!(
+                "(SELECT i.display_name FROM course_instructors ci \
+                 JOIN instructors i ON i.id = ci.instructor_id \
+                 WHERE ci.course_id = courses.id AND ci.is_primary = true \
+                 LIMIT 1) {dir} NULLS LAST"
+            )
+        }
+        Some(SortColumn::Time) => {
+            format!("(meeting_times->0->>'begin_time') {dir} NULLS LAST")
+        }
+        Some(SortColumn::Seats) => {
+            format!("(max_enrollment - enrollment) {dir}")
+        }
+        None => "subject ASC, course_number ASC, sequence_number ASC".to_string(),
+    }
+}

 /// Search courses by term with optional filters.
 ///
@@ -12,7 +78,7 @@ use sqlx::PgPool;
 pub async fn search_courses(
    db_pool: &PgPool,
    term_code: &str,
-    subject: Option<&str>,
+    subject: Option<&[String]>,
    title_query: Option<&str>,
    course_number_low: Option<i32>,
    course_number_high: Option<i32>,
@@ -21,32 +87,16 @@ pub async fn search_courses(
    campus: Option<&str>,
    limit: i32,
    offset: i32,
-    order_by: &str,
+    sort_by: Option<SortColumn>,
+    sort_dir: Option<SortDirection>,
 ) -> Result<(Vec<Course>, i64)> {
-    // Build WHERE clauses dynamically via parameter binding + COALESCE trick:
-    // each optional filter uses ($N IS NULL OR column = $N) so NULL means "no filter".
-    //
-    // ORDER BY is interpolated as a string since column names can't be bound as
-    // parameters. The caller must provide a safe, pre-validated clause (see
-    // `sort_clause` in routes.rs).
-    let query = format!(
-        r#"
-        SELECT *
-        FROM courses
-        WHERE term_code = $1
-          AND ($2::text IS NULL OR subject = $2)
-          AND ($3::text IS NULL OR title_search @@ plainto_tsquery('simple', $3) OR title ILIKE '%' || $3 || '%')
-          AND ($4::int IS NULL OR course_number::int >= $4)
-          AND ($5::int IS NULL OR course_number::int <= $5)
-          AND ($6::bool = false OR max_enrollment > enrollment)
-          AND ($7::text IS NULL OR instructional_method = $7)
-          AND ($8::text IS NULL OR campus = $8)
-        ORDER BY {order_by}
-        LIMIT $9 OFFSET $10
-        "#
-    );
+    let order_by = sort_clause(sort_by, sort_dir);

-    let courses = sqlx::query_as::<_, Course>(&query)
+    let data_query =
+        format!("SELECT * FROM courses {SEARCH_WHERE} ORDER BY {order_by} LIMIT $9 OFFSET $10");
+    let count_query = format!("SELECT COUNT(*) FROM courses {SEARCH_WHERE}");
+
+    let courses = sqlx::query_as::<_, Course>(&data_query)
        .bind(term_code)
        .bind(subject)
        .bind(title_query)
@@ -60,30 +110,17 @@ pub async fn search_courses(
        .fetch_all(db_pool)
        .await?;

-    let total: (i64,) = sqlx::query_as(
-        r#"
-        SELECT COUNT(*)
-        FROM courses
-        WHERE term_code = $1
-          AND ($2::text IS NULL OR subject = $2)
-          AND ($3::text IS NULL OR title_search @@ plainto_tsquery('simple', $3) OR title ILIKE '%' || $3 || '%')
-          AND ($4::int IS NULL OR course_number::int >= $4)
-          AND ($5::int IS NULL OR course_number::int <= $5)
-          AND ($6::bool = false OR max_enrollment > enrollment)
-          AND ($7::text IS NULL OR instructional_method = $7)
-          AND ($8::text IS NULL OR campus = $8)
-        "#,
-    )
-    .bind(term_code)
-    .bind(subject)
-    .bind(title_query)
-    .bind(course_number_low)
-    .bind(course_number_high)
-    .bind(open_only)
-    .bind(instructional_method)
-    .bind(campus)
-    .fetch_one(db_pool)
-    .await?;
+    let total: (i64,) = sqlx::query_as(&count_query)
+        .bind(term_code)
+        .bind(subject)
+        .bind(title_query)
+        .bind(course_number_low)
+        .bind(course_number_high)
+        .bind(open_only)
+        .bind(instructional_method)
+        .bind(campus)
+        .fetch_one(db_pool)
+        .await?;

    Ok((courses, total.0))
 }
@@ -103,36 +140,26 @@ pub async fn get_course_by_crn(
    Ok(course)
 }

-/// Get instructors for a course by course ID.
-///
-/// Returns `(banner_id, display_name, email, is_primary, rmp_avg_rating, rmp_num_ratings)` tuples.
+/// Get instructors for a single course by course ID.
 pub async fn get_course_instructors(
    db_pool: &PgPool,
    course_id: i32,
-) -> Result<
-    Vec<(
-        String,
-        String,
-        Option<String>,
-        bool,
-        Option<f32>,
-        Option<i32>,
-    )>,
-> {
-    let rows: Vec<(
-        String,
-        String,
-        Option<String>,
-        bool,
-        Option<f32>,
-        Option<i32>,
-    )> = sqlx::query_as(
+) -> Result<Vec<CourseInstructorDetail>> {
+    let rows = sqlx::query_as::<_, CourseInstructorDetail>(
        r#"
-        SELECT i.banner_id, i.display_name, i.email, ci.is_primary,
-               rp.avg_rating, rp.num_ratings
+        SELECT i.id as instructor_id, ci.banner_id, i.display_name, i.email, ci.is_primary,
+               rmp.avg_rating, rmp.num_ratings, rmp.rmp_legacy_id,
+               ci.course_id
        FROM course_instructors ci
-        JOIN instructors i ON i.banner_id = ci.instructor_id
-        LEFT JOIN rmp_professors rp ON rp.legacy_id = i.rmp_legacy_id
+        JOIN instructors i ON i.id = ci.instructor_id
+        LEFT JOIN LATERAL (
+            SELECT rp.avg_rating, rp.num_ratings, rp.legacy_id as rmp_legacy_id
+            FROM instructor_rmp_links irl
+            JOIN rmp_professors rp ON rp.legacy_id = irl.rmp_legacy_id
+            WHERE irl.instructor_id = i.id
+            ORDER BY rp.num_ratings DESC NULLS LAST, rp.legacy_id ASC
+            LIMIT 1
+        ) rmp ON true
        WHERE ci.course_id = $1
        ORDER BY ci.is_primary DESC, i.display_name
        "#,
@@ -143,6 +170,75 @@ pub async fn get_course_instructors(
    Ok(rows)
 }

+/// Batch-fetch instructors for multiple courses in a single query.
+///
+/// Returns a map of `course_id → Vec<CourseInstructorDetail>`.
+pub async fn get_instructors_for_courses(
+    db_pool: &PgPool,
+    course_ids: &[i32],
+) -> Result<HashMap<i32, Vec<CourseInstructorDetail>>> {
+    if course_ids.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let rows = sqlx::query_as::<_, CourseInstructorDetail>(
+        r#"
+        SELECT i.id as instructor_id, ci.banner_id, i.display_name, i.email, ci.is_primary,
+               rmp.avg_rating, rmp.num_ratings, rmp.rmp_legacy_id,
+               ci.course_id
+        FROM course_instructors ci
+        JOIN instructors i ON i.id = ci.instructor_id
+        LEFT JOIN LATERAL (
+            SELECT rp.avg_rating, rp.num_ratings, rp.legacy_id as rmp_legacy_id
+            FROM instructor_rmp_links irl
+            JOIN rmp_professors rp ON rp.legacy_id = irl.rmp_legacy_id
+            WHERE irl.instructor_id = i.id
+            ORDER BY rp.num_ratings DESC NULLS LAST, rp.legacy_id ASC
+            LIMIT 1
+        ) rmp ON true
+        WHERE ci.course_id = ANY($1)
+        ORDER BY ci.course_id, ci.is_primary DESC, i.display_name
+        "#,
+    )
+    .bind(course_ids)
+    .fetch_all(db_pool)
+    .await?;
+
+    let mut map: HashMap<i32, Vec<CourseInstructorDetail>> = HashMap::new();
+    for row in rows {
+        // course_id is always present in the batch query
+        let cid = row.course_id.unwrap_or_default();
+        map.entry(cid).or_default().push(row);
+    }
+    Ok(map)
+}
+
+/// Get subjects for a term, sorted by total enrollment (descending).
+///
+/// Returns only subjects that have courses in the given term, with their
+/// descriptions from reference_data and enrollment totals for ranking.
+pub async fn get_subjects_by_enrollment(
+    db_pool: &PgPool,
+    term_code: &str,
+) -> Result<Vec<(String, String, i64)>> {
+    let rows: Vec<(String, String, i64)> = sqlx::query_as(
+        r#"
+        SELECT c.subject,
+               COALESCE(rd.description, c.subject),
+               COALESCE(SUM(c.enrollment), 0) as total_enrollment
+        FROM courses c
+        LEFT JOIN reference_data rd ON rd.category = 'subject' AND rd.code = c.subject
+        WHERE c.term_code = $1
+        GROUP BY c.subject, rd.description
+        ORDER BY total_enrollment DESC
+        "#,
+    )
+    .bind(term_code)
+    .fetch_all(db_pool)
+    .await?;
+    Ok(rows)
+}
+
 /// Get all distinct term codes that have courses in the DB.
 pub async fn get_available_terms(db_pool: &PgPool) -> Result<Vec<String>> {
    let rows: Vec<(String,)> =
@@ -5,4 +5,7 @@ pub mod courses;
 pub mod models;
 pub mod reference;
 pub mod rmp;
+pub mod rmp_matching;
 pub mod scrape_jobs;
+pub mod sessions;
+pub mod users;
@@ -1,10 +1,46 @@
 //! `sqlx` models for the database schema.

 use chrono::{DateTime, Utc};
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use serde_json::Value;
 use ts_rs::TS;

+/// Serialize an `i64` as a string to avoid JavaScript precision loss for values exceeding 2^53.
+fn serialize_i64_as_string<S: Serializer>(value: &i64, serializer: S) -> Result<S::Ok, S::Error> {
+    serializer.serialize_str(&value.to_string())
+}
+
+/// Deserialize an `i64` from either a number or a string.
+fn deserialize_i64_from_string<'de, D: Deserializer<'de>>(
+    deserializer: D,
+) -> Result<i64, D::Error> {
+    use serde::de;
+
+    struct I64OrStringVisitor;
+
+    impl<'de> de::Visitor<'de> for I64OrStringVisitor {
+        type Value = i64;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            formatter.write_str("an integer or a string containing an integer")
+        }
+
+        fn visit_i64<E: de::Error>(self, value: i64) -> Result<i64, E> {
+            Ok(value)
+        }
+
+        fn visit_u64<E: de::Error>(self, value: u64) -> Result<i64, E> {
+            i64::try_from(value).map_err(|_| E::custom(format!("u64 {value} out of i64 range")))
+        }
+
+        fn visit_str<E: de::Error>(self, value: &str) -> Result<i64, E> {
+            value.parse().map_err(de::Error::custom)
+        }
+    }
+
+    deserializer.deserialize_any(I64OrStringVisitor)
+}
+
 /// Represents a meeting time stored as JSONB in the courses table.
 #[derive(Debug, Clone, Serialize, Deserialize, TS)]
 #[ts(export)]
@@ -63,19 +99,36 @@ pub struct Course {
 #[allow(dead_code)]
 #[derive(sqlx::FromRow, Debug, Clone)]
 pub struct Instructor {
-    pub banner_id: String,
+    pub id: i32,
    pub display_name: String,
-    pub email: Option<String>,
+    pub email: String,
+    pub rmp_match_status: String,
 }

 #[allow(dead_code)]
 #[derive(sqlx::FromRow, Debug, Clone)]
 pub struct CourseInstructor {
    pub course_id: i32,
-    pub instructor_id: String,
+    pub instructor_id: i32,
+    pub banner_id: String,
    pub is_primary: bool,
 }

+/// Joined instructor data for a course (from course_instructors + instructors + rmp_professors).
+#[derive(sqlx::FromRow, Debug, Clone)]
+pub struct CourseInstructorDetail {
+    pub instructor_id: i32,
+    pub banner_id: String,
+    pub display_name: String,
+    pub email: String,
+    pub is_primary: bool,
+    pub avg_rating: Option<f32>,
+    pub num_ratings: Option<i32>,
+    pub rmp_legacy_id: Option<i32>,
+    /// Present when fetched via batch query; `None` for single-course queries.
+    pub course_id: Option<i32>,
+}
+
 #[allow(dead_code)]
 #[derive(sqlx::FromRow, Debug, Clone)]
 pub struct ReferenceData {
@@ -106,6 +159,16 @@ pub struct CourseAudit {
    pub new_value: String,
 }

+/// Aggregate counts returned by batch upsert, used for scrape job result logging.
+#[derive(Debug, Clone, Default)]
+pub struct UpsertCounts {
+    pub courses_fetched: i32,
+    pub courses_changed: i32,
+    pub courses_unchanged: i32,
+    pub audits_generated: i32,
+    pub metrics_generated: i32,
+}
+
 /// The priority level of a scrape job.
 #[derive(sqlx::Type, Copy, Debug, Clone)]
 #[sqlx(type_name = "scrape_priority", rename_all = "PascalCase")]
@@ -126,6 +189,20 @@ pub enum TargetType {
    SingleCrn,
 }

+/// Computed status for a scrape job, derived from existing fields.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub enum ScrapeJobStatus {
+    Processing,
+    StaleLock,
+    Exhausted,
+    Scheduled,
+    Pending,
+}
+
+/// How long a lock can be held before it is considered stale (mirrors `scrape_jobs::LOCK_EXPIRY`).
+const LOCK_EXPIRY_SECS: i64 = 10 * 60;
+
 /// Represents a queryable job from the database.
 #[allow(dead_code)]
 #[derive(sqlx::FromRow, Debug, Clone)]
@@ -141,4 +218,54 @@ pub struct ScrapeJob {
    pub retry_count: i32,
    /// Maximum number of retry attempts allowed (non-negative, enforced by CHECK constraint)
    pub max_retries: i32,
+    /// When the job last entered the "ready to pick up" state.
+    /// Set to NOW() on creation; updated to NOW() on retry.
+    pub queued_at: DateTime<Utc>,
+}
+
+impl ScrapeJob {
+    /// Compute the current status of this job from its fields.
+    pub fn status(&self) -> ScrapeJobStatus {
+        let now = Utc::now();
+        match self.locked_at {
+            Some(locked) if (now - locked).num_seconds() < LOCK_EXPIRY_SECS => {
+                ScrapeJobStatus::Processing
+            }
+            Some(_) => ScrapeJobStatus::StaleLock,
+            None if self.retry_count >= self.max_retries && self.max_retries > 0 => {
+                ScrapeJobStatus::Exhausted
+            }
+            None if self.execute_at > now => ScrapeJobStatus::Scheduled,
+            None => ScrapeJobStatus::Pending,
+        }
+    }
+}
+
+/// A user authenticated via Discord OAuth.
+#[derive(sqlx::FromRow, Debug, Clone, Serialize, Deserialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct User {
+    #[serde(
+        serialize_with = "serialize_i64_as_string",
+        deserialize_with = "deserialize_i64_from_string"
+    )]
+    #[ts(type = "string")]
+    pub discord_id: i64,
+    pub discord_username: String,
+    pub discord_avatar_hash: Option<String>,
+    pub is_admin: bool,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+/// A server-side session for an authenticated user.
+#[allow(dead_code)] // Fields read via sqlx::FromRow; some only used in DB queries
+#[derive(sqlx::FromRow, Debug, Clone)]
+pub struct UserSession {
+    pub id: String,
+    pub user_id: i64,
+    pub created_at: DateTime<Utc>,
+    pub expires_at: DateTime<Utc>,
+    pub last_active_at: DateTime<Utc>,
 }
@@ -3,8 +3,7 @@
 use crate::error::Result;
 use crate::rmp::RmpProfessor;
 use sqlx::PgPool;
-use std::collections::{HashMap, HashSet};
-use tracing::{debug, info, warn};
+use std::collections::HashSet;

 /// Bulk upsert RMP professors using the UNNEST pattern.
 ///
@@ -93,14 +92,14 @@ pub async fn batch_upsert_rmp_professors(
 }

 /// Normalize a name for matching: lowercase, trim, strip trailing periods.
-fn normalize(s: &str) -> String {
+pub(crate) fn normalize(s: &str) -> String {
    s.trim().to_lowercase().trim_end_matches('.').to_string()
 }

 /// Parse Banner's "Last, First Middle" display name into (last, first) tokens.
 ///
 /// Returns `None` if the format is unparseable (no comma, empty parts).
-fn parse_display_name(display_name: &str) -> Option<(String, String)> {
+pub(crate) fn parse_display_name(display_name: &str) -> Option<(String, String)> {
    let (last_part, first_part) = display_name.split_once(',')?;
    let last = normalize(last_part);
    // Take only the first token of the first-name portion to drop middle names/initials.
@@ -111,128 +110,27 @@ fn parse_display_name(display_name: &str) -> Option<(String, String)> {
    Some((last, first))
 }

-/// Auto-match instructors to RMP professors by normalized name.
+/// Retrieve RMP rating data for an instructor by instructor id.
 ///
-/// Loads all pending instructors and all RMP professors, then matches in Rust
-/// using normalized name comparison. Only assigns a match when exactly one RMP
-/// professor matches a given instructor.
-pub async fn auto_match_instructors(db_pool: &PgPool) -> Result<u64> {
-    // Load pending instructors
-    let instructors: Vec<(String, String)> = sqlx::query_as(
-        "SELECT banner_id, display_name FROM instructors WHERE rmp_match_status = 'pending'",
-    )
-    .fetch_all(db_pool)
-    .await?;
-
-    if instructors.is_empty() {
-        info!(matched = 0, "No pending instructors to match");
-        return Ok(0);
-    }
-
-    // Load all RMP professors
-    let professors: Vec<(i32, String, String)> =
-        sqlx::query_as("SELECT legacy_id, first_name, last_name FROM rmp_professors")
-            .fetch_all(db_pool)
-            .await?;
-
-    // Build a lookup: (normalized_last, normalized_first) -> list of legacy_ids
-    let mut rmp_index: HashMap<(String, String), Vec<i32>> = HashMap::new();
-    for (legacy_id, first, last) in &professors {
-        let key = (normalize(last), normalize(first));
-        rmp_index.entry(key).or_default().push(*legacy_id);
-    }
-
-    // Match each instructor
-    let mut matches: Vec<(i32, String)> = Vec::new(); // (legacy_id, banner_id)
-    let mut no_comma = 0u64;
-    let mut no_match = 0u64;
-    let mut ambiguous = 0u64;
-
-    for (banner_id, display_name) in &instructors {
-        let Some((last, first)) = parse_display_name(display_name) else {
-            no_comma += 1;
-            continue;
-        };
-
-        let key = (last, first);
-        match rmp_index.get(&key) {
-            Some(ids) if ids.len() == 1 => {
-                matches.push((ids[0], banner_id.clone()));
-            }
-            Some(ids) => {
-                ambiguous += 1;
-                debug!(
-                    banner_id,
-                    display_name,
-                    candidates = ids.len(),
-                    "Ambiguous RMP match, skipping"
-                );
-            }
-            None => {
-                no_match += 1;
-            }
-        }
-    }
-
-    if no_comma > 0 || ambiguous > 0 {
-        warn!(
-            total_pending = instructors.len(),
-            no_comma,
-            no_match,
-            ambiguous,
-            matched = matches.len(),
-            "RMP matching diagnostics"
-        );
-    }
-
-    // Batch update matches
-    if matches.is_empty() {
-        info!(matched = 0, "Auto-matched instructors to RMP professors");
-        return Ok(0);
-    }
-
-    let legacy_ids: Vec<i32> = matches.iter().map(|(id, _)| *id).collect();
-    let banner_ids: Vec<&str> = matches.iter().map(|(_, bid)| bid.as_str()).collect();
-
-    let result = sqlx::query(
-        r#"
-        UPDATE instructors i
-        SET
-            rmp_legacy_id = m.legacy_id,
-            rmp_match_status = 'auto'
-        FROM UNNEST($1::int4[], $2::text[]) AS m(legacy_id, banner_id)
-        WHERE i.banner_id = m.banner_id
-        "#,
-    )
-    .bind(&legacy_ids)
-    .bind(&banner_ids)
-    .execute(db_pool)
-    .await
-    .map_err(|e| anyhow::anyhow!("Failed to update instructor RMP matches: {}", e))?;
-
-    let matched = result.rows_affected();
-    info!(matched, "Auto-matched instructors to RMP professors");
-    Ok(matched)
-}
-
-/// Retrieve RMP rating data for an instructor by banner_id.
-///
-/// Returns `(avg_rating, num_ratings)` if the instructor has an RMP match.
+/// Returns `(avg_rating, num_ratings)` for the best linked RMP profile
+/// (most ratings). Returns `None` if no link exists.
 #[allow(dead_code)]
 pub async fn get_instructor_rmp_data(
    db_pool: &PgPool,
-    banner_id: &str,
+    instructor_id: i32,
 ) -> Result<Option<(f32, i32)>> {
    let row: Option<(f32, i32)> = sqlx::query_as(
        r#"
        SELECT rp.avg_rating, rp.num_ratings
-        FROM instructors i
-        JOIN rmp_professors rp ON rp.legacy_id = i.rmp_legacy_id
-        WHERE i.banner_id = $1
+        FROM instructor_rmp_links irl
+        JOIN rmp_professors rp ON rp.legacy_id = irl.rmp_legacy_id
+        WHERE irl.instructor_id = $1
          AND rp.avg_rating IS NOT NULL
+        ORDER BY rp.num_ratings DESC NULLS LAST
+        LIMIT 1
        "#,
    )
-    .bind(banner_id)
+    .bind(instructor_id)
    .fetch_optional(db_pool)
    .await?;
    Ok(row)
@@ -0,0 +1,513 @@
+//! Confidence scoring and candidate generation for RMP instructor matching.
+
+use crate::data::rmp::{normalize, parse_display_name};
+use crate::error::Result;
+use serde::{Deserialize, Serialize};
+use sqlx::PgPool;
+use std::collections::{HashMap, HashSet};
+use tracing::{debug, info};
+
+// ---------------------------------------------------------------------------
+// Scoring types
+// ---------------------------------------------------------------------------
+
+/// Breakdown of individual scoring signals.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct ScoreBreakdown {
+    pub department: f32,
+    pub uniqueness: f32,
+    pub volume: f32,
+}
+
+/// Result of scoring a single instructor–RMP candidate pair.
+#[derive(Debug, Clone)]
+pub struct MatchScore {
+    pub score: f32,
+    pub breakdown: ScoreBreakdown,
+}
+
+// ---------------------------------------------------------------------------
+// Thresholds
+// ---------------------------------------------------------------------------
+
+/// Minimum composite score to store a candidate row.
+const MIN_CANDIDATE_THRESHOLD: f32 = 0.40;
+
+/// Score at or above which a candidate is auto-accepted.
+const AUTO_ACCEPT_THRESHOLD: f32 = 0.85;
+
+// ---------------------------------------------------------------------------
+// Weights
+// ---------------------------------------------------------------------------
+
+const WEIGHT_DEPARTMENT: f32 = 0.50;
+const WEIGHT_UNIQUENESS: f32 = 0.30;
+const WEIGHT_VOLUME: f32 = 0.20;
+
+// ---------------------------------------------------------------------------
+// Pure scoring functions
+// ---------------------------------------------------------------------------
+
+/// Check if an instructor's subjects overlap with an RMP department.
+///
+/// Returns `1.0` for a match, `0.2` for a mismatch, `0.5` when the RMP
+/// department is unknown.
+fn department_similarity(subjects: &[String], rmp_department: Option<&str>) -> f32 {
+    let Some(dept) = rmp_department else {
+        return 0.5;
+    };
+    let dept_lower = dept.to_lowercase();
+
+    // Quick check: does any subject appear directly in the department string
+    // or vice-versa?
+    for subj in subjects {
+        let subj_lower = subj.to_lowercase();
+        if dept_lower.contains(&subj_lower) || subj_lower.contains(&dept_lower) {
+            return 1.0;
+        }
+
+        // Handle common UTSA abbreviation mappings.
+        if matches_known_abbreviation(&subj_lower, &dept_lower) {
+            return 1.0;
+        }
+    }
+
+    0.2
+}
+
+/// Expand common subject abbreviations used at UTSA and check for overlap.
+fn matches_known_abbreviation(subject: &str, department: &str) -> bool {
+    const MAPPINGS: &[(&str, &[&str])] = &[
+        ("cs", &["computer science"]),
+        ("ece", &["electrical", "computer engineering"]),
+        ("ee", &["electrical engineering", "electrical"]),
+        ("me", &["mechanical engineering", "mechanical"]),
+        ("ce", &["civil engineering", "civil"]),
+        ("bio", &["biology", "biological"]),
+        ("chem", &["chemistry"]),
+        ("phys", &["physics"]),
+        ("math", &["mathematics"]),
+        ("sta", &["statistics"]),
+        ("eng", &["english"]),
+        ("his", &["history"]),
+        ("pol", &["political science"]),
+        ("psy", &["psychology"]),
+        ("soc", &["sociology"]),
+        ("mus", &["music"]),
+        ("art", &["art"]),
+        ("phi", &["philosophy"]),
+        ("eco", &["economics"]),
+        ("acc", &["accounting"]),
+        ("fin", &["finance"]),
+        ("mgt", &["management"]),
+        ("mkt", &["marketing"]),
+        ("is", &["information systems"]),
+        ("ms", &["management science"]),
+        ("kin", &["kinesiology"]),
+        ("com", &["communication"]),
+    ];
+
+    for &(abbr, expansions) in MAPPINGS {
+        if subject == abbr {
+            return expansions
+                .iter()
+                .any(|expansion| department.contains(expansion));
+        }
+    }
+    false
+}
+
+/// Compute match confidence score (0.0–1.0) for an instructor–RMP pair.
+///
+/// Name matching is handled by the caller via pre-filtering on exact
+/// normalized `(last, first)`, so only department, uniqueness, and volume
+/// signals are scored here.
+pub fn compute_match_score(
+    instructor_subjects: &[String],
+    rmp_department: Option<&str>,
+    candidate_count: usize,
+    rmp_num_ratings: i32,
+) -> MatchScore {
+    // --- Department (0.50) ---
+    let dept_score = department_similarity(instructor_subjects, rmp_department);
+
+    // --- Uniqueness (0.30) ---
+    let uniqueness_score = match candidate_count {
+        0 | 1 => 1.0,
+        2 => 0.5,
+        _ => 0.2,
+    };
+
+    // --- Volume (0.20) ---
+    let volume_score = ((rmp_num_ratings as f32).ln_1p() / 5.0_f32.ln_1p()).clamp(0.0, 1.0);
+
+    let composite = dept_score * WEIGHT_DEPARTMENT
+        + uniqueness_score * WEIGHT_UNIQUENESS
+        + volume_score * WEIGHT_VOLUME;
+
+    MatchScore {
+        score: composite,
+        breakdown: ScoreBreakdown {
+            department: dept_score,
+            uniqueness: uniqueness_score,
+            volume: volume_score,
+        },
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Candidate generation (DB)
+// ---------------------------------------------------------------------------
+
+/// Statistics returned from candidate generation.
+#[derive(Debug)]
+pub struct MatchingStats {
+    pub total_unmatched: usize,
+    pub candidates_created: usize,
+    pub auto_matched: usize,
+    pub skipped_unparseable: usize,
+    pub skipped_no_candidates: usize,
+}
+
+/// Lightweight row for building the in-memory RMP name index.
+struct RmpProfForMatching {
+    legacy_id: i32,
+    department: Option<String>,
+    num_ratings: i32,
+}
+
+/// Generate match candidates for all unmatched instructors.
+///
+/// For each unmatched instructor:
+/// 1. Parse `display_name` into (last, first).
+/// 2. Find RMP professors with matching normalized name.
+/// 3. Score each candidate.
+/// 4. Store candidates scoring above [`MIN_CANDIDATE_THRESHOLD`].
+/// 5. Auto-accept if the top candidate scores ≥ [`AUTO_ACCEPT_THRESHOLD`]
+///    and no existing rejected candidate exists for that pair.
+///
+/// Already-evaluated instructor–RMP pairs (any status) are skipped.
+pub async fn generate_candidates(db_pool: &PgPool) -> Result<MatchingStats> {
+    // 1. Load unmatched instructors
+    let instructors: Vec<(i32, String)> = sqlx::query_as(
+        "SELECT id, display_name FROM instructors WHERE rmp_match_status = 'unmatched'",
+    )
+    .fetch_all(db_pool)
+    .await?;
+
+    if instructors.is_empty() {
+        info!("No unmatched instructors to generate candidates for");
+        return Ok(MatchingStats {
+            total_unmatched: 0,
+            candidates_created: 0,
+            auto_matched: 0,
+            skipped_unparseable: 0,
+            skipped_no_candidates: 0,
+        });
+    }
+
+    let instructor_ids: Vec<i32> = instructors.iter().map(|(id, _)| *id).collect();
+    let total_unmatched = instructors.len();
+
+    // 2. Load instructor subjects
+    let subject_rows: Vec<(i32, String)> = sqlx::query_as(
+        r#"
+        SELECT DISTINCT ci.instructor_id, c.subject
+        FROM course_instructors ci
+        JOIN courses c ON c.id = ci.course_id
+        WHERE ci.instructor_id = ANY($1)
+        "#,
+    )
+    .bind(&instructor_ids)
+    .fetch_all(db_pool)
+    .await?;
+
+    let mut subject_map: HashMap<i32, Vec<String>> = HashMap::new();
+    for (iid, subject) in subject_rows {
+        subject_map.entry(iid).or_default().push(subject);
+    }
+
+    // 3. Load all RMP professors
+    let prof_rows: Vec<(i32, String, String, Option<String>, i32)> = sqlx::query_as(
+        "SELECT legacy_id, first_name, last_name, department, num_ratings FROM rmp_professors",
+    )
+    .fetch_all(db_pool)
+    .await?;
+
+    // Build name index: (normalized_last, normalized_first) -> Vec<RmpProfForMatching>
+    let mut name_index: HashMap<(String, String), Vec<RmpProfForMatching>> = HashMap::new();
+    for (legacy_id, first_name, last_name, department, num_ratings) in prof_rows {
+        let key = (normalize(&last_name), normalize(&first_name));
+        name_index.entry(key).or_default().push(RmpProfForMatching {
+            legacy_id,
+            department,
+            num_ratings,
+        });
+    }
+
+    // 4. Load existing candidate pairs (and rejected subset) in a single query
+    let candidate_rows: Vec<(i32, i32, String)> =
+        sqlx::query_as("SELECT instructor_id, rmp_legacy_id, status FROM rmp_match_candidates")
+            .fetch_all(db_pool)
+            .await?;
+
+    let mut existing_pairs: HashSet<(i32, i32)> = HashSet::with_capacity(candidate_rows.len());
+    let mut rejected_pairs: HashSet<(i32, i32)> = HashSet::new();
+    for (iid, lid, status) in candidate_rows {
+        existing_pairs.insert((iid, lid));
+        if status == "rejected" {
+            rejected_pairs.insert((iid, lid));
+        }
+    }
+
+    // 5. Score and collect candidates
+    let empty_subjects: Vec<String> = Vec::new();
+    let mut candidates: Vec<(i32, i32, f32, serde_json::Value)> = Vec::new();
+    let mut auto_accept: Vec<(i32, i32)> = Vec::new(); // (instructor_id, legacy_id)
+    let mut skipped_unparseable = 0usize;
+    let mut skipped_no_candidates = 0usize;
+
+    for (instructor_id, display_name) in &instructors {
+        let Some((norm_last, norm_first)) = parse_display_name(display_name) else {
+            skipped_unparseable += 1;
+            debug!(
+                instructor_id,
+                display_name, "Unparseable display name, skipping"
+            );
+            continue;
+        };
+
+        let subjects = subject_map.get(instructor_id).unwrap_or(&empty_subjects);
+
+        let key = (norm_last.clone(), norm_first.clone());
+        let Some(rmp_candidates) = name_index.get(&key) else {
+            skipped_no_candidates += 1;
+            continue;
+        };
+
+        let candidate_count = rmp_candidates.len();
+        let mut best: Option<(f32, i32)> = None;
+
+        for prof in rmp_candidates {
+            let pair = (*instructor_id, prof.legacy_id);
+            if existing_pairs.contains(&pair) {
+                continue;
+            }
+
+            let ms = compute_match_score(
+                subjects,
+                prof.department.as_deref(),
+                candidate_count,
+                prof.num_ratings,
+            );
+
+            if ms.score < MIN_CANDIDATE_THRESHOLD {
+                continue;
+            }
+
+            let breakdown_json =
+                serde_json::to_value(&ms.breakdown).unwrap_or_else(|_| serde_json::json!({}));
+
+            candidates.push((*instructor_id, prof.legacy_id, ms.score, breakdown_json));
+
+            match best {
+                Some((s, _)) if ms.score > s => best = Some((ms.score, prof.legacy_id)),
+                None => best = Some((ms.score, prof.legacy_id)),
+                _ => {}
+            }
+        }
+
+        // Auto-accept the top candidate if it meets the threshold and is not
+        // previously rejected.
+        if let Some((score, legacy_id)) = best
+            && score >= AUTO_ACCEPT_THRESHOLD
+            && !rejected_pairs.contains(&(*instructor_id, legacy_id))
+        {
+            auto_accept.push((*instructor_id, legacy_id));
+        }
+    }
+
+    // 6–7. Write candidates and auto-accept within a single transaction
+    let candidates_created = candidates.len();
+    let auto_matched = auto_accept.len();
+
+    let mut tx = db_pool.begin().await?;
+
+    // 6. Batch-insert candidates
+    if !candidates.is_empty() {
+        let c_instructor_ids: Vec<i32> = candidates.iter().map(|(iid, _, _, _)| *iid).collect();
+        let c_legacy_ids: Vec<i32> = candidates.iter().map(|(_, lid, _, _)| *lid).collect();
+        let c_scores: Vec<f32> = candidates.iter().map(|(_, _, s, _)| *s).collect();
+        let c_breakdowns: Vec<serde_json::Value> =
+            candidates.into_iter().map(|(_, _, _, b)| b).collect();
+
+        sqlx::query(
+            r#"
+            INSERT INTO rmp_match_candidates (instructor_id, rmp_legacy_id, score, score_breakdown)
+            SELECT v.instructor_id, v.rmp_legacy_id, v.score, v.score_breakdown
+            FROM UNNEST($1::int4[], $2::int4[], $3::real[], $4::jsonb[])
+                AS v(instructor_id, rmp_legacy_id, score, score_breakdown)
+            ON CONFLICT (instructor_id, rmp_legacy_id) DO NOTHING
+            "#,
+        )
+        .bind(&c_instructor_ids)
+        .bind(&c_legacy_ids)
+        .bind(&c_scores)
+        .bind(&c_breakdowns)
+        .execute(&mut *tx)
+        .await?;
+    }
+
+    // 7. Auto-accept top candidates
+    if !auto_accept.is_empty() {
+        let aa_instructor_ids: Vec<i32> = auto_accept.iter().map(|(iid, _)| *iid).collect();
+        let aa_legacy_ids: Vec<i32> = auto_accept.iter().map(|(_, lid)| *lid).collect();
+
+        // Mark the candidate row as accepted
+        sqlx::query(
+            r#"
+            UPDATE rmp_match_candidates mc
+            SET status = 'accepted', resolved_at = NOW()
+            FROM UNNEST($1::int4[], $2::int4[]) AS v(instructor_id, rmp_legacy_id)
+            WHERE mc.instructor_id = v.instructor_id
+              AND mc.rmp_legacy_id = v.rmp_legacy_id
+            "#,
+        )
+        .bind(&aa_instructor_ids)
+        .bind(&aa_legacy_ids)
+        .execute(&mut *tx)
+        .await?;
+
+        // Insert links into instructor_rmp_links
+        sqlx::query(
+            r#"
+            INSERT INTO instructor_rmp_links (instructor_id, rmp_legacy_id, source)
+            SELECT v.instructor_id, v.rmp_legacy_id, 'auto'
+            FROM UNNEST($1::int4[], $2::int4[]) AS v(instructor_id, rmp_legacy_id)
+            ON CONFLICT (rmp_legacy_id) DO NOTHING
+            "#,
+        )
+        .bind(&aa_instructor_ids)
+        .bind(&aa_legacy_ids)
+        .execute(&mut *tx)
+        .await?;
+
+        // Update instructor match status
+        sqlx::query(
+            r#"
+            UPDATE instructors i
+            SET rmp_match_status = 'auto'
+            FROM UNNEST($1::int4[]) AS v(instructor_id)
+            WHERE i.id = v.instructor_id
+            "#,
+        )
+        .bind(&aa_instructor_ids)
+        .execute(&mut *tx)
+        .await?;
+    }
+
+    tx.commit().await?;
+
+    let stats = MatchingStats {
+        total_unmatched,
+        candidates_created,
+        auto_matched,
+        skipped_unparseable,
+        skipped_no_candidates,
+    };
+
+    info!(
+        total_unmatched = stats.total_unmatched,
+        candidates_created = stats.candidates_created,
+        auto_matched = stats.auto_matched,
+        skipped_unparseable = stats.skipped_unparseable,
+        skipped_no_candidates = stats.skipped_no_candidates,
+        "Candidate generation complete"
+    );
+
+    Ok(stats)
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_ideal_candidate_high_score() {
+        let ms = compute_match_score(
+            &["CS".to_string()],
+            Some("Computer Science"),
+            1,  // unique candidate
+            50, // decent ratings
+        );
+        // dept 1.0*0.50 + unique 1.0*0.30 + volume ~0.97*0.20 ≈ 0.99
+        assert!(ms.score >= 0.85, "Expected score >= 0.85, got {}", ms.score);
+        assert_eq!(ms.breakdown.uniqueness, 1.0);
+        assert_eq!(ms.breakdown.department, 1.0);
+    }
+
+    #[test]
+    fn test_ambiguous_candidates_lower_score() {
+        let unique = compute_match_score(&[], None, 1, 10);
+        let ambiguous = compute_match_score(&[], None, 3, 10);
+        assert!(
+            unique.score > ambiguous.score,
+            "Unique ({}) should outscore ambiguous ({})",
+            unique.score,
+            ambiguous.score
+        );
+        assert_eq!(unique.breakdown.uniqueness, 1.0);
+        assert_eq!(ambiguous.breakdown.uniqueness, 0.2);
+    }
+
+    #[test]
+    fn test_no_department_neutral() {
+        let ms = compute_match_score(&["CS".to_string()], None, 1, 10);
+        assert_eq!(ms.breakdown.department, 0.5);
+    }
+
+    #[test]
+    fn test_department_match() {
+        let ms = compute_match_score(&["CS".to_string()], Some("Computer Science"), 1, 10);
+        assert_eq!(ms.breakdown.department, 1.0);
+    }
+
+    #[test]
+    fn test_department_mismatch() {
+        let ms = compute_match_score(&["CS".to_string()], Some("History"), 1, 10);
+        assert_eq!(ms.breakdown.department, 0.2);
+    }
+
+    #[test]
+    fn test_department_match_outscores_mismatch() {
+        let matched = compute_match_score(&["CS".to_string()], Some("Computer Science"), 1, 10);
+        let mismatched = compute_match_score(&["CS".to_string()], Some("History"), 1, 10);
+        assert!(
+            matched.score > mismatched.score,
+            "Department match ({}) should outscore mismatch ({})",
+            matched.score,
+            mismatched.score
+        );
+    }
+
+    #[test]
+    fn test_volume_scaling() {
+        let zero = compute_match_score(&[], None, 1, 0);
+        let many = compute_match_score(&[], None, 1, 100);
+        assert!(
+            many.breakdown.volume > zero.breakdown.volume,
+            "100 ratings ({}) should outscore 0 ratings ({})",
+            many.breakdown.volume,
+            zero.breakdown.volume
+        );
+        assert_eq!(zero.breakdown.volume, 0.0);
+        assert!(
+            many.breakdown.volume > 0.9,
+            "100 ratings should be near max"
+        );
+    }
+}
@@ -1,15 +1,40 @@
 //! Database operations for scrape job queue management.

-use crate::data::models::{ScrapeJob, ScrapePriority, TargetType};
+use crate::data::models::{ScrapeJob, ScrapePriority, TargetType, UpsertCounts};
 use crate::error::Result;
+use chrono::{DateTime, Utc};
 use sqlx::PgPool;
 use std::collections::HashSet;

+/// Force-unlock all jobs that have a non-NULL `locked_at`.
+///
+/// Intended to be called once at startup to recover jobs left locked by
+/// a previous unclean shutdown (crash, OOM kill, etc.).
+///
+/// # Returns
+/// The number of jobs that were unlocked.
+pub async fn force_unlock_all(db_pool: &PgPool) -> Result<u64> {
+    let result = sqlx::query(
+        "UPDATE scrape_jobs SET locked_at = NULL, queued_at = NOW() WHERE locked_at IS NOT NULL",
+    )
+    .execute(db_pool)
+    .await?;
+    Ok(result.rows_affected())
+}
+
+/// How long a lock can be held before it is considered expired and reclaimable.
+///
+/// This acts as a safety net for cases where a worker dies without unlocking
+/// (OOM kill, crash, network partition). Under normal operation, the worker's
+/// own job timeout fires well before this threshold.
+const LOCK_EXPIRY: std::time::Duration = std::time::Duration::from_secs(10 * 60);
+
 /// Atomically fetch and lock the next available scrape job.
 ///
 /// Uses `FOR UPDATE SKIP LOCKED` to allow multiple workers to poll the queue
-/// concurrently without conflicts. Only jobs that are unlocked and ready to
-/// execute (based on `execute_at`) are considered.
+/// concurrently without conflicts. Considers jobs that are:
+/// - Unlocked and ready to execute, OR
+/// - Locked but past [`LOCK_EXPIRY`] (abandoned by a dead worker)
 ///
 /// # Arguments
 /// * `db_pool` - PostgreSQL connection pool
@@ -20,9 +45,16 @@ use std::collections::HashSet;
 pub async fn fetch_and_lock_job(db_pool: &PgPool) -> Result<Option<ScrapeJob>> {
    let mut tx = db_pool.begin().await?;

+    let lock_expiry_secs = LOCK_EXPIRY.as_secs() as i32;
    let job = sqlx::query_as::<_, ScrapeJob>(
-        "SELECT * FROM scrape_jobs WHERE locked_at IS NULL AND execute_at <= NOW() ORDER BY priority DESC, execute_at ASC LIMIT 1 FOR UPDATE SKIP LOCKED"
+        "SELECT * FROM scrape_jobs \
+         WHERE (locked_at IS NULL OR locked_at < NOW() - make_interval(secs => $1::double precision)) \
+         AND execute_at <= NOW() \
+         ORDER BY priority DESC, execute_at ASC \
+         LIMIT 1 \
+         FOR UPDATE SKIP LOCKED"
    )
+    .bind(lock_expiry_secs)
    .fetch_optional(&mut *tx)
    .await?;

@@ -68,10 +100,11 @@ pub async fn unlock_job(job_id: i32, db_pool: &PgPool) -> Result<()> {
    Ok(())
 }

-/// Atomically unlock a job and increment its retry count.
+/// Atomically unlock a job, increment its retry count, and reset `queued_at`.
 ///
-/// Returns whether the job still has retries remaining. This is determined
-/// atomically in the database to avoid race conditions between workers.
+/// Returns the new `queued_at` timestamp if retries remain, or `None` if
+/// the job has exhausted its retries. This is determined atomically in the
+/// database to avoid race conditions between workers.
 ///
 /// # Arguments
 /// * `job_id` - The database ID of the job
@@ -79,31 +112,31 @@ pub async fn unlock_job(job_id: i32, db_pool: &PgPool) -> Result<()> {
 /// * `db_pool` - PostgreSQL connection pool
 ///
 /// # Returns
-/// * `Ok(true)` if the job was unlocked and retries remain
-/// * `Ok(false)` if the job has exhausted its retries
+/// * `Ok(Some(queued_at))` if the job was unlocked and retries remain
+/// * `Ok(None)` if the job has exhausted its retries
 pub async fn unlock_and_increment_retry(
    job_id: i32,
    max_retries: i32,
    db_pool: &PgPool,
-) -> Result<bool> {
-    let result = sqlx::query_scalar::<_, Option<i32>>(
+) -> Result<Option<chrono::DateTime<chrono::Utc>>> {
+    let result = sqlx::query_scalar::<_, Option<chrono::DateTime<chrono::Utc>>>(
        "UPDATE scrape_jobs
-         SET locked_at = NULL, retry_count = retry_count + 1
+         SET locked_at = NULL, retry_count = retry_count + 1, queued_at = NOW()
         WHERE id = $1
-         RETURNING CASE WHEN retry_count < $2 THEN retry_count ELSE NULL END",
+         RETURNING CASE WHEN retry_count <= $2 THEN queued_at ELSE NULL END",
    )
    .bind(job_id)
    .bind(max_retries)
    .fetch_one(db_pool)
    .await?;

-    Ok(result.is_some())
+    Ok(result)
 }

-/// Find existing unlocked job payloads matching the given target type and candidates.
+/// Find existing job payloads matching the given target type and candidates.
 ///
-/// Returns a set of stringified JSON payloads that already exist in the queue,
-/// used for deduplication when scheduling new jobs.
+/// Returns a set of stringified JSON payloads that already exist in the queue
+/// (both locked and unlocked), used for deduplication when scheduling new jobs.
 ///
 /// # Arguments
 /// * `target_type` - The target type to filter by
@@ -111,7 +144,7 @@ pub async fn unlock_and_increment_retry(
 /// * `db_pool` - PostgreSQL connection pool
 ///
 /// # Returns
-/// A `HashSet` of stringified JSON payloads that already have pending jobs
+/// A `HashSet` of stringified JSON payloads that already have pending or in-progress jobs
 pub async fn find_existing_job_payloads(
    target_type: TargetType,
    candidate_payloads: &[serde_json::Value],
@@ -119,7 +152,7 @@ pub async fn find_existing_job_payloads(
 ) -> Result<HashSet<String>> {
    let existing_jobs: Vec<(serde_json::Value,)> = sqlx::query_as(
        "SELECT target_payload FROM scrape_jobs
-         WHERE target_type = $1 AND target_payload = ANY($2) AND locked_at IS NULL",
+         WHERE target_type = $1 AND target_payload = ANY($2)",
    )
    .bind(target_type)
    .bind(candidate_payloads)
@@ -134,7 +167,53 @@ pub async fn find_existing_job_payloads(
    Ok(existing_payloads)
 }

-/// Batch insert scrape jobs in a single transaction.
+/// Insert a scrape job result log entry.
+#[allow(clippy::too_many_arguments)]
+pub async fn insert_job_result(
+    target_type: TargetType,
+    payload: serde_json::Value,
+    priority: ScrapePriority,
+    queued_at: DateTime<Utc>,
+    started_at: DateTime<Utc>,
+    duration_ms: i32,
+    success: bool,
+    error_message: Option<&str>,
+    retry_count: i32,
+    counts: Option<&UpsertCounts>,
+    db_pool: &PgPool,
+) -> Result<()> {
+    sqlx::query(
+        r#"
+        INSERT INTO scrape_job_results (
+            target_type, payload, priority,
+            queued_at, started_at, duration_ms,
+            success, error_message, retry_count,
+            courses_fetched, courses_changed, courses_unchanged,
+            audits_generated, metrics_generated
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)
+        "#,
+    )
+    .bind(target_type)
+    .bind(&payload)
+    .bind(priority)
+    .bind(queued_at)
+    .bind(started_at)
+    .bind(duration_ms)
+    .bind(success)
+    .bind(error_message)
+    .bind(retry_count)
+    .bind(counts.map(|c| c.courses_fetched))
+    .bind(counts.map(|c| c.courses_changed))
+    .bind(counts.map(|c| c.courses_unchanged))
+    .bind(counts.map(|c| c.audits_generated))
+    .bind(counts.map(|c| c.metrics_generated))
+    .execute(db_pool)
+    .await?;
+
+    Ok(())
+}
+
+/// Batch insert scrape jobs using UNNEST for a single round-trip.
 ///
 /// All jobs are inserted with `execute_at` set to the current time.
 ///
@@ -144,27 +223,35 @@ pub async fn find_existing_job_payloads(
 pub async fn batch_insert_jobs(
    jobs: &[(serde_json::Value, TargetType, ScrapePriority)],
    db_pool: &PgPool,
-) -> Result<()> {
+) -> Result<Vec<ScrapeJob>> {
    if jobs.is_empty() {
-        return Ok(());
+        return Ok(Vec::new());
    }

-    let now = chrono::Utc::now();
-    let mut tx = db_pool.begin().await?;
+    let mut target_types: Vec<String> = Vec::with_capacity(jobs.len());
+    let mut payloads: Vec<serde_json::Value> = Vec::with_capacity(jobs.len());
+    let mut priorities: Vec<String> = Vec::with_capacity(jobs.len());

    for (payload, target_type, priority) in jobs {
-        sqlx::query(
-            "INSERT INTO scrape_jobs (target_type, target_payload, priority, execute_at) VALUES ($1, $2, $3, $4)"
-        )
-        .bind(target_type)
-        .bind(payload)
-        .bind(priority)
-        .bind(now)
-        .execute(&mut *tx)
-        .await?;
+        target_types.push(format!("{target_type:?}"));
+        payloads.push(payload.clone());
+        priorities.push(format!("{priority:?}"));
    }

-    tx.commit().await?;
+    let inserted = sqlx::query_as::<_, ScrapeJob>(
+        r#"
+        INSERT INTO scrape_jobs (target_type, target_payload, priority, execute_at, queued_at)
+        SELECT v.target_type::target_type, v.payload, v.priority::scrape_priority, NOW(), NOW()
+        FROM UNNEST($1::text[], $2::jsonb[], $3::text[])
+            AS v(target_type, payload, priority)
+        RETURNING *
+        "#,
+    )
+    .bind(&target_types)
+    .bind(&payloads)
+    .bind(&priorities)
+    .fetch_all(db_pool)
+    .await?;

-    Ok(())
+    Ok(inserted)
 }
@@ -0,0 +1,90 @@
+//! Database query functions for user sessions.
+
+use anyhow::Context;
+use rand::Rng;
+use sqlx::PgPool;
+
+use super::models::UserSession;
+use crate::error::Result;
+
+/// Generate a cryptographically random 32-byte hex token.
+fn generate_token() -> String {
+    let bytes: [u8; 32] = rand::rng().random();
+    bytes.iter().map(|b| format!("{b:02x}")).collect()
+}
+
+/// Create a new session for a user with the given duration.
+pub async fn create_session(
+    pool: &PgPool,
+    user_id: i64,
+    duration: std::time::Duration,
+) -> Result<UserSession> {
+    let token = generate_token();
+    let duration_secs = duration.as_secs() as i64;
+
+    sqlx::query_as::<_, UserSession>(
+        r#"
+        INSERT INTO user_sessions (id, user_id, expires_at)
+        VALUES ($1, $2, now() + make_interval(secs => $3::double precision))
+        RETURNING *
+        "#,
+    )
+    .bind(&token)
+    .bind(user_id)
+    .bind(duration_secs as f64)
+    .fetch_one(pool)
+    .await
+    .context("failed to create session")
+}
+
+/// Fetch a session by token, only if it has not expired.
+pub async fn get_session(pool: &PgPool, token: &str) -> Result<Option<UserSession>> {
+    sqlx::query_as::<_, UserSession>(
+        "SELECT * FROM user_sessions WHERE id = $1 AND expires_at > now()",
+    )
+    .bind(token)
+    .fetch_optional(pool)
+    .await
+    .context("failed to get session")
+}
+
+/// Update the last-active timestamp for a session.
+pub async fn touch_session(pool: &PgPool, token: &str) -> Result<()> {
+    sqlx::query("UPDATE user_sessions SET last_active_at = now() WHERE id = $1")
+        .bind(token)
+        .execute(pool)
+        .await
+        .context("failed to touch session")?;
+    Ok(())
+}
+
+/// Delete a session by token.
+pub async fn delete_session(pool: &PgPool, token: &str) -> Result<()> {
+    sqlx::query("DELETE FROM user_sessions WHERE id = $1")
+        .bind(token)
+        .execute(pool)
+        .await
+        .context("failed to delete session")?;
+    Ok(())
+}
+
+/// Delete all sessions for a user. Returns the number of sessions deleted.
+#[allow(dead_code)] // Available for admin user-deletion flow
+pub async fn delete_user_sessions(pool: &PgPool, user_id: i64) -> Result<u64> {
+    let result = sqlx::query("DELETE FROM user_sessions WHERE user_id = $1")
+        .bind(user_id)
+        .execute(pool)
+        .await
+        .context("failed to delete user sessions")?;
+    Ok(result.rows_affected())
+}
+
+/// Delete all expired sessions. Returns the number of sessions cleaned up.
+#[allow(dead_code)] // Called by SessionCache::cleanup_expired (not yet wired to periodic task)
+pub async fn cleanup_expired(pool: &PgPool) -> Result<u64> {
+    let result = sqlx::query("DELETE FROM user_sessions WHERE expires_at <= now()")
+        .execute(pool)
+        .await
+        .context("failed to cleanup expired sessions")?;
+    Ok(result.rows_affected())
+}
@@ -0,0 +1,86 @@
+//! Database query functions for users.
+
+use anyhow::Context;
+use sqlx::PgPool;
+
+use super::models::User;
+use crate::error::Result;
+
+/// Insert a new user or update username/avatar on conflict.
+pub async fn upsert_user(
+    pool: &PgPool,
+    discord_id: i64,
+    username: &str,
+    avatar_hash: Option<&str>,
+) -> Result<User> {
+    sqlx::query_as::<_, User>(
+        r#"
+        INSERT INTO users (discord_id, discord_username, discord_avatar_hash)
+        VALUES ($1, $2, $3)
+        ON CONFLICT (discord_id) DO UPDATE
+            SET discord_username = EXCLUDED.discord_username,
+                discord_avatar_hash = EXCLUDED.discord_avatar_hash,
+                updated_at = now()
+        RETURNING *
+        "#,
+    )
+    .bind(discord_id)
+    .bind(username)
+    .bind(avatar_hash)
+    .fetch_one(pool)
+    .await
+    .context("failed to upsert user")
+}
+
+/// Fetch a user by Discord ID.
+pub async fn get_user(pool: &PgPool, discord_id: i64) -> Result<Option<User>> {
+    sqlx::query_as::<_, User>("SELECT * FROM users WHERE discord_id = $1")
+        .bind(discord_id)
+        .fetch_optional(pool)
+        .await
+        .context("failed to get user")
+}
+
+/// List all users ordered by creation date (newest first).
+pub async fn list_users(pool: &PgPool) -> Result<Vec<User>> {
+    sqlx::query_as::<_, User>("SELECT * FROM users ORDER BY created_at DESC")
+        .fetch_all(pool)
+        .await
+        .context("failed to list users")
+}
+
+/// Set the admin flag for a user, returning the updated user if found.
+pub async fn set_admin(pool: &PgPool, discord_id: i64, is_admin: bool) -> Result<Option<User>> {
+    sqlx::query_as::<_, User>(
+        r#"
+        UPDATE users
+        SET is_admin = $2, updated_at = now()
+        WHERE discord_id = $1
+        RETURNING *
+        "#,
+    )
+    .bind(discord_id)
+    .bind(is_admin)
+    .fetch_optional(pool)
+    .await
+    .context("failed to set admin status")
+}
+
+/// Ensure a seed admin exists. Upserts with `is_admin = true` and a placeholder
+/// username that will be replaced on first OAuth login.
+pub async fn ensure_seed_admin(pool: &PgPool, discord_id: i64) -> Result<User> {
+    sqlx::query_as::<_, User>(
+        r#"
+        INSERT INTO users (discord_id, discord_username, is_admin)
+        VALUES ($1, 'seed-admin', true)
+        ON CONFLICT (discord_id) DO UPDATE
+            SET is_admin = true,
+                updated_at = now()
+        RETURNING *
+        "#,
+    )
+    .bind(discord_id)
+    .fetch_one(pool)
+    .await
+    .context("failed to ensure seed admin")
+}
@@ -1,5 +1,5 @@
 use crate::app::App;
-use crate::cli::{Args, ServiceName, determine_enabled_services};
+use crate::cli::{Args, ServiceName};
 use crate::logging::setup_logging;
 use clap::Parser;
 use std::process::ExitCode;
@@ -19,7 +19,6 @@ mod scraper;
 mod services;
 mod signals;
 mod state;
-#[allow(dead_code)]
 mod status;
 mod web;

@@ -30,9 +29,8 @@ async fn main() -> ExitCode {
    // Parse CLI arguments
    let args = Args::parse();

-    // Determine which services should be enabled
-    let enabled_services: Vec<ServiceName> =
-        determine_enabled_services(&args).expect("Failed to determine enabled services");
+    // Always run all services
+    let enabled_services = ServiceName::all();

    // Create and initialize the application
    let mut app = App::new().await.expect("Failed to initialize application");
@@ -35,6 +35,12 @@ pub struct RmpClient {
    http: reqwest::Client,
 }

+impl Default for RmpClient {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RmpClient {
    pub fn new() -> Self {
        Self {
@@ -1,7 +1,7 @@
 pub mod subject;

 use crate::banner::BannerApi;
-use crate::data::models::TargetType;
+use crate::data::models::{TargetType, UpsertCounts};
 use crate::error::Result;
 use serde::{Deserialize, Serialize};
 use sqlx::PgPool;
@@ -32,8 +32,9 @@ pub trait Job: Send + Sync {
    #[allow(dead_code)]
    fn target_type(&self) -> TargetType;

-    /// Process the job with the given API client and database pool
-    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<()>;
+    /// Process the job with the given API client and database pool.
+    /// Returns upsert effectiveness counts on success.
+    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<UpsertCounts>;

    /// Get a human-readable description of the job
    fn description(&self) -> String;
@@ -1,7 +1,7 @@
 use super::Job;
 use crate::banner::{BannerApi, SearchQuery, Term};
 use crate::data::batch::batch_upsert_courses;
-use crate::data::models::TargetType;
+use crate::data::models::{TargetType, UpsertCounts};
 use crate::error::Result;
 use serde::{Deserialize, Serialize};
 use sqlx::PgPool;
@@ -26,7 +26,7 @@ impl Job for SubjectJob {
    }

    #[tracing::instrument(skip(self, banner_api, db_pool), fields(subject = %self.subject))]
-    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<()> {
+    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<UpsertCounts> {
        let subject_code = &self.subject;

        // Get the current term
@@ -37,17 +37,19 @@ impl Job for SubjectJob {
            .search(&term, &query, "subjectDescription", false)
            .await?;

-        if let Some(courses_from_api) = search_result.data {
+        let counts = if let Some(courses_from_api) = search_result.data {
            info!(
                subject = %subject_code,
                count = courses_from_api.len(),
                "Found courses"
            );
-            batch_upsert_courses(&courses_from_api, db_pool).await?;
-        }
+            batch_upsert_courses(&courses_from_api, db_pool).await?
+        } else {
+            UpsertCounts::default()
+        };

        debug!(subject = %subject_code, "Subject job completed");
-        Ok(())
+        Ok(counts)
    }

    fn description(&self) -> String {
@@ -3,9 +3,11 @@ pub mod scheduler;
 pub mod worker;

 use crate::banner::BannerApi;
+use crate::data::scrape_jobs;
 use crate::services::Service;
 use crate::state::ReferenceCache;
 use crate::status::{ServiceStatus, ServiceStatusRegistry};
+use crate::web::ws::ScrapeJobEvent;
 use sqlx::PgPool;
 use std::sync::Arc;
 use tokio::sync::{RwLock, broadcast};
@@ -24,6 +26,7 @@ pub struct ScraperService {
    banner_api: Arc<BannerApi>,
    reference_cache: Arc<RwLock<ReferenceCache>>,
    service_statuses: ServiceStatusRegistry,
+    job_events_tx: broadcast::Sender<ScrapeJobEvent>,
    scheduler_handle: Option<JoinHandle<()>>,
    worker_handles: Vec<JoinHandle<()>>,
    shutdown_tx: Option<broadcast::Sender<()>>,
@@ -36,12 +39,14 @@ impl ScraperService {
        banner_api: Arc<BannerApi>,
        reference_cache: Arc<RwLock<ReferenceCache>>,
        service_statuses: ServiceStatusRegistry,
+        job_events_tx: broadcast::Sender<ScrapeJobEvent>,
    ) -> Self {
        Self {
            db_pool,
            banner_api,
            reference_cache,
            service_statuses,
+            job_events_tx,
            scheduler_handle: None,
            worker_handles: Vec::new(),
            shutdown_tx: None,
@@ -49,7 +54,17 @@ impl ScraperService {
    }

    /// Starts the scheduler and a pool of workers.
-    pub fn start(&mut self) {
+    ///
+    /// Force-unlocks any jobs left locked by a previous unclean shutdown before
+    /// spawning workers, so those jobs re-enter the queue immediately.
+    pub async fn start(&mut self) {
+        // Recover jobs left locked by a previous crash/unclean shutdown
+        match scrape_jobs::force_unlock_all(&self.db_pool).await {
+            Ok(0) => {}
+            Ok(count) => warn!(count, "Force-unlocked stale jobs from previous run"),
+            Err(e) => warn!(error = ?e, "Failed to force-unlock stale jobs"),
+        }
+
        info!("ScraperService starting");

        // Create shutdown channel
@@ -60,6 +75,7 @@ impl ScraperService {
            self.db_pool.clone(),
            self.banner_api.clone(),
            self.reference_cache.clone(),
+            self.job_events_tx.clone(),
        );
        let shutdown_rx = shutdown_tx.subscribe();
        let scheduler_handle = tokio::spawn(async move {
@@ -70,7 +86,12 @@ impl ScraperService {

        let worker_count = 4; // This could be configurable
        for i in 0..worker_count {
-            let worker = Worker::new(i, self.db_pool.clone(), self.banner_api.clone());
+            let worker = Worker::new(
+                i,
+                self.db_pool.clone(),
+                self.banner_api.clone(),
+                self.job_events_tx.clone(),
+            );
            let shutdown_rx = shutdown_tx.subscribe();
            let worker_handle = tokio::spawn(async move {
                worker.run(shutdown_rx).await;
@@ -92,7 +113,7 @@ impl Service for ScraperService {
    }

    async fn run(&mut self) -> Result<(), anyhow::Error> {
-        self.start();
+        self.start().await;
        std::future::pending::<()>().await;
        Ok(())
    }
@@ -5,6 +5,7 @@ use crate::error::Result;
 use crate::rmp::RmpClient;
 use crate::scraper::jobs::subject::SubjectJob;
 use crate::state::ReferenceCache;
+use crate::web::ws::{ScrapeJobDto, ScrapeJobEvent};
 use serde_json::json;
 use sqlx::PgPool;
 use std::sync::Arc;
@@ -25,6 +26,7 @@ pub struct Scheduler {
    db_pool: PgPool,
    banner_api: Arc<BannerApi>,
    reference_cache: Arc<RwLock<ReferenceCache>>,
+    job_events_tx: broadcast::Sender<ScrapeJobEvent>,
 }

 impl Scheduler {
@@ -32,11 +34,13 @@ impl Scheduler {
        db_pool: PgPool,
        banner_api: Arc<BannerApi>,
        reference_cache: Arc<RwLock<ReferenceCache>>,
+        job_events_tx: broadcast::Sender<ScrapeJobEvent>,
    ) -> Self {
        Self {
            db_pool,
            banner_api,
            reference_cache,
+            job_events_tx,
        }
    }

@@ -74,6 +78,7 @@ impl Scheduler {
                        let banner_api = self.banner_api.clone();
                        let cancel_token = cancel_token.clone();
                        let reference_cache = self.reference_cache.clone();
+                        let job_events_tx = self.job_events_tx.clone();

                                async move {
                                    tokio::select! {
@@ -99,7 +104,7 @@ impl Scheduler {

                                            tokio::join!(rmp_fut, ref_fut);

-                                            if let Err(e) = Self::schedule_jobs_impl(&db_pool, &banner_api).await {
+                                            if let Err(e) = Self::schedule_jobs_impl(&db_pool, &banner_api, Some(&job_events_tx)).await {
                                                error!(error = ?e, "Failed to schedule jobs");
                                            }
                                        } => {}
@@ -150,7 +155,11 @@ impl Scheduler {
    ///
    /// This is a static method (not &self) to allow it to be called from spawned tasks.
    #[tracing::instrument(skip_all, fields(term))]
-    async fn schedule_jobs_impl(db_pool: &PgPool, banner_api: &BannerApi) -> Result<()> {
+    async fn schedule_jobs_impl(
+        db_pool: &PgPool,
+        banner_api: &BannerApi,
+        job_events_tx: Option<&broadcast::Sender<ScrapeJobEvent>>,
+    ) -> Result<()> {
        // For now, we will implement a simple baseline scheduling strategy:
        // 1. Get a list of all subjects from the Banner API.
        // 2. Query existing jobs for all subjects in a single query.
@@ -213,7 +222,16 @@ impl Scheduler {
                .map(|(payload, _)| (payload, TargetType::Subject, ScrapePriority::Low))
                .collect();

-            scrape_jobs::batch_insert_jobs(&jobs, db_pool).await?;
+            let inserted = scrape_jobs::batch_insert_jobs(&jobs, db_pool).await?;
+
+            if let Some(tx) = job_events_tx {
+                inserted.iter().for_each(|job| {
+                    debug!(job_id = job.id, "Emitting JobCreated event");
+                    let _ = tx.send(ScrapeJobEvent::JobCreated {
+                        job: ScrapeJobDto::from(job),
+                    });
+                });
+            }
        }

        debug!("Job scheduling complete");
@@ -232,8 +250,16 @@ impl Scheduler {
        crate::data::rmp::batch_upsert_rmp_professors(&professors, db_pool).await?;
        info!(total, "RMP professors upserted");

-        let matched = crate::data::rmp::auto_match_instructors(db_pool).await?;
-        info!(total, matched, "RMP sync complete");
+        let stats = crate::data::rmp_matching::generate_candidates(db_pool).await?;
+        info!(
+            total,
+            stats.total_unmatched,
+            stats.candidates_created,
+            stats.auto_matched,
+            stats.skipped_unparseable,
+            stats.skipped_no_candidates,
+            "RMP sync complete"
+        );

        Ok(())
    }
@@ -1,8 +1,10 @@
 use crate::banner::{BannerApi, BannerApiError};
-use crate::data::models::ScrapeJob;
+use crate::data::models::{ScrapeJob, ScrapeJobStatus, UpsertCounts};
 use crate::data::scrape_jobs;
 use crate::error::Result;
 use crate::scraper::jobs::{JobError, JobType};
+use crate::web::ws::ScrapeJobEvent;
+use chrono::{DateTime, Utc};
 use sqlx::PgPool;
 use std::sync::Arc;
 use std::time::Duration;
@@ -10,6 +12,9 @@ use tokio::sync::broadcast;
 use tokio::time;
 use tracing::{Instrument, debug, error, info, trace, warn};

+/// Maximum time a single job is allowed to run before being considered stuck.
+const JOB_TIMEOUT: Duration = Duration::from_secs(5 * 60);
+
 /// A single worker instance.
 ///
 /// Each worker runs in its own asynchronous task and continuously polls the
@@ -18,14 +23,21 @@ pub struct Worker {
    id: usize, // For logging purposes
    db_pool: PgPool,
    banner_api: Arc<BannerApi>,
+    job_events_tx: broadcast::Sender<ScrapeJobEvent>,
 }

 impl Worker {
-    pub fn new(id: usize, db_pool: PgPool, banner_api: Arc<BannerApi>) -> Self {
+    pub fn new(
+        id: usize,
+        db_pool: PgPool,
+        banner_api: Arc<BannerApi>,
+        job_events_tx: broadcast::Sender<ScrapeJobEvent>,
+    ) -> Self {
        Self {
            id,
            db_pool,
            banner_api,
+            job_events_tx,
        }
    }

@@ -60,22 +72,57 @@ impl Worker {
            let job_id = job.id;
            let retry_count = job.retry_count;
            let max_retries = job.max_retries;
+            let target_type = job.target_type;
+            let payload = job.target_payload.clone();
+            let priority = job.priority;
+            let queued_at = job.queued_at;
+            let started_at = Utc::now();
            let start = std::time::Instant::now();

-            // Process the job, racing against shutdown signal
+            // Emit JobLocked event
+            let locked_at = started_at.to_rfc3339();
+            debug!(job_id, "Emitting JobLocked event");
+            let _ = self.job_events_tx.send(ScrapeJobEvent::JobLocked {
+                id: job_id,
+                locked_at,
+                status: ScrapeJobStatus::Processing,
+            });
+
+            // Process the job, racing against shutdown signal and timeout
            let process_result = tokio::select! {
                _ = shutdown_rx.recv() => {
                    self.handle_shutdown_during_processing(job_id).await;
                    break;
                }
-                result = self.process_job(job) => result
+                result = async {
+                    match time::timeout(JOB_TIMEOUT, self.process_job(job)).await {
+                        Ok(result) => result,
+                        Err(_elapsed) => {
+                            Err(JobError::Recoverable(anyhow::anyhow!(
+                                "job timed out after {}s",
+                                JOB_TIMEOUT.as_secs()
+                            )))
+                        }
+                    }
+                } => result
            };

            let duration = start.elapsed();

            // Handle the job processing result
-            self.handle_job_result(job_id, retry_count, max_retries, process_result, duration)
-                .await;
+            self.handle_job_result(
+                job_id,
+                retry_count,
+                max_retries,
+                process_result,
+                duration,
+                target_type,
+                payload,
+                priority,
+                queued_at,
+                started_at,
+            )
+            .await;
        }
    }

@@ -87,7 +134,7 @@ impl Worker {
        scrape_jobs::fetch_and_lock_job(&self.db_pool).await
    }

-    async fn process_job(&self, job: ScrapeJob) -> Result<(), JobError> {
+    async fn process_job(&self, job: ScrapeJob) -> Result<UpsertCounts, JobError> {
        // Convert the database job to our job type
        let job_type = JobType::from_target_type_and_payload(job.target_type, job.target_payload)
            .map_err(|e| JobError::Unrecoverable(anyhow::anyhow!(e)))?; // Parse errors are unrecoverable
@@ -114,9 +161,7 @@ impl Worker {
            job_impl
                .process(&self.banner_api, &self.db_pool)
                .await
-                .map_err(JobError::Recoverable)?;
-
-            Ok(())
+                .map_err(JobError::Recoverable)
        }
        .instrument(span)
        .await
@@ -130,7 +175,11 @@ impl Worker {
        scrape_jobs::unlock_job(job_id, &self.db_pool).await
    }

-    async fn unlock_and_increment_retry(&self, job_id: i32, max_retries: i32) -> Result<bool> {
+    async fn unlock_and_increment_retry(
+        &self,
+        job_id: i32,
+        max_retries: i32,
+    ) -> Result<Option<chrono::DateTime<chrono::Utc>>> {
        scrape_jobs::unlock_and_increment_retry(job_id, max_retries, &self.db_pool).await
    }

@@ -156,31 +205,97 @@ impl Worker {
    }

    /// Handle the result of job processing
+    #[allow(clippy::too_many_arguments)]
    async fn handle_job_result(
        &self,
        job_id: i32,
        retry_count: i32,
        max_retries: i32,
-        result: Result<(), JobError>,
+        result: Result<UpsertCounts, JobError>,
        duration: std::time::Duration,
+        target_type: crate::data::models::TargetType,
+        payload: serde_json::Value,
+        priority: crate::data::models::ScrapePriority,
+        queued_at: DateTime<Utc>,
+        started_at: DateTime<Utc>,
    ) {
+        let duration_ms = duration.as_millis() as i32;
+
        match result {
-            Ok(()) => {
+            Ok(counts) => {
                debug!(
                    worker_id = self.id,
                    job_id,
                    duration_ms = duration.as_millis(),
+                    courses_fetched = counts.courses_fetched,
+                    courses_changed = counts.courses_changed,
+                    courses_unchanged = counts.courses_unchanged,
                    "Job completed successfully"
                );
+
+                // Log the result
+                if let Err(e) = scrape_jobs::insert_job_result(
+                    target_type,
+                    payload,
+                    priority,
+                    queued_at,
+                    started_at,
+                    duration_ms,
+                    true,
+                    None,
+                    retry_count,
+                    Some(&counts),
+                    &self.db_pool,
+                )
+                .await
+                {
+                    error!(worker_id = self.id, job_id, error = ?e, "Failed to insert job result");
+                }
+
                if let Err(e) = self.delete_job(job_id).await {
                    error!(worker_id = self.id, job_id, error = ?e, "Failed to delete completed job");
                }
+                debug!(job_id, "Emitting JobCompleted event");
+                let _ = self
+                    .job_events_tx
+                    .send(ScrapeJobEvent::JobCompleted { id: job_id });
            }
            Err(JobError::Recoverable(e)) => {
-                self.handle_recoverable_error(job_id, retry_count, max_retries, e, duration)
-                    .await;
+                self.handle_recoverable_error(
+                    job_id,
+                    retry_count,
+                    max_retries,
+                    e,
+                    duration,
+                    target_type,
+                    payload,
+                    priority,
+                    queued_at,
+                    started_at,
+                )
+                .await;
            }
            Err(JobError::Unrecoverable(e)) => {
+                // Log the failed result
+                let err_msg = format!("{e:#}");
+                if let Err(log_err) = scrape_jobs::insert_job_result(
+                    target_type,
+                    payload,
+                    priority,
+                    queued_at,
+                    started_at,
+                    duration_ms,
+                    false,
+                    Some(&err_msg),
+                    retry_count,
+                    None,
+                    &self.db_pool,
+                )
+                .await
+                {
+                    error!(worker_id = self.id, job_id, error = ?log_err, "Failed to insert job result");
+                }
+
                error!(
                    worker_id = self.id,
                    job_id,
@@ -191,11 +306,16 @@ impl Worker {
                if let Err(e) = self.delete_job(job_id).await {
                    error!(worker_id = self.id, job_id, error = ?e, "Failed to delete corrupted job");
                }
+                debug!(job_id, "Emitting JobDeleted event");
+                let _ = self
+                    .job_events_tx
+                    .send(ScrapeJobEvent::JobDeleted { id: job_id });
            }
        }
    }

    /// Handle recoverable errors by logging appropriately and unlocking the job
+    #[allow(clippy::too_many_arguments)]
    async fn handle_recoverable_error(
        &self,
        job_id: i32,
@@ -203,6 +323,11 @@ impl Worker {
        max_retries: i32,
        e: anyhow::Error,
        duration: std::time::Duration,
+        target_type: crate::data::models::TargetType,
+        payload: serde_json::Value,
+        priority: crate::data::models::ScrapePriority,
+        queued_at: DateTime<Utc>,
+        started_at: DateTime<Utc>,
    ) {
        let next_attempt = retry_count.saturating_add(1);
        let remaining_retries = max_retries.saturating_sub(next_attempt);
@@ -233,7 +358,7 @@ impl Worker {

        // Atomically unlock and increment retry count, checking if retry is allowed
        match self.unlock_and_increment_retry(job_id, max_retries).await {
-            Ok(can_retry) if can_retry => {
+            Ok(Some(new_queued_at)) => {
                debug!(
                    worker_id = self.id,
                    job_id,
@@ -241,9 +366,37 @@ impl Worker {
                    remaining_retries = remaining_retries,
                    "Job unlocked for retry"
                );
+                debug!(job_id, "Emitting JobRetried event");
+                let _ = self.job_events_tx.send(ScrapeJobEvent::JobRetried {
+                    id: job_id,
+                    retry_count: next_attempt,
+                    queued_at: new_queued_at.to_rfc3339(),
+                    status: ScrapeJobStatus::Pending,
+                });
+                // Don't log a result yet — the job will be retried
            }
-            Ok(_) => {
-                // Max retries exceeded (detected atomically)
+            Ok(None) => {
+                // Max retries exceeded — log final failure result
+                let duration_ms = duration.as_millis() as i32;
+                let err_msg = format!("{e:#}");
+                if let Err(log_err) = scrape_jobs::insert_job_result(
+                    target_type,
+                    payload,
+                    priority,
+                    queued_at,
+                    started_at,
+                    duration_ms,
+                    false,
+                    Some(&err_msg),
+                    next_attempt,
+                    None,
+                    &self.db_pool,
+                )
+                .await
+                {
+                    error!(worker_id = self.id, job_id, error = ?log_err, "Failed to insert job result");
+                }
+
                error!(
                    worker_id = self.id,
                    job_id,
@@ -256,6 +409,13 @@ impl Worker {
                if let Err(e) = self.delete_job(job_id).await {
                    error!(worker_id = self.id, job_id, error = ?e, "Failed to delete failed job");
                }
+                debug!(job_id, "Emitting JobExhausted and JobDeleted events");
+                let _ = self
+                    .job_events_tx
+                    .send(ScrapeJobEvent::JobExhausted { id: job_id });
+                let _ = self
+                    .job_events_tx
+                    .send(ScrapeJobEvent::JobDeleted { id: job_id });
            }
            Err(e) => {
                error!(worker_id = self.id, job_id, error = ?e, "Failed to unlock and increment retry count");
@@ -1,6 +1,7 @@
 use super::Service;
 use crate::state::AppState;
 use crate::status::ServiceStatus;
+use crate::web::auth::AuthConfig;
 use crate::web::create_router;
 use std::net::SocketAddr;
 use tokio::net::TcpListener;
@@ -11,14 +12,16 @@ use tracing::{info, trace, warn};
 pub struct WebService {
    port: u16,
    app_state: AppState,
+    auth_config: AuthConfig,
    shutdown_tx: Option<broadcast::Sender<()>>,
 }

 impl WebService {
-    pub fn new(port: u16, app_state: AppState) -> Self {
+    pub fn new(port: u16, app_state: AppState, auth_config: AuthConfig) -> Self {
        Self {
            port,
            app_state,
+            auth_config,
            shutdown_tx: None,
        }
    }
@@ -58,7 +61,7 @@ impl Service for WebService {

    async fn run(&mut self) -> Result<(), anyhow::Error> {
        // Create the main router with Banner API routes
-        let app = create_router(self.app_state.clone());
+        let app = create_router(self.app_state.clone(), self.auth_config.clone());

        let addr = SocketAddr::from(([0, 0, 0, 0], self.port));

@@ -4,18 +4,21 @@ use crate::banner::BannerApi;
 use crate::banner::Course;
 use crate::data::models::ReferenceData;
 use crate::status::ServiceStatusRegistry;
+use crate::web::session_cache::{OAuthStateStore, SessionCache};
+use crate::web::ws::ScrapeJobEvent;
 use anyhow::Result;
 use sqlx::PgPool;
 use std::collections::HashMap;
 use std::sync::Arc;
-use tokio::sync::RwLock;
+use tokio::sync::{RwLock, broadcast};

 /// In-memory cache for reference data (code→description lookups).
 ///
 /// Loaded from the `reference_data` table on startup and refreshed periodically.
+/// Uses a two-level HashMap so lookups take `&str` without allocating.
 pub struct ReferenceCache {
-    /// `(category, code)` → `description`
-    data: HashMap<(String, String), String>,
+    /// category → (code → description)
+    data: HashMap<String, HashMap<String, String>>,
 }

 impl Default for ReferenceCache {
@@ -34,27 +37,31 @@ impl ReferenceCache {

    /// Build cache from a list of reference data entries.
    pub fn from_entries(entries: Vec<ReferenceData>) -> Self {
-        let data = entries
-            .into_iter()
-            .map(|e| ((e.category, e.code), e.description))
-            .collect();
+        let mut data: HashMap<String, HashMap<String, String>> = HashMap::new();
+        for e in entries {
+            data.entry(e.category)
+                .or_default()
+                .insert(e.code, e.description);
+        }
        Self { data }
    }

-    /// Look up a description by category and code.
+    /// Look up a description by category and code. Zero allocations.
    pub fn lookup(&self, category: &str, code: &str) -> Option<&str> {
        self.data
-            .get(&(category.to_string(), code.to_string()))
+            .get(category)
+            .and_then(|codes| codes.get(code))
            .map(|s| s.as_str())
    }

    /// Get all `(code, description)` pairs for a category, sorted by description.
    pub fn entries_for_category(&self, category: &str) -> Vec<(&str, &str)> {
-        let mut entries: Vec<(&str, &str)> = self
-            .data
+        let Some(codes) = self.data.get(category) else {
+            return Vec::new();
+        };
+        let mut entries: Vec<(&str, &str)> = codes
            .iter()
-            .filter(|((cat, _), _)| cat == category)
-            .map(|((_, code), desc)| (code.as_str(), desc.as_str()))
+            .map(|(code, desc)| (code.as_str(), desc.as_str()))
            .collect();
        entries.sort_by(|a, b| a.1.cmp(b.1));
        entries
@@ -67,18 +74,30 @@ pub struct AppState {
    pub db_pool: PgPool,
    pub service_statuses: ServiceStatusRegistry,
    pub reference_cache: Arc<RwLock<ReferenceCache>>,
+    pub session_cache: SessionCache,
+    pub oauth_state_store: OAuthStateStore,
+    pub scrape_job_tx: broadcast::Sender<ScrapeJobEvent>,
 }

 impl AppState {
    pub fn new(banner_api: Arc<BannerApi>, db_pool: PgPool) -> Self {
+        let (scrape_job_tx, _) = broadcast::channel(64);
        Self {
+            session_cache: SessionCache::new(db_pool.clone()),
+            oauth_state_store: OAuthStateStore::new(),
            banner_api,
            db_pool,
            service_statuses: ServiceStatusRegistry::new(),
            reference_cache: Arc::new(RwLock::new(ReferenceCache::new())),
+            scrape_job_tx,
        }
    }

+    /// Subscribe to scrape job lifecycle events.
+    pub fn scrape_job_events(&self) -> broadcast::Receiver<ScrapeJobEvent> {
+        self.scrape_job_tx.subscribe()
+    }
+
    /// Initialize the reference cache from the database.
    pub async fn load_reference_cache(&self) -> Result<()> {
        let entries = crate::data::reference::get_all(&self.db_pool).await?;
@@ -10,6 +10,7 @@ use ts_rs::TS;
 #[serde(rename_all = "lowercase")]
 #[ts(export)]
 pub enum ServiceStatus {
+    #[allow(dead_code)]
    Starting,
    Active,
    Connected,
@@ -21,6 +22,7 @@ pub enum ServiceStatus {
 #[derive(Debug, Clone)]
 pub struct StatusEntry {
    pub status: ServiceStatus,
+    #[allow(dead_code)]
    pub updated_at: Instant,
 }

@@ -48,6 +50,7 @@ impl ServiceStatusRegistry {
    }

    /// Returns the current status of a named service, if present.
+    #[allow(dead_code)]
    pub fn get(&self, name: &str) -> Option<ServiceStatus> {
        self.inner.get(name).map(|entry| entry.status.clone())
    }
@@ -0,0 +1,269 @@
+//! Admin API handlers.
+//!
+//! All endpoints require the `AdminUser` extractor, returning 401/403 as needed.
+
+use axum::extract::{Path, State};
+use axum::http::{HeaderMap, StatusCode, header};
+use axum::response::{IntoResponse, Json, Response};
+use chrono::{DateTime, Utc};
+use serde::Deserialize;
+use serde_json::{Value, json};
+
+use crate::data::models::User;
+use crate::state::AppState;
+use crate::web::extractors::AdminUser;
+
+/// `GET /api/admin/status` — Enhanced system status for admins.
+pub async fn admin_status(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+) -> Result<Json<Value>, (StatusCode, Json<Value>)> {
+    let (user_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM users")
+        .fetch_one(&state.db_pool)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "failed to count users");
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": "failed to count users"})),
+            )
+        })?;
+
+    let (session_count,): (i64,) =
+        sqlx::query_as("SELECT COUNT(*) FROM user_sessions WHERE expires_at > now()")
+            .fetch_one(&state.db_pool)
+            .await
+            .map_err(|e| {
+                tracing::error!(error = %e, "failed to count sessions");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(json!({"error": "failed to count sessions"})),
+                )
+            })?;
+
+    let course_count = state.get_course_count().await.map_err(|e| {
+        tracing::error!(error = %e, "failed to count courses");
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": "failed to count courses"})),
+        )
+    })?;
+
+    let (scrape_job_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM scrape_jobs")
+        .fetch_one(&state.db_pool)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "failed to count scrape jobs");
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": "failed to count scrape jobs"})),
+            )
+        })?;
+
+    let services: Vec<Value> = state
+        .service_statuses
+        .all()
+        .into_iter()
+        .map(|(name, status)| {
+            json!({
+                "name": name,
+                "status": status,
+            })
+        })
+        .collect();
+
+    Ok(Json(json!({
+        "userCount": user_count,
+        "sessionCount": session_count,
+        "courseCount": course_count,
+        "scrapeJobCount": scrape_job_count,
+        "services": services,
+    })))
+}
+
+/// `GET /api/admin/users` — List all users.
+pub async fn list_users(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+) -> Result<Json<Vec<User>>, (StatusCode, Json<Value>)> {
+    let users = crate::data::users::list_users(&state.db_pool)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "failed to list users");
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": "failed to list users"})),
+            )
+        })?;
+
+    Ok(Json(users))
+}
+
+#[derive(Deserialize)]
+pub struct SetAdminBody {
+    is_admin: bool,
+}
+
+/// `PUT /api/admin/users/{discord_id}/admin` — Set admin status for a user.
+pub async fn set_user_admin(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+    Path(discord_id): Path<i64>,
+    Json(body): Json<SetAdminBody>,
+) -> Result<Json<User>, (StatusCode, Json<Value>)> {
+    let user = crate::data::users::set_admin(&state.db_pool, discord_id, body.is_admin)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "failed to set admin status");
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": "failed to set admin status"})),
+            )
+        })?
+        .ok_or_else(|| {
+            (
+                StatusCode::NOT_FOUND,
+                Json(json!({"error": "user not found"})),
+            )
+        })?;
+
+    state.session_cache.evict_user(discord_id);
+
+    Ok(Json(user))
+}
+
+/// `GET /api/admin/scrape-jobs` — List scrape jobs.
+pub async fn list_scrape_jobs(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+) -> Result<Json<Value>, (StatusCode, Json<Value>)> {
+    let rows = sqlx::query_as::<_, crate::data::models::ScrapeJob>(
+        "SELECT * FROM scrape_jobs ORDER BY priority DESC, execute_at ASC LIMIT 100",
+    )
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| {
+        tracing::error!(error = %e, "failed to list scrape jobs");
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": "failed to list scrape jobs"})),
+        )
+    })?;
+
+    let jobs: Vec<Value> = rows
+        .iter()
+        .map(|j| {
+            json!({
+                "id": j.id,
+                "targetType": format!("{:?}", j.target_type),
+                "targetPayload": j.target_payload,
+                "priority": format!("{:?}", j.priority),
+                "executeAt": j.execute_at.to_rfc3339(),
+                "createdAt": j.created_at.to_rfc3339(),
+                "lockedAt": j.locked_at.map(|t| t.to_rfc3339()),
+                "retryCount": j.retry_count,
+                "maxRetries": j.max_retries,
+                "queuedAt": j.queued_at.to_rfc3339(),
+                "status": j.status(),
+            })
+        })
+        .collect();
+
+    Ok(Json(json!({ "jobs": jobs })))
+}
+
+/// Row returned by the audit-log query (audit + joined course fields).
+#[derive(sqlx::FromRow, Debug)]
+struct AuditRow {
+    id: i32,
+    course_id: i32,
+    timestamp: chrono::DateTime<chrono::Utc>,
+    field_changed: String,
+    old_value: String,
+    new_value: String,
+    // Joined from courses table (nullable in case the course was deleted)
+    subject: Option<String>,
+    course_number: Option<String>,
+    crn: Option<String>,
+    title: Option<String>,
+}
+
+/// Format a `DateTime<Utc>` as an HTTP-date (RFC 2822) for Last-Modified headers.
+fn to_http_date(dt: &DateTime<Utc>) -> String {
+    dt.format("%a, %d %b %Y %H:%M:%S GMT").to_string()
+}
+
+/// Parse an `If-Modified-Since` header value into a `DateTime<Utc>`.
+fn parse_if_modified_since(headers: &HeaderMap) -> Option<DateTime<Utc>> {
+    let val = headers.get(header::IF_MODIFIED_SINCE)?.to_str().ok()?;
+    DateTime::parse_from_rfc2822(val)
+        .ok()
+        .map(|dt| dt.with_timezone(&Utc))
+}
+
+/// `GET /api/admin/audit-log` — List recent audit entries.
+///
+/// Supports `If-Modified-Since`: returns 304 when the newest entry hasn't changed.
+pub async fn list_audit_log(
+    AdminUser(_user): AdminUser,
+    headers: HeaderMap,
+    State(state): State<AppState>,
+) -> Result<Response, (StatusCode, Json<Value>)> {
+    let rows = sqlx::query_as::<_, AuditRow>(
+        "SELECT a.id, a.course_id, a.timestamp, a.field_changed, a.old_value, a.new_value, \
+                c.subject, c.course_number, c.crn, c.title \
+         FROM course_audits a \
+         LEFT JOIN courses c ON c.id = a.course_id \
+         ORDER BY a.timestamp DESC LIMIT 200",
+    )
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| {
+        tracing::error!(error = %e, "failed to list audit log");
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": "failed to list audit log"})),
+        )
+    })?;
+
+    // Determine the latest timestamp across all rows (query is DESC so first row is newest)
+    let latest = rows.first().map(|r| r.timestamp);
+
+    // If the client sent If-Modified-Since and our data hasn't changed, return 304
+    if let (Some(since), Some(latest_ts)) = (parse_if_modified_since(&headers), latest) {
+        // Truncate to seconds for comparison (HTTP dates have second precision)
+        if latest_ts.timestamp() <= since.timestamp() {
+            let mut resp = StatusCode::NOT_MODIFIED.into_response();
+            if let Ok(val) = to_http_date(&latest_ts).parse() {
+                resp.headers_mut().insert(header::LAST_MODIFIED, val);
+            }
+            return Ok(resp);
+        }
+    }
+
+    let entries: Vec<Value> = rows
+        .iter()
+        .map(|a| {
+            json!({
+                "id": a.id,
+                "courseId": a.course_id,
+                "timestamp": a.timestamp.to_rfc3339(),
+                "fieldChanged": a.field_changed,
+                "oldValue": a.old_value,
+                "newValue": a.new_value,
+                "subject": a.subject,
+                "courseNumber": a.course_number,
+                "crn": a.crn,
+                "courseTitle": a.title,
+            })
+        })
+        .collect();
+
+    let mut resp = Json(json!({ "entries": entries })).into_response();
+    if let Some(latest_ts) = latest
+        && let Ok(val) = to_http_date(&latest_ts).parse()
+    {
+        resp.headers_mut().insert(header::LAST_MODIFIED, val);
+    }
+    Ok(resp)
+}
@@ -0,0 +1,865 @@
+//! Admin API handlers for RMP instructor matching management.
+
+use axum::extract::{Path, Query, State};
+use axum::http::StatusCode;
+use axum::response::Json;
+use serde::{Deserialize, Serialize};
+use serde_json::{Value, json};
+use ts_rs::TS;
+
+use crate::state::AppState;
+use crate::web::extractors::AdminUser;
+
+// ---------------------------------------------------------------------------
+// Query / body types
+// ---------------------------------------------------------------------------
+
+#[derive(Deserialize)]
+pub struct ListInstructorsParams {
+    status: Option<String>,
+    search: Option<String>,
+    page: Option<i32>,
+    per_page: Option<i32>,
+    sort: Option<String>,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MatchBody {
+    rmp_legacy_id: i32,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RejectCandidateBody {
+    rmp_legacy_id: i32,
+}
+
+// ---------------------------------------------------------------------------
+// Response types
+// ---------------------------------------------------------------------------
+
+/// Simple acknowledgement response for mutating operations.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct OkResponse {
+    pub ok: bool,
+}
+
+/// A top-candidate summary shown in the instructor list view.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct TopCandidateResponse {
+    pub rmp_legacy_id: i32,
+    pub score: Option<f32>,
+    #[ts(as = "Option<std::collections::HashMap<String, f32>>")]
+    pub score_breakdown: Option<serde_json::Value>,
+    pub first_name: Option<String>,
+    pub last_name: Option<String>,
+    pub department: Option<String>,
+    pub avg_rating: Option<f32>,
+    pub num_ratings: Option<i32>,
+}
+
+/// An instructor row in the paginated list.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct InstructorListItem {
+    pub id: i32,
+    pub display_name: String,
+    pub email: String,
+    pub rmp_match_status: String,
+    #[ts(as = "i32")]
+    pub rmp_link_count: i64,
+    #[ts(as = "i32")]
+    pub candidate_count: i64,
+    #[ts(as = "i32")]
+    pub course_subject_count: i64,
+    pub top_candidate: Option<TopCandidateResponse>,
+}
+
+/// Aggregate status counts for the instructor list.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct InstructorStats {
+    #[ts(as = "i32")]
+    pub total: i64,
+    #[ts(as = "i32")]
+    pub unmatched: i64,
+    #[ts(as = "i32")]
+    pub auto: i64,
+    #[ts(as = "i32")]
+    pub confirmed: i64,
+    #[ts(as = "i32")]
+    pub rejected: i64,
+    #[ts(as = "i32")]
+    pub with_candidates: i64,
+}
+
+/// Response for `GET /api/admin/instructors`.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct ListInstructorsResponse {
+    pub instructors: Vec<InstructorListItem>,
+    #[ts(as = "i32")]
+    pub total: i64,
+    pub page: i32,
+    pub per_page: i32,
+    pub stats: InstructorStats,
+}
+
+/// Instructor summary in the detail view.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct InstructorDetail {
+    pub id: i32,
+    pub display_name: String,
+    pub email: String,
+    pub rmp_match_status: String,
+    pub subjects_taught: Vec<String>,
+    #[ts(as = "i32")]
+    pub course_count: i64,
+}
+
+/// A linked RMP profile in the detail view.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct LinkedRmpProfile {
+    pub link_id: i32,
+    pub legacy_id: i32,
+    pub first_name: Option<String>,
+    pub last_name: Option<String>,
+    pub department: Option<String>,
+    pub avg_rating: Option<f32>,
+    pub avg_difficulty: Option<f32>,
+    pub num_ratings: Option<i32>,
+    pub would_take_again_pct: Option<f32>,
+}
+
+/// A match candidate in the detail view.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct CandidateResponse {
+    pub id: i32,
+    pub rmp_legacy_id: i32,
+    pub first_name: Option<String>,
+    pub last_name: Option<String>,
+    pub department: Option<String>,
+    pub avg_rating: Option<f32>,
+    pub avg_difficulty: Option<f32>,
+    pub num_ratings: Option<i32>,
+    pub would_take_again_pct: Option<f32>,
+    pub score: Option<f32>,
+    #[ts(as = "Option<std::collections::HashMap<String, f32>>")]
+    pub score_breakdown: Option<serde_json::Value>,
+    pub status: String,
+}
+
+/// Response for `GET /api/admin/instructors/{id}` and `POST .../match`.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct InstructorDetailResponse {
+    pub instructor: InstructorDetail,
+    pub current_matches: Vec<LinkedRmpProfile>,
+    pub candidates: Vec<CandidateResponse>,
+}
+
+/// Response for `POST /api/admin/rmp/rescore`.
+#[derive(Debug, Clone, Serialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export)]
+pub struct RescoreResponse {
+    pub total_unmatched: usize,
+    pub candidates_created: usize,
+    pub auto_matched: usize,
+    pub skipped_unparseable: usize,
+    pub skipped_no_candidates: usize,
+}
+
+// ---------------------------------------------------------------------------
+// Helper: map sqlx errors to the standard admin error tuple
+// ---------------------------------------------------------------------------
+
+fn db_error(context: &str, e: sqlx::Error) -> (StatusCode, Json<Value>) {
+    tracing::error!(error = %e, "{context}");
+    (
+        StatusCode::INTERNAL_SERVER_ERROR,
+        Json(json!({"error": context})),
+    )
+}
+
+// ---------------------------------------------------------------------------
+// Row types for SQL queries
+// ---------------------------------------------------------------------------
+
+#[derive(sqlx::FromRow)]
+struct InstructorRow {
+    id: i32,
+    display_name: String,
+    email: String,
+    rmp_match_status: String,
+    rmp_link_count: Option<i64>,
+    top_candidate_rmp_id: Option<i32>,
+    top_candidate_score: Option<f32>,
+    top_candidate_breakdown: Option<serde_json::Value>,
+    tc_first_name: Option<String>,
+    tc_last_name: Option<String>,
+    tc_department: Option<String>,
+    tc_avg_rating: Option<f32>,
+    tc_num_ratings: Option<i32>,
+    candidate_count: Option<i64>,
+    course_subject_count: Option<i64>,
+}
+
+#[derive(sqlx::FromRow)]
+struct StatusCount {
+    rmp_match_status: String,
+    count: i64,
+}
+
+#[derive(sqlx::FromRow)]
+struct CandidateRow {
+    id: i32,
+    rmp_legacy_id: i32,
+    score: Option<f32>,
+    score_breakdown: Option<serde_json::Value>,
+    status: String,
+    first_name: Option<String>,
+    last_name: Option<String>,
+    department: Option<String>,
+    avg_rating: Option<f32>,
+    avg_difficulty: Option<f32>,
+    num_ratings: Option<i32>,
+    would_take_again_pct: Option<f32>,
+}
+
+#[derive(sqlx::FromRow)]
+struct LinkedRmpProfileRow {
+    link_id: i32,
+    legacy_id: i32,
+    first_name: Option<String>,
+    last_name: Option<String>,
+    department: Option<String>,
+    avg_rating: Option<f32>,
+    avg_difficulty: Option<f32>,
+    num_ratings: Option<i32>,
+    would_take_again_pct: Option<f32>,
+}
+
+// ---------------------------------------------------------------------------
+// 1. GET /api/admin/instructors — paginated list with filtering
+// ---------------------------------------------------------------------------
+
+/// `GET /api/admin/instructors` — List instructors with filtering and pagination.
+pub async fn list_instructors(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+    Query(params): Query<ListInstructorsParams>,
+) -> Result<Json<ListInstructorsResponse>, (StatusCode, Json<Value>)> {
+    let page = params.page.unwrap_or(1).max(1);
+    let per_page = params.per_page.unwrap_or(50).clamp(1, 100);
+    let offset = (page - 1) * per_page;
+
+    let sort_clause = match params.sort.as_deref() {
+        Some("name_asc") => "i.display_name ASC",
+        Some("name_desc") => "i.display_name DESC",
+        Some("status") => "i.rmp_match_status ASC, i.display_name ASC",
+        _ => "tc.score DESC NULLS LAST, i.display_name ASC",
+    };
+
+    // Build WHERE clause
+    let mut conditions = Vec::new();
+    let mut bind_idx = 0u32;
+
+    if params.status.is_some() {
+        bind_idx += 1;
+        conditions.push(format!("i.rmp_match_status = ${bind_idx}"));
+    }
+    if params.search.is_some() {
+        bind_idx += 1;
+        conditions.push(format!(
+            "(i.display_name ILIKE ${bind_idx} OR i.email ILIKE ${bind_idx})"
+        ));
+    }
+
+    let where_clause = if conditions.is_empty() {
+        String::new()
+    } else {
+        format!("WHERE {}", conditions.join(" AND "))
+    };
+
+    let query_str = format!(
+        r#"
+        SELECT
+            i.id, i.display_name, i.email, i.rmp_match_status,
+            (SELECT COUNT(*) FROM instructor_rmp_links irl WHERE irl.instructor_id = i.id) as rmp_link_count,
+            tc.rmp_legacy_id as top_candidate_rmp_id,
+            tc.score as top_candidate_score,
+            tc.score_breakdown as top_candidate_breakdown,
+            rp.first_name as tc_first_name,
+            rp.last_name as tc_last_name,
+            rp.department as tc_department,
+            rp.avg_rating as tc_avg_rating,
+            rp.num_ratings as tc_num_ratings,
+            (SELECT COUNT(*) FROM rmp_match_candidates mc WHERE mc.instructor_id = i.id AND mc.status = 'pending') as candidate_count,
+            (SELECT COUNT(DISTINCT c.subject) FROM course_instructors ci JOIN courses c ON c.id = ci.course_id WHERE ci.instructor_id = i.id) as course_subject_count
+        FROM instructors i
+        LEFT JOIN LATERAL (
+            SELECT mc.rmp_legacy_id, mc.score, mc.score_breakdown
+            FROM rmp_match_candidates mc
+            WHERE mc.instructor_id = i.id AND mc.status = 'pending'
+            ORDER BY mc.score DESC
+            LIMIT 1
+        ) tc ON true
+        LEFT JOIN rmp_professors rp ON rp.legacy_id = tc.rmp_legacy_id
+        {where_clause}
+        ORDER BY {sort_clause}
+        LIMIT {per_page} OFFSET {offset}
+        "#
+    );
+
+    // Build the query with dynamic binds
+    let mut query = sqlx::query_as::<_, InstructorRow>(&query_str);
+    if let Some(ref status) = params.status {
+        query = query.bind(status);
+    }
+    if let Some(ref search) = params.search {
+        query = query.bind(format!("%{search}%"));
+    }
+
+    let rows = query
+        .fetch_all(&state.db_pool)
+        .await
+        .map_err(|e| db_error("failed to list instructors", e))?;
+
+    // Count total with filters
+    let count_query_str = format!("SELECT COUNT(*) FROM instructors i {where_clause}");
+    let mut count_query = sqlx::query_as::<_, (i64,)>(&count_query_str);
+    if let Some(ref status) = params.status {
+        count_query = count_query.bind(status);
+    }
+    if let Some(ref search) = params.search {
+        count_query = count_query.bind(format!("%{search}%"));
+    }
+
+    let (total,) = count_query
+        .fetch_one(&state.db_pool)
+        .await
+        .map_err(|e| db_error("failed to count instructors", e))?;
+
+    // Aggregate stats (unfiltered)
+    let stats_rows = sqlx::query_as::<_, StatusCount>(
+        "SELECT rmp_match_status, COUNT(*) as count FROM instructors GROUP BY rmp_match_status",
+    )
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to get instructor stats", e))?;
+
+    // Count instructors with at least one candidate (for progress bar denominator)
+    let (with_candidates,): (i64,) =
+        sqlx::query_as("SELECT COUNT(DISTINCT instructor_id) FROM rmp_match_candidates")
+            .fetch_one(&state.db_pool)
+            .await
+            .map_err(|e| db_error("failed to count instructors with candidates", e))?;
+
+    let mut stats = InstructorStats {
+        total: 0,
+        unmatched: 0,
+        auto: 0,
+        confirmed: 0,
+        rejected: 0,
+        with_candidates,
+    };
+    for row in &stats_rows {
+        stats.total += row.count;
+        match row.rmp_match_status.as_str() {
+            "unmatched" => stats.unmatched = row.count,
+            "auto" => stats.auto = row.count,
+            "confirmed" => stats.confirmed = row.count,
+            "rejected" => stats.rejected = row.count,
+            _ => {}
+        }
+    }
+
+    let instructors: Vec<InstructorListItem> = rows
+        .iter()
+        .map(|r| {
+            let top_candidate = r.top_candidate_rmp_id.map(|rmp_id| TopCandidateResponse {
+                rmp_legacy_id: rmp_id,
+                score: r.top_candidate_score,
+                score_breakdown: r.top_candidate_breakdown.clone(),
+                first_name: r.tc_first_name.clone(),
+                last_name: r.tc_last_name.clone(),
+                department: r.tc_department.clone(),
+                avg_rating: r.tc_avg_rating,
+                num_ratings: r.tc_num_ratings,
+            });
+
+            InstructorListItem {
+                id: r.id,
+                display_name: r.display_name.clone(),
+                email: r.email.clone(),
+                rmp_match_status: r.rmp_match_status.clone(),
+                rmp_link_count: r.rmp_link_count.unwrap_or(0),
+                candidate_count: r.candidate_count.unwrap_or(0),
+                course_subject_count: r.course_subject_count.unwrap_or(0),
+                top_candidate,
+            }
+        })
+        .collect();
+
+    Ok(Json(ListInstructorsResponse {
+        instructors,
+        total,
+        page,
+        per_page,
+        stats,
+    }))
+}
+
+// ---------------------------------------------------------------------------
+// 2. GET /api/admin/instructors/{id} — full detail
+// ---------------------------------------------------------------------------
+
+/// `GET /api/admin/instructors/{id}` — Full instructor detail with candidates.
+pub async fn get_instructor(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+    Path(id): Path<i32>,
+) -> Result<Json<InstructorDetailResponse>, (StatusCode, Json<Value>)> {
+    build_instructor_detail(&state, id).await
+}
+
+/// Shared helper that builds the full instructor detail response.
+async fn build_instructor_detail(
+    state: &AppState,
+    id: i32,
+) -> Result<Json<InstructorDetailResponse>, (StatusCode, Json<Value>)> {
+    // Fetch instructor
+    let instructor: Option<(i32, String, String, String)> = sqlx::query_as(
+        "SELECT id, display_name, email, rmp_match_status FROM instructors WHERE id = $1",
+    )
+    .bind(id)
+    .fetch_optional(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to fetch instructor", e))?;
+
+    let (inst_id, display_name, email, rmp_match_status) = instructor.ok_or_else(|| {
+        (
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "instructor not found"})),
+        )
+    })?;
+
+    // Subjects taught
+    let subjects: Vec<(String,)> = sqlx::query_as(
+        "SELECT DISTINCT c.subject FROM course_instructors ci JOIN courses c ON c.id = ci.course_id WHERE ci.instructor_id = $1 ORDER BY c.subject",
+    )
+    .bind(inst_id)
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to fetch subjects", e))?;
+
+    // Course count
+    let (course_count,): (i64,) = sqlx::query_as(
+        "SELECT COUNT(DISTINCT ci.course_id) FROM course_instructors ci WHERE ci.instructor_id = $1",
+    )
+    .bind(inst_id)
+    .fetch_one(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to count courses", e))?;
+
+    // Candidates with RMP professor info
+    let candidates = sqlx::query_as::<_, CandidateRow>(
+        r#"
+        SELECT mc.id, mc.rmp_legacy_id, mc.score, mc.score_breakdown, mc.status,
+               rp.first_name, rp.last_name, rp.department,
+               rp.avg_rating, rp.avg_difficulty, rp.num_ratings, rp.would_take_again_pct
+        FROM rmp_match_candidates mc
+        JOIN rmp_professors rp ON rp.legacy_id = mc.rmp_legacy_id
+        WHERE mc.instructor_id = $1
+        ORDER BY mc.score DESC
+        "#,
+    )
+    .bind(inst_id)
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to fetch candidates", e))?;
+
+    // Current matches (all linked RMP profiles)
+    let current_matches = sqlx::query_as::<_, LinkedRmpProfileRow>(
+        r#"
+        SELECT irl.id as link_id,
+               rp.legacy_id, rp.first_name, rp.last_name, rp.department,
+               rp.avg_rating, rp.avg_difficulty, rp.num_ratings, rp.would_take_again_pct
+        FROM instructor_rmp_links irl
+        JOIN rmp_professors rp ON rp.legacy_id = irl.rmp_legacy_id
+        WHERE irl.instructor_id = $1
+        ORDER BY rp.num_ratings DESC NULLS LAST
+        "#,
+    )
+    .bind(inst_id)
+    .fetch_all(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to fetch linked rmp profiles", e))?;
+
+    let current_matches_resp: Vec<LinkedRmpProfile> = current_matches
+        .into_iter()
+        .map(|p| LinkedRmpProfile {
+            link_id: p.link_id,
+            legacy_id: p.legacy_id,
+            first_name: p.first_name,
+            last_name: p.last_name,
+            department: p.department,
+            avg_rating: p.avg_rating,
+            avg_difficulty: p.avg_difficulty,
+            num_ratings: p.num_ratings,
+            would_take_again_pct: p.would_take_again_pct,
+        })
+        .collect();
+
+    let candidates_resp: Vec<CandidateResponse> = candidates
+        .into_iter()
+        .map(|c| CandidateResponse {
+            id: c.id,
+            rmp_legacy_id: c.rmp_legacy_id,
+            first_name: c.first_name,
+            last_name: c.last_name,
+            department: c.department,
+            avg_rating: c.avg_rating,
+            avg_difficulty: c.avg_difficulty,
+            num_ratings: c.num_ratings,
+            would_take_again_pct: c.would_take_again_pct,
+            score: c.score,
+            score_breakdown: c.score_breakdown,
+            status: c.status,
+        })
+        .collect();
+
+    Ok(Json(InstructorDetailResponse {
+        instructor: InstructorDetail {
+            id: inst_id,
+            display_name,
+            email,
+            rmp_match_status,
+            subjects_taught: subjects.into_iter().map(|(s,)| s).collect(),
+            course_count,
+        },
+        current_matches: current_matches_resp,
+        candidates: candidates_resp,
+    }))
+}
+
+// ---------------------------------------------------------------------------
+// 3. POST /api/admin/instructors/{id}/match — accept a candidate
+// ---------------------------------------------------------------------------
+
+/// `POST /api/admin/instructors/{id}/match` — Accept a candidate match.
+pub async fn match_instructor(
+    AdminUser(user): AdminUser,
+    State(state): State<AppState>,
+    Path(id): Path<i32>,
+    Json(body): Json<MatchBody>,
+) -> Result<Json<InstructorDetailResponse>, (StatusCode, Json<Value>)> {
+    // Verify the candidate exists and is pending
+    let candidate: Option<(i32,)> = sqlx::query_as(
+        "SELECT id FROM rmp_match_candidates WHERE instructor_id = $1 AND rmp_legacy_id = $2 AND status = 'pending'",
+    )
+    .bind(id)
+    .bind(body.rmp_legacy_id)
+    .fetch_optional(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to check candidate", e))?;
+
+    if candidate.is_none() {
+        return Err((
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "pending candidate not found for this instructor"})),
+        ));
+    }
+
+    // Check if this RMP profile is already linked to a different instructor
+    let conflict: Option<(i32,)> = sqlx::query_as(
+        "SELECT instructor_id FROM instructor_rmp_links WHERE rmp_legacy_id = $1 AND instructor_id != $2",
+    )
+    .bind(body.rmp_legacy_id)
+    .bind(id)
+    .fetch_optional(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to check rmp uniqueness", e))?;
+
+    if let Some((other_id,)) = conflict {
+        return Err((
+            StatusCode::CONFLICT,
+            Json(json!({
+                "error": "RMP profile already linked to another instructor",
+                "conflictingInstructorId": other_id,
+            })),
+        ));
+    }
+
+    let mut tx = state
+        .db_pool
+        .begin()
+        .await
+        .map_err(|e| db_error("failed to begin transaction", e))?;
+
+    // Insert link into instructor_rmp_links
+    sqlx::query(
+        "INSERT INTO instructor_rmp_links (instructor_id, rmp_legacy_id, created_by, source) VALUES ($1, $2, $3, 'manual') ON CONFLICT (rmp_legacy_id) DO NOTHING",
+    )
+    .bind(id)
+    .bind(body.rmp_legacy_id)
+    .bind(user.discord_id)
+    .execute(&mut *tx)
+    .await
+    .map_err(|e| db_error("failed to insert rmp link", e))?;
+
+    // Update instructor match status
+    sqlx::query("UPDATE instructors SET rmp_match_status = 'confirmed' WHERE id = $1")
+        .bind(id)
+        .execute(&mut *tx)
+        .await
+        .map_err(|e| db_error("failed to update instructor match status", e))?;
+
+    // Accept the candidate
+    sqlx::query(
+        "UPDATE rmp_match_candidates SET status = 'accepted', resolved_at = NOW(), resolved_by = $1 WHERE instructor_id = $2 AND rmp_legacy_id = $3",
+    )
+    .bind(user.discord_id)
+    .bind(id)
+    .bind(body.rmp_legacy_id)
+    .execute(&mut *tx)
+    .await
+    .map_err(|e| db_error("failed to accept candidate", e))?;
+
+    tx.commit()
+        .await
+        .map_err(|e| db_error("failed to commit transaction", e))?;
+
+    build_instructor_detail(&state, id).await
+}
+
+// ---------------------------------------------------------------------------
+// 4. POST /api/admin/instructors/{id}/reject-candidate — reject one candidate
+// ---------------------------------------------------------------------------
+
+/// `POST /api/admin/instructors/{id}/reject-candidate` — Reject a single candidate.
+pub async fn reject_candidate(
+    AdminUser(user): AdminUser,
+    State(state): State<AppState>,
+    Path(id): Path<i32>,
+    Json(body): Json<RejectCandidateBody>,
+) -> Result<Json<OkResponse>, (StatusCode, Json<Value>)> {
+    let result = sqlx::query(
+        "UPDATE rmp_match_candidates SET status = 'rejected', resolved_at = NOW(), resolved_by = $1 WHERE instructor_id = $2 AND rmp_legacy_id = $3 AND status = 'pending'",
+    )
+    .bind(user.discord_id)
+    .bind(id)
+    .bind(body.rmp_legacy_id)
+    .execute(&state.db_pool)
+    .await
+    .map_err(|e| db_error("failed to reject candidate", e))?;
+
+    if result.rows_affected() == 0 {
+        return Err((
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "pending candidate not found"})),
+        ));
+    }
+
+    Ok(Json(OkResponse { ok: true }))
+}
+
+// ---------------------------------------------------------------------------
+// 5. POST /api/admin/instructors/{id}/reject-all — no valid match
+// ---------------------------------------------------------------------------
+
+/// `POST /api/admin/instructors/{id}/reject-all` — Mark instructor as having no valid RMP match.
+pub async fn reject_all(
+    AdminUser(user): AdminUser,
+    State(state): State<AppState>,
+    Path(id): Path<i32>,
+) -> Result<Json<OkResponse>, (StatusCode, Json<Value>)> {
+    let mut tx = state
+        .db_pool
+        .begin()
+        .await
+        .map_err(|e| db_error("failed to begin transaction", e))?;
+
+    // Check current status — cannot reject an instructor with confirmed matches
+    let current_status: Option<(String,)> =
+        sqlx::query_as("SELECT rmp_match_status FROM instructors WHERE id = $1")
+            .bind(id)
+            .fetch_optional(&mut *tx)
+            .await
+            .map_err(|e| db_error("failed to fetch instructor status", e))?;
+
+    let (status,) = current_status.ok_or_else(|| {
+        (
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "instructor not found"})),
+        )
+    })?;
+
+    if status == "confirmed" {
+        return Err((
+            StatusCode::CONFLICT,
+            Json(
+                json!({"error": "cannot reject instructor with confirmed matches — unmatch first"}),
+            ),
+        ));
+    }
+
+    // Update instructor status
+    sqlx::query("UPDATE instructors SET rmp_match_status = 'rejected' WHERE id = $1")
+        .bind(id)
+        .execute(&mut *tx)
+        .await
+        .map_err(|e| db_error("failed to update instructor status", e))?;
+
+    // Reject all pending candidates
+    sqlx::query(
+        "UPDATE rmp_match_candidates SET status = 'rejected', resolved_at = NOW(), resolved_by = $1 WHERE instructor_id = $2 AND status = 'pending'",
+    )
+    .bind(user.discord_id)
+    .bind(id)
+    .execute(&mut *tx)
+    .await
+    .map_err(|e| db_error("failed to reject candidates", e))?;
+
+    tx.commit()
+        .await
+        .map_err(|e| db_error("failed to commit transaction", e))?;
+
+    Ok(Json(OkResponse { ok: true }))
+}
+
+// ---------------------------------------------------------------------------
+// 6. POST /api/admin/instructors/{id}/unmatch — remove current match
+// ---------------------------------------------------------------------------
+
+/// Body for unmatch — optional `rmpLegacyId` to remove a specific link.
+/// If omitted (or null), all links are removed.
+#[derive(Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct UnmatchBody {
+    rmp_legacy_id: Option<i32>,
+}
+
+/// `POST /api/admin/instructors/{id}/unmatch` — Remove RMP link(s).
+///
+/// Send `{ "rmpLegacyId": N }` to remove a specific link, or an empty body / `{}`
+/// to remove all links for the instructor.
+pub async fn unmatch_instructor(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+    Path(id): Path<i32>,
+    body: Option<Json<UnmatchBody>>,
+) -> Result<Json<OkResponse>, (StatusCode, Json<Value>)> {
+    let rmp_legacy_id = body.and_then(|b| b.rmp_legacy_id);
+
+    let mut tx = state
+        .db_pool
+        .begin()
+        .await
+        .map_err(|e| db_error("failed to begin transaction", e))?;
+
+    // Verify instructor exists
+    let exists: Option<(i32,)> = sqlx::query_as("SELECT id FROM instructors WHERE id = $1")
+        .bind(id)
+        .fetch_optional(&mut *tx)
+        .await
+        .map_err(|e| db_error("failed to check instructor", e))?;
+
+    if exists.is_none() {
+        return Err((
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "instructor not found"})),
+        ));
+    }
+
+    // Delete specific link or all links
+    if let Some(legacy_id) = rmp_legacy_id {
+        let result = sqlx::query(
+            "DELETE FROM instructor_rmp_links WHERE instructor_id = $1 AND rmp_legacy_id = $2",
+        )
+        .bind(id)
+        .bind(legacy_id)
+        .execute(&mut *tx)
+        .await
+        .map_err(|e| db_error("failed to remove rmp link", e))?;
+
+        if result.rows_affected() == 0 {
+            return Err((
+                StatusCode::NOT_FOUND,
+                Json(json!({"error": "link not found for this instructor"})),
+            ));
+        }
+    } else {
+        sqlx::query("DELETE FROM instructor_rmp_links WHERE instructor_id = $1")
+            .bind(id)
+            .execute(&mut *tx)
+            .await
+            .map_err(|e| db_error("failed to remove rmp links", e))?;
+    }
+
+    // Check if any links remain; update status accordingly
+    let (remaining,): (i64,) =
+        sqlx::query_as("SELECT COUNT(*) FROM instructor_rmp_links WHERE instructor_id = $1")
+            .bind(id)
+            .fetch_one(&mut *tx)
+            .await
+            .map_err(|e| db_error("failed to count remaining links", e))?;
+
+    if remaining == 0 {
+        sqlx::query("UPDATE instructors SET rmp_match_status = 'unmatched' WHERE id = $1")
+            .bind(id)
+            .execute(&mut *tx)
+            .await
+            .map_err(|e| db_error("failed to update instructor status", e))?;
+    }
+
+    tx.commit()
+        .await
+        .map_err(|e| db_error("failed to commit transaction", e))?;
+
+    Ok(Json(OkResponse { ok: true }))
+}
+
+// ---------------------------------------------------------------------------
+// 7. POST /api/admin/rmp/rescore — re-run candidate generation
+// ---------------------------------------------------------------------------
+
+/// `POST /api/admin/rmp/rescore` — Re-run RMP candidate generation.
+pub async fn rescore(
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+) -> Result<Json<RescoreResponse>, (StatusCode, Json<Value>)> {
+    let stats = crate::data::rmp_matching::generate_candidates(&state.db_pool)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "failed to run candidate generation");
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": "candidate generation failed"})),
+            )
+        })?;
+
+    Ok(Json(RescoreResponse {
+        total_unmatched: stats.total_unmatched,
+        candidates_created: stats.candidates_created,
+        auto_matched: stats.auto_matched,
+        skipped_unparseable: stats.skipped_unparseable,
+        skipped_no_candidates: stats.skipped_no_candidates,
+    }))
+}
@@ -1,14 +1,18 @@
-//! Embedded assets for the web frontend
+//! Embedded assets for the web frontend.
 //!
-//! This module handles serving static assets that are embedded into the binary
-//! at compile time using rust-embed.
+//! Serves static assets embedded into the binary at compile time using rust-embed.
+//! Supports content negotiation for pre-compressed variants (.br, .gz, .zst)
+//! generated at build time by `web/scripts/compress-assets.ts`.

+use axum::http::{HeaderMap, HeaderValue, header};
 use dashmap::DashMap;
 use rapidhash::v3::rapidhash_v3;
 use rust_embed::RustEmbed;
 use std::fmt;
 use std::sync::LazyLock;

+use super::encoding::{COMPRESSION_MIN_SIZE, ContentEncoding, parse_accepted_encodings};
+
 /// Embedded web assets from the dist directory
 #[derive(RustEmbed)]
 #[folder = "web/dist/"]
@@ -21,17 +25,15 @@ pub struct WebAssets;
 pub struct AssetHash(u64);

 impl AssetHash {
-    /// Create a new AssetHash from u64 value
    pub fn new(hash: u64) -> Self {
        Self(hash)
    }

-    /// Get the hash as a hex string
    pub fn to_hex(&self) -> String {
        format!("{:016x}", self.0)
    }

-    /// Get the hash as a quoted hex string
+    /// Get the hash as a quoted hex string (for ETag headers)
    pub fn quoted(&self) -> String {
        format!("\"{}\"", self.to_hex())
    }
@@ -51,12 +53,8 @@ pub struct AssetMetadata {
 }

 impl AssetMetadata {
-    /// Check if the etag matches the asset hash
    pub fn etag_matches(&self, etag: &str) -> bool {
-        // Remove quotes if present (ETags are typically quoted)
        let etag = etag.trim_matches('"');
-
-        // ETags generated from u64 hex should be 16 characters
        etag.len() == 16
            && u64::from_str_radix(etag, 16)
                .map(|parsed| parsed == self.hash.0)
@@ -68,28 +66,125 @@ impl AssetMetadata {
 static ASSET_CACHE: LazyLock<DashMap<String, AssetMetadata>> = LazyLock::new(DashMap::new);

 /// Get cached asset metadata for a file path, caching on-demand
-/// Returns AssetMetadata containing MIME type and RapidHash hash
 pub fn get_asset_metadata_cached(path: &str, content: &[u8]) -> AssetMetadata {
-    // Check cache first
    if let Some(cached) = ASSET_CACHE.get(path) {
        return cached.value().clone();
    }

-    // Calculate MIME type
    let mime_type = mime_guess::from_path(path)
        .first()
        .map(|mime| mime.to_string());
-
-    // Calculate RapidHash hash (using u64 native output size)
-    let hash_value = rapidhash_v3(content);
-    let hash = AssetHash::new(hash_value);
-
+    let hash = AssetHash::new(rapidhash_v3(content));
    let metadata = AssetMetadata { mime_type, hash };

-    // Only cache if we haven't exceeded the limit
    if ASSET_CACHE.len() < 1000 {
        ASSET_CACHE.insert(path.to_string(), metadata.clone());
    }

    metadata
 }
+
+/// Set appropriate `Cache-Control` header based on the asset path.
+///
+/// SvelteKit outputs fingerprinted assets under `_app/immutable/` which are
+/// safe to cache indefinitely. Other assets get shorter cache durations.
+fn set_cache_control(headers: &mut HeaderMap, path: &str) {
+    let cache_control = if path.contains("immutable/") {
+        // SvelteKit fingerprinted assets — cache forever
+        "public, max-age=31536000, immutable"
+    } else if path == "index.html" || path.ends_with(".html") {
+        "public, max-age=300"
+    } else {
+        match path.rsplit_once('.').map(|(_, ext)| ext) {
+            Some("css" | "js") => "public, max-age=86400",
+            Some("png" | "jpg" | "jpeg" | "gif" | "svg" | "ico") => "public, max-age=2592000",
+            _ => "public, max-age=3600",
+        }
+    };
+
+    if let Ok(value) = HeaderValue::from_str(cache_control) {
+        headers.insert(header::CACHE_CONTROL, value);
+    }
+}
+
+/// Serve an embedded asset with content encoding negotiation.
+///
+/// Tries pre-compressed variants (.br, .gz, .zst) in the order preferred by
+/// the client's `Accept-Encoding` header, falling back to the uncompressed
+/// original. Returns `None` if the asset doesn't exist at all.
+pub fn try_serve_asset_with_encoding(
+    path: &str,
+    request_headers: &HeaderMap,
+) -> Option<axum::response::Response> {
+    use axum::response::IntoResponse;
+
+    let asset_path = path.strip_prefix('/').unwrap_or(path);
+
+    // Get the uncompressed original first (for metadata: MIME type, ETag)
+    let original = WebAssets::get(asset_path)?;
+    let metadata = get_asset_metadata_cached(asset_path, &original.data);
+
+    // Check ETag for conditional requests (304 Not Modified)
+    if let Some(etag) = request_headers.get(header::IF_NONE_MATCH)
+        && etag.to_str().is_ok_and(|s| metadata.etag_matches(s))
+    {
+        return Some(axum::http::StatusCode::NOT_MODIFIED.into_response());
+    }
+
+    let mime_type = metadata
+        .mime_type
+        .unwrap_or_else(|| "application/octet-stream".to_string());
+
+    // Only attempt pre-compressed variants for files above the compression
+    // threshold — the build script skips smaller files too.
+    let accepted_encodings = if original.data.len() >= COMPRESSION_MIN_SIZE {
+        parse_accepted_encodings(request_headers)
+    } else {
+        vec![ContentEncoding::Identity]
+    };
+
+    for encoding in &accepted_encodings {
+        if *encoding == ContentEncoding::Identity {
+            continue;
+        }
+
+        let compressed_path = format!("{}{}", asset_path, encoding.extension());
+        if let Some(compressed) = WebAssets::get(&compressed_path) {
+            let mut response_headers = HeaderMap::new();
+
+            if let Ok(ct) = HeaderValue::from_str(&mime_type) {
+                response_headers.insert(header::CONTENT_TYPE, ct);
+            }
+            if let Some(ce) = encoding.header_value() {
+                response_headers.insert(header::CONTENT_ENCODING, ce);
+            }
+            if let Ok(etag_val) = HeaderValue::from_str(&metadata.hash.quoted()) {
+                response_headers.insert(header::ETAG, etag_val);
+            }
+            // Vary so caches distinguish by encoding
+            response_headers.insert(header::VARY, HeaderValue::from_static("Accept-Encoding"));
+            set_cache_control(&mut response_headers, asset_path);
+
+            return Some(
+                (
+                    axum::http::StatusCode::OK,
+                    response_headers,
+                    compressed.data,
+                )
+                    .into_response(),
+            );
+        }
+    }
+
+    // No compressed variant found — serve uncompressed original
+    let mut response_headers = HeaderMap::new();
+    if let Ok(ct) = HeaderValue::from_str(&mime_type) {
+        response_headers.insert(header::CONTENT_TYPE, ct);
+    }
+    if let Ok(etag_val) = HeaderValue::from_str(&metadata.hash.quoted()) {
+        response_headers.insert(header::ETAG, etag_val);
+    }
+    set_cache_control(&mut response_headers, asset_path);
+
+    Some((axum::http::StatusCode::OK, response_headers, original.data).into_response())
+}
@@ -0,0 +1,300 @@
+//! Discord OAuth2 authentication handlers.
+//!
+//! Provides login, callback, logout, and session introspection endpoints
+//! for Discord OAuth2 authentication flow.
+
+use axum::extract::{Extension, Query, State};
+use axum::http::{HeaderMap, StatusCode, header};
+use axum::response::{IntoResponse, Json, Redirect, Response};
+use serde::Deserialize;
+use serde_json::{Value, json};
+use std::time::Duration;
+use tracing::{error, info, warn};
+
+use crate::state::AppState;
+
+/// OAuth configuration passed as an Axum Extension.
+#[derive(Clone)]
+pub struct AuthConfig {
+    pub client_id: String,
+    pub client_secret: String,
+    /// Optional base URL override (e.g. "https://banner.xevion.dev").
+    /// When `None`, the redirect URI is derived from the request's Origin/Host header.
+    pub redirect_base: Option<String>,
+}
+
+const CALLBACK_PATH: &str = "/api/auth/callback";
+
+/// Derive the origin (scheme + host + port) the user's browser is actually on.
+///
+/// Priority:
+/// 1. Configured `redirect_base` (production override)
+/// 2. `Referer` header — preserves the real browser origin even through
+///    reverse proxies that rewrite `Host` (e.g. Vite dev proxy with
+///    `changeOrigin: true`)
+/// 3. `Origin` header (present on POST / CORS requests)
+/// 4. `Host` header (last resort, may be rewritten by proxies)
+fn resolve_origin(auth_config: &AuthConfig, headers: &HeaderMap) -> String {
+    if let Some(base) = &auth_config.redirect_base {
+        return base.trim_end_matches('/').to_owned();
+    }
+
+    // Referer carries the full browser URL; extract just the origin.
+    if let Some(referer) = headers.get(header::REFERER).and_then(|v| v.to_str().ok())
+        && let Ok(parsed) = url::Url::parse(referer)
+    {
+        let origin = parsed.origin().unicode_serialization();
+        if origin != "null" {
+            return origin;
+        }
+    }
+
+    if let Some(origin) = headers.get("origin").and_then(|v| v.to_str().ok()) {
+        return origin.trim_end_matches('/').to_owned();
+    }
+
+    if let Some(host) = headers.get(header::HOST).and_then(|v| v.to_str().ok()) {
+        return format!("http://{host}");
+    }
+
+    "http://localhost:8080".to_owned()
+}
+
+#[derive(Deserialize)]
+pub struct CallbackParams {
+    code: String,
+    state: String,
+}
+
+#[derive(Deserialize)]
+struct TokenResponse {
+    access_token: String,
+}
+
+#[derive(Deserialize)]
+struct DiscordUser {
+    id: String,
+    username: String,
+    avatar: Option<String>,
+}
+
+/// Extract the `session` cookie value from request headers.
+fn extract_session_token(headers: &HeaderMap) -> Option<String> {
+    headers
+        .get(header::COOKIE)?
+        .to_str()
+        .ok()?
+        .split(';')
+        .find_map(|cookie| {
+            let cookie = cookie.trim();
+            cookie.strip_prefix("session=").map(|v| v.to_owned())
+        })
+}
+
+/// Build a `Set-Cookie` header value for the session cookie.
+fn session_cookie(token: &str, max_age: i64, secure: bool) -> String {
+    let mut cookie = format!("session={token}; HttpOnly; SameSite=Lax; Path=/; Max-Age={max_age}");
+    if secure {
+        cookie.push_str("; Secure");
+    }
+    cookie
+}
+
+/// `GET /api/auth/login` — Redirect to Discord OAuth2 authorization page.
+pub async fn auth_login(
+    State(state): State<AppState>,
+    Extension(auth_config): Extension<AuthConfig>,
+    headers: HeaderMap,
+) -> Redirect {
+    let origin = resolve_origin(&auth_config, &headers);
+    let redirect_uri = format!("{origin}{CALLBACK_PATH}");
+    let csrf_state = state.oauth_state_store.generate(origin);
+    let redirect_uri_encoded = urlencoding::encode(&redirect_uri);
+
+    let url = format!(
+        "https://discord.com/oauth2/authorize\
+         ?client_id={}\
+         &redirect_uri={redirect_uri_encoded}\
+         &response_type=code\
+         &scope=identify\
+         &state={csrf_state}",
+        auth_config.client_id,
+    );
+
+    Redirect::temporary(&url)
+}
+
+/// `GET /api/auth/callback` — Handle Discord OAuth2 callback.
+pub async fn auth_callback(
+    State(state): State<AppState>,
+    Extension(auth_config): Extension<AuthConfig>,
+    Query(params): Query<CallbackParams>,
+) -> Result<Response, (StatusCode, Json<Value>)> {
+    // 1. Validate CSRF state and recover the origin used during login
+    let origin = state
+        .oauth_state_store
+        .validate(&params.state)
+        .ok_or_else(|| {
+            warn!("OAuth callback with invalid CSRF state");
+            (
+                StatusCode::BAD_REQUEST,
+                Json(json!({ "error": "Invalid OAuth state" })),
+            )
+        })?;
+
+    // 2. Exchange authorization code for access token
+    let redirect_uri = format!("{origin}{CALLBACK_PATH}");
+    let client = reqwest::Client::new();
+    let token_response = client
+        .post("https://discord.com/api/oauth2/token")
+        .form(&[
+            ("client_id", auth_config.client_id.as_str()),
+            ("client_secret", auth_config.client_secret.as_str()),
+            ("grant_type", "authorization_code"),
+            ("code", params.code.as_str()),
+            ("redirect_uri", redirect_uri.as_str()),
+        ])
+        .send()
+        .await
+        .map_err(|e| {
+            error!(error = %e, "failed to exchange OAuth code for token");
+            (
+                StatusCode::BAD_GATEWAY,
+                Json(json!({ "error": "Failed to exchange code with Discord" })),
+            )
+        })?;
+
+    if !token_response.status().is_success() {
+        let status = token_response.status();
+        let body = token_response.text().await.unwrap_or_default();
+        error!(%status, %body, "Discord token exchange returned error");
+        return Err((
+            StatusCode::BAD_GATEWAY,
+            Json(json!({ "error": "Discord token exchange failed" })),
+        ));
+    }
+
+    let token_data: TokenResponse = token_response.json().await.map_err(|e| {
+        error!(error = %e, "failed to parse Discord token response");
+        (
+            StatusCode::BAD_GATEWAY,
+            Json(json!({ "error": "Invalid token response from Discord" })),
+        )
+    })?;
+
+    // 3. Fetch Discord user profile
+    let discord_user: DiscordUser = client
+        .get("https://discord.com/api/users/@me")
+        .bearer_auth(&token_data.access_token)
+        .send()
+        .await
+        .map_err(|e| {
+            error!(error = %e, "failed to fetch Discord user profile");
+            (
+                StatusCode::BAD_GATEWAY,
+                Json(json!({ "error": "Failed to fetch Discord profile" })),
+            )
+        })?
+        .json()
+        .await
+        .map_err(|e| {
+            error!(error = %e, "failed to parse Discord user profile");
+            (
+                StatusCode::BAD_GATEWAY,
+                Json(json!({ "error": "Invalid user profile from Discord" })),
+            )
+        })?;
+
+    let discord_id: i64 = discord_user.id.parse().map_err(|_| {
+        error!(id = %discord_user.id, "Discord user ID is not a valid i64");
+        (
+            StatusCode::BAD_GATEWAY,
+            Json(json!({ "error": "Invalid Discord user ID" })),
+        )
+    })?;
+
+    // 4. Upsert user
+    let user = crate::data::users::upsert_user(
+        &state.db_pool,
+        discord_id,
+        &discord_user.username,
+        discord_user.avatar.as_deref(),
+    )
+    .await
+    .map_err(|e| {
+        error!(error = %e, "failed to upsert user");
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({ "error": "Database error" })),
+        )
+    })?;
+
+    info!(discord_id, username = %user.discord_username, "user authenticated via OAuth");
+
+    // 5. Create session
+    let session = crate::data::sessions::create_session(
+        &state.db_pool,
+        discord_id,
+        Duration::from_secs(7 * 24 * 3600),
+    )
+    .await
+    .map_err(|e| {
+        error!(error = %e, "failed to create session");
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({ "error": "Failed to create session" })),
+        )
+    })?;
+
+    // 6. Build response with session cookie
+    let secure = redirect_uri.starts_with("https://");
+    let cookie = session_cookie(&session.id, 604800, secure);
+
+    let redirect_to = if user.is_admin { "/admin" } else { "/" };
+
+    Ok((
+        [(header::SET_COOKIE, cookie)],
+        Redirect::temporary(redirect_to),
+    )
+        .into_response())
+}
+
+/// `POST /api/auth/logout` — Destroy the current session.
+pub async fn auth_logout(State(state): State<AppState>, headers: HeaderMap) -> Response {
+    if let Some(token) = extract_session_token(&headers) {
+        if let Err(e) = crate::data::sessions::delete_session(&state.db_pool, &token).await {
+            warn!(error = %e, "failed to delete session from database");
+        }
+        state.session_cache.evict(&token);
+    }
+
+    let cookie = session_cookie("", 0, false);
+
+    (
+        StatusCode::OK,
+        [(header::SET_COOKIE, cookie)],
+        Json(json!({ "ok": true })),
+    )
+        .into_response()
+}
+
+/// `GET /api/auth/me` — Return the current authenticated user's info.
+pub async fn auth_me(
+    State(state): State<AppState>,
+    headers: HeaderMap,
+) -> Result<Json<Value>, StatusCode> {
+    let token = extract_session_token(&headers).ok_or(StatusCode::UNAUTHORIZED)?;
+
+    let user = state
+        .session_cache
+        .get_user(&token)
+        .await
+        .ok_or(StatusCode::UNAUTHORIZED)?;
+
+    Ok(Json(json!({
+        "discordId": user.discord_id.to_string(),
+        "username": user.discord_username,
+        "avatarHash": user.discord_avatar_hash,
+        "isAdmin": user.is_admin,
+    })))
+}
@@ -0,0 +1,196 @@
+//! Content encoding negotiation for pre-compressed asset serving.
+//!
+//! Parses Accept-Encoding headers with quality values and returns
+//! supported encodings in priority order for content negotiation.
+
+use axum::http::{HeaderMap, HeaderValue, header};
+
+/// Minimum size threshold for compression (bytes).
+///
+/// Must match `MIN_SIZE` in `web/scripts/compress-assets.ts`.
+pub const COMPRESSION_MIN_SIZE: usize = 512;
+
+/// Supported content encodings in priority order (best compression first).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ContentEncoding {
+    Zstd,
+    Brotli,
+    Gzip,
+    Identity,
+}
+
+impl ContentEncoding {
+    /// File extension suffix for pre-compressed variant lookup.
+    #[inline]
+    pub fn extension(&self) -> &'static str {
+        match self {
+            Self::Zstd => ".zst",
+            Self::Brotli => ".br",
+            Self::Gzip => ".gz",
+            Self::Identity => "",
+        }
+    }
+
+    /// `Content-Encoding` header value, or `None` for identity.
+    #[inline]
+    pub fn header_value(&self) -> Option<HeaderValue> {
+        match self {
+            Self::Zstd => Some(HeaderValue::from_static("zstd")),
+            Self::Brotli => Some(HeaderValue::from_static("br")),
+            Self::Gzip => Some(HeaderValue::from_static("gzip")),
+            Self::Identity => None,
+        }
+    }
+
+    /// Default priority when quality values are equal (higher = better).
+    #[inline]
+    fn default_priority(&self) -> u8 {
+        match self {
+            Self::Zstd => 4,
+            Self::Brotli => 3,
+            Self::Gzip => 2,
+            Self::Identity => 1,
+        }
+    }
+}
+
+/// Parse `Accept-Encoding` header and return supported encodings in priority order.
+///
+/// Supports quality values: `Accept-Encoding: gzip;q=0.8, br;q=1.0, zstd`
+/// When quality values are equal: zstd > brotli > gzip > identity.
+/// Encodings with `q=0` are excluded.
+pub fn parse_accepted_encodings(headers: &HeaderMap) -> Vec<ContentEncoding> {
+    let Some(accept) = headers
+        .get(header::ACCEPT_ENCODING)
+        .and_then(|v| v.to_str().ok())
+    else {
+        return vec![ContentEncoding::Identity];
+    };
+
+    let mut encodings: Vec<(ContentEncoding, f32)> = Vec::new();
+
+    for part in accept.split(',') {
+        let part = part.trim();
+        if part.is_empty() {
+            continue;
+        }
+
+        let (encoding_str, quality) = if let Some((enc, params)) = part.split_once(';') {
+            let q = params
+                .split(';')
+                .find_map(|p| p.trim().strip_prefix("q="))
+                .and_then(|q| q.parse::<f32>().ok())
+                .unwrap_or(1.0);
+            (enc.trim(), q)
+        } else {
+            (part, 1.0)
+        };
+
+        if quality == 0.0 {
+            continue;
+        }
+
+        let encoding = match encoding_str.to_lowercase().as_str() {
+            "zstd" => ContentEncoding::Zstd,
+            "br" | "brotli" => ContentEncoding::Brotli,
+            "gzip" | "x-gzip" => ContentEncoding::Gzip,
+            "*" => ContentEncoding::Gzip,
+            "identity" => ContentEncoding::Identity,
+            _ => continue,
+        };
+
+        encodings.push((encoding, quality));
+    }
+
+    // Sort by quality (desc), then default priority (desc)
+    encodings.sort_by(|a, b| {
+        b.1.partial_cmp(&a.1)
+            .unwrap_or(std::cmp::Ordering::Equal)
+            .then_with(|| b.0.default_priority().cmp(&a.0.default_priority()))
+    });
+
+    if encodings.is_empty() {
+        vec![ContentEncoding::Identity]
+    } else {
+        encodings.into_iter().map(|(e, _)| e).collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_all_encodings() {
+        let mut headers = HeaderMap::new();
+        headers.insert(header::ACCEPT_ENCODING, "gzip, br, zstd".parse().unwrap());
+        let encodings = parse_accepted_encodings(&headers);
+        assert_eq!(encodings[0], ContentEncoding::Zstd);
+        assert_eq!(encodings[1], ContentEncoding::Brotli);
+        assert_eq!(encodings[2], ContentEncoding::Gzip);
+    }
+
+    #[test]
+    fn test_parse_with_quality_values() {
+        let mut headers = HeaderMap::new();
+        headers.insert(
+            header::ACCEPT_ENCODING,
+            "gzip;q=1.0, br;q=0.5, zstd;q=0.8".parse().unwrap(),
+        );
+        let encodings = parse_accepted_encodings(&headers);
+        assert_eq!(encodings[0], ContentEncoding::Gzip);
+        assert_eq!(encodings[1], ContentEncoding::Zstd);
+        assert_eq!(encodings[2], ContentEncoding::Brotli);
+    }
+
+    #[test]
+    fn test_no_header_returns_identity() {
+        let headers = HeaderMap::new();
+        let encodings = parse_accepted_encodings(&headers);
+        assert_eq!(encodings, vec![ContentEncoding::Identity]);
+    }
+
+    #[test]
+    fn test_disabled_encoding_excluded() {
+        let mut headers = HeaderMap::new();
+        headers.insert(
+            header::ACCEPT_ENCODING,
+            "zstd;q=0, br, gzip".parse().unwrap(),
+        );
+        let encodings = parse_accepted_encodings(&headers);
+        assert_eq!(encodings[0], ContentEncoding::Brotli);
+        assert_eq!(encodings[1], ContentEncoding::Gzip);
+        assert!(!encodings.contains(&ContentEncoding::Zstd));
+    }
+
+    #[test]
+    fn test_real_chrome_header() {
+        let mut headers = HeaderMap::new();
+        headers.insert(
+            header::ACCEPT_ENCODING,
+            "gzip, deflate, br, zstd".parse().unwrap(),
+        );
+        assert_eq!(parse_accepted_encodings(&headers)[0], ContentEncoding::Zstd);
+    }
+
+    #[test]
+    fn test_extensions() {
+        assert_eq!(ContentEncoding::Zstd.extension(), ".zst");
+        assert_eq!(ContentEncoding::Brotli.extension(), ".br");
+        assert_eq!(ContentEncoding::Gzip.extension(), ".gz");
+        assert_eq!(ContentEncoding::Identity.extension(), "");
+    }
+
+    #[test]
+    fn test_header_values() {
+        assert_eq!(
+            ContentEncoding::Zstd.header_value().unwrap(),
+            HeaderValue::from_static("zstd")
+        );
+        assert_eq!(
+            ContentEncoding::Brotli.header_value().unwrap(),
+            HeaderValue::from_static("br")
+        );
+        assert!(ContentEncoding::Identity.header_value().is_none());
+    }
+}
@@ -0,0 +1,74 @@
+//! Axum extractors for authentication and authorization.
+
+use axum::extract::FromRequestParts;
+use axum::http::{StatusCode, header};
+use axum::response::Json;
+use http::request::Parts;
+use serde_json::json;
+
+use crate::data::models::User;
+use crate::state::AppState;
+
+/// Extractor that resolves the session cookie to an authenticated [`User`].
+///
+/// Returns 401 if no valid session cookie is present.
+pub struct AuthUser(pub User);
+
+impl FromRequestParts<AppState> for AuthUser {
+    type Rejection = (StatusCode, Json<serde_json::Value>);
+
+    async fn from_request_parts(
+        parts: &mut Parts,
+        state: &AppState,
+    ) -> Result<Self, Self::Rejection> {
+        let token = parts
+            .headers
+            .get(header::COOKIE)
+            .and_then(|v| v.to_str().ok())
+            .and_then(|cookies| {
+                cookies
+                    .split(';')
+                    .find_map(|c| c.trim().strip_prefix("session=").map(|v| v.to_owned()))
+            })
+            .ok_or_else(|| {
+                (
+                    StatusCode::UNAUTHORIZED,
+                    Json(json!({"error": "unauthorized", "message": "No session cookie"})),
+                )
+            })?;
+
+        let user = state.session_cache.get_user(&token).await.ok_or_else(|| {
+            (
+                StatusCode::UNAUTHORIZED,
+                Json(json!({"error": "unauthorized", "message": "Invalid or expired session"})),
+            )
+        })?;
+
+        Ok(AuthUser(user))
+    }
+}
+
+/// Extractor that requires an authenticated admin user.
+///
+/// Returns 401 if not authenticated, 403 if not admin.
+pub struct AdminUser(pub User);
+
+impl FromRequestParts<AppState> for AdminUser {
+    type Rejection = (StatusCode, Json<serde_json::Value>);
+
+    async fn from_request_parts(
+        parts: &mut Parts,
+        state: &AppState,
+    ) -> Result<Self, Self::Rejection> {
+        let AuthUser(user) = AuthUser::from_request_parts(parts, state).await?;
+
+        if !user.is_admin {
+            return Err((
+                StatusCode::FORBIDDEN,
+                Json(json!({"error": "forbidden", "message": "Admin access required"})),
+            ));
+        }
+
+        Ok(AdminUser(user))
+    }
+}
@@ -1,7 +1,15 @@
 //! Web API module for the banner application.

+pub mod admin;
+pub mod admin_rmp;
 #[cfg(feature = "embed-assets")]
 pub mod assets;
+pub mod auth;
+#[cfg(feature = "embed-assets")]
+pub mod encoding;
+pub mod extractors;
 pub mod routes;
+pub mod session_cache;
+pub mod ws;

 pub use routes::*;
@@ -1,20 +1,23 @@
 //! Web API endpoints for Banner bot monitoring and metrics.

 use axum::{
-    Router,
+    Extension, Router,
    body::Body,
    extract::{Path, Query, Request, State},
    http::StatusCode as AxumStatusCode,
    response::{Json, Response},
-    routing::get,
+    routing::{get, post, put},
 };
+
+use crate::web::admin;
+use crate::web::admin_rmp;
+use crate::web::auth::{self, AuthConfig};
+use crate::web::ws;
 #[cfg(feature = "embed-assets")]
 use axum::{
-    http::{HeaderMap, HeaderValue, StatusCode, Uri},
-    response::{Html, IntoResponse},
+    http::{HeaderMap, StatusCode, Uri},
+    response::IntoResponse,
 };
-#[cfg(feature = "embed-assets")]
-use http::header;
 use serde::{Deserialize, Serialize};
 use serde_json::{Value, json};
 use std::{collections::BTreeMap, time::Duration};
@@ -24,51 +27,17 @@ use crate::state::AppState;
 use crate::status::ServiceStatus;
 #[cfg(not(feature = "embed-assets"))]
 use tower_http::cors::{Any, CorsLayer};
-use tower_http::{classify::ServerErrorsFailureClass, timeout::TimeoutLayer, trace::TraceLayer};
+use tower_http::{
+    classify::ServerErrorsFailureClass, compression::CompressionLayer, timeout::TimeoutLayer,
+    trace::TraceLayer,
+};
 use tracing::{Span, debug, trace, warn};

 #[cfg(feature = "embed-assets")]
-use crate::web::assets::{WebAssets, get_asset_metadata_cached};
-
-/// Set appropriate caching headers based on asset type
-#[cfg(feature = "embed-assets")]
-fn set_caching_headers(response: &mut Response, path: &str, etag: &str) {
-    let headers = response.headers_mut();
-
-    // Set ETag
-    if let Ok(etag_value) = HeaderValue::from_str(etag) {
-        headers.insert(header::ETAG, etag_value);
-    }
-
-    // Set Cache-Control based on asset type
-    let cache_control = if path.starts_with("assets/") {
-        // Static assets with hashed filenames - long-term cache
-        "public, max-age=31536000, immutable"
-    } else if path == "index.html" {
-        // HTML files - short-term cache
-        "public, max-age=300"
-    } else {
-        match path.split_once('.').map(|(_, extension)| extension) {
-            Some(ext) => match ext {
-                // CSS/JS files - medium-term cache
-                "css" | "js" => "public, max-age=86400",
-                // Images - long-term cache
-                "png" | "jpg" | "jpeg" | "gif" | "svg" | "ico" => "public, max-age=2592000",
-                // Default for other files
-                _ => "public, max-age=3600",
-            },
-            // Default for files without an extension
-            None => "public, max-age=3600",
-        }
-    };
-
-    if let Ok(cache_control_value) = HeaderValue::from_str(cache_control) {
-        headers.insert(header::CACHE_CONTROL, cache_control_value);
-    }
-}
+use crate::web::assets::try_serve_asset_with_encoding;

 /// Creates the web server router
-pub fn create_router(app_state: AppState) -> Router {
+pub fn create_router(app_state: AppState, auth_config: AuthConfig) -> Router {
    let api_router = Router::new()
        .route("/health", get(health))
        .route("/status", get(status))
@@ -78,9 +47,51 @@ pub fn create_router(app_state: AppState) -> Router {
        .route("/terms", get(get_terms))
        .route("/subjects", get(get_subjects))
        .route("/reference/{category}", get(get_reference))
+        .with_state(app_state.clone());
+
+    let auth_router = Router::new()
+        .route("/auth/login", get(auth::auth_login))
+        .route("/auth/callback", get(auth::auth_callback))
+        .route("/auth/logout", post(auth::auth_logout))
+        .route("/auth/me", get(auth::auth_me))
+        .layer(Extension(auth_config))
+        .with_state(app_state.clone());
+
+    let admin_router = Router::new()
+        .route("/admin/status", get(admin::admin_status))
+        .route("/admin/users", get(admin::list_users))
+        .route(
+            "/admin/users/{discord_id}/admin",
+            put(admin::set_user_admin),
+        )
+        .route("/admin/scrape-jobs", get(admin::list_scrape_jobs))
+        .route("/admin/scrape-jobs/ws", get(ws::scrape_jobs_ws))
+        .route("/admin/audit-log", get(admin::list_audit_log))
+        .route("/admin/instructors", get(admin_rmp::list_instructors))
+        .route("/admin/instructors/{id}", get(admin_rmp::get_instructor))
+        .route(
+            "/admin/instructors/{id}/match",
+            post(admin_rmp::match_instructor),
+        )
+        .route(
+            "/admin/instructors/{id}/reject-candidate",
+            post(admin_rmp::reject_candidate),
+        )
+        .route(
+            "/admin/instructors/{id}/reject-all",
+            post(admin_rmp::reject_all),
+        )
+        .route(
+            "/admin/instructors/{id}/unmatch",
+            post(admin_rmp::unmatch_instructor),
+        )
+        .route("/admin/rmp/rescore", post(admin_rmp::rescore))
        .with_state(app_state);

-    let mut router = Router::new().nest("/api", api_router);
+    let mut router = Router::new()
+        .nest("/api", api_router)
+        .nest("/api", auth_router)
+        .nest("/api", admin_router);

    // When embed-assets feature is enabled, serve embedded static assets
    #[cfg(feature = "embed-assets")]
@@ -100,6 +111,13 @@ pub fn create_router(app_state: AppState) -> Router {
    }

    router.layer((
+        // Compress API responses (gzip/brotli/zstd). Pre-compressed static
+        // assets already have Content-Encoding set, so tower-http skips them.
+        CompressionLayer::new()
+            .zstd(true)
+            .br(true)
+            .gzip(true)
+            .quality(tower_http::CompressionLevel::Fastest),
        TraceLayer::new_for_http()
            .make_span_with(|request: &Request<Body>| {
                tracing::debug_span!("request", path = request.uri().path())
@@ -146,71 +164,35 @@ pub fn create_router(app_state: AppState) -> Router {
    ))
 }

-/// Handler that extracts request information for caching
+/// SPA fallback handler with content encoding negotiation.
+///
+/// Serves embedded static assets with pre-compressed variants when available,
+/// falling back to `index.html` for SPA client-side routing.
 #[cfg(feature = "embed-assets")]
-async fn fallback(request: Request) -> Response {
+async fn fallback(request: Request) -> axum::response::Response {
    let uri = request.uri().clone();
    let headers = request.headers().clone();
-    handle_spa_fallback_with_headers(uri, headers).await
+    handle_spa_fallback(uri, headers).await
 }

-/// Handles SPA routing by serving index.html for non-API, non-asset requests
-/// This version includes HTTP caching headers and ETag support
 #[cfg(feature = "embed-assets")]
-async fn handle_spa_fallback_with_headers(uri: Uri, request_headers: HeaderMap) -> Response {
-    let path = uri.path().trim_start_matches('/');
-
-    if let Some(content) = WebAssets::get(path) {
-        // Get asset metadata (MIME type and hash) with caching
-        let metadata = get_asset_metadata_cached(path, &content.data);
-
-        // Check if client has a matching ETag (conditional request)
-        if let Some(etag) = request_headers.get(header::IF_NONE_MATCH)
-            && etag.to_str().is_ok_and(|s| metadata.etag_matches(s))
-        {
-            return StatusCode::NOT_MODIFIED.into_response();
-        }
-
-        // Use cached MIME type, only set Content-Type if we have a valid MIME type
-        let mut response = (
-            [(
-                header::CONTENT_TYPE,
-                // For unknown types, set to application/octet-stream
-                metadata
-                    .mime_type
-                    .unwrap_or("application/octet-stream".to_string()),
-            )],
-            content.data,
-        )
-            .into_response();
-
-        // Set caching headers
-        set_caching_headers(&mut response, path, &metadata.hash.quoted());
+async fn handle_spa_fallback(uri: Uri, request_headers: HeaderMap) -> axum::response::Response {
+    let path = uri.path();

+    // Try serving the exact asset (with encoding negotiation)
+    if let Some(response) = try_serve_asset_with_encoding(path, &request_headers) {
        return response;
-    } else {
-        // Any assets that are not found should be treated as a 404, not falling back to the SPA index.html
-        if path.starts_with("assets/") {
-            return (StatusCode::NOT_FOUND, "Asset not found").into_response();
-        }
    }

-    // Fall back to the SPA index.html
-    match WebAssets::get("index.html") {
-        Some(content) => {
-            let metadata = get_asset_metadata_cached("index.html", &content.data);
+    // SvelteKit assets under _app/ that don't exist are a hard 404
+    let trimmed = path.trim_start_matches('/');
+    if trimmed.starts_with("_app/") || trimmed.starts_with("assets/") {
+        return (StatusCode::NOT_FOUND, "Asset not found").into_response();
+    }

-            // Check if client has a matching ETag for index.html
-            if let Some(etag) = request_headers.get(header::IF_NONE_MATCH)
-                && etag.to_str().is_ok_and(|s| metadata.etag_matches(s))
-            {
-                return StatusCode::NOT_MODIFIED.into_response();
-            }
-
-            let mut response = Html(content.data).into_response();
-            set_caching_headers(&mut response, "index.html", &metadata.hash.quoted());
-            response
-        }
+    // SPA fallback: serve index.html with encoding negotiation
+    match try_serve_asset_with_encoding("/index.html", &request_headers) {
+        Some(response) => response,
        None => (
            StatusCode::INTERNAL_SERVER_ERROR,
            "Failed to load index.html",
@@ -284,24 +266,140 @@ async fn status(State(state): State<AppState>) -> Json<StatusResponse> {
 }

 /// Metrics endpoint for monitoring
-async fn metrics() -> Json<Value> {
-    // For now, return basic metrics structure
-    Json(json!({
-        "banner_api": {
-            "status": "connected"
-        },
-        "timestamp": chrono::Utc::now().to_rfc3339()
-    }))
+async fn metrics(
+    State(state): State<AppState>,
+    Query(params): Query<MetricsParams>,
+) -> Result<Json<Value>, (AxumStatusCode, String)> {
+    let limit = params.limit.clamp(1, 5000);
+
+    // Parse range shorthand, defaulting to 24h
+    let range_str = params.range.as_deref().unwrap_or("24h");
+    let duration = match range_str {
+        "1h" => chrono::Duration::hours(1),
+        "6h" => chrono::Duration::hours(6),
+        "24h" => chrono::Duration::hours(24),
+        "7d" => chrono::Duration::days(7),
+        "30d" => chrono::Duration::days(30),
+        _ => {
+            return Err((
+                AxumStatusCode::BAD_REQUEST,
+                format!("Invalid range '{range_str}'. Valid: 1h, 6h, 24h, 7d, 30d"),
+            ));
+        }
+    };
+    let since = chrono::Utc::now() - duration;
+
+    // Resolve course_id: explicit param takes priority, then term+crn lookup
+    let course_id = if let Some(id) = params.course_id {
+        Some(id)
+    } else if let (Some(term), Some(crn)) = (params.term.as_deref(), params.crn.as_deref()) {
+        let row: Option<(i32,)> =
+            sqlx::query_as("SELECT id FROM courses WHERE term_code = $1 AND crn = $2")
+                .bind(term)
+                .bind(crn)
+                .fetch_optional(&state.db_pool)
+                .await
+                .map_err(|e| {
+                    tracing::error!(error = %e, "Course lookup for metrics failed");
+                    (
+                        AxumStatusCode::INTERNAL_SERVER_ERROR,
+                        "Course lookup failed".to_string(),
+                    )
+                })?;
+        row.map(|(id,)| id)
+    } else {
+        None
+    };
+
+    // Build query dynamically based on filters
+    let metrics: Vec<(i32, i32, chrono::DateTime<chrono::Utc>, i32, i32, i32)> =
+        if let Some(cid) = course_id {
+            sqlx::query_as(
+                "SELECT id, course_id, timestamp, enrollment, wait_count, seats_available \
+             FROM course_metrics \
+             WHERE course_id = $1 AND timestamp >= $2 \
+             ORDER BY timestamp DESC \
+             LIMIT $3",
+            )
+            .bind(cid)
+            .bind(since)
+            .bind(limit)
+            .fetch_all(&state.db_pool)
+            .await
+        } else {
+            sqlx::query_as(
+                "SELECT id, course_id, timestamp, enrollment, wait_count, seats_available \
+             FROM course_metrics \
+             WHERE timestamp >= $1 \
+             ORDER BY timestamp DESC \
+             LIMIT $2",
+            )
+            .bind(since)
+            .bind(limit)
+            .fetch_all(&state.db_pool)
+            .await
+        }
+        .map_err(|e| {
+            tracing::error!(error = %e, "Metrics query failed");
+            (
+                AxumStatusCode::INTERNAL_SERVER_ERROR,
+                "Metrics query failed".to_string(),
+            )
+        })?;
+
+    let count = metrics.len();
+    let metrics_json: Vec<Value> = metrics
+        .into_iter()
+        .map(
+            |(id, course_id, timestamp, enrollment, wait_count, seats_available)| {
+                json!({
+                    "id": id,
+                    "courseId": course_id,
+                    "timestamp": timestamp.to_rfc3339(),
+                    "enrollment": enrollment,
+                    "waitCount": wait_count,
+                    "seatsAvailable": seats_available,
+                })
+            },
+        )
+        .collect();
+
+    Ok(Json(json!({
+        "metrics": metrics_json,
+        "count": count,
+        "timestamp": chrono::Utc::now().to_rfc3339(),
+    })))
 }

 // ============================================================
 // Course search & detail API
 // ============================================================

+#[derive(Deserialize)]
+struct MetricsParams {
+    course_id: Option<i32>,
+    term: Option<String>,
+    crn: Option<String>,
+    /// Shorthand durations: "1h", "6h", "24h", "7d", "30d"
+    range: Option<String>,
+    #[serde(default = "default_metrics_limit")]
+    limit: i32,
+}
+
+fn default_metrics_limit() -> i32 {
+    500
+}
+
+#[derive(Deserialize)]
+struct SubjectsParams {
+    term: String,
+}
+
 #[derive(Deserialize)]
 struct SearchParams {
    term: String,
-    subject: Option<String>,
+    #[serde(default)]
+    subject: Vec<String>,
    q: Option<String>,
    course_number_low: Option<i32>,
    course_number_high: Option<i32>,
@@ -317,59 +415,12 @@ struct SearchParams {
    sort_dir: Option<SortDirection>,
 }

-#[derive(Debug, Clone, Copy, Deserialize)]
-#[serde(rename_all = "snake_case")]
-enum SortColumn {
-    CourseCode,
-    Title,
-    Instructor,
-    Time,
-    Seats,
-}
-
-#[derive(Debug, Clone, Copy, Deserialize)]
-#[serde(rename_all = "snake_case")]
-enum SortDirection {
-    Asc,
-    Desc,
-}
+use crate::data::courses::{SortColumn, SortDirection};

 fn default_limit() -> i32 {
    25
 }

-/// Build a safe ORDER BY clause from the validated sort column and direction.
-fn sort_clause(column: Option<SortColumn>, direction: Option<SortDirection>) -> String {
-    let dir = match direction.unwrap_or(SortDirection::Asc) {
-        SortDirection::Asc => "ASC",
-        SortDirection::Desc => "DESC",
-    };
-
-    match column {
-        Some(SortColumn::CourseCode) => {
-            format!("subject {dir}, course_number {dir}, sequence_number {dir}")
-        }
-        Some(SortColumn::Title) => format!("title {dir}"),
-        Some(SortColumn::Instructor) => {
-            // Sort by primary instructor display name via a subquery
-            format!(
-                "(SELECT i.display_name FROM course_instructors ci \
-                 JOIN instructors i ON i.banner_id = ci.instructor_id \
-                 WHERE ci.course_id = courses.id AND ci.is_primary = true \
-                 LIMIT 1) {dir} NULLS LAST"
-            )
-        }
-        Some(SortColumn::Time) => {
-            // Sort by first meeting time's begin_time via JSONB
-            format!("(meeting_times->0->>'begin_time') {dir} NULLS LAST")
-        }
-        Some(SortColumn::Seats) => {
-            format!("(max_enrollment - enrollment) {dir}")
-        }
-        None => "subject ASC, course_number ASC, sequence_number ASC".to_string(),
-    }
-}
-
 #[derive(Serialize, TS)]
 #[serde(rename_all = "camelCase")]
 #[ts(export)]
@@ -404,12 +455,14 @@ pub struct CourseResponse {
 #[serde(rename_all = "camelCase")]
 #[ts(export)]
 pub struct InstructorResponse {
+    instructor_id: i32,
    banner_id: String,
    display_name: String,
-    email: Option<String>,
+    email: String,
    is_primary: bool,
    rmp_rating: Option<f32>,
    rmp_num_ratings: Option<i32>,
+    rmp_legacy_id: Option<i32>,
 }

 #[derive(Serialize, TS)]
@@ -430,27 +483,23 @@ pub struct CodeDescription {
    description: String,
 }

-/// Build a `CourseResponse` from a DB course, fetching its instructors.
-async fn build_course_response(
+/// Build a `CourseResponse` from a DB course with pre-fetched instructor details.
+fn build_course_response(
    course: &crate::data::models::Course,
-    db_pool: &sqlx::PgPool,
+    instructors: Vec<crate::data::models::CourseInstructorDetail>,
 ) -> CourseResponse {
-    let instructors = crate::data::courses::get_course_instructors(db_pool, course.id)
-        .await
-        .unwrap_or_default()
+    let instructors = instructors
        .into_iter()
-        .map(
-            |(banner_id, display_name, email, is_primary, rmp_rating, rmp_num_ratings)| {
-                InstructorResponse {
-                    banner_id,
-                    display_name,
-                    email,
-                    is_primary,
-                    rmp_rating,
-                    rmp_num_ratings,
-                }
-            },
-        )
+        .map(|i| InstructorResponse {
+            instructor_id: i.instructor_id,
+            banner_id: i.banner_id,
+            display_name: i.display_name,
+            email: i.email,
+            is_primary: i.is_primary,
+            rmp_rating: i.avg_rating,
+            rmp_num_ratings: i.num_ratings,
+            rmp_legacy_id: i.rmp_legacy_id,
+        })
        .collect();

    CourseResponse {
@@ -484,17 +533,19 @@ async fn build_course_response(
 /// `GET /api/courses/search`
 async fn search_courses(
    State(state): State<AppState>,
-    Query(params): Query<SearchParams>,
+    axum_extra::extract::Query(params): axum_extra::extract::Query<SearchParams>,
 ) -> Result<Json<SearchResponse>, (AxumStatusCode, String)> {
    let limit = params.limit.clamp(1, 100);
    let offset = params.offset.max(0);

-    let order_by = sort_clause(params.sort_by, params.sort_dir);
-
    let (courses, total_count) = crate::data::courses::search_courses(
        &state.db_pool,
        &params.term,
-        params.subject.as_deref(),
+        if params.subject.is_empty() {
+            None
+        } else {
+            Some(&params.subject)
+        },
        params.q.as_deref(),
        params.course_number_low,
        params.course_number_high,
@@ -503,7 +554,8 @@ async fn search_courses(
        params.campus.as_deref(),
        limit,
        offset,
-        &order_by,
+        params.sort_by,
+        params.sort_dir,
    )
    .await
    .map_err(|e| {
@@ -514,10 +566,20 @@ async fn search_courses(
        )
    })?;

-    let mut course_responses = Vec::with_capacity(courses.len());
-    for course in &courses {
-        course_responses.push(build_course_response(course, &state.db_pool).await);
-    }
+    // Batch-fetch all instructors in a single query instead of N+1
+    let course_ids: Vec<i32> = courses.iter().map(|c| c.id).collect();
+    let mut instructor_map =
+        crate::data::courses::get_instructors_for_courses(&state.db_pool, &course_ids)
+            .await
+            .unwrap_or_default();
+
+    let course_responses: Vec<CourseResponse> = courses
+        .iter()
+        .map(|course| {
+            let instructors = instructor_map.remove(&course.id).unwrap_or_default();
+            build_course_response(course, instructors)
+        })
+        .collect();

    Ok(Json(SearchResponse {
        courses: course_responses,
@@ -543,7 +605,10 @@ async fn get_course(
        })?
        .ok_or_else(|| (AxumStatusCode::NOT_FOUND, "Course not found".to_string()))?;

-    Ok(Json(build_course_response(&course, &state.db_pool).await))
+    let instructors = crate::data::courses::get_course_instructors(&state.db_pool, course.id)
+        .await
+        .unwrap_or_default();
+    Ok(Json(build_course_response(&course, instructors)))
 }

 /// `GET /api/terms`
@@ -575,19 +640,24 @@ async fn get_terms(
    Ok(Json(terms))
 }

-/// `GET /api/subjects?term=202420`
+/// `GET /api/subjects?term=202620`
 async fn get_subjects(
    State(state): State<AppState>,
+    Query(params): Query<SubjectsParams>,
 ) -> Result<Json<Vec<CodeDescription>>, (AxumStatusCode, String)> {
-    let cache = state.reference_cache.read().await;
-    let entries = cache.entries_for_category("subject");
+    let rows = crate::data::courses::get_subjects_by_enrollment(&state.db_pool, &params.term)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "Failed to get subjects");
+            (
+                AxumStatusCode::INTERNAL_SERVER_ERROR,
+                "Failed to get subjects".to_string(),
+            )
+        })?;

-    let subjects: Vec<CodeDescription> = entries
+    let subjects: Vec<CodeDescription> = rows
        .into_iter()
-        .map(|(code, description)| CodeDescription {
-            code: code.to_string(),
-            description: description.to_string(),
-        })
+        .map(|(code, description, _enrollment)| CodeDescription { code, description })
        .collect();

    Ok(Json(subjects))
@@ -0,0 +1,188 @@
+//! In-memory caches for session resolution and OAuth CSRF state.
+
+use chrono::{DateTime, Utc};
+use dashmap::DashMap;
+use rand::Rng;
+use sqlx::PgPool;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+use crate::data::models::User;
+
+/// Cached session entry with TTL.
+#[derive(Debug, Clone)]
+struct CachedSession {
+    user: User,
+    session_expires_at: DateTime<Utc>,
+    cached_at: Instant,
+}
+
+/// In-memory session cache backed by PostgreSQL.
+///
+/// Provides fast session resolution without a DB round-trip on every request.
+/// Cache entries expire after a configurable TTL (default 5 minutes).
+#[derive(Clone)]
+pub struct SessionCache {
+    cache: Arc<DashMap<String, CachedSession>>,
+    db_pool: PgPool,
+    cache_ttl: Duration,
+}
+
+impl SessionCache {
+    /// Create a new session cache with a 5-minute default TTL.
+    pub fn new(db_pool: PgPool) -> Self {
+        Self {
+            cache: Arc::new(DashMap::new()),
+            db_pool,
+            cache_ttl: Duration::from_secs(5 * 60),
+        }
+    }
+
+    /// Resolve a session token to a [`User`], using the cache when possible.
+    ///
+    /// On cache hit (entry present, not stale, session not expired), returns the
+    /// cached user immediately. On miss or stale entry, queries the database for
+    /// the session and user, populates the cache, and fire-and-forgets a
+    /// `touch_session` call to update `last_active_at`.
+    pub async fn get_user(&self, token: &str) -> Option<User> {
+        // Check cache first
+        if let Some(entry) = self.cache.get(token) {
+            let now_instant = Instant::now();
+            let now_utc = Utc::now();
+
+            let cache_fresh = entry.cached_at + self.cache_ttl > now_instant;
+            let session_valid = entry.session_expires_at > now_utc;
+
+            if cache_fresh && session_valid {
+                return Some(entry.user.clone());
+            }
+
+            // Stale or expired — drop the ref before removing
+            drop(entry);
+            self.cache.remove(token);
+        }
+
+        // Cache miss — query DB
+        let session = crate::data::sessions::get_session(&self.db_pool, token)
+            .await
+            .ok()
+            .flatten()?;
+
+        let user = crate::data::users::get_user(&self.db_pool, session.user_id)
+            .await
+            .ok()
+            .flatten()?;
+
+        self.cache.insert(
+            token.to_owned(),
+            CachedSession {
+                user: user.clone(),
+                session_expires_at: session.expires_at,
+                cached_at: Instant::now(),
+            },
+        );
+
+        // Fire-and-forget touch to update last_active_at
+        let pool = self.db_pool.clone();
+        let token_owned = token.to_owned();
+        tokio::spawn(async move {
+            if let Err(e) = crate::data::sessions::touch_session(&pool, &token_owned).await {
+                tracing::warn!(error = %e, "failed to touch session");
+            }
+        });
+
+        Some(user)
+    }
+
+    /// Remove a single session from the cache (e.g. on logout).
+    pub fn evict(&self, token: &str) {
+        self.cache.remove(token);
+    }
+
+    /// Remove all cached sessions belonging to a user.
+    pub fn evict_user(&self, discord_id: i64) {
+        self.cache
+            .retain(|_, entry| entry.user.discord_id != discord_id);
+    }
+
+    /// Delete expired sessions from the database and sweep the in-memory cache.
+    ///
+    /// Returns the number of sessions deleted from the database.
+    #[allow(dead_code)] // Intended for periodic cleanup task (not yet wired)
+    pub async fn cleanup_expired(&self) -> anyhow::Result<u64> {
+        let deleted = crate::data::sessions::cleanup_expired(&self.db_pool).await?;
+
+        let now = Utc::now();
+        self.cache.retain(|_, entry| entry.session_expires_at > now);
+
+        Ok(deleted)
+    }
+}
+
+/// Data stored alongside each OAuth CSRF state token.
+struct OAuthStateEntry {
+    created_at: Instant,
+    /// The browser origin that initiated the login flow, so the callback
+    /// can reconstruct the exact redirect_uri Discord expects.
+    origin: String,
+}
+
+/// Ephemeral store for OAuth CSRF state tokens.
+///
+/// Tokens are stored with creation time and expire after a configurable TTL.
+/// Each token is single-use: validation consumes it.
+#[derive(Clone)]
+pub struct OAuthStateStore {
+    states: Arc<DashMap<String, OAuthStateEntry>>,
+    ttl: Duration,
+}
+
+impl Default for OAuthStateStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl OAuthStateStore {
+    /// Create a new store with a 10-minute TTL.
+    pub fn new() -> Self {
+        Self {
+            states: Arc::new(DashMap::new()),
+            ttl: Duration::from_secs(10 * 60),
+        }
+    }
+
+    /// Generate a random 16-byte hex CSRF token, store it with the given
+    /// origin, and return the token.
+    pub fn generate(&self, origin: String) -> String {
+        let bytes: [u8; 16] = rand::rng().random();
+        let token: String = bytes.iter().map(|b| format!("{b:02x}")).collect();
+        self.states.insert(
+            token.clone(),
+            OAuthStateEntry {
+                created_at: Instant::now(),
+                origin,
+            },
+        );
+        token
+    }
+
+    /// Validate and consume a CSRF token. Returns the stored origin if the
+    /// token was present and not expired.
+    pub fn validate(&self, state: &str) -> Option<String> {
+        let (_, entry) = self.states.remove(state)?;
+        if entry.created_at.elapsed() < self.ttl {
+            Some(entry.origin)
+        } else {
+            None
+        }
+    }
+
+    /// Remove all expired entries from the store.
+    #[allow(dead_code)] // Intended for periodic cleanup task (not yet wired)
+    pub fn cleanup(&self) {
+        let ttl = self.ttl;
+        self.states
+            .retain(|_, entry| entry.created_at.elapsed() < ttl);
+    }
+}
@@ -0,0 +1,205 @@
+//! WebSocket event types and handler for real-time scrape job updates.
+
+use axum::{
+    extract::{
+        State,
+        ws::{Message, WebSocket, WebSocketUpgrade},
+    },
+    response::IntoResponse,
+};
+use futures::{SinkExt, StreamExt};
+use serde::Serialize;
+use sqlx::PgPool;
+use tokio::sync::broadcast;
+use tracing::debug;
+
+use crate::data::models::{ScrapeJob, ScrapeJobStatus};
+use crate::state::AppState;
+use crate::web::extractors::AdminUser;
+
+/// A serializable DTO for `ScrapeJob` with computed `status`.
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ScrapeJobDto {
+    pub id: i32,
+    pub target_type: String,
+    pub target_payload: serde_json::Value,
+    pub priority: String,
+    pub execute_at: String,
+    pub created_at: String,
+    pub locked_at: Option<String>,
+    pub retry_count: i32,
+    pub max_retries: i32,
+    pub queued_at: String,
+    pub status: ScrapeJobStatus,
+}
+
+impl From<&ScrapeJob> for ScrapeJobDto {
+    fn from(job: &ScrapeJob) -> Self {
+        Self {
+            id: job.id,
+            target_type: format!("{:?}", job.target_type),
+            target_payload: job.target_payload.clone(),
+            priority: format!("{:?}", job.priority),
+            execute_at: job.execute_at.to_rfc3339(),
+            created_at: job.created_at.to_rfc3339(),
+            locked_at: job.locked_at.map(|t| t.to_rfc3339()),
+            retry_count: job.retry_count,
+            max_retries: job.max_retries,
+            queued_at: job.queued_at.to_rfc3339(),
+            status: job.status(),
+        }
+    }
+}
+
+/// Events broadcast when scrape job state changes.
+#[derive(Debug, Clone, Serialize)]
+#[serde(tag = "type", rename_all = "camelCase")]
+pub enum ScrapeJobEvent {
+    Init {
+        jobs: Vec<ScrapeJobDto>,
+    },
+    JobCreated {
+        job: ScrapeJobDto,
+    },
+    JobLocked {
+        id: i32,
+        locked_at: String,
+        status: ScrapeJobStatus,
+    },
+    JobCompleted {
+        id: i32,
+    },
+    JobRetried {
+        id: i32,
+        retry_count: i32,
+        queued_at: String,
+        status: ScrapeJobStatus,
+    },
+    JobExhausted {
+        id: i32,
+    },
+    JobDeleted {
+        id: i32,
+    },
+}
+
+/// Fetch current scrape jobs from the DB and build an `Init` event.
+async fn build_init_event(db_pool: &PgPool) -> Result<ScrapeJobEvent, sqlx::Error> {
+    let rows = sqlx::query_as::<_, ScrapeJob>(
+        "SELECT * FROM scrape_jobs ORDER BY priority DESC, execute_at ASC LIMIT 100",
+    )
+    .fetch_all(db_pool)
+    .await?;
+
+    let jobs = rows.iter().map(ScrapeJobDto::from).collect();
+    Ok(ScrapeJobEvent::Init { jobs })
+}
+
+/// WebSocket endpoint for real-time scrape job updates.
+///
+/// Auth is checked via `AdminUser` before the upgrade occurs — if rejected,
+/// a 401/403 is returned and the upgrade never happens.
+pub async fn scrape_jobs_ws(
+    ws: WebSocketUpgrade,
+    AdminUser(_user): AdminUser,
+    State(state): State<AppState>,
+) -> impl IntoResponse {
+    ws.on_upgrade(|socket| handle_scrape_jobs_ws(socket, state))
+}
+
+/// Serialize an event and send it over the WebSocket sink.
+/// Returns `true` if the message was sent, `false` if the client disconnected.
+async fn send_event(
+    sink: &mut futures::stream::SplitSink<WebSocket, Message>,
+    event: &ScrapeJobEvent,
+) -> bool {
+    let Ok(json) = serde_json::to_string(event) else {
+        return true; // serialization failed, but connection is still alive
+    };
+    sink.send(Message::Text(json.into())).await.is_ok()
+}
+
+async fn handle_scrape_jobs_ws(socket: WebSocket, state: AppState) {
+    debug!("scrape-jobs WebSocket connected");
+
+    let (mut sink, mut stream) = socket.split();
+
+    // Send initial state
+    let init_event = match build_init_event(&state.db_pool).await {
+        Ok(event) => event,
+        Err(e) => {
+            debug!(error = %e, "failed to build init event, closing WebSocket");
+            return;
+        }
+    };
+    if !send_event(&mut sink, &init_event).await {
+        debug!("client disconnected during init send");
+        return;
+    }
+
+    // Subscribe to broadcast events
+    let mut rx = state.scrape_job_events();
+
+    loop {
+        tokio::select! {
+            result = rx.recv() => {
+                match result {
+                    Ok(ref event) => {
+                        if !send_event(&mut sink, event).await {
+                            debug!("client disconnected during event send");
+                            break;
+                        }
+                    }
+                    Err(broadcast::error::RecvError::Lagged(n)) => {
+                        debug!(missed = n, "broadcast lagged, resyncing");
+                        match build_init_event(&state.db_pool).await {
+                            Ok(ref event) => {
+                                if !send_event(&mut sink, event).await {
+                                    debug!("client disconnected during resync send");
+                                    break;
+                                }
+                            }
+                            Err(e) => {
+                                debug!(error = %e, "failed to build resync init event");
+                            }
+                        }
+                    }
+                    Err(broadcast::error::RecvError::Closed) => {
+                        debug!("broadcast channel closed");
+                        break;
+                    }
+                }
+            }
+            msg = stream.next() => {
+                match msg {
+                    Some(Ok(Message::Text(text))) => {
+                        if let Ok(parsed) = serde_json::from_str::<serde_json::Value>(&text)
+                            && parsed.get("type").and_then(|t| t.as_str()) == Some("resync")
+                        {
+                            debug!("client requested resync");
+                            match build_init_event(&state.db_pool).await {
+                                Ok(ref event) => {
+                                    if !send_event(&mut sink, event).await {
+                                        debug!("client disconnected during resync send");
+                                        break;
+                                    }
+                                }
+                                Err(e) => {
+                                    debug!(error = %e, "failed to build resync init event");
+                                }
+                            }
+                        }
+                    }
+                    Some(Ok(Message::Close(_))) | None => {
+                        debug!("client disconnected");
+                        break;
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+
+    debug!("scrape-jobs WebSocket disconnected");
+}
@@ -210,3 +210,116 @@ async fn test_batch_upsert_unique_constraint_crn_term(pool: PgPool) {
    assert_eq!(rows[1].0, "202520");
    assert_eq!(rows[1].1, 10);
 }
+
+#[sqlx::test]
+async fn test_batch_upsert_creates_audit_and_metric_entries(pool: PgPool) {
+    // Insert initial data — should NOT create audits/metrics (it's a fresh insert)
+    let initial = vec![helpers::make_course(
+        "50001",
+        "202510",
+        "CS",
+        "3443",
+        "App Programming",
+        10,
+        35,
+        0,
+        5,
+    )];
+    batch_upsert_courses(&initial, &pool).await.unwrap();
+
+    let (audit_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_audits")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert_eq!(
+        audit_count, 0,
+        "initial insert should not create audit entries"
+    );
+
+    let (metric_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_metrics")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert_eq!(
+        metric_count, 0,
+        "initial insert should not create metric entries"
+    );
+
+    // Update enrollment and wait_count
+    let updated = vec![helpers::make_course(
+        "50001",
+        "202510",
+        "CS",
+        "3443",
+        "App Programming",
+        20,
+        35,
+        2,
+        5,
+    )];
+    batch_upsert_courses(&updated, &pool).await.unwrap();
+
+    // Should have audit entries for enrollment and wait_count changes
+    let (audit_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_audits")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert!(
+        audit_count >= 2,
+        "should have audit entries for enrollment and wait_count changes, got {audit_count}"
+    );
+
+    // Should have exactly 1 metric entry
+    let (metric_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_metrics")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert_eq!(metric_count, 1, "should have 1 metric snapshot");
+
+    // Verify metric values
+    let (enrollment, wait_count, seats): (i32, i32, i32) = sqlx::query_as(
+        "SELECT enrollment, wait_count, seats_available FROM course_metrics LIMIT 1",
+    )
+    .fetch_one(&pool)
+    .await
+    .unwrap();
+    assert_eq!(enrollment, 20);
+    assert_eq!(wait_count, 2);
+    assert_eq!(seats, 15); // 35 - 20
+}
+
+#[sqlx::test]
+async fn test_batch_upsert_no_change_no_audit(pool: PgPool) {
+    // Insert then re-insert identical data — should produce zero audits/metrics
+    let course = vec![helpers::make_course(
+        "60001",
+        "202510",
+        "CS",
+        "1083",
+        "Intro to CS",
+        25,
+        30,
+        0,
+        5,
+    )];
+    batch_upsert_courses(&course, &pool).await.unwrap();
+    batch_upsert_courses(&course, &pool).await.unwrap();
+
+    let (audit_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_audits")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert_eq!(
+        audit_count, 0,
+        "identical re-upsert should not create audit entries"
+    );
+
+    let (metric_count,): (i64,) = sqlx::query_as("SELECT COUNT(*) FROM course_metrics")
+        .fetch_one(&pool)
+        .await
+        .unwrap();
+    assert_eq!(
+        metric_count, 0,
+        "identical re-upsert should not create metric entries"
+    );
+}
@@ -217,10 +217,13 @@ async fn unlock_and_increment_retry_has_retries_remaining(pool: PgPool) {
    )
    .await;

-    let has_retries = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
+    let result = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
        .await
        .unwrap();
-    assert!(has_retries, "should have retries remaining (0→1, max=3)");
+    assert!(
+        result.is_some(),
+        "should have retries remaining (0→1, max=3)"
+    );

    // Verify state in DB
    let (retry_count, locked_at): (i32, Option<chrono::DateTime<chrono::Utc>>) =
@@ -241,17 +244,17 @@ async fn unlock_and_increment_retry_exhausted(pool: PgPool) {
        json!({"subject": "CS"}),
        ScrapePriority::Medium,
        true,
-        2, // retry_count
+        3, // retry_count (already used all 3 retries)
        3, // max_retries
    )
    .await;

-    let has_retries = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
+    let result = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
        .await
        .unwrap();
    assert!(
-        !has_retries,
-        "should NOT have retries remaining (2→3, max=3)"
+        result.is_none(),
+        "should NOT have retries remaining (3→4, max=3)"
    );

    let (retry_count,): (i32,) =
@@ -260,7 +263,7 @@ async fn unlock_and_increment_retry_exhausted(pool: PgPool) {
            .fetch_one(&pool)
            .await
            .unwrap();
-    assert_eq!(retry_count, 3);
+    assert_eq!(retry_count, 4);
 }

 #[sqlx::test]
@@ -276,11 +279,11 @@ async fn unlock_and_increment_retry_already_exceeded(pool: PgPool) {
    )
    .await;

-    let has_retries = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
+    let result = scrape_jobs::unlock_and_increment_retry(id, 3, &pool)
        .await
        .unwrap();
    assert!(
-        !has_retries,
+        result.is_none(),
        "should NOT have retries remaining (5→6, max=3)"
    );

@@ -346,7 +349,7 @@ async fn find_existing_payloads_returns_matching(pool: PgPool) {
 }

 #[sqlx::test]
-async fn find_existing_payloads_ignores_locked(pool: PgPool) {
+async fn find_existing_payloads_includes_locked(pool: PgPool) {
    let payload = json!({"subject": "CS"});

    helpers::insert_scrape_job(
@@ -365,7 +368,10 @@ async fn find_existing_payloads_ignores_locked(pool: PgPool) {
        .await
        .unwrap();

-    assert!(existing.is_empty(), "locked jobs should be ignored");
+    assert!(
+        existing.contains(&payload.to_string()),
+        "locked jobs should be included in deduplication"
+    );
 }

 #[sqlx::test]
@@ -7,7 +7,7 @@
  },
  "files": {
    "ignoreUnknown": false,
-    "ignore": ["dist/", "node_modules/", ".svelte-kit/"]
+    "ignore": ["dist/", "node_modules/", ".svelte-kit/", "src/lib/bindings/"]
  },
  "formatter": {
    "enabled": true,
@@ -5,6 +5,11 @@
    "": {
      "name": "banner-web",
      "dependencies": {
+        "@icons-pack/svelte-simple-icons": "^6.5.0",
+        "d3-scale": "^4.0.2",
+        "d3-shape": "^3.2.0",
+        "d3-time-format": "^4.1.0",
+        "date-fns": "^4.1.0",
        "overlayscrollbars": "^2.14.0",
        "overlayscrollbars-svelte": "^0.5.5",
      },
@@ -17,6 +22,9 @@
        "@sveltejs/vite-plugin-svelte": "^5.0.3",
        "@tailwindcss/vite": "^4.0.0",
        "@tanstack/table-core": "^8.21.3",
+        "@types/d3-scale": "^4.0.9",
+        "@types/d3-shape": "^3.1.8",
+        "@types/d3-time-format": "^4.0.3",
        "@types/node": "^25.1.0",
        "bits-ui": "^1.3.7",
        "clsx": "^2.1.1",
@@ -122,6 +130,8 @@

    "@fontsource-variable/inter": ["@fontsource-variable/inter@5.2.8", "", {}, "sha512-kOfP2D+ykbcX/P3IFnokOhVRNoTozo5/JxhAIVYLpea/UBmCQ/YWPBfWIDuBImXX/15KH+eKh4xpEUyS2sQQGQ=="],

+    "@icons-pack/svelte-simple-icons": ["@icons-pack/svelte-simple-icons@6.5.0", "", { "peerDependencies": { "@sveltejs/kit": "^2.5.0", "svelte": "^4.2.0 || ^5.0.0" } }, "sha512-Xj3PTioiV3TJ1NTKsXY95NFG8FUqw90oeyDZIlslWHs1KkuCheu1HOPrlHb0/IM0b4cldPgx/0TldzxzBlM8Cw=="],
+
    "@internationalized/date": ["@internationalized/date@3.10.1", "", { "dependencies": { "@swc/helpers": "^0.5.0" } }, "sha512-oJrXtQiAXLvT9clCf1K4kxp3eKsQhIaZqxEyowkBcsvZDdZkbWrVmnGknxs5flTD0VGsxrxKgBCZty1EzoiMzA=="],

    "@jridgewell/gen-mapping": ["@jridgewell/gen-mapping@0.3.13", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.5.0", "@jridgewell/trace-mapping": "^0.3.24" } }, "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA=="],
@@ -238,6 +248,16 @@

    "@types/cookie": ["@types/cookie@0.6.0", "", {}, "sha512-4Kh9a6B2bQciAhf7FSuMRRkUWecJgJu9nPnx3yzpsfXX/c50REIqpHY4C82bXP90qrLtXtkDxTZosYO3UpOwlA=="],

+    "@types/d3-path": ["@types/d3-path@3.1.1", "", {}, "sha512-VMZBYyQvbGmWyWVea0EHs/BwLgxc+MKi1zLDCONksozI4YJMcTt8ZEuIR4Sb1MMTE8MMW49v0IwI5+b7RmfWlg=="],
+
+    "@types/d3-scale": ["@types/d3-scale@4.0.9", "", { "dependencies": { "@types/d3-time": "*" } }, "sha512-dLmtwB8zkAeO/juAMfnV+sItKjlsw2lKdZVVy6LRr0cBmegxSABiLEpGVmSJJ8O08i4+sGR6qQtb6WtuwJdvVw=="],
+
+    "@types/d3-shape": ["@types/d3-shape@3.1.8", "", { "dependencies": { "@types/d3-path": "*" } }, "sha512-lae0iWfcDeR7qt7rA88BNiqdvPS5pFVPpo5OfjElwNaT2yyekbM0C9vK+yqBqEmHr6lDkRnYNoTBYlAgJa7a4w=="],
+
+    "@types/d3-time": ["@types/d3-time@3.0.4", "", {}, "sha512-yuzZug1nkAAaBlBBikKZTgzCeA+k1uy4ZFwWANOfKw5z5LRhV0gNA7gNkKm7HoK+HRN0wX3EkxGk0fpbWhmB7g=="],
+
+    "@types/d3-time-format": ["@types/d3-time-format@4.0.3", "", {}, "sha512-5xg9rC+wWL8kdDj153qZcsJ0FWiFt0J5RB6LYUNZjwSnesfblqrI/bJ1wBdJ8OQfncgbJG5+2F+qfqnqyzYxyg=="],
+
    "@types/deep-eql": ["@types/deep-eql@4.0.2", "", {}, "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw=="],

    "@types/estree": ["@types/estree@1.0.8", "", {}, "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="],
@@ -286,8 +306,28 @@

    "cssstyle": ["cssstyle@4.6.0", "", { "dependencies": { "@asamuzakjp/css-color": "^3.2.0", "rrweb-cssom": "^0.8.0" } }, "sha512-2z+rWdzbbSZv6/rhtvzvqeZQHrBaqgogqt85sqFNbabZOuFbCVFb8kPeEtZjiKkbrm395irpNKiYeFeLiQnFPg=="],

+    "d3-array": ["d3-array@3.2.4", "", { "dependencies": { "internmap": "1 - 2" } }, "sha512-tdQAmyA18i4J7wprpYq8ClcxZy3SC31QMeByyCFyRt7BVHdREQZ5lpzoe5mFEYZUWe+oq8HBvk9JjpibyEV4Jg=="],
+
+    "d3-color": ["d3-color@3.1.0", "", {}, "sha512-zg/chbXyeBtMQ1LbD/WSoW2DpC3I0mpmPdW+ynRTj/x2DAWYrIY7qeZIHidozwV24m4iavr15lNwIwLxRmOxhA=="],
+
+    "d3-format": ["d3-format@3.1.2", "", {}, "sha512-AJDdYOdnyRDV5b6ArilzCPPwc1ejkHcoyFarqlPqT7zRYjhavcT3uSrqcMvsgh2CgoPbK3RCwyHaVyxYcP2Arg=="],
+
+    "d3-interpolate": ["d3-interpolate@3.0.1", "", { "dependencies": { "d3-color": "1 - 3" } }, "sha512-3bYs1rOD33uo8aqJfKP3JWPAibgw8Zm2+L9vBKEHJ2Rg+viTR7o5Mmv5mZcieN+FRYaAOWX5SJATX6k1PWz72g=="],
+
+    "d3-path": ["d3-path@3.1.0", "", {}, "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ=="],
+
+    "d3-scale": ["d3-scale@4.0.2", "", { "dependencies": { "d3-array": "2.10.0 - 3", "d3-format": "1 - 3", "d3-interpolate": "1.2.0 - 3", "d3-time": "2.1.1 - 3", "d3-time-format": "2 - 4" } }, "sha512-GZW464g1SH7ag3Y7hXjf8RoUuAFIqklOAq3MRl4OaWabTFJY9PN/E1YklhXLh+OQ3fM9yS2nOkCoS+WLZ6kvxQ=="],
+
+    "d3-shape": ["d3-shape@3.2.0", "", { "dependencies": { "d3-path": "^3.1.0" } }, "sha512-SaLBuwGm3MOViRq2ABk3eLoxwZELpH6zhl3FbAoJ7Vm1gofKx6El1Ib5z23NUEhF9AsGl7y+dzLe5Cw2AArGTA=="],
+
+    "d3-time": ["d3-time@3.1.0", "", { "dependencies": { "d3-array": "2 - 3" } }, "sha512-VqKjzBLejbSMT4IgbmVgDjpkYrNWUYJnbCGo874u7MMKIWsILRX+OpX/gTk8MqjpT1A/c6HY2dCA77ZN0lkQ2Q=="],
+
+    "d3-time-format": ["d3-time-format@4.1.0", "", { "dependencies": { "d3-time": "1 - 3" } }, "sha512-dJxPBlzC7NugB2PDLwo9Q8JiTR3M3e4/XANkreKSUxF8vvXKqm1Yfq4Q5dl8budlunRVlUUaDUgFt7eA8D6NLg=="],
+
    "data-urls": ["data-urls@5.0.0", "", { "dependencies": { "whatwg-mimetype": "^4.0.0", "whatwg-url": "^14.0.0" } }, "sha512-ZYP5VBHshaDAiVZxjbRVcFJpc+4xGgT0bK3vzy1HLN8jTO975HEbuYzZJcHoQEY5K1a0z8YayJkyVETa08eNTg=="],

+    "date-fns": ["date-fns@4.1.0", "", {}, "sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg=="],
+
    "debug": ["debug@4.4.3", "", { "dependencies": { "ms": "^2.1.3" } }, "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA=="],

    "decimal.js": ["decimal.js@10.6.0", "", {}, "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg=="],
@@ -332,6 +372,8 @@

    "inline-style-parser": ["inline-style-parser@0.2.7", "", {}, "sha512-Nb2ctOyNR8DqQoR0OwRG95uNWIC0C1lCgf5Naz5H6Ji72KZ8OcFZLz2P5sNgwlyoJ8Yif11oMuYs5pBQa86csA=="],

+    "internmap": ["internmap@2.0.3", "", {}, "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg=="],
+
    "is-potential-custom-element-name": ["is-potential-custom-element-name@1.0.1", "", {}, "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ=="],

    "is-reference": ["is-reference@3.0.3", "", { "dependencies": { "@types/estree": "^1.0.6" } }, "sha512-ixkJoqQvAP88E6wLydLGGqCJsrFUnqoH6HnaczB8XmDH1oaWU+xxdptvikTgaEhtZ53Ky6YXiBuUI2WXLMCwjw=="],
@@ -20,6 +20,9 @@
    "@sveltejs/vite-plugin-svelte": "^5.0.3",
    "@tailwindcss/vite": "^4.0.0",
    "@tanstack/table-core": "^8.21.3",
+    "@types/d3-scale": "^4.0.9",
+    "@types/d3-shape": "^3.1.8",
+    "@types/d3-time-format": "^4.0.3",
    "@types/node": "^25.1.0",
    "bits-ui": "^1.3.7",
    "clsx": "^2.1.1",
@@ -33,6 +36,11 @@
    "vitest": "^3.0.5"
  },
  "dependencies": {
+    "@icons-pack/svelte-simple-icons": "^6.5.0",
+    "d3-scale": "^4.0.2",
+    "d3-shape": "^3.2.0",
+    "d3-time-format": "^4.1.0",
+    "date-fns": "^4.1.0",
    "overlayscrollbars": "^2.14.0",
    "overlayscrollbars-svelte": "^0.5.5"
  }
@@ -0,0 +1,148 @@
+#!/usr/bin/env bun
+/**
+ * Pre-compress static assets with maximum compression levels.
+ * Run after `bun run build`.
+ *
+ * Generates .gz, .br, .zst variants for compressible files ≥ MIN_SIZE bytes.
+ * These are embedded alongside originals by rust-embed and served via
+ * content negotiation in src/web/assets.rs.
+ */
+import { readdir, stat, readFile, writeFile } from "fs/promises";
+import { join, extname } from "path";
+import { gzipSync, brotliCompressSync, constants } from "zlib";
+import { $ } from "bun";
+
+// Must match COMPRESSION_MIN_SIZE in src/web/encoding.rs
+const MIN_SIZE = 512;
+
+const COMPRESSIBLE_EXTENSIONS = new Set([
+  ".js",
+  ".css",
+  ".html",
+  ".json",
+  ".svg",
+  ".txt",
+  ".xml",
+  ".map",
+]);
+
+// Check if zstd CLI is available
+let hasZstd = false;
+try {
+  await $`which zstd`.quiet();
+  hasZstd = true;
+} catch {
+  console.warn("Warning: zstd not found, skipping .zst generation");
+}
+
+async function* walkDir(dir: string): AsyncGenerator<string> {
+  try {
+    const entries = await readdir(dir, { withFileTypes: true });
+    for (const entry of entries) {
+      const path = join(dir, entry.name);
+      if (entry.isDirectory()) {
+        yield* walkDir(path);
+      } else if (entry.isFile()) {
+        yield path;
+      }
+    }
+  } catch {
+    // Directory doesn't exist, skip
+  }
+}
+
+async function compressFile(path: string): Promise<void> {
+  const ext = extname(path);
+
+  if (!COMPRESSIBLE_EXTENSIONS.has(ext)) return;
+  if (path.endsWith(".br") || path.endsWith(".gz") || path.endsWith(".zst")) return;
+
+  const stats = await stat(path);
+  if (stats.size < MIN_SIZE) return;
+
+  // Skip if all compressed variants already exist
+  const variantsExist = await Promise.all([
+    stat(`${path}.br`).then(
+      () => true,
+      () => false
+    ),
+    stat(`${path}.gz`).then(
+      () => true,
+      () => false
+    ),
+    hasZstd
+      ? stat(`${path}.zst`).then(
+          () => true,
+          () => false
+        )
+      : Promise.resolve(false),
+  ]);
+
+  if (variantsExist.every((exists) => exists || !hasZstd)) {
+    return;
+  }
+
+  const content = await readFile(path);
+  const originalSize = content.length;
+
+  // Brotli (maximum quality = 11)
+  const brContent = brotliCompressSync(content, {
+    params: {
+      [constants.BROTLI_PARAM_QUALITY]: 11,
+    },
+  });
+  await writeFile(`${path}.br`, brContent);
+
+  // Gzip (level 9)
+  const gzContent = gzipSync(content, { level: 9 });
+  await writeFile(`${path}.gz`, gzContent);
+
+  // Zstd (level 19 - maximum)
+  if (hasZstd) {
+    try {
+      await $`zstd -19 -q -f -o ${path}.zst ${path}`.quiet();
+    } catch (e) {
+      console.warn(`Warning: Failed to compress ${path} with zstd: ${e}`);
+    }
+  }
+
+  const brRatio = ((brContent.length / originalSize) * 100).toFixed(1);
+  const gzRatio = ((gzContent.length / originalSize) * 100).toFixed(1);
+  console.log(`Compressed: ${path} (br: ${brRatio}%, gz: ${gzRatio}%, ${originalSize} bytes)`);
+}
+
+async function main() {
+  console.log("Pre-compressing static assets...");
+
+  // Banner uses adapter-static with output in dist/
+  const dirs = ["dist"];
+  let scannedFiles = 0;
+  let compressedFiles = 0;
+
+  for (const dir of dirs) {
+    for await (const file of walkDir(dir)) {
+      const ext = extname(file);
+      scannedFiles++;
+
+      if (
+        COMPRESSIBLE_EXTENSIONS.has(ext) &&
+        !file.endsWith(".br") &&
+        !file.endsWith(".gz") &&
+        !file.endsWith(".zst")
+      ) {
+        const stats = await stat(file);
+        if (stats.size >= MIN_SIZE) {
+          await compressFile(file);
+          compressedFiles++;
+        }
+      }
+    }
+  }
+
+  console.log(`Done! Scanned ${scannedFiles} files, compressed ${compressedFiles} files.`);
+}
+
+main().catch((e) => {
+  console.error("Compression failed:", e);
+  process.exit(1);
+});
@@ -11,23 +11,6 @@ describe("BannerApiClient", () => {
    vi.clearAllMocks();
  });

-  it("should fetch health data", async () => {
-    const mockHealth = {
-      status: "healthy",
-      timestamp: "2024-01-01T00:00:00Z",
-    };
-
-    vi.mocked(fetch).mockResolvedValueOnce({
-      ok: true,
-      json: () => Promise.resolve(mockHealth),
-    } as Response);
-
-    const result = await apiClient.getHealth();
-
-    expect(fetch).toHaveBeenCalledWith("/api/health");
-    expect(result).toEqual(mockHealth);
-  });
-
  it("should fetch status data", async () => {
    const mockStatus = {
      status: "active" as const,
@@ -57,7 +40,7 @@ describe("BannerApiClient", () => {
      statusText: "Internal Server Error",
    } as Response);

-    await expect(apiClient.getHealth()).rejects.toThrow(
+    await expect(apiClient.getStatus()).rejects.toThrow(
      "API request failed: 500 Internal Server Error"
    );
  });
@@ -77,7 +60,7 @@ describe("BannerApiClient", () => {

    const result = await apiClient.searchCourses({
      term: "202420",
-      subject: "CS",
+      subjects: ["CS"],
      q: "data",
      open_only: true,
      limit: 25,
@@ -1,25 +1,44 @@
 import type {
+  CandidateResponse,
  CodeDescription,
  CourseResponse,
  DbMeetingTime,
+  InstructorDetail,
+  InstructorDetailResponse,
+  InstructorListItem,
  InstructorResponse,
+  InstructorStats,
+  LinkedRmpProfile,
+  ListInstructorsResponse,
+  RescoreResponse,
  SearchResponse as SearchResponseGenerated,
  ServiceInfo,
  ServiceStatus,
  StatusResponse,
+  TopCandidateResponse,
+  User,
 } from "$lib/bindings";

 const API_BASE_URL = "/api";

 // Re-export generated types under their canonical names
 export type {
+  CandidateResponse,
  CodeDescription,
  CourseResponse,
  DbMeetingTime,
+  InstructorDetail,
+  InstructorDetailResponse,
+  InstructorListItem,
  InstructorResponse,
+  InstructorStats,
+  LinkedRmpProfile,
+  ListInstructorsResponse,
+  RescoreResponse,
  ServiceInfo,
  ServiceStatus,
  StatusResponse,
+  TopCandidateResponse,
 };

 // Semantic aliases — these all share the CodeDescription shape
@@ -30,26 +49,79 @@ export type ReferenceEntry = CodeDescription;
 // SearchResponse re-exported (aliased to strip the "Generated" suffix)
 export type SearchResponse = SearchResponseGenerated;

-// Health/metrics endpoints return ad-hoc JSON — keep manual types
-export interface HealthResponse {
-  status: string;
-  timestamp: string;
-}
-
-export interface MetricsResponse {
-  banner_api: {
-    status: string;
-  };
-  timestamp: string;
-}
-
 // Client-side only — not generated from Rust
 export type SortColumn = "course_code" | "title" | "instructor" | "time" | "seats";
 export type SortDirection = "asc" | "desc";

+export interface AdminStatus {
+  userCount: number;
+  sessionCount: number;
+  courseCount: number;
+  scrapeJobCount: number;
+  services: { name: string; status: string }[];
+}
+
+export interface ScrapeJob {
+  id: number;
+  targetType: string;
+  targetPayload: unknown;
+  priority: string;
+  executeAt: string;
+  createdAt: string;
+  lockedAt: string | null;
+  retryCount: number;
+  maxRetries: number;
+  queuedAt: string;
+  status: "processing" | "staleLock" | "exhausted" | "scheduled" | "pending";
+}
+
+export interface ScrapeJobsResponse {
+  jobs: ScrapeJob[];
+}
+
+export interface AuditLogEntry {
+  id: number;
+  courseId: number;
+  timestamp: string;
+  fieldChanged: string;
+  oldValue: string;
+  newValue: string;
+  subject: string | null;
+  courseNumber: string | null;
+  crn: string | null;
+  courseTitle: string | null;
+}
+
+export interface AuditLogResponse {
+  entries: AuditLogEntry[];
+}
+
+export interface MetricEntry {
+  id: number;
+  courseId: number;
+  timestamp: string;
+  enrollment: number;
+  waitCount: number;
+  seatsAvailable: number;
+}
+
+export interface MetricsResponse {
+  metrics: MetricEntry[];
+  count: number;
+  timestamp: string;
+}
+
+export interface MetricsParams {
+  course_id?: number;
+  term?: string;
+  crn?: string;
+  range?: "1h" | "6h" | "24h" | "7d" | "30d";
+  limit?: number;
+}
+
 export interface SearchParams {
  term: string;
-  subject?: string;
+  subjects?: string[];
  q?: string;
  open_only?: boolean;
  limit?: number;
@@ -58,6 +130,15 @@ export interface SearchParams {
  sort_dir?: SortDirection;
 }

+// Admin instructor query params (client-only, not generated)
+export interface AdminInstructorListParams {
+  status?: string;
+  search?: string;
+  page?: number;
+  per_page?: number;
+  sort?: string;
+}
+
 export class BannerApiClient {
  private baseUrl: string;
  private fetchFn: typeof fetch;
@@ -67,8 +148,30 @@ export class BannerApiClient {
    this.fetchFn = fetchFn;
  }

-  private async request<T>(endpoint: string): Promise<T> {
-    const response = await this.fetchFn(`${this.baseUrl}${endpoint}`);
+  private buildInit(options?: { method?: string; body?: unknown }): RequestInit | undefined {
+    if (!options) return undefined;
+    const init: RequestInit = {};
+    if (options.method) {
+      init.method = options.method;
+    }
+    if (options.body !== undefined) {
+      init.headers = { "Content-Type": "application/json" };
+      init.body = JSON.stringify(options.body);
+    } else if (options.method) {
+      init.headers = { "Content-Type": "application/json" };
+    }
+    return Object.keys(init).length > 0 ? init : undefined;
+  }
+
+  private async request<T>(
+    endpoint: string,
+    options?: { method?: string; body?: unknown }
+  ): Promise<T> {
+    const init = this.buildInit(options);
+    const args: [string, RequestInit?] = [`${this.baseUrl}${endpoint}`];
+    if (init) args.push(init);
+
+    const response = await this.fetchFn(...args);

    if (!response.ok) {
      throw new Error(`API request failed: ${response.status} ${response.statusText}`);
@@ -77,22 +180,33 @@ export class BannerApiClient {
    return (await response.json()) as T;
  }

-  async getHealth(): Promise<HealthResponse> {
-    return this.request<HealthResponse>("/health");
+  private async requestVoid(
+    endpoint: string,
+    options?: { method?: string; body?: unknown }
+  ): Promise<void> {
+    const init = this.buildInit(options);
+    const args: [string, RequestInit?] = [`${this.baseUrl}${endpoint}`];
+    if (init) args.push(init);
+
+    const response = await this.fetchFn(...args);
+
+    if (!response.ok) {
+      throw new Error(`API request failed: ${response.status} ${response.statusText}`);
+    }
  }

  async getStatus(): Promise<StatusResponse> {
    return this.request<StatusResponse>("/status");
  }

-  async getMetrics(): Promise<MetricsResponse> {
-    return this.request<MetricsResponse>("/metrics");
-  }
-
  async searchCourses(params: SearchParams): Promise<SearchResponse> {
    const query = new URLSearchParams();
    query.set("term", params.term);
-    if (params.subject) query.set("subject", params.subject);
+    if (params.subjects) {
+      for (const s of params.subjects) {
+        query.append("subject", s);
+      }
+    }
    if (params.q) query.set("q", params.q);
    if (params.open_only) query.set("open_only", "true");
    if (params.limit !== undefined) query.set("limit", String(params.limit));
@@ -113,6 +227,120 @@ export class BannerApiClient {
  async getReference(category: string): Promise<ReferenceEntry[]> {
    return this.request<ReferenceEntry[]>(`/reference/${encodeURIComponent(category)}`);
  }
+
+  // Admin endpoints
+  async getAdminStatus(): Promise<AdminStatus> {
+    return this.request<AdminStatus>("/admin/status");
+  }
+
+  async getAdminUsers(): Promise<User[]> {
+    return this.request<User[]>("/admin/users");
+  }
+
+  async setUserAdmin(discordId: string, isAdmin: boolean): Promise<User> {
+    return this.request<User>(`/admin/users/${discordId}/admin`, {
+      method: "PUT",
+      body: { is_admin: isAdmin },
+    });
+  }
+
+  async getAdminScrapeJobs(): Promise<ScrapeJobsResponse> {
+    return this.request<ScrapeJobsResponse>("/admin/scrape-jobs");
+  }
+
+  /**
+   * Fetch the audit log with conditional request support.
+   *
+   * Returns `null` when the server responds 304 (data unchanged).
+   * Stores and sends `Last-Modified` / `If-Modified-Since` automatically.
+   */
+  async getAdminAuditLog(): Promise<AuditLogResponse | null> {
+    const headers: Record<string, string> = {};
+    if (this._auditLastModified) {
+      headers["If-Modified-Since"] = this._auditLastModified;
+    }
+
+    const response = await this.fetchFn(`${this.baseUrl}/admin/audit-log`, { headers });
+
+    if (response.status === 304) {
+      return null;
+    }
+
+    if (!response.ok) {
+      throw new Error(`API request failed: ${response.status} ${response.statusText}`);
+    }
+
+    const lastMod = response.headers.get("Last-Modified");
+    if (lastMod) {
+      this._auditLastModified = lastMod;
+    }
+
+    return (await response.json()) as AuditLogResponse;
+  }
+
+  /** Stored `Last-Modified` value for audit log conditional requests. */
+  private _auditLastModified: string | null = null;
+
+  async getMetrics(params?: MetricsParams): Promise<MetricsResponse> {
+    const query = new URLSearchParams();
+    if (params?.course_id !== undefined) query.set("course_id", String(params.course_id));
+    if (params?.term) query.set("term", params.term);
+    if (params?.crn) query.set("crn", params.crn);
+    if (params?.range) query.set("range", params.range);
+    if (params?.limit !== undefined) query.set("limit", String(params.limit));
+    const qs = query.toString();
+    return this.request<MetricsResponse>(`/metrics${qs ? `?${qs}` : ""}`);
+  }
+
+  // Admin instructor endpoints
+
+  async getAdminInstructors(params?: AdminInstructorListParams): Promise<ListInstructorsResponse> {
+    const query = new URLSearchParams();
+    if (params?.status) query.set("status", params.status);
+    if (params?.search) query.set("search", params.search);
+    if (params?.page !== undefined) query.set("page", String(params.page));
+    if (params?.per_page !== undefined) query.set("per_page", String(params.per_page));
+    if (params?.sort) query.set("sort", params.sort);
+    const qs = query.toString();
+    return this.request<ListInstructorsResponse>(`/admin/instructors${qs ? `?${qs}` : ""}`);
+  }
+
+  async getAdminInstructor(id: number): Promise<InstructorDetailResponse> {
+    return this.request<InstructorDetailResponse>(`/admin/instructors/${id}`);
+  }
+
+  async matchInstructor(id: number, rmpLegacyId: number): Promise<InstructorDetailResponse> {
+    return this.request<InstructorDetailResponse>(`/admin/instructors/${id}/match`, {
+      method: "POST",
+      body: { rmpLegacyId },
+    });
+  }
+
+  async rejectCandidate(id: number, rmpLegacyId: number): Promise<void> {
+    return this.requestVoid(`/admin/instructors/${id}/reject-candidate`, {
+      method: "POST",
+      body: { rmpLegacyId },
+    });
+  }
+
+  async rejectAllCandidates(id: number): Promise<void> {
+    return this.requestVoid(`/admin/instructors/${id}/reject-all`, {
+      method: "POST",
+    });
+  }
+
+  async unmatchInstructor(id: number, rmpLegacyId?: number): Promise<void> {
+    return this.requestVoid(`/admin/instructors/${id}/unmatch`, {
+      method: "POST",
+      ...(rmpLegacyId !== undefined ? { body: { rmpLegacyId } } : {}),
+    });
+  }
+
+  async rescoreInstructors(): Promise<RescoreResponse> {
+    return this.request<RescoreResponse>("/admin/rmp/rescore", {
+      method: "POST",
+    });
+  }
 }

 export const client = new BannerApiClient();
@@ -0,0 +1,77 @@
+import type { User } from "$lib/bindings";
+
+type AuthState =
+  | { mode: "loading" }
+  | { mode: "authenticated"; user: User }
+  | { mode: "unauthenticated" };
+
+class AuthStore {
+  state = $state<AuthState>({ mode: "loading" });
+
+  get user(): User | null {
+    return this.state.mode === "authenticated" ? this.state.user : null;
+  }
+
+  get isAdmin(): boolean {
+    return this.user?.isAdmin ?? false;
+  }
+
+  get isLoading(): boolean {
+    return this.state.mode === "loading";
+  }
+
+  get isAuthenticated(): boolean {
+    return this.state.mode === "authenticated";
+  }
+
+  /**
+   * Attempt to load the current user session from the backend.
+   * Only transitions to "unauthenticated" on a definitive 401/403.
+   * Retries indefinitely on transient failures (network errors, 5xx)
+   * so that a slow backend startup doesn't kick the user to login.
+   */
+  async init() {
+    const MAX_DELAY_MS = 7_000;
+    let delayMs = 500;
+
+    for (;;) {
+      try {
+        const response = await fetch("/api/auth/me");
+
+        if (response.ok) {
+          const user: User = await response.json();
+          this.state = { mode: "authenticated", user };
+          return;
+        }
+
+        // Definitive rejection — no session or not authorized
+        if (response.status === 401 || response.status === 403) {
+          this.state = { mode: "unauthenticated" };
+          return;
+        }
+
+        // Server error (5xx) or unexpected status — retry
+      } catch {
+        // Network error (backend not up yet) — retry
+      }
+
+      await new Promise((r) => setTimeout(r, delayMs));
+      delayMs = Math.min(delayMs * 2, MAX_DELAY_MS);
+    }
+  }
+
+  login() {
+    window.location.href = "/api/auth/login";
+  }
+
+  async logout() {
+    try {
+      await fetch("/api/auth/logout", { method: "POST" });
+    } finally {
+      this.state = { mode: "unauthenticated" };
+      window.location.href = "/";
+    }
+  }
+}
+
+export const authStore = new AuthStore();
@@ -0,0 +1,19 @@
+export type { CandidateResponse } from "./CandidateResponse";
+export type { CodeDescription } from "./CodeDescription";
+export type { CourseResponse } from "./CourseResponse";
+export type { DbMeetingTime } from "./DbMeetingTime";
+export type { InstructorDetail } from "./InstructorDetail";
+export type { InstructorDetailResponse } from "./InstructorDetailResponse";
+export type { InstructorListItem } from "./InstructorListItem";
+export type { InstructorResponse } from "./InstructorResponse";
+export type { InstructorStats } from "./InstructorStats";
+export type { LinkedRmpProfile } from "./LinkedRmpProfile";
+export type { ListInstructorsResponse } from "./ListInstructorsResponse";
+export type { OkResponse } from "./OkResponse";
+export type { RescoreResponse } from "./RescoreResponse";
+export type { SearchResponse } from "./SearchResponse";
+export type { ServiceInfo } from "./ServiceInfo";
+export type { ServiceStatus } from "./ServiceStatus";
+export type { StatusResponse } from "./StatusResponse";
+export type { TopCandidateResponse } from "./TopCandidateResponse";
+export type { User } from "./User";
@@ -7,251 +7,300 @@ import {
  formatMeetingDaysLong,
  isMeetingTimeTBA,
  isTimeTBA,
+  ratingStyle,
+  rmpUrl,
+  RMP_CONFIDENCE_THRESHOLD,
 } from "$lib/course";
+import { themeStore } from "$lib/stores/theme.svelte";
+import { useClipboard } from "$lib/composables/useClipboard.svelte";
+import { cn, tooltipContentClass, formatNumber } from "$lib/utils";
 import { Tooltip } from "bits-ui";
-import { Info, Copy, Check } from "@lucide/svelte";
+import SimpleTooltip from "./SimpleTooltip.svelte";
+import { Info, Copy, Check, Star, Triangle, ExternalLink } from "@lucide/svelte";

 let { course }: { course: CourseResponse } = $props();

-let copiedEmail: string | null = $state(null);
-
-async function copyEmail(email: string, event: MouseEvent) {
-  event.stopPropagation();
-  await navigator.clipboard.writeText(email);
-  copiedEmail = email;
-  setTimeout(() => {
-    copiedEmail = null;
-  }, 2000);
-}
+const clipboard = useClipboard();
 </script>

 <div class="bg-muted/60 p-5 text-sm border-b border-border">
-  <div class="grid grid-cols-1 sm:grid-cols-2 gap-5">
-    <!-- Instructors -->
-    <div>
-      <h4 class="text-sm text-foreground mb-2">
-        Instructors
-      </h4>
-      {#if course.instructors.length > 0}
-        <div class="flex flex-wrap gap-1.5">
-          {#each course.instructors as instructor}
-            <Tooltip.Root delayDuration={200}>
-              <Tooltip.Trigger>
-                <span
-                  class="inline-flex items-center gap-1.5 text-sm font-medium bg-card border border-border rounded-md px-2.5 py-1 text-foreground hover:border-foreground/20 hover:bg-card/80 transition-colors"
-                >
-                  {instructor.displayName}
-                  {#if 'rmpRating' in instructor && instructor.rmpRating}
-                    {@const rating = instructor.rmpRating as number}
-                    <span
-                      class="text-[10px] font-semibold {rating >= 4.0 ? 'text-status-green' : rating >= 3.0 ? 'text-yellow-500' : 'text-status-red'}"
-                    >{rating.toFixed(1)}★</span>
-                  {/if}
-                </span>
-              </Tooltip.Trigger>
-              <Tooltip.Content
-                class="bg-card text-card-foreground text-xs border border-border rounded-md px-3 py-2 shadow-md max-w-72"
-              >
-                <div class="space-y-1.5">
-                  <div class="font-medium">{instructor.displayName}</div>
-                  {#if instructor.isPrimary}
-                    <div class="text-muted-foreground">Primary instructor</div>
-                  {/if}
-                  {#if 'rmpRating' in instructor && instructor.rmpRating}
-                    <div class="text-muted-foreground">
-                      {(instructor.rmpRating as number).toFixed(1)}/5 ({(instructor as any).rmpNumRatings ?? 0} ratings)
-                    </div>
-                  {/if}
-                  {#if instructor.email}
-                    <button
-                      onclick={(e) => copyEmail(instructor.email!, e)}
-                      class="inline-flex items-center gap-1 text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
-                    >
-                      {#if copiedEmail === instructor.email}
-                        <Check class="size-3" />
-                        <span>Copied!</span>
-                      {:else}
-                        <Copy class="size-3" />
-                        <span>{instructor.email}</span>
-                      {/if}
-                    </button>
-                  {/if}
+    <div class="grid grid-cols-1 sm:grid-cols-2 gap-5">
+        <!-- Instructors -->
+        <div>
+            <h4 class="text-sm text-foreground mb-2">Instructors</h4>
+            {#if course.instructors.length > 0}
+                <div class="flex flex-wrap gap-1.5">
+                    {#each course.instructors as instructor}
+                        <Tooltip.Root delayDuration={200}>
+                            <Tooltip.Trigger>
+                                <span
+                                    class="inline-flex items-center gap-1.5 text-sm font-medium bg-card border border-border rounded-md px-2.5 py-1 text-foreground hover:border-foreground/20 hover:bg-card/80 transition-colors"
+                                >
+                                    {instructor.displayName}
+                                    {#if instructor.rmpRating != null}
+                                        {@const rating = instructor.rmpRating}
+                                        {@const lowConfidence =
+                                            (instructor.rmpNumRatings ?? 0) <
+                                            RMP_CONFIDENCE_THRESHOLD}
+                                        <span
+                                            class="text-[10px] font-semibold inline-flex items-center gap-0.5"
+                                            style={ratingStyle(
+                                                rating,
+                                                themeStore.isDark,
+                                            )}
+                                        >
+                                            {rating.toFixed(1)}
+                                            {#if lowConfidence}
+                                                <Triangle
+                                                    class="size-2 fill-current"
+                                                />
+                                            {:else}
+                                                <Star
+                                                    class="size-2.5 fill-current"
+                                                />
+                                            {/if}
+                                        </span>
+                                    {/if}
+                                </span>
+                            </Tooltip.Trigger>
+                            <Tooltip.Content
+                                sideOffset={6}
+                                class={cn(tooltipContentClass, "px-3 py-2")}
+                            >
+                                <div class="space-y-1.5">
+                                    <div class="font-medium">
+                                        {instructor.displayName}
+                                    </div>
+                                    {#if instructor.isPrimary}
+                                        <div class="text-muted-foreground">
+                                            Primary instructor
+                                        </div>
+                                    {/if}
+                                    {#if instructor.rmpRating != null}
+                                        <div class="text-muted-foreground">
+                                            {instructor.rmpRating.toFixed(1)}/5
+                                            · {instructor.rmpNumRatings ?? 0} ratings
+                                            {#if (instructor.rmpNumRatings ?? 0) < RMP_CONFIDENCE_THRESHOLD}
+                                                (low)
+                                            {/if}
+                                        </div>
+                                    {/if}
+                                    {#if instructor.rmpLegacyId != null}
+                                        <a
+                                            href={rmpUrl(
+                                                instructor.rmpLegacyId,
+                                            )}
+                                            target="_blank"
+                                            rel="noopener"
+                                            class="inline-flex items-center gap-1 text-muted-foreground hover:text-foreground transition-colors"
+                                        >
+                                            <ExternalLink class="size-3" />
+                                            <span>View on RMP</span>
+                                        </a>
+                                    {/if}
+                                    {#if instructor.email}
+                                        <button
+                                            onclick={(e) =>
+                                                clipboard.copy(
+                                                    instructor.email!,
+                                                    e,
+                                                )}
+                                            class="inline-flex items-center gap-1 text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
+                                        >
+                                            {#if clipboard.copiedValue === instructor.email}
+                                                <Check class="size-3" />
+                                                <span>Copied!</span>
+                                            {:else}
+                                                <Copy class="size-3" />
+                                                <span>{instructor.email}</span>
+                                            {/if}
+                                        </button>
+                                    {/if}
+                                </div>
+                            </Tooltip.Content>
+                        </Tooltip.Root>
+                    {/each}
                </div>
-              </Tooltip.Content>
-            </Tooltip.Root>
-          {/each}
-        </div>
-      {:else}
-        <span class="text-muted-foreground italic">Staff</span>
-      {/if}
-    </div>
-
-    <!-- Meeting Times -->
-    <div>
-      <h4 class="text-sm text-foreground mb-2">
-        Meeting Times
-      </h4>
-      {#if course.meetingTimes.length > 0}
-        <ul class="space-y-2">
-          {#each course.meetingTimes as mt}
-            <li>
-              {#if isMeetingTimeTBA(mt) && isTimeTBA(mt)}
-                <span class="italic text-muted-foreground">TBA</span>
-              {:else}
-                <div class="flex items-baseline gap-1.5">
-                  {#if !isMeetingTimeTBA(mt)}
-                    <span class="font-medium text-foreground">
-                      {formatMeetingDaysLong(mt)}
-                    </span>
-                  {/if}
-                  {#if !isTimeTBA(mt)}
-                    <span class="text-muted-foreground">
-                      {formatTime(mt.begin_time)}&ndash;{formatTime(mt.end_time)}
-                    </span>
-                  {:else}
-                    <span class="italic text-muted-foreground">Time TBA</span>
-                  {/if}
-                </div>
-              {/if}
-              {#if mt.building || mt.room}
-                <div class="text-xs text-muted-foreground mt-0.5">
-                  {mt.building_description ?? mt.building}{mt.room ? ` ${mt.room}` : ""}
-                </div>
-              {/if}
-              <div class="text-xs text-muted-foreground/70 mt-0.5">
-                {formatDate(mt.start_date)} &ndash; {formatDate(mt.end_date)}
-              </div>
-            </li>
-          {/each}
-        </ul>
-      {:else}
-        <span class="italic text-muted-foreground">TBA</span>
-      {/if}
-    </div>
-
-    <!-- Delivery -->
-    <div>
-      <h4 class="text-sm text-foreground mb-2">
-        <span class="inline-flex items-center gap-1">
-          Delivery
-          <Tooltip.Root delayDuration={100}>
-            <Tooltip.Trigger>
-              <Info class="size-3 text-muted-foreground/50" />
-            </Tooltip.Trigger>
-            <Tooltip.Content
-              class="bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-72"
-            >
-              How the course is taught: in-person, online, hybrid, etc.
-            </Tooltip.Content>
-          </Tooltip.Root>
-        </span>
-      </h4>
-      <span class="text-foreground">
-        {course.instructionalMethod ?? "—"}
-        {#if course.campus}
-          <span class="text-muted-foreground"> · {course.campus}</span>
-        {/if}
-      </span>
-    </div>
-
-    <!-- Credits -->
-    <div>
-      <h4 class="text-sm text-foreground mb-2">
-        Credits
-      </h4>
-      <span class="text-foreground">{formatCreditHours(course)}</span>
-    </div>
-
-    <!-- Attributes -->
-    {#if course.attributes.length > 0}
-      <div>
-        <h4 class="text-sm text-foreground mb-2">
-          <span class="inline-flex items-center gap-1">
-            Attributes
-            <Tooltip.Root delayDuration={100}>
-              <Tooltip.Trigger>
-                <Info class="size-3 text-muted-foreground/50" />
-              </Tooltip.Trigger>
-              <Tooltip.Content
-                class="bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-72"
-              >
-                Course flags for degree requirements, core curriculum, or special designations
-              </Tooltip.Content>
-            </Tooltip.Root>
-          </span>
-        </h4>
-        <div class="flex flex-wrap gap-1.5">
-          {#each course.attributes as attr}
-            <Tooltip.Root delayDuration={100}>
-              <Tooltip.Trigger>
-                <span
-                  class="inline-flex text-xs font-medium bg-card border border-border rounded-md px-2 py-0.5 text-muted-foreground hover:text-foreground hover:border-foreground/20 transition-colors"
-                >
-                  {attr}
-                </span>
-              </Tooltip.Trigger>
-              <Tooltip.Content
-                class="bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-64"
-              >
-                Course attribute code
-              </Tooltip.Content>
-            </Tooltip.Root>
-          {/each}
-        </div>
-      </div>
-    {/if}
-
-    <!-- Cross-list -->
-    {#if course.crossList}
-      <div>
-        <h4 class="text-sm text-foreground mb-2">
-          <span class="inline-flex items-center gap-1">
-            Cross-list
-            <Tooltip.Root delayDuration={100}>
-              <Tooltip.Trigger>
-                <Info class="size-3 text-muted-foreground/50" />
-              </Tooltip.Trigger>
-              <Tooltip.Content
-                class="bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-72"
-              >
-                Cross-listed sections share enrollment across multiple course numbers. Students in any linked section attend the same class.
-              </Tooltip.Content>
-            </Tooltip.Root>
-          </span>
-        </h4>
-        <Tooltip.Root delayDuration={100}>
-          <Tooltip.Trigger>
-            <span class="inline-flex items-center gap-1.5 text-foreground font-mono">
-              <span class="bg-card border border-border rounded-md px-2 py-0.5 text-xs font-medium">
-                {course.crossList}
-              </span>
-              {#if course.crossListCount != null && course.crossListCapacity != null}
-                <span class="text-muted-foreground text-xs">
-                  {course.crossListCount}/{course.crossListCapacity}
-                </span>
-              {/if}
-            </span>
-          </Tooltip.Trigger>
-          <Tooltip.Content
-            class="bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-72"
-          >
-            Group <span class="font-mono font-medium">{course.crossList}</span>
-            {#if course.crossListCount != null && course.crossListCapacity != null}
-              — {course.crossListCount} enrolled across {course.crossListCapacity} shared seats
+            {:else}
+                <span class="text-muted-foreground italic">Staff</span>
            {/if}
-          </Tooltip.Content>
-        </Tooltip.Root>
-      </div>
-    {/if}
+        </div>

-    <!-- Waitlist -->
-    {#if course.waitCapacity > 0}
-      <div>
-        <h4 class="text-sm text-foreground mb-2">
-          Waitlist
-        </h4>
-        <span class="text-foreground">{course.waitCount} / {course.waitCapacity}</span>
-      </div>
-    {/if}
-  </div>
+        <!-- Meeting Times -->
+        <div>
+            <h4 class="text-sm text-foreground mb-2">Meeting Times</h4>
+            {#if course.meetingTimes.length > 0}
+                <ul class="space-y-2">
+                    {#each course.meetingTimes as mt}
+                        <li>
+                            {#if isMeetingTimeTBA(mt) && isTimeTBA(mt)}
+                                <span class="italic text-muted-foreground"
+                                    >TBA</span
+                                >
+                            {:else}
+                                <div class="flex items-baseline gap-1.5">
+                                    {#if !isMeetingTimeTBA(mt)}
+                                        <span
+                                            class="font-medium text-foreground"
+                                        >
+                                            {formatMeetingDaysLong(mt)}
+                                        </span>
+                                    {/if}
+                                    {#if !isTimeTBA(mt)}
+                                        <span class="text-muted-foreground">
+                                            {formatTime(
+                                                mt.begin_time,
+                                            )}&ndash;{formatTime(mt.end_time)}
+                                        </span>
+                                    {:else}
+                                        <span
+                                            class="italic text-muted-foreground"
+                                            >Time TBA</span
+                                        >
+                                    {/if}
+                                </div>
+                            {/if}
+                            {#if mt.building || mt.room}
+                                <div
+                                    class="text-xs text-muted-foreground mt-0.5"
+                                >
+                                    {mt.building_description ??
+                                        mt.building}{mt.room
+                                        ? ` ${mt.room}`
+                                        : ""}
+                                </div>
+                            {/if}
+                            <div
+                                class="text-xs text-muted-foreground/70 mt-0.5"
+                            >
+                                {formatDate(mt.start_date)} &ndash; {formatDate(
+                                    mt.end_date,
+                                )}
+                            </div>
+                        </li>
+                    {/each}
+                </ul>
+            {:else}
+                <span class="italic text-muted-foreground">TBA</span>
+            {/if}
+        </div>
+
+        <!-- Delivery -->
+        <div>
+            <h4 class="text-sm text-foreground mb-2">
+                <span class="inline-flex items-center gap-1">
+                    Delivery
+                    <SimpleTooltip
+                        text="How the course is taught: in-person, online, hybrid, etc."
+                        delay={150}
+                        passthrough
+                    >
+                        <Info class="size-3 text-muted-foreground/50" />
+                    </SimpleTooltip>
+                </span>
+            </h4>
+            <span class="text-foreground">
+                {course.instructionalMethod ?? "—"}
+                {#if course.campus}
+                    <span class="text-muted-foreground">
+                        · {course.campus}
+                    </span>
+                {/if}
+            </span>
+        </div>
+
+        <!-- Credits -->
+        <div>
+            <h4 class="text-sm text-foreground mb-2">Credits</h4>
+            <span class="text-foreground">{formatCreditHours(course)}</span>
+        </div>
+
+        <!-- Attributes -->
+        {#if course.attributes.length > 0}
+            <div>
+                <h4 class="text-sm text-foreground mb-2">
+                    <span class="inline-flex items-center gap-1">
+                        Attributes
+                        <SimpleTooltip
+                            text="Course flags for degree requirements, core curriculum, or special designations"
+                            delay={150}
+                            passthrough
+                        >
+                            <Info class="size-3 text-muted-foreground/50" />
+                        </SimpleTooltip>
+                    </span>
+                </h4>
+                <div class="flex flex-wrap gap-1.5">
+                    {#each course.attributes as attr}
+                        <SimpleTooltip
+                            text="Course attribute code"
+                            delay={150}
+                            passthrough
+                        >
+                            <span
+                                class="inline-flex text-xs font-medium bg-card border border-border rounded-md px-2 py-0.5 text-muted-foreground hover:text-foreground hover:border-foreground/20 transition-colors"
+                            >
+                                {attr}
+                            </span>
+                        </SimpleTooltip>
+                    {/each}
+                </div>
+            </div>
+        {/if}
+
+        <!-- Cross-list -->
+        {#if course.crossList}
+            <div>
+                <h4 class="text-sm text-foreground mb-2">
+                    <span class="inline-flex items-center gap-1">
+                        Cross-list
+                        <SimpleTooltip
+                            text="Cross-listed sections share enrollment across multiple course numbers. Students in any linked section attend the same class."
+                            delay={150}
+                            passthrough
+                        >
+                            <Info class="size-3 text-muted-foreground/50" />
+                        </SimpleTooltip>
+                    </span>
+                </h4>
+                <Tooltip.Root delayDuration={150} disableHoverableContent>
+                    <Tooltip.Trigger>
+                        <span
+                            class="inline-flex items-center gap-1.5 text-foreground font-mono"
+                        >
+                            <span
+                                class="bg-card border border-border rounded-md px-2 py-0.5 text-xs font-medium"
+                            >
+                                {course.crossList}
+                            </span>
+                            {#if course.crossListCount != null && course.crossListCapacity != null}
+                                <span class="text-muted-foreground text-xs">
+                                    {formatNumber(course.crossListCount)}/{formatNumber(course.crossListCapacity)}
+                                </span>
+                            {/if}
+                        </span>
+                    </Tooltip.Trigger>
+                    <Tooltip.Content sideOffset={6} class={tooltipContentClass}>
+                        Group <span class="font-mono font-medium"
+                            >{course.crossList}</span
+                        >
+                        {#if course.crossListCount != null && course.crossListCapacity != null}
+                            — {formatNumber(course.crossListCount)} enrolled across {formatNumber(course.crossListCapacity)}
+                            shared seats
+                        {/if}
+                    </Tooltip.Content>
+                </Tooltip.Root>
+            </div>
+        {/if}
+
+        <!-- Waitlist -->
+        {#if course.waitCapacity > 0}
+            <div>
+                <h4 class="text-sm text-foreground mb-2">Waitlist</h4>
+                <span class="text-2foreground"
+                    >{formatNumber(course.waitCount)} / {formatNumber(course.waitCapacity)}</span
+                >
+            </div>
+        {/if}
+    </div>
 </div>
@@ -2,14 +2,29 @@
 import type { CourseResponse } from "$lib/api";
 import {
  abbreviateInstructor,
-  formatTime,
+  concernAccentColor,
+  formatLocationDisplay,
+  formatLocationTooltip,
  formatMeetingDays,
-  formatLocation,
+  formatMeetingTimesTooltip,
+  formatTimeRange,
+  getDeliveryConcern,
  getPrimaryInstructor,
  isMeetingTimeTBA,
  isTimeTBA,
+  openSeats,
+  seatsColor,
+  seatsDotColor,
+  ratingStyle,
+  rmpUrl,
+  RMP_CONFIDENCE_THRESHOLD,
 } from "$lib/course";
+import { themeStore } from "$lib/stores/theme.svelte";
+import { useClipboard } from "$lib/composables/useClipboard.svelte";
+import { useOverlayScrollbars } from "$lib/composables/useOverlayScrollbars.svelte";
 import CourseDetail from "./CourseDetail.svelte";
+import { fade, fly, slide } from "svelte/transition";
+import { flip } from "svelte/animate";
 import { createSvelteTable, FlexRender } from "$lib/components/ui/data-table/index.js";
 import {
  getCoreRowModel,
@@ -19,9 +34,20 @@ import {
  type VisibilityState,
  type Updater,
 } from "@tanstack/table-core";
-import { ArrowUp, ArrowDown, ArrowUpDown, Columns3, Check, RotateCcw } from "@lucide/svelte";
-import { DropdownMenu, ContextMenu } from "bits-ui";
-import { fade, fly } from "svelte/transition";
+import {
+  ArrowUp,
+  ArrowDown,
+  ArrowUpDown,
+  Columns3,
+  Check,
+  RotateCcw,
+  Star,
+  Triangle,
+  ExternalLink,
+} from "@lucide/svelte";
+import { DropdownMenu, ContextMenu, Tooltip } from "bits-ui";
+import { cn, tooltipContentClass, formatNumber } from "$lib/utils";
+import SimpleTooltip from "./SimpleTooltip.svelte";

 let {
  courses,
@@ -29,23 +55,37 @@ let {
  sorting = [],
  onSortingChange,
  manualSorting = false,
+  subjectMap = {},
 }: {
  courses: CourseResponse[];
  loading: boolean;
  sorting?: SortingState;
  onSortingChange?: (sorting: SortingState) => void;
  manualSorting?: boolean;
+  subjectMap?: Record<string, string>;
 } = $props();

 let expandedCrn: string | null = $state(null);
+let tableWrapper: HTMLDivElement = undefined!;
+const clipboard = useClipboard(1000);
+
+// Collapse expanded row when the dataset changes to avoid stale detail rows
+// and FLIP position calculation glitches from lingering expanded content
+$effect(() => {
+  courses; // track dependency
+  expandedCrn = null;
+});
+
+useOverlayScrollbars(() => tableWrapper, {
+  overflow: { x: "scroll", y: "hidden" },
+  scrollbars: { autoHide: "never" },
+});

 // Column visibility state
 let columnVisibility: VisibilityState = $state({});

-const DEFAULT_VISIBILITY: VisibilityState = {};
-
 function resetColumnVisibility() {
-  columnVisibility = { ...DEFAULT_VISIBILITY };
+  columnVisibility = {};
 }

 function handleVisibilityChange(updater: Updater<VisibilityState>) {
@@ -59,40 +99,22 @@ function toggleRow(crn: string) {
  expandedCrn = expandedCrn === crn ? null : crn;
 }

-function openSeats(course: CourseResponse): number {
-  return Math.max(0, course.maxEnrollment - course.enrollment);
-}
-
-function seatsColor(course: CourseResponse): string {
-  const open = openSeats(course);
-  if (open === 0) return "text-status-red";
-  if (open <= 5) return "text-yellow-500";
-  return "text-status-green";
-}
-
-function seatsDotColor(course: CourseResponse): string {
-  const open = openSeats(course);
-  if (open === 0) return "bg-red-500";
-  if (open <= 5) return "bg-yellow-500";
-  return "bg-green-500";
-}
-
 function primaryInstructorDisplay(course: CourseResponse): string {
  const primary = getPrimaryInstructor(course.instructors);
  if (!primary) return "Staff";
  return abbreviateInstructor(primary.displayName);
 }

-function ratingColor(rating: number): string {
-  if (rating >= 4.0) return "text-status-green";
-  if (rating >= 3.0) return "text-yellow-500";
-  return "text-status-red";
-}
-
-function primaryRating(course: CourseResponse): { rating: number; count: number } | null {
+function primaryRating(
+  course: CourseResponse
+): { rating: number; count: number; legacyId: number | null } | null {
  const primary = getPrimaryInstructor(course.instructors);
  if (!primary?.rmpRating) return null;
-  return { rating: primary.rmpRating, count: primary.rmpNumRatings ?? 0 };
+  return {
+    rating: primary.rmpRating,
+    count: primary.rmpNumRatings ?? 0,
+    legacyId: primary.rmpLegacyId ?? null,
+  };
 }

 function timeIsTBA(course: CourseResponse): boolean {
@@ -132,14 +154,14 @@ const columns: ColumnDef<CourseResponse, unknown>[] = [
    accessorFn: (row) => {
      if (row.meetingTimes.length === 0) return "";
      const mt = row.meetingTimes[0];
-      return `${formatMeetingDays(mt)} ${formatTime(mt.begin_time)}`;
+      return `${formatMeetingDays(mt)} ${formatTimeRange(mt.begin_time, mt.end_time)}`;
    },
    header: "Time",
    enableSorting: true,
  },
  {
    id: "location",
-    accessorFn: (row) => formatLocation(row) ?? "",
+    accessorFn: (row) => formatLocationDisplay(row) ?? "",
    header: "Location",
    enableSorting: false,
  },
@@ -167,6 +189,7 @@ const table = createSvelteTable({
  get data() {
    return courses;
  },
+  getRowId: (row) => String(row.crn),
  columns,
  state: {
    get sorting() {
@@ -189,264 +212,576 @@ const table = createSvelteTable({
 });
 </script>

-{#snippet columnVisibilityItems(variant: "dropdown" | "context")}
-  {#if variant === "dropdown"}
-    <DropdownMenu.Group>
-      <DropdownMenu.GroupHeading class="px-2 py-1.5 text-xs font-medium text-muted-foreground">
-        Toggle columns
-      </DropdownMenu.GroupHeading>
-      {#each columns as col}
-        {@const id = col.id!}
-        {@const label = typeof col.header === "string" ? col.header : id}
-        <DropdownMenu.CheckboxItem
-          checked={columnVisibility[id] !== false}
-          closeOnSelect={false}
-          onCheckedChange={(checked) => {
-            columnVisibility = { ...columnVisibility, [id]: checked };
-          }}
-          class="relative flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground"
+{#snippet columnVisibilityGroup(
+    Group: typeof DropdownMenu.Group,
+    GroupHeading: typeof DropdownMenu.GroupHeading,
+    CheckboxItem: typeof DropdownMenu.CheckboxItem,
+    Separator: typeof DropdownMenu.Separator,
+    Item: typeof DropdownMenu.Item,
+)}
+    <Group>
+        <GroupHeading
+            class="px-2 py-1.5 text-xs font-medium text-muted-foreground"
        >
-          {#snippet children({ checked })}
-            <span class="flex size-4 items-center justify-center rounded-sm border border-border">
-              {#if checked}
-                <Check class="size-3" />
-              {/if}
-            </span>
-            {label}
-          {/snippet}
-        </DropdownMenu.CheckboxItem>
-      {/each}
-    </DropdownMenu.Group>
+            Toggle columns
+        </GroupHeading>
+        {#each columns as col}
+            {@const id = col.id!}
+            {@const label = typeof col.header === "string" ? col.header : id}
+            <CheckboxItem
+                checked={columnVisibility[id] !== false}
+                closeOnSelect={false}
+                onCheckedChange={(checked) => {
+                    columnVisibility = {
+                        ...columnVisibility,
+                        [id]: checked,
+                    };
+                }}
+                class="relative flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-highlighted:bg-accent data-highlighted:text-accent-foreground"
+            >
+                {#snippet children({ checked })}
+                    <span
+                        class="flex size-4 items-center justify-center rounded-sm border border-border"
+                    >
+                        {#if checked}
+                            <Check class="size-3" />
+                        {/if}
+                    </span>
+                    {label}
+                {/snippet}
+            </CheckboxItem>
+        {/each}
+    </Group>
    {#if hasCustomVisibility}
-      <DropdownMenu.Separator class="mx-1 my-1 h-px bg-border" />
-      <DropdownMenu.Item
-        class="flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground"
-        onSelect={resetColumnVisibility}
-      >
-        <RotateCcw class="size-3.5" />
-        Reset to default
-      </DropdownMenu.Item>
-    {/if}
-  {:else}
-    <ContextMenu.Group>
-      <ContextMenu.GroupHeading class="px-2 py-1.5 text-xs font-medium text-muted-foreground">
-        Toggle columns
-      </ContextMenu.GroupHeading>
-      {#each columns as col}
-        {@const id = col.id!}
-        {@const label = typeof col.header === "string" ? col.header : id}
-        <ContextMenu.CheckboxItem
-          checked={columnVisibility[id] !== false}
-          closeOnSelect={false}
-          onCheckedChange={(checked) => {
-            columnVisibility = { ...columnVisibility, [id]: checked };
-          }}
-          class="relative flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground"
+        <Separator class="mx-1 my-1 h-px bg-border" />
+        <Item
+            class="flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-highlighted:bg-accent data-highlighted:text-accent-foreground"
+            onSelect={resetColumnVisibility}
        >
-          {#snippet children({ checked })}
-            <span class="flex size-4 items-center justify-center rounded-sm border border-border">
-              {#if checked}
-                <Check class="size-3" />
-              {/if}
-            </span>
-            {label}
-          {/snippet}
-        </ContextMenu.CheckboxItem>
-      {/each}
-    </ContextMenu.Group>
-    {#if hasCustomVisibility}
-      <ContextMenu.Separator class="mx-1 my-1 h-px bg-border" />
-      <ContextMenu.Item
-        class="flex items-center gap-2 rounded-sm px-2 py-1.5 text-sm cursor-pointer select-none outline-none data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground"
-        onSelect={resetColumnVisibility}
-      >
-        <RotateCcw class="size-3.5" />
-        Reset to default
-      </ContextMenu.Item>
+            <RotateCcw class="size-3.5" />
+            Reset to default
+        </Item>
    {/if}
-  {/if}
 {/snippet}

 <!-- Toolbar: View columns button -->
 <div class="flex items-center justify-end pb-2">
-  <DropdownMenu.Root>
-    <DropdownMenu.Trigger
-      class="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-2.5 py-1.5 text-xs font-medium text-muted-foreground hover:bg-accent hover:text-accent-foreground transition-colors cursor-pointer"
-    >
-      <Columns3 class="size-3.5" />
-      View
-    </DropdownMenu.Trigger>
-    <DropdownMenu.Portal>
-      <DropdownMenu.Content
-        class="z-50 min-w-[160px] rounded-md border border-border bg-card p-1 text-card-foreground shadow-lg"
-        align="end"
-        sideOffset={4}
-        forceMount
-      >
-        {#snippet child({ wrapperProps, props, open })}
-          {#if open}
-            <div {...wrapperProps}>
-              <div {...props} transition:fly={{ duration: 150, y: -10 }}>
-                {@render columnVisibilityItems("dropdown")}
-              </div>
-            </div>
-          {/if}
-        {/snippet}
-      </DropdownMenu.Content>
-    </DropdownMenu.Portal>
-  </DropdownMenu.Root>
+    <DropdownMenu.Root>
+        <DropdownMenu.Trigger
+            class="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-2.5 py-1.5 text-xs font-medium text-muted-foreground hover:bg-accent hover:text-accent-foreground transition-colors cursor-pointer"
+        >
+            <Columns3 class="size-3.5" />
+            View
+        </DropdownMenu.Trigger>
+        <DropdownMenu.Portal>
+            <DropdownMenu.Content
+                class="z-50 min-w-40 rounded-md border border-border bg-card p-1 text-card-foreground shadow-lg"
+                align="end"
+                sideOffset={4}
+                forceMount
+            >
+                {#snippet child({ wrapperProps, props, open })}
+                    {#if open}
+                        <div {...wrapperProps}>
+                            <div
+                                {...props}
+                                transition:fly={{ duration: 150, y: -10 }}
+                            >
+                                {@render columnVisibilityGroup(
+                                    DropdownMenu.Group,
+                                    DropdownMenu.GroupHeading,
+                                    DropdownMenu.CheckboxItem,
+                                    DropdownMenu.Separator,
+                                    DropdownMenu.Item,
+                                )}
+                            </div>
+                        </div>
+                    {/if}
+                {/snippet}
+            </DropdownMenu.Content>
+        </DropdownMenu.Portal>
+    </DropdownMenu.Root>
 </div>

 <!-- Table with context menu on header -->
-<div class="overflow-x-auto">
-  <ContextMenu.Root>
-    <ContextMenu.Trigger class="contents">
-      <table class="w-full border-collapse text-sm">
-        <thead>
-          {#each table.getHeaderGroups() as headerGroup}
-            <tr class="border-b border-border text-left text-muted-foreground">
-              {#each headerGroup.headers as header}
-                {#if header.column.getIsVisible()}
-                  <th
-                    class="py-2 px-2 font-medium {header.id === 'seats' ? 'text-right' : ''}"
-                    class:cursor-pointer={header.column.getCanSort()}
-                    class:select-none={header.column.getCanSort()}
-                    onclick={header.column.getToggleSortingHandler()}
-                  >
-                    {#if header.column.getCanSort()}
-                      <span class="inline-flex items-center gap-1">
-                        {#if typeof header.column.columnDef.header === "string"}
-                          {header.column.columnDef.header}
-                        {:else}
-                          <FlexRender content={header.column.columnDef.header} context={header.getContext()} />
-                        {/if}
-                        {#if header.column.getIsSorted() === "asc"}
-                          <ArrowUp class="size-3.5" />
-                        {:else if header.column.getIsSorted() === "desc"}
-                          <ArrowDown class="size-3.5" />
-                        {:else}
-                          <ArrowUpDown class="size-3.5 text-muted-foreground/40" />
-                        {/if}
-                      </span>
-                    {:else if typeof header.column.columnDef.header === "string"}
-                      {header.column.columnDef.header}
-                    {:else}
-                      <FlexRender content={header.column.columnDef.header} context={header.getContext()} />
-                    {/if}
-                  </th>
+<div bind:this={tableWrapper} class="overflow-x-auto">
+    <ContextMenu.Root>
+        <ContextMenu.Trigger class="contents">
+            <table class="w-full min-w-160 border-collapse text-sm">
+                <thead>
+                    {#each table.getHeaderGroups() as headerGroup}
+                        <tr
+                            class="border-b border-border text-left text-muted-foreground"
+                        >
+                            {#each headerGroup.headers as header}
+                                {#if header.column.getIsVisible()}
+                                    <th
+                                        class="py-2 px-2 font-medium {header.id ===
+                                        'seats'
+                                            ? 'text-right'
+                                            : ''}"
+                                        class:cursor-pointer={header.column.getCanSort()}
+                                        class:select-none={header.column.getCanSort()}
+                                        onclick={header.column.getToggleSortingHandler()}
+                                    >
+                                        {#if header.column.getCanSort()}
+                                            <span
+                                                class="inline-flex items-center gap-1"
+                                            >
+                                                {#if typeof header.column.columnDef.header === "string"}
+                                                    {header.column.columnDef
+                                                        .header}
+                                                {:else}
+                                                    <FlexRender
+                                                        content={header.column
+                                                            .columnDef.header}
+                                                        context={header.getContext()}
+                                                    />
+                                                {/if}
+                                                {#if header.column.getIsSorted() === "asc"}
+                                                    <ArrowUp class="size-3.5" />
+                                                {:else if header.column.getIsSorted() === "desc"}
+                                                    <ArrowDown
+                                                        class="size-3.5"
+                                                    />
+                                                {:else}
+                                                    <ArrowUpDown
+                                                        class="size-3.5 text-muted-foreground/40"
+                                                    />
+                                                {/if}
+                                            </span>
+                                        {:else if typeof header.column.columnDef.header === "string"}
+                                            {header.column.columnDef.header}
+                                        {:else}
+                                            <FlexRender
+                                                content={header.column.columnDef
+                                                    .header}
+                                                context={header.getContext()}
+                                            />
+                                        {/if}
+                                    </th>
+                                {/if}
+                            {/each}
+                        </tr>
+                    {/each}
+                </thead>
+                {#if loading && courses.length === 0}
+                    <tbody>
+                        {#each Array(5) as _}
+                            <tr class="border-b border-border">
+                                {#each table.getVisibleLeafColumns() as col}
+                                    <td class="py-2.5 px-2">
+                                        <div
+                                            class="h-4 bg-muted rounded animate-pulse {col.id ===
+                                            'seats'
+                                                ? 'w-14 ml-auto'
+                                                : col.id === 'title'
+                                                  ? 'w-40'
+                                                  : col.id === 'crn'
+                                                    ? 'w-10'
+                                                    : 'w-20'}"
+                                        ></div>
+                                    </td>
+                                {/each}
+                            </tr>
+                        {/each}
+                    </tbody>
+                {:else if courses.length === 0}
+                    <tbody>
+                        <tr>
+                            <td
+                                colspan={visibleColumnIds.length}
+                                class="py-12 text-center text-muted-foreground"
+                            >
+                                No courses found. Try adjusting your filters.
+                            </td>
+                        </tr>
+                    </tbody>
+                {:else}
+                    <!-- No out: transition — Svelte outros break table layout (tbody loses positioning and overlaps) -->
+                    {#each table.getRowModel().rows as row, i (row.id)}
+                        {@const course = row.original}
+                        <tbody
+                            animate:flip={{ duration: 300 }}
+                            in:fade={{
+                                duration: 200,
+                                delay: Math.min(i * 20, 400),
+                            }}
+                        >
+                            <tr
+                                class="border-b border-border cursor-pointer hover:bg-muted/50 transition-colors whitespace-nowrap {expandedCrn ===
+                                course.crn
+                                    ? 'bg-muted/30'
+                                    : ''}"
+                                onclick={() => toggleRow(course.crn)}
+                            >
+                                {#each row.getVisibleCells() as cell (cell.id)}
+                                    {@const colId = cell.column.id}
+                                    {#if colId === "crn"}
+                                        <td class="py-2 px-2 relative">
+                                            <button
+                                                class="relative inline-flex items-center rounded-full px-2 py-0.5 border border-border/50 bg-muted/20 hover:bg-muted/40 hover:border-foreground/30 transition-colors duration-150 cursor-copy focus-visible:outline-2 focus-visible:outline-offset-1 focus-visible:outline-ring font-mono text-xs text-muted-foreground/70"
+                                                onclick={(e) =>
+                                                    clipboard.copy(
+                                                        course.crn,
+                                                        e,
+                                                    )}
+                                                onkeydown={(e) => {
+                                                    if (
+                                                        e.key === "Enter" ||
+                                                        e.key === " "
+                                                    ) {
+                                                        e.preventDefault();
+                                                        clipboard.copy(
+                                                            course.crn,
+                                                            e,
+                                                        );
+                                                    }
+                                                }}
+                                                aria-label="Copy CRN {course.crn} to clipboard"
+                                            >
+                                                {course.crn}
+                                                {#if clipboard.copiedValue === course.crn}
+                                                    <span
+                                                        class="absolute -top-8 left-1/2 -translate-x-1/2 whitespace-nowrap text-xs px-2 py-1 rounded-md bg-green-500/10 border border-green-500/20 text-green-700 dark:text-green-300 pointer-events-none z-10"
+                                                        in:fade={{
+                                                            duration: 100,
+                                                        }}
+                                                        out:fade={{
+                                                            duration: 200,
+                                                        }}
+                                                    >
+                                                        Copied!
+                                                    </span>
+                                                {/if}
+                                            </button>
+                                        </td>
+                                    {:else if colId === "course_code"}
+                                        {@const subjectDesc =
+                                            subjectMap[course.subject]}
+                                        <td class="py-2 px-2 whitespace-nowrap">
+                                            <SimpleTooltip
+                                                text={subjectDesc
+                                                    ? `${subjectDesc} ${course.courseNumber}`
+                                                    : `${course.subject} ${course.courseNumber}`}
+                                                delay={200}
+                                                side="bottom"
+                                                passthrough
+                                            >
+                                                <span class="font-semibold"
+                                                    >{course.subject}
+                                                    {course.courseNumber}</span
+                                                >{#if course.sequenceNumber}<span
+                                                        class="text-muted-foreground"
+                                                        >-{course.sequenceNumber}</span
+                                                    >{/if}
+                                            </SimpleTooltip>
+                                        </td>
+                                    {:else if colId === "title"}
+                                        <td
+                                            class="py-2 px-2 font-medium max-w-50 truncate"
+                                        >
+                                            <SimpleTooltip
+                                                text={course.title}
+                                                delay={200}
+                                                side="bottom"
+                                                passthrough
+                                            >
+                                                <span class="block truncate"
+                                                    >{course.title}</span
+                                                >
+                                            </SimpleTooltip>
+                                        </td>
+                                    {:else if colId === "instructor"}
+                                        {@const primary = getPrimaryInstructor(
+                                            course.instructors,
+                                        )}
+                                        {@const display =
+                                            primaryInstructorDisplay(course)}
+                                        {@const commaIdx =
+                                            display.indexOf(", ")}
+                                        {@const ratingData =
+                                            primaryRating(course)}
+                                        <td class="py-2 px-2 whitespace-nowrap">
+                                            {#if display === "Staff"}
+                                                <span
+                                                    class="text-xs text-muted-foreground/60 uppercase"
+                                                    >Staff</span
+                                                >
+                                            {:else}
+                                                <SimpleTooltip
+                                                    text={primary?.displayName ??
+                                                        "Staff"}
+                                                    delay={200}
+                                                    side="bottom"
+                                                    passthrough
+                                                >
+                                                    {#if commaIdx !== -1}
+                                                        <span
+                                                            >{display.slice(
+                                                                0,
+                                                                commaIdx,
+                                                            )},
+                                                            <span
+                                                                class="text-muted-foreground"
+                                                                >{display.slice(
+                                                                    commaIdx +
+                                                                        1,
+                                                                )}</span
+                                                            ></span
+                                                        >
+                                                    {:else}
+                                                        <span>{display}</span>
+                                                    {/if}
+                                                </SimpleTooltip>
+                                            {/if}
+                                            {#if ratingData}
+                                                {@const lowConfidence =
+                                                    ratingData.count <
+                                                    RMP_CONFIDENCE_THRESHOLD}
+                                                <Tooltip.Root
+                                                    delayDuration={150}
+                                                >
+                                                    <Tooltip.Trigger>
+                                                        <span
+                                                            class="ml-1 text-xs font-medium inline-flex items-center gap-0.5"
+                                                            style={ratingStyle(
+                                                                ratingData.rating,
+                                                                themeStore.isDark,
+                                                            )}
+                                                        >
+                                                            {ratingData.rating.toFixed(
+                                                                1,
+                                                            )}
+                                                            {#if lowConfidence}
+                                                                <Triangle
+                                                                    class="size-2 fill-current"
+                                                                />
+                                                            {:else}
+                                                                <Star
+                                                                    class="size-2.5 fill-current"
+                                                                />
+                                                            {/if}
+                                                        </span>
+                                                    </Tooltip.Trigger>
+                                                    <Tooltip.Content
+                                                        side="bottom"
+                                                        sideOffset={6}
+                                                        class={cn(
+                                                            tooltipContentClass,
+                                                            "px-2.5 py-1.5",
+                                                        )}
+                                                    >
+                                                        <span
+                                                            class="inline-flex items-center gap-1.5 text-xs"
+                                                        >
+                                                            {ratingData.rating.toFixed(
+                                                                1,
+                                                            )}/5 · {formatNumber(ratingData.count)}
+                                                            ratings
+                                                            {#if (ratingData.count ?? 0) < RMP_CONFIDENCE_THRESHOLD}
+                                                                (low)
+                                                            {/if}
+                                                            {#if ratingData.legacyId != null}
+                                                                ·
+                                                                <a
+                                                                    href={rmpUrl(
+                                                                        ratingData.legacyId,
+                                                                    )}
+                                                                    target="_blank"
+                                                                    rel="noopener"
+                                                                    class="inline-flex items-center gap-0.5 text-muted-foreground hover:text-foreground transition-colors"
+                                                                >
+                                                                    RMP
+                                                                    <ExternalLink
+                                                                        class="size-3"
+                                                                    />
+                                                                </a>
+                                                            {/if}
+                                                        </span>
+                                                    </Tooltip.Content>
+                                                </Tooltip.Root>
+                                            {/if}
+                                        </td>
+                                    {:else if colId === "time"}
+                                        <td class="py-2 px-2 whitespace-nowrap">
+                                            <SimpleTooltip
+                                                text={formatMeetingTimesTooltip(
+                                                    course.meetingTimes,
+                                                )}
+                                                passthrough
+                                            >
+                                                {#if timeIsTBA(course)}
+                                                    <span
+                                                        class="text-xs text-muted-foreground/60"
+                                                        >TBA</span
+                                                    >
+                                                {:else}
+                                                    {@const mt =
+                                                        course.meetingTimes[0]}
+                                                    <span>
+                                                        {#if !isMeetingTimeTBA(mt)}
+                                                            <span
+                                                                class="font-mono font-medium"
+                                                                >{formatMeetingDays(
+                                                                    mt,
+                                                                )}</span
+                                                            >
+                                                            {" "}
+                                                        {/if}
+                                                        {#if !isTimeTBA(mt)}
+                                                            <span
+                                                                class="text-muted-foreground"
+                                                                >{formatTimeRange(
+                                                                    mt.begin_time,
+                                                                    mt.end_time,
+                                                                )}</span
+                                                            >
+                                                        {:else}
+                                                            <span
+                                                                class="text-xs text-muted-foreground/60"
+                                                                >TBA</span
+                                                            >
+                                                        {/if}
+                                                        {#if course.meetingTimes.length > 1}
+                                                            <span
+                                                                class="ml-1 text-xs text-muted-foreground/70 font-medium"
+                                                                >+{course
+                                                                    .meetingTimes
+                                                                    .length -
+                                                                    1}</span
+                                                            >
+                                                        {/if}
+                                                    </span>
+                                                {/if}
+                                            </SimpleTooltip>
+                                        </td>
+                                    {:else if colId === "location"}
+                                        {@const concern =
+                                            getDeliveryConcern(course)}
+                                        {@const accentColor =
+                                            concernAccentColor(concern)}
+                                        {@const locTooltip =
+                                            formatLocationTooltip(course)}
+                                        {@const locDisplay =
+                                            formatLocationDisplay(course)}
+                                        <td class="py-2 px-2 whitespace-nowrap">
+                                            {#if locTooltip}
+                                                <SimpleTooltip
+                                                    text={locTooltip}
+                                                    delay={200}
+                                                    passthrough
+                                                >
+                                                    <span
+                                                        class="text-muted-foreground"
+                                                        class:pl-2={accentColor !==
+                                                            null}
+                                                        style:border-left={accentColor
+                                                            ? `2px solid ${accentColor}`
+                                                            : undefined}
+                                                    >
+                                                        {locDisplay ?? "—"}
+                                                    </span>
+                                                </SimpleTooltip>
+                                            {:else if locDisplay}
+                                                <span
+                                                    class="text-muted-foreground"
+                                                >
+                                                    {locDisplay}
+                                                </span>
+                                            {:else}
+                                                <span
+                                                    class="text-xs text-muted-foreground/50"
+                                                    >—</span
+                                                >
+                                            {/if}
+                                        </td>
+                                    {:else if colId === "seats"}
+                                        <td
+                                            class="py-2 px-2 text-right whitespace-nowrap"
+                                        >
+                                            <SimpleTooltip
+                                                text="{formatNumber(openSeats(
+                                                    course,
+                                                ))} of {formatNumber(course.maxEnrollment)} seats open, {formatNumber(course.enrollment)} enrolled{course.waitCount >
+                                                0
+                                                    ? `, ${formatNumber(course.waitCount)} waitlisted`
+                                                    : ''}"
+                                                delay={200}
+                                                side="left"
+                                                passthrough
+                                            >
+                                                <span
+                                                    class="inline-flex items-center gap-1.5"
+                                                >
+                                                    <span
+                                                        class="size-1.5 rounded-full {seatsDotColor(
+                                                            course,
+                                                        )} shrink-0"
+                                                    ></span>
+                                                    <span
+                                                        class="{seatsColor(
+                                                            course,
+                                                        )} font-medium tabular-nums"
+                                                        >{#if openSeats(course) === 0}Full{:else}{openSeats(
+                                                                course,
+                                                            )} open{/if}</span
+                                                    >
+                                                    <span
+                                                        class="text-muted-foreground/60 tabular-nums"
+                                                        >{formatNumber(course.enrollment)}/{formatNumber(course.maxEnrollment)}{#if course.waitCount > 0}
+                                                            · WL {formatNumber(course.waitCount)}/{formatNumber(course.waitCapacity)}{/if}</span
+                                                    >
+                                                </span>
+                                            </SimpleTooltip>
+                                        </td>
+                                    {/if}
+                                {/each}
+                            </tr>
+                            {#if expandedCrn === course.crn}
+                                <tr>
+                                    <td
+                                        colspan={visibleColumnIds.length}
+                                        class="p-0"
+                                    >
+                                        <div
+                                            transition:slide={{ duration: 200 }}
+                                        >
+                                            <CourseDetail {course} />
+                                        </div>
+                                    </td>
+                                </tr>
+                            {/if}
+                        </tbody>
+                    {/each}
                {/if}
-              {/each}
-            </tr>
-          {/each}
-        </thead>
-        <tbody>
-          {#if loading && courses.length === 0}
-            {#each Array(5) as _}
-              <tr class="border-b border-border">
-                {#each table.getVisibleLeafColumns() as col}
-                  <td class="py-2.5 px-2">
-                    <div class="h-4 bg-muted rounded animate-pulse {col.id === 'seats' ? 'w-14 ml-auto' : col.id === 'title' ? 'w-40' : col.id === 'crn' ? 'w-10' : 'w-20'}"></div>
-                  </td>
-                {/each}
-              </tr>
-            {/each}
-          {:else if courses.length === 0}
-            <tr>
-              <td colspan={visibleColumnIds.length} class="py-12 text-center text-muted-foreground">
-                No courses found. Try adjusting your filters.
-              </td>
-            </tr>
-          {:else}
-            {#each table.getRowModel().rows as row (row.id)}
-              {@const course = row.original}
-              <tr
-                class="border-b border-border cursor-pointer hover:bg-muted/50 transition-colors whitespace-nowrap {expandedCrn === course.crn ? 'bg-muted/30' : ''}"
-                onclick={() => toggleRow(course.crn)}
-              >
-                {#each row.getVisibleCells() as cell (cell.id)}
-                  {@const colId = cell.column.id}
-                  {#if colId === "crn"}
-                    <td class="py-2 px-2 font-mono text-xs text-muted-foreground/70">{course.crn}</td>
-                  {:else if colId === "course_code"}
-                    <td class="py-2 px-2 whitespace-nowrap">
-                      <span class="font-semibold">{course.subject} {course.courseNumber}</span>{#if course.sequenceNumber}<span class="text-muted-foreground">-{course.sequenceNumber}</span>{/if}
-                    </td>
-                  {:else if colId === "title"}
-                    <td class="py-2 px-2 font-medium">{course.title}</td>
-                  {:else if colId === "instructor"}
-                    <td class="py-2 px-2 whitespace-nowrap">
-                      {primaryInstructorDisplay(course)}
-                      {#if primaryRating(course)}
-                        {@const r = primaryRating(course)!}
-                        <span
-                          class="ml-1 text-xs font-medium {ratingColor(r.rating)}"
-                          title="{r.rating.toFixed(1)}/5 ({r.count} ratings)"
-                        >{r.rating.toFixed(1)}★</span>
-                      {/if}
-                    </td>
-                  {:else if colId === "time"}
-                    <td class="py-2 px-2 whitespace-nowrap">
-                      {#if timeIsTBA(course)}
-                        <span class="text-xs text-muted-foreground/60">TBA</span>
-                      {:else}
-                        {@const mt = course.meetingTimes[0]}
-                        {#if !isMeetingTimeTBA(mt)}
-                          <span class="font-mono font-medium">{formatMeetingDays(mt)}</span>
-                          {" "}
-                        {/if}
-                        {#if !isTimeTBA(mt)}
-                          <span class="text-muted-foreground">{formatTime(mt.begin_time)}&ndash;{formatTime(mt.end_time)}</span>
-                        {:else}
-                          <span class="text-xs text-muted-foreground/60">TBA</span>
-                        {/if}
-                      {/if}
-                    </td>
-                  {:else if colId === "location"}
-                    <td class="py-2 px-2 whitespace-nowrap">
-                      {#if formatLocation(course)}
-                        <span class="text-muted-foreground">{formatLocation(course)}</span>
-                      {:else}
-                        <span class="text-xs text-muted-foreground/50">—</span>
-                      {/if}
-                    </td>
-                  {:else if colId === "seats"}
-                    <td class="py-2 px-2 text-right whitespace-nowrap">
-                      <span class="inline-flex items-center gap-1.5">
-                        <span class="size-1.5 rounded-full {seatsDotColor(course)} shrink-0"></span>
-                        <span class="{seatsColor(course)} font-medium tabular-nums">{#if openSeats(course) === 0}Full{:else}{openSeats(course)} open{/if}</span>
-                        <span class="text-muted-foreground/60 tabular-nums">{course.enrollment}/{course.maxEnrollment}{#if course.waitCount > 0} · WL {course.waitCount}/{course.waitCapacity}{/if}</span>
-                      </span>
-                    </td>
-                  {/if}
-                {/each}
-              </tr>
-              {#if expandedCrn === course.crn}
-                <tr>
-                  <td colspan={visibleColumnIds.length} class="p-0">
-                    <CourseDetail {course} />
-                  </td>
-                </tr>
-              {/if}
-            {/each}
-          {/if}
-        </tbody>
-      </table>
-    </ContextMenu.Trigger>
-    <ContextMenu.Portal>
-      <ContextMenu.Content
-        class="z-50 min-w-[160px] rounded-md border border-border bg-card p-1 text-card-foreground shadow-lg"
-        forceMount
-      >
-        {#snippet child({ wrapperProps, props, open })}
-          {#if open}
-            <div {...wrapperProps}>
-              <div {...props} in:fade={{ duration: 100 }} out:fade={{ duration: 100 }}>
-                {@render columnVisibilityItems("context")}
-              </div>
-            </div>
-          {/if}
-        {/snippet}
-      </ContextMenu.Content>
-    </ContextMenu.Portal>
-  </ContextMenu.Root>
+            </table>
+        </ContextMenu.Trigger>
+        <ContextMenu.Portal>
+            <ContextMenu.Content
+                class="z-50 min-w-40 rounded-md border border-border bg-card p-1 text-card-foreground shadow-lg"
+                forceMount
+            >
+                {#snippet child({ wrapperProps, props, open })}
+                    {#if open}
+                        <div {...wrapperProps}>
+                            <div
+                                {...props}
+                                in:fade={{ duration: 100 }}
+                                out:fade={{ duration: 100 }}
+                            >
+                                {@render columnVisibilityGroup(
+                                    ContextMenu.Group,
+                                    ContextMenu.GroupHeading,
+                                    ContextMenu.CheckboxItem,
+                                    ContextMenu.Separator,
+                                    ContextMenu.Item,
+                                )}
+                            </div>
+                        </div>
+                    {/if}
+                {/snippet}
+            </ContextMenu.Content>
+        </ContextMenu.Portal>
+    </ContextMenu.Root>
 </div>
@@ -0,0 +1,56 @@
+<script lang="ts">
+import { page } from "$app/state";
+import { TriangleAlert, RotateCcw } from "@lucide/svelte";
+
+interface Props {
+  /** Heading shown in the error card */
+  title?: string;
+  /** The error value from svelte:boundary */
+  error: unknown;
+  /** Reset callback from svelte:boundary */
+  reset: () => void;
+}
+
+let { title = "Something went wrong", error, reset }: Props = $props();
+
+let errorName = $derived(error instanceof Error ? error.constructor.name : "Error");
+let errorMessage = $derived(error instanceof Error ? error.message : String(error));
+let errorStack = $derived(error instanceof Error ? error.stack : null);
+</script>
+
+<div class="flex items-center justify-center py-16 px-4">
+  <div class="w-full max-w-lg rounded-lg border border-status-red/25 bg-status-red/5 overflow-hidden text-sm">
+    <div class="px-4 py-2.5 border-b border-status-red/15 flex items-center justify-between gap-4">
+      <div class="flex items-center gap-2 text-status-red">
+        <TriangleAlert size={16} strokeWidth={2.25} />
+        <span class="font-semibold">{title}</span>
+      </div>
+      <span class="text-xs text-muted-foreground font-mono">{page.url.pathname}</span>
+    </div>
+
+    <div class="px-4 py-3 border-b border-status-red/15">
+      <span class="text-xs text-muted-foreground/70 font-mono">{errorName}</span>
+      <pre class="mt-1 text-xs text-foreground/80 overflow-auto whitespace-pre-wrap break-words">{errorMessage}</pre>
+    </div>
+
+    {#if errorStack}
+      <details class="border-b border-status-red/15">
+        <summary class="px-4 py-2 text-xs text-muted-foreground/70 cursor-pointer hover:text-muted-foreground select-none">
+          Stack trace
+        </summary>
+        <pre class="px-4 py-3 text-xs text-muted-foreground/60 overflow-auto whitespace-pre-wrap break-words max-h-48">{errorStack}</pre>
+      </details>
+    {/if}
+
+    <div class="px-4 py-2.5 flex items-center justify-end gap-3">
+      <span class="text-xs text-muted-foreground/60">Retries this section, not the full page</span>
+      <button
+        class="shrink-0 cursor-pointer inline-flex items-center gap-1.5 rounded-md bg-status-red px-3 py-1.5 text-sm font-medium text-white hover:brightness-110 transition-all"
+        onclick={reset}
+      >
+        <RotateCcw size={14} strokeWidth={2.25} />
+        Try again
+      </button>
+    </div>
+  </div>
+</div>
@@ -0,0 +1,36 @@
+<script lang="ts">
+import { cn } from "$lib/utils";
+
+let {
+  commitHash,
+  showStatusLink = true,
+  class: className,
+}: {
+  commitHash?: string | null;
+  showStatusLink?: boolean;
+  class?: string;
+} = $props();
+</script>
+
+<div class={cn("flex justify-center items-center gap-2 mt-auto pt-6 pb-4", className)}>
+  {#if __APP_VERSION__}
+    <span class="text-xs text-muted-foreground">v{__APP_VERSION__}</span>
+    <div class="w-px h-3 bg-muted-foreground opacity-30"></div>
+  {/if}
+  <a
+    href={commitHash
+      ? `https://github.com/Xevion/banner/commit/${commitHash}`
+      : "https://github.com/Xevion/banner"}
+    target="_blank"
+    rel="noopener noreferrer"
+    class="text-xs text-muted-foreground no-underline hover:underline"
+  >
+    GitHub
+  </a>
+  {#if showStatusLink}
+    <div class="w-px h-3 bg-muted-foreground opacity-30"></div>
+    <a href="/health" class="text-xs text-muted-foreground no-underline hover:underline">
+      Status
+    </a>
+  {/if}
+</div>
@@ -0,0 +1,58 @@
+<script lang="ts">
+import { page } from "$app/state";
+import { Search, User, Clock } from "@lucide/svelte";
+import { authStore } from "$lib/auth.svelte";
+import ThemeToggle from "./ThemeToggle.svelte";
+
+const staticTabs = [
+  { href: "/", label: "Search", icon: Search },
+  { href: "/timeline", label: "Timeline", icon: Clock },
+] as const;
+
+const APP_PREFIXES = ["/profile", "/settings", "/admin"];
+
+let profileTab = $derived({
+  href: authStore.isAuthenticated ? "/profile" : "/login",
+  label: authStore.isAuthenticated ? "Account" : "Login",
+  icon: User,
+});
+
+function isActive(tabHref: string): boolean {
+  if (tabHref === "/") return page.url.pathname === "/";
+  if (tabHref === "/profile") {
+    return APP_PREFIXES.some((p) => page.url.pathname.startsWith(p));
+  }
+  return page.url.pathname.startsWith(tabHref);
+}
+</script>
+
+<nav class="w-full flex justify-center pt-5 px-5">
+  <div class="w-full max-w-6xl flex items-center justify-between">
+    <!-- pointer-events-auto: root layout wraps nav in pointer-events-none overlay -->
+    <div class="flex items-center gap-1 rounded-lg bg-muted p-1 pointer-events-auto">
+      {#each staticTabs as tab}
+        <a
+          href={tab.href}
+          class="flex items-center gap-1.5 rounded-md px-3 py-1.5 text-sm font-medium transition-colors no-underline
+            {isActive(tab.href)
+              ? 'bg-background text-foreground shadow-sm'
+              : 'text-muted-foreground hover:text-foreground hover:bg-background/50'}"
+        >
+          <tab.icon size={15} strokeWidth={2} />
+          {tab.label}
+        </a>
+      {/each}
+      <a
+        href={profileTab.href}
+        class="flex items-center gap-1.5 rounded-md px-3 py-1.5 text-sm font-medium transition-colors no-underline
+          {isActive(profileTab.href)
+            ? 'bg-background text-foreground shadow-sm'
+            : 'text-muted-foreground hover:text-foreground hover:bg-background/50'}"
+      >
+        <User size={15} strokeWidth={2} />
+        {profileTab.label}
+      </a>
+      <ThemeToggle />
+    </div>
+  </div>
+</nav>
@@ -0,0 +1,76 @@
+<script lang="ts">
+import { navigationStore } from "$lib/stores/navigation.svelte";
+import type { Snippet } from "svelte";
+import { cubicOut } from "svelte/easing";
+import type { TransitionConfig } from "svelte/transition";
+
+type Axis = "horizontal" | "vertical";
+
+let {
+  key,
+  children,
+  axis = "horizontal",
+  inDelay = 0,
+  outDelay = 0,
+}: {
+  key: string;
+  children: Snippet;
+  axis?: Axis;
+  inDelay?: number;
+  outDelay?: number;
+} = $props();
+
+const DURATION = 400;
+const OFFSET = 40;
+
+function translate(axis: Axis, value: number): string {
+  return axis === "vertical" ? `translateY(${value}px)` : `translateX(${value}px)`;
+}
+
+function inTransition(_node: HTMLElement): TransitionConfig {
+  const dir = navigationStore.direction;
+  if (dir === "fade") {
+    return {
+      duration: DURATION,
+      delay: inDelay,
+      easing: cubicOut,
+      css: (t: number) => `opacity: ${t}`,
+    };
+  }
+  const offset = dir === "right" ? OFFSET : -OFFSET;
+  return {
+    duration: DURATION,
+    delay: inDelay,
+    easing: cubicOut,
+    css: (t: number) => `opacity: ${t}; transform: ${translate(axis, (1 - t) * offset)}`,
+  };
+}
+
+function outTransition(_node: HTMLElement): TransitionConfig {
+  const dir = navigationStore.direction;
+  const base = "position: absolute; top: 0; left: 0; width: 100%; height: 100%";
+  if (dir === "fade") {
+    return {
+      duration: DURATION,
+      delay: outDelay,
+      easing: cubicOut,
+      css: (t: number) => `${base}; opacity: ${t}`,
+    };
+  }
+  const offset = dir === "right" ? -OFFSET : OFFSET;
+  return {
+    duration: DURATION,
+    delay: outDelay,
+    easing: cubicOut,
+    css: (t: number) => `${base}; opacity: ${t}; transform: ${translate(axis, (1 - t) * offset)}`,
+  };
+}
+</script>
+
+<div class="relative flex flex-1 flex-col overflow-hidden">
+  {#key key}
+    <div in:inTransition out:outTransition class="flex flex-1 flex-col">
+      {@render children()}
+    </div>
+  {/key}
+</div>
@@ -1,4 +1,21 @@
 <script lang="ts">
+import { Select } from "bits-ui";
+import { ChevronUp, ChevronDown } from "@lucide/svelte";
+import type { Action } from "svelte/action";
+import { formatNumber } from "$lib/utils";
+
+const slideIn: Action<HTMLElement, number> = (node, direction) => {
+  if (direction !== 0) {
+    node.animate(
+      [
+        { transform: `translateX(${direction * 20}px)`, opacity: 0 },
+        { transform: "translateX(0)", opacity: 1 },
+      ],
+      { duration: 200, easing: "ease-out" }
+    );
+  }
+};
+
 let {
  totalCount,
  offset,
@@ -11,32 +28,140 @@ let {
  onPageChange: (newOffset: number) => void;
 } = $props();

+const currentPage = $derived(Math.floor(offset / limit) + 1);
+const totalPages = $derived(Math.ceil(totalCount / limit));
 const start = $derived(offset + 1);
 const end = $derived(Math.min(offset + limit, totalCount));
-const hasPrev = $derived(offset > 0);
-const hasNext = $derived(offset + limit < totalCount);
+
+// Track direction for slide animation
+let direction = $state(0);
+
+// 5 page slots: current-2, current-1, current, current+1, current+2
+const pageSlots = $derived([-2, -1, 0, 1, 2].map((delta) => currentPage + delta));
+
+function isSlotVisible(page: number): boolean {
+  return page >= 1 && page <= totalPages;
+}
+
+function goToPage(page: number) {
+  direction = page > currentPage ? 1 : -1;
+  onPageChange((page - 1) * limit);
+}
+
+// Build items array for the Select dropdown
+const pageItems = $derived(
+  Array.from({ length: totalPages }, (_, i) => ({
+    value: String(i + 1),
+    label: String(i + 1),
+  }))
+);
+
+const selectValue = $derived(String(currentPage));
 </script>

-{#if totalCount > 0}
-  <div class="flex items-center justify-between text-sm">
-    <span class="text-muted-foreground">
-      Showing {start}–{end} of {totalCount} courses
-    </span>
-    <div class="flex gap-2">
-      <button
-        disabled={!hasPrev}
-        onclick={() => onPageChange(offset - limit)}
-        class="border border-border bg-card text-foreground rounded-md px-3 py-1.5 text-sm disabled:opacity-40 disabled:cursor-not-allowed hover:bg-muted/50 transition-colors"
-      >
-        Previous
-      </button>
-      <button
-        disabled={!hasNext}
-        onclick={() => onPageChange(offset + limit)}
-        class="border border-border bg-card text-foreground rounded-md px-3 py-1.5 text-sm disabled:opacity-40 disabled:cursor-not-allowed hover:bg-muted/50 transition-colors"
-      >
-        Next
-      </button>
+{#if totalCount > 0 && totalPages > 1}
+  <div class="flex items-start text-xs -mt-3 pl-2">
+    <!-- Left zone: result count -->
+    <div class="flex-1">
+      <span class="text-muted-foreground">
+        Showing {formatNumber(start)}&ndash;{formatNumber(end)} of {formatNumber(totalCount)} courses
+      </span>
    </div>
+
+    <!-- Center zone: page buttons -->
+    <div class="flex items-center gap-1">
+      {#key currentPage}
+        {#each pageSlots as page, i (i)}
+          {#if i === 2}
+            <!-- Center slot: current page with dropdown trigger -->
+            <Select.Root
+              type="single"
+              value={selectValue}
+              onValueChange={(v) => {
+                if (v) goToPage(Number(v));
+              }}
+              items={pageItems}
+            >
+              <Select.Trigger
+                class="inline-flex items-center justify-center gap-1 w-auto min-w-9 h-9 px-2.5
+                       rounded-md text-sm font-medium tabular-nums
+                       border border-border bg-card text-foreground
+                       hover:bg-muted/50 active:bg-muted transition-colors
+                       cursor-pointer select-none outline-none
+                       focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background"
+                aria-label="Page {currentPage} of {totalPages}, click to select page"
+              >
+                <span use:slideIn={direction}>{currentPage}</span>
+                <ChevronUp class="size-3 text-muted-foreground" />
+              </Select.Trigger>
+              <Select.Portal>
+                <Select.Content
+                  class="border border-border bg-card shadow-md outline-hidden z-50
+                         max-h-72 min-w-16 w-auto
+                         select-none rounded-md p-1
+                         data-[state=open]:animate-in data-[state=closed]:animate-out
+                         data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0
+                         data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95
+                         data-[side=top]:slide-in-from-bottom-2
+                         data-[side=bottom]:slide-in-from-top-2"
+                  side="top"
+                  sideOffset={6}
+                >
+                  <Select.ScrollUpButton class="flex w-full items-center justify-center py-0.5">
+                    <ChevronUp class="size-3.5 text-muted-foreground" />
+                  </Select.ScrollUpButton>
+                  <Select.Viewport class="p-0.5">
+                    {#each pageItems as item (item.value)}
+                      <Select.Item
+                        class="rounded-sm outline-hidden flex h-8 w-full select-none items-center
+                               justify-center px-3 text-sm tabular-nums
+                               data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground
+                               data-[selected]:font-semibold"
+                        value={item.value}
+                        label={item.label}
+                      >
+                        {item.label}
+                      </Select.Item>
+                    {/each}
+                  </Select.Viewport>
+                  <Select.ScrollDownButton class="flex w-full items-center justify-center py-0.5">
+                    <ChevronDown class="size-3.5 text-muted-foreground" />
+                  </Select.ScrollDownButton>
+                </Select.Content>
+              </Select.Portal>
+            </Select.Root>
+          {:else}
+            <!-- Side slot: navigable page button or invisible placeholder -->
+            <button
+              class="inline-flex items-center justify-center w-9 h-9
+                     rounded-md text-sm tabular-nums
+                     text-muted-foreground
+                     hover:bg-muted/50 hover:text-foreground active:bg-muted transition-colors
+                     cursor-pointer select-none
+                     focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background
+                     {isSlotVisible(page) ? '' : 'invisible pointer-events-none'}"
+              onclick={() => goToPage(page)}
+              aria-label="Go to page {page}"
+              aria-hidden={!isSlotVisible(page)}
+              tabindex={isSlotVisible(page) ? 0 : -1}
+              disabled={!isSlotVisible(page)}
+            use:slideIn={direction}
+          >
+              {page}
+            </button>
+          {/if}
+        {/each}
+      {/key}
+    </div>
+
+    <!-- Right zone: spacer for centering -->
+    <div class="flex-1"></div>
+  </div>
+{:else if totalCount > 0}
+  <!-- Single page: just show the count, no pagination controls -->
+  <div class="flex items-start text-xs -mt-3 pl-2">
+    <span class="text-muted-foreground">
+      Showing {formatNumber(start)}&ndash;{formatNumber(end)} of {formatNumber(totalCount)} courses
+    </span>
  </div>
 {/if}
@@ -1,52 +1,45 @@
 <script lang="ts">
 import type { Term, Subject } from "$lib/api";
+import SimpleTooltip from "./SimpleTooltip.svelte";
+import TermCombobox from "./TermCombobox.svelte";
+import SubjectCombobox from "./SubjectCombobox.svelte";

 let {
  terms,
  subjects,
  selectedTerm = $bindable(),
-  selectedSubject = $bindable(),
+  selectedSubjects = $bindable(),
  query = $bindable(),
  openOnly = $bindable(),
 }: {
  terms: Term[];
  subjects: Subject[];
  selectedTerm: string;
-  selectedSubject: string;
+  selectedSubjects: string[];
  query: string;
  openOnly: boolean;
 } = $props();
 </script>

-<div class="flex flex-wrap gap-3 items-center">
-  <select
-    bind:value={selectedTerm}
-    class="border border-border bg-card text-foreground rounded-md px-3 py-1.5 text-sm"
-  >
-    {#each terms as term (term.code)}
-      <option value={term.code}>{term.description}</option>
-    {/each}
-  </select>
+<div class="flex flex-wrap gap-3 items-start">
+  <TermCombobox {terms} bind:value={selectedTerm} />

-  <select
-    bind:value={selectedSubject}
-    class="border border-border bg-card text-foreground rounded-md px-3 py-1.5 text-sm"
-  >
-    <option value="">All Subjects</option>
-    {#each subjects as subject (subject.code)}
-      <option value={subject.code}>{subject.description}</option>
-    {/each}
-  </select>
+  <SubjectCombobox {subjects} bind:value={selectedSubjects} />

  <input
    type="text"
    placeholder="Search courses..."
+    aria-label="Search courses"
    bind:value={query}
-    class="border border-border bg-card text-foreground rounded-md px-3 py-1.5 text-sm flex-1 min-w-[200px]"
+    class="h-9 border border-border bg-card text-foreground rounded-md px-3 text-sm flex-1 min-w-[200px]
+           focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background
+           transition-colors"
  />

-  <label class="flex items-center gap-1.5 text-sm text-muted-foreground cursor-pointer">
-    <input type="checkbox" bind:checked={openOnly} />
-    Open only
-  </label>
+  <SimpleTooltip text="Show only courses with available seats" delay={200} passthrough>
+    <label class="flex items-center gap-1.5 h-9 text-sm text-muted-foreground cursor-pointer">
+      <input type="checkbox" bind:checked={openOnly} />
+      Open only
+    </label>
+  </SimpleTooltip>
 </div>
@@ -0,0 +1,68 @@
+<script lang="ts">
+import { onMount } from "svelte";
+import SimpleTooltip from "$lib/components/SimpleTooltip.svelte";
+import { relativeTime } from "$lib/time";
+import { formatNumber } from "$lib/utils";
+
+export interface SearchMeta {
+  totalCount: number;
+  durationMs: number;
+  timestamp: Date;
+}
+
+let { meta }: { meta: SearchMeta | null } = $props();
+
+let now = $state(new Date());
+
+let formattedTime = $derived(
+  meta
+    ? meta.timestamp.toLocaleTimeString(undefined, {
+        hour: "2-digit",
+        minute: "2-digit",
+        second: "2-digit",
+      })
+    : ""
+);
+
+let relativeTimeResult = $derived(meta ? relativeTime(meta.timestamp, now) : null);
+let relativeTimeText = $derived(relativeTimeResult?.text ?? "");
+
+let countLabel = $derived(meta ? formatNumber(meta.totalCount) : "");
+let resultNoun = $derived(meta ? (meta.totalCount !== 1 ? "results" : "result") : "");
+let durationLabel = $derived(meta ? `${Math.round(meta.durationMs)}ms` : "");
+
+let tooltipText = $derived(meta ? `${relativeTimeText} · ${formattedTime}` : "");
+
+onMount(() => {
+  let nowTimeoutId: ReturnType<typeof setTimeout> | null = null;
+
+  function scheduleNowTick() {
+    const delay = relativeTimeResult?.nextUpdateMs ?? 1000;
+    nowTimeoutId = setTimeout(() => {
+      now = new Date();
+      scheduleNowTick();
+    }, delay);
+  }
+  scheduleNowTick();
+
+  return () => {
+    if (nowTimeoutId) clearTimeout(nowTimeoutId);
+  };
+});
+</script>
+
+<SimpleTooltip
+    text={tooltipText}
+    contentClass="whitespace-nowrap text-[12px] px-2 py-1"
+    triggerClass="self-start"
+    sideOffset={0}
+>
+    <span
+        class="pl-1 text-xs transition-opacity duration-200"
+        style:opacity={meta ? 1 : 0}
+    >
+        <span class="text-muted-foreground/70">{countLabel}</span>
+        <span class="text-muted-foreground/35">{resultNoun} in</span>
+        <span class="text-muted-foreground/70">{durationLabel}</span>
+    </span>
+</SimpleTooltip>
@@ -0,0 +1,42 @@
+<script lang="ts">
+import { Tooltip } from "bits-ui";
+import type { Snippet } from "svelte";
+import { cn } from "$lib/utils";
+
+let {
+  text,
+  delay = 150,
+  side = "top",
+  passthrough = false,
+  triggerClass = "",
+  contentClass = "",
+  sideOffset = 6,
+  children,
+}: {
+  text: string;
+  delay?: number;
+  side?: "top" | "bottom" | "left" | "right";
+  passthrough?: boolean;
+  triggerClass?: string;
+  contentClass?: string;
+  sideOffset?: number;
+  children: Snippet;
+} = $props();
+</script>
+
+<Tooltip.Root delayDuration={delay} disableHoverableContent={passthrough}>
+  <Tooltip.Trigger>
+    {#snippet child({ props })}
+      <span class={triggerClass} {...props}>
+        {@render children()}
+      </span>
+    {/snippet}
+  </Tooltip.Trigger>
+  <Tooltip.Content
+    {side}
+    {sideOffset}
+    class={cn("z-50 bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-sm whitespace-pre-line max-w-max text-left", contentClass)}
+  >
+    {text}
+  </Tooltip.Content>
+</Tooltip.Root>
@@ -0,0 +1,162 @@
+<script lang="ts">
+import { Combobox } from "bits-ui";
+import { Check, ChevronsUpDown } from "@lucide/svelte";
+import { fly } from "svelte/transition";
+import type { Subject } from "$lib/api";
+import { formatNumber } from "$lib/utils";
+
+let {
+  subjects,
+  value = $bindable(),
+}: {
+  subjects: Subject[];
+  value: string[];
+} = $props();
+
+let open = $state(false);
+let searchValue = $state("");
+let containerEl = $state<HTMLDivElement>(null!);
+
+const filteredSubjects = $derived.by(() => {
+  const query = searchValue.toLowerCase().trim();
+  if (query === "") return subjects;
+
+  const exactCode: Subject[] = [];
+  const codeStartsWith: Subject[] = [];
+  const descriptionMatch: Subject[] = [];
+
+  for (const s of subjects) {
+    const codeLower = s.code.toLowerCase();
+    const descLower = s.description.toLowerCase();
+
+    if (codeLower === query) {
+      exactCode.push(s);
+    } else if (codeLower.startsWith(query)) {
+      codeStartsWith.push(s);
+    } else if (descLower.includes(query) || codeLower.includes(query)) {
+      descriptionMatch.push(s);
+    }
+  }
+
+  return [...exactCode, ...codeStartsWith, ...descriptionMatch];
+});
+
+const MAX_VISIBLE_CHIPS = 3;
+const visibleChips = $derived(value.slice(0, MAX_VISIBLE_CHIPS));
+const overflowCount = $derived(Math.max(0, value.length - MAX_VISIBLE_CHIPS));
+
+function removeSubject(code: string) {
+  value = value.filter((v) => v !== code);
+}
+
+// bits-ui sets the input text to the last selected item's label — clear it
+$effect(() => {
+  value;
+  const input = containerEl?.querySelector("input");
+  if (input) {
+    input.value = "";
+    searchValue = "";
+  }
+});
+</script>
+
+<Combobox.Root
+  type="multiple"
+  bind:value
+  bind:open
+  onOpenChange={(o: boolean) => {
+    if (!o) searchValue = "";
+  }}
+>
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    class="relative h-9 rounded-md border border-border bg-card
+           flex flex-nowrap items-center gap-1 w-56 pr-9 overflow-hidden cursor-pointer
+           has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-ring has-[:focus-visible]:ring-offset-2 has-[:focus-visible]:ring-offset-background"
+    bind:this={containerEl}
+    onclick={() => { containerEl?.querySelector('input')?.focus(); }}
+  >
+    {#if value.length > 0}
+      {#each (open ? value : visibleChips) as code (code)}
+        <span
+          role="button"
+          tabindex="-1"
+          onmousedown={(e) => { e.preventDefault(); e.stopPropagation(); }}
+          onclick={(e) => { e.stopPropagation(); removeSubject(code); }}
+          onkeydown={(e) => { if (e.key === "Enter" || e.key === " ") { e.stopPropagation(); removeSubject(code); } }}
+          class="inline-flex items-center rounded bg-muted px-1.5 py-0.5 text-xs font-mono shrink-0
+                 text-muted-foreground hover:outline hover:outline-1 hover:outline-ring
+                 cursor-pointer transition-[outline] duration-100 first:ml-2"
+        >
+          {code}
+        </span>
+      {/each}
+      {#if !open && overflowCount > 0}
+        <span class="text-xs text-muted-foreground shrink-0">+{formatNumber(overflowCount)}</span>
+      {/if}
+    {/if}
+    <Combobox.Input
+      
+      oninput={(e) => (searchValue = e.currentTarget.value)}
+      onfocus={() => { open = true; }}
+      class="h-full min-w-0 flex-1 bg-transparent text-muted-foreground text-sm
+             placeholder:text-muted-foreground outline-none border-none
+             {value.length > 0 ? 'pl-1' : 'pl-3'}"
+      placeholder={value.length > 0 ? "Filter..." : "All Subjects"}
+      aria-label="Search subjects"
+      autocomplete="off"
+      autocorrect="off"
+      spellcheck={false}
+    />
+    <span class="absolute end-2 top-1/2 -translate-y-1/2 text-muted-foreground pointer-events-none">
+      <ChevronsUpDown class="size-4" />
+    </span>
+  </div>
+  <Combobox.Portal>
+    <Combobox.Content
+      customAnchor={containerEl}
+      class="border border-border bg-card shadow-md
+             outline-hidden z-50
+             max-h-72 min-w-[var(--bits-combobox-anchor-width)] w-max max-w-96
+             select-none rounded-md p-1
+             data-[side=bottom]:translate-y-1 data-[side=top]:-translate-y-1"
+      sideOffset={4}
+      forceMount
+    >
+      {#snippet child({ wrapperProps, props, open: isOpen })}
+        {#if isOpen}
+          <div {...wrapperProps}>
+            <div {...props} transition:fly={{ duration: 150, y: -4 }}>
+              <Combobox.Viewport class="p-0.5">
+                {#each filteredSubjects as subject (subject.code)}
+                  <Combobox.Item
+                    class="rounded-sm outline-hidden flex h-8 w-full select-none items-center gap-2 px-2 text-sm whitespace-nowrap
+                           data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground"
+                    value={subject.code}
+                    label={subject.description}
+                  >
+                    {#snippet children({ selected })}
+                      <span class="inline-flex items-center justify-center rounded bg-muted px-1 py-0.5
+                                   text-xs font-mono text-muted-foreground w-10 shrink-0 text-center">
+                        {subject.code}
+                      </span>
+                      <span class="flex-1">{subject.description}</span>
+                      {#if selected}
+                        <Check class="ml-auto size-4 shrink-0" />
+                      {/if}
+                    {/snippet}
+                  </Combobox.Item>
+                {:else}
+                  <span class="block px-2 py-2 text-sm text-muted-foreground">
+                    No subjects found.
+                  </span>
+                {/each}
+              </Combobox.Viewport>
+            </div>
+          </div>
+        {/if}
+      {/snippet}
+    </Combobox.Content>
+  </Combobox.Portal>
+</Combobox.Root>
@@ -0,0 +1,139 @@
+<script lang="ts">
+import { Combobox } from "bits-ui";
+import { Check, ChevronsUpDown } from "@lucide/svelte";
+import { fly } from "svelte/transition";
+import type { Term } from "$lib/api";
+
+let {
+  terms,
+  value = $bindable(),
+}: {
+  terms: Term[];
+  value: string;
+} = $props();
+
+let open = $state(false);
+let searchValue = $state("");
+let containerEl = $state<HTMLDivElement>(null!);
+
+const currentTermCode = $derived(
+  terms.find((t) => !t.description.includes("(View Only)"))?.code ?? ""
+);
+
+const selectedLabel = $derived(
+  terms.find((t) => t.code === value)?.description ?? "Select term..."
+);
+
+const filteredTerms = $derived.by(() => {
+  const query = searchValue.toLowerCase();
+  const matched =
+    query === "" ? terms : terms.filter((t) => t.description.toLowerCase().includes(query));
+
+  const current = matched.find((t) => t.code === currentTermCode);
+  const rest = matched.filter((t) => t.code !== currentTermCode);
+  return current ? [current, ...rest] : rest;
+});
+
+// Manage DOM input text: clear when open for searching, restore label when closed
+$effect(() => {
+  const _open = open;
+  void value; // track selection changes
+  const _label = selectedLabel;
+  const input = containerEl?.querySelector("input");
+  if (!input) return;
+  if (_open) {
+    input.value = "";
+    searchValue = "";
+  } else {
+    input.value = _label;
+  }
+});
+</script>
+
+<Combobox.Root
+  type="single"
+  bind:value={() => value, (v) => { if (v) value = v; }}
+  bind:open
+  onOpenChange={(o: boolean) => {
+    if (!o) searchValue = "";
+  }}
+>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    class="relative h-9 rounded-md border border-border bg-card
+           flex items-center w-40 cursor-pointer
+           has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-ring has-[:focus-visible]:ring-offset-2 has-[:focus-visible]:ring-offset-background"
+    role="presentation"
+    bind:this={containerEl}
+    onclick={() => { containerEl?.querySelector('input')?.focus(); }}
+    onkeydown={() => { containerEl?.querySelector('input')?.focus(); }}
+  >
+    <Combobox.Input
+      oninput={(e) => (searchValue = e.currentTarget.value)}
+      onfocus={() => { open = true; }}
+      class="h-full w-full bg-transparent text-muted-foreground text-sm
+             placeholder:text-muted-foreground outline-none border-none
+             pl-3 pr-9 truncate"
+      placeholder="Select term..."
+      aria-label="Select term"
+      autocomplete="off"
+      autocorrect="off"
+      spellcheck={false}
+    />
+    <span class="absolute end-2 top-1/2 -translate-y-1/2 text-muted-foreground pointer-events-none">
+      <ChevronsUpDown class="size-4" />
+    </span>
+  </div>
+  <Combobox.Portal>
+    <Combobox.Content
+      customAnchor={containerEl}
+      class="border border-border bg-card shadow-md
+             outline-hidden z-50
+             max-h-72 min-w-[var(--bits-combobox-anchor-width)]
+             select-none rounded-md p-1
+             data-[side=bottom]:translate-y-1 data-[side=top]:-translate-y-1"
+      sideOffset={4}
+      forceMount
+    >
+      {#snippet child({ wrapperProps, props, open: isOpen })}
+        {#if isOpen}
+          <div {...wrapperProps}>
+            <div {...props} transition:fly={{ duration: 150, y: -4 }}>
+              <Combobox.Viewport class="p-0.5">
+                {#each filteredTerms as term, i (term.code)}
+                  {#if i === 1 && term.code !== currentTermCode && filteredTerms[0]?.code === currentTermCode}
+                    <div class="mx-2 my-1 h-px bg-border"></div>
+                  {/if}
+                  <Combobox.Item
+                    class="rounded-sm outline-hidden flex h-8 w-full select-none items-center px-2 text-sm
+                           data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground
+                           {term.code === value ? 'cursor-default' : 'cursor-pointer'}
+                           {term.code === currentTermCode ? 'font-medium text-foreground' : 'text-foreground'}"
+                    value={term.code}
+                    label={term.description}
+                  >
+                    {#snippet children({ selected })}
+                      <span class="flex-1 truncate">
+                        {term.description}
+                        {#if term.code === currentTermCode}
+                          <span class="ml-1.5 text-xs text-muted-foreground font-normal">current</span>
+                        {/if}
+                      </span>
+                      {#if selected}
+                        <Check class="ml-2 size-4 shrink-0" />
+                      {/if}
+                    {/snippet}
+                  </Combobox.Item>
+                {:else}
+                  <span class="block px-2 py-2 text-sm text-muted-foreground">
+                    No terms found.
+                  </span>
+                {/each}
+              </Combobox.Viewport>
+            </div>
+          </div>
+        {/if}
+      {/snippet}
+    </Combobox.Content>
+  </Combobox.Portal>
+</Combobox.Root>
@@ -2,6 +2,7 @@
 import { tick } from "svelte";
 import { Moon, Sun } from "@lucide/svelte";
 import { themeStore } from "$lib/stores/theme.svelte";
+import SimpleTooltip from "./SimpleTooltip.svelte";

 /**
 * Theme toggle with View Transitions API circular reveal animation.
@@ -42,25 +43,27 @@ async function handleToggle(event: MouseEvent) {
 }
 </script>

-<button
-  type="button"
-  onclick={(e) => handleToggle(e)}
-  aria-label={themeStore.isDark ? "Switch to light mode" : "Switch to dark mode"}
-  class="cursor-pointer border-none rounded-md flex items-center justify-center p-2 scale-125
-    text-muted-foreground hover:bg-muted bg-transparent transition-colors"
->
-  <div class="relative size-[18px]">
-    <Sun
-      size={18}
-      class="absolute inset-0 transition-all duration-300 {themeStore.isDark
-        ? 'rotate-90 scale-0 opacity-0'
-        : 'rotate-0 scale-100 opacity-100'}"
-    />
-    <Moon
-      size={18}
-      class="absolute inset-0 transition-all duration-300 {themeStore.isDark
-        ? 'rotate-0 scale-100 opacity-100'
-        : '-rotate-90 scale-0 opacity-0'}"
-    />
-  </div>
-</button>
+<SimpleTooltip text={themeStore.isDark ? "Switch to light mode" : "Switch to dark mode"} delay={200} side="bottom" passthrough>
+  <button
+    type="button"
+    onclick={(e) => handleToggle(e)}
+    aria-label={themeStore.isDark ? "Switch to light mode" : "Switch to dark mode"}
+    class="cursor-pointer border-none rounded-md flex items-center justify-center p-1.5
+      text-muted-foreground hover:text-foreground hover:bg-background/50 bg-transparent transition-colors"
+  >
+    <div class="relative size-[18px]">
+      <Sun
+        size={18}
+        class="absolute inset-0 transition-all duration-300 {themeStore.isDark
+          ? 'rotate-90 scale-0 opacity-0'
+          : 'rotate-0 scale-100 opacity-100'}"
+      />
+      <Moon
+        size={18}
+        class="absolute inset-0 transition-all duration-300 {themeStore.isDark
+          ? 'rotate-0 scale-100 opacity-100'
+          : '-rotate-90 scale-0 opacity-0'}"
+      />
+    </div>
+  </button>
+</SimpleTooltip>
@@ -0,0 +1,656 @@
+<script lang="ts">
+import { onMount } from "svelte";
+import { scaleTime, scaleLinear } from "d3-scale";
+
+import { SUBJECTS, type Subject } from "$lib/timeline/data";
+import type { TimeSlot, ChartContext } from "$lib/timeline/types";
+import {
+  PADDING,
+  DEFAULT_AXIS_RATIO,
+  CHART_HEIGHT_RATIO,
+  MIN_SPAN_MS,
+  MAX_SPAN_MS,
+  DEFAULT_SPAN_MS,
+  ZOOM_FACTOR,
+  ZOOM_KEY_FACTOR,
+  ZOOM_EASE,
+  ZOOM_SETTLE_THRESHOLD,
+  PAN_FRICTION,
+  PAN_STOP_THRESHOLD,
+  PAN_STOP_THRESHOLD_Y,
+  VELOCITY_SAMPLE_WINDOW,
+  VELOCITY_MIN_DT,
+  PAN_STEP_RATIO,
+  PAN_STEP_CTRL_RATIO,
+  PAN_EASE,
+  PAN_SETTLE_THRESHOLD_PX,
+  YRATIO_STEP,
+  YRATIO_MIN,
+  YRATIO_MAX,
+  YRATIO_SETTLE_THRESHOLD,
+  FOLLOW_EASE,
+  MIN_MAXY,
+  MAX_DT,
+  DEFAULT_DT,
+  TAP_MAX_DURATION_MS,
+  TAP_MAX_DISTANCE_PX,
+} from "$lib/timeline/constants";
+import { createTimelineStore } from "$lib/timeline/store.svelte";
+import {
+  createAnimMap,
+  syncAnimTargets,
+  stepAnimations,
+  pruneAnimMap,
+} from "$lib/timeline/animation";
+import {
+  getVisibleSlots,
+  findSlotByTime,
+  snapToSlot,
+  enabledTotalClasses,
+} from "$lib/timeline/viewport";
+import {
+  drawGrid,
+  drawHoverColumn,
+  drawStackedArea,
+  drawNowLine,
+  drawTimeAxis,
+  stackVisibleSlots,
+} from "$lib/timeline/renderer";
+import TimelineDrawer from "./TimelineDrawer.svelte";
+import TimelineTooltip from "./TimelineTooltip.svelte";
+
+// ── Reactive DOM state ──────────────────────────────────────────────
+let canvasEl: HTMLCanvasElement | undefined = $state();
+let containerEl: HTMLDivElement | undefined = $state();
+let width = $state(800);
+let height = $state(400);
+let dpr = $state(1);
+
+// ── View window ─────────────────────────────────────────────────────
+let viewCenter = $state(Date.now());
+let viewSpan = $state(DEFAULT_SPAN_MS);
+let viewYRatio = $state(DEFAULT_AXIS_RATIO);
+
+// ── Interaction state ───────────────────────────────────────────────
+let isDragging = $state(false);
+let dragStartX = $state(0);
+let dragStartY = $state(0);
+let dragStartCenter = $state(0);
+let dragStartYRatio = $state(0);
+let followEnabled = $state(true);
+let ctrlHeld = $state(false);
+
+// ── Animation state (intentionally non-reactive — updated in rAF) ──
+let panVelocity = 0;
+let panVelocityY = 0;
+let pointerSamples: { time: number; x: number; y: number }[] = [];
+
+// ── Multi-touch / pinch state ────────────────────────────────────────
+let activePointers = new Map<number, { x: number; y: number }>();
+let isPinching = false;
+let pinchStartDist = 0;
+let pinchStartSpan = 0;
+let pinchAnchorTime = 0;
+let pinchAnchorRatio = 0.5;
+
+// ── Tap detection ────────────────────────────────────────────────────
+let pointerDownTime = 0;
+let pointerDownPos = { x: 0, y: 0 };
+
+let targetSpan = DEFAULT_SPAN_MS;
+let zoomAnchorTime = 0;
+let zoomAnchorRatio = 0.5;
+let isZoomAnimating = false;
+
+let targetCenter = Date.now();
+let isPanAnimating = false;
+let targetYRatio = DEFAULT_AXIS_RATIO;
+let isYPanAnimating = false;
+
+let animationFrameId = 0;
+let lastFrameTime = 0;
+let animatedMaxY = MIN_MAXY;
+
+const animMap = createAnimMap();
+
+// ── Tooltip + hover ─────────────────────────────────────────────────
+let tooltipVisible = $state(false);
+let tooltipX = $state(0);
+let tooltipY = $state(0);
+let tooltipSlot: TimeSlot | null = $state(null);
+let hoverSlotTime: number | null = $state(null);
+let lastPointerClientX = 0;
+let lastPointerClientY = 0;
+let pointerOverCanvas = false;
+
+// ── Drawer ──────────────────────────────────────────────────────────
+let drawerOpen = $state(false);
+let enabledSubjects: Set<Subject> = $state(new Set(SUBJECTS));
+
+// ── Data store ──────────────────────────────────────────────────────
+const store = createTimelineStore();
+let data: TimeSlot[] = $derived(store.data);
+let activeSubjects = $derived(SUBJECTS.filter((s) => enabledSubjects.has(s)));
+
+// ── Derived layout ──────────────────────────────────────────────────
+let viewStart = $derived(viewCenter - viewSpan / 2);
+let viewEnd = $derived(viewCenter + viewSpan / 2);
+let chartHeight = $derived(height * CHART_HEIGHT_RATIO);
+let chartBottom = $derived(height * viewYRatio);
+let chartTop = $derived(chartBottom - chartHeight);
+
+let xScale = $derived(
+  scaleTime()
+    .domain([new Date(viewStart), new Date(viewEnd)])
+    .range([PADDING.left, width - PADDING.right])
+);
+
+// Reused across frames — domain/range updated imperatively in render().
+let yScale = scaleLinear()
+  .domain([0, MIN_MAXY * 1.1])
+  .range([0, 1]);
+
+// ── Subject toggling ────────────────────────────────────────────────
+function toggleSubject(subject: Subject) {
+  const next = new Set(enabledSubjects);
+  if (next.has(subject)) next.delete(subject);
+  else next.add(subject);
+  enabledSubjects = next;
+}
+
+function enableAll() {
+  enabledSubjects = new Set(SUBJECTS);
+}
+
+function disableAll() {
+  enabledSubjects = new Set();
+}
+
+// ── Rendering ───────────────────────────────────────────────────────
+function render() {
+  if (!canvasEl) return;
+  const ctx = canvasEl.getContext("2d");
+  if (!ctx) return;
+
+  // Update yScale in-place (no allocation per frame).
+  yScale.domain([0, animatedMaxY * 1.1]).range([chartBottom, chartTop]);
+
+  ctx.save();
+  ctx.scale(dpr, dpr);
+  ctx.clearRect(0, 0, width, height);
+
+  const chart: ChartContext = {
+    ctx,
+    xScale,
+    yScale,
+    width,
+    chartTop,
+    chartBottom,
+    viewSpan,
+    viewStart,
+    viewEnd,
+  };
+
+  const visible = getVisibleSlots(data, viewStart, viewEnd);
+  const visibleStack = stackVisibleSlots(visible, enabledSubjects, animMap);
+
+  drawGrid(chart);
+  drawHoverColumn(chart, visibleStack, hoverSlotTime);
+  drawStackedArea(chart, visibleStack);
+  drawNowLine(chart);
+  drawTimeAxis(chart);
+
+  ctx.restore();
+}
+
+// ── Hover logic ─────────────────────────────────────────────────────
+function updateHover() {
+  if (!pointerOverCanvas || isDragging || !canvasEl) return;
+
+  const rect = canvasEl.getBoundingClientRect();
+  const x = lastPointerClientX - rect.left;
+  const y = lastPointerClientY - rect.top;
+
+  if (y < chartTop || y > chartBottom) {
+    tooltipVisible = false;
+    hoverSlotTime = null;
+    return;
+  }
+
+  const time = xScale.invert(x);
+  const snappedTime = snapToSlot(time.getTime());
+  const slot = findSlotByTime(data, snappedTime);
+  if (!slot) {
+    tooltipVisible = false;
+    hoverSlotTime = null;
+    return;
+  }
+
+  const total = enabledTotalClasses(slot, activeSubjects);
+  if (total <= 0) {
+    tooltipVisible = false;
+    hoverSlotTime = null;
+    return;
+  }
+
+  // Bypass area overlap check when CTRL is held.
+  if (!ctrlHeld) {
+    const stackTopY = yScale(total);
+    if (y < stackTopY) {
+      tooltipVisible = false;
+      hoverSlotTime = null;
+      return;
+    }
+  }
+
+  tooltipSlot = slot;
+  tooltipX = lastPointerClientX;
+  tooltipY = lastPointerClientY;
+  tooltipVisible = true;
+  hoverSlotTime = snappedTime;
+}
+
+// ── Interaction helpers ───────────────────────────────────────────────
+function pinchDistance(): number {
+  const pts = [...activePointers.values()];
+  if (pts.length < 2) return 0;
+  const dx = pts[1].x - pts[0].x;
+  const dy = pts[1].y - pts[0].y;
+  return Math.hypot(dx, dy);
+}
+
+function pinchMidpoint(): { x: number; y: number } {
+  const pts = [...activePointers.values()];
+  if (pts.length < 2) return { x: 0, y: 0 };
+  return { x: (pts[0].x + pts[1].x) / 2, y: (pts[0].y + pts[1].y) / 2 };
+}
+
+// ── Interaction handlers ────────────────────────────────────────────
+function onPointerDown(e: PointerEvent) {
+  if (e.button !== 0) return;
+  (e.currentTarget as HTMLElement).setPointerCapture(e.pointerId);
+  activePointers.set(e.pointerId, { x: e.clientX, y: e.clientY });
+
+  // Two fingers down → start pinch-to-zoom
+  if (activePointers.size === 2) {
+    isDragging = false;
+    isPinching = true;
+    pinchStartDist = pinchDistance();
+    pinchStartSpan = viewSpan;
+
+    const mid = pinchMidpoint();
+    const rect = canvasEl?.getBoundingClientRect();
+    const midX = rect ? mid.x - rect.left : mid.x;
+    const chartWidth = width - PADDING.left - PADDING.right;
+
+    pinchAnchorTime = xScale.invert(midX).getTime();
+    pinchAnchorRatio = (midX - PADDING.left) / chartWidth;
+    return;
+  }
+
+  // Single finger / mouse → start drag
+  isDragging = true;
+  dragStartX = e.clientX;
+  dragStartY = e.clientY;
+  dragStartCenter = viewCenter;
+  dragStartYRatio = viewYRatio;
+  followEnabled = false;
+  panVelocity = 0;
+  panVelocityY = 0;
+  isZoomAnimating = false;
+  isPanAnimating = false;
+  isYPanAnimating = false;
+  targetSpan = viewSpan;
+  tooltipVisible = false;
+  hoverSlotTime = null;
+  pointerDownTime = performance.now();
+  pointerDownPos = { x: e.clientX, y: e.clientY };
+  pointerSamples = [{ time: performance.now(), x: e.clientX, y: e.clientY }];
+}
+
+function onPointerMove(e: PointerEvent) {
+  ctrlHeld = e.ctrlKey || e.metaKey;
+  lastPointerClientX = e.clientX;
+  lastPointerClientY = e.clientY;
+  pointerOverCanvas = true;
+  activePointers.set(e.pointerId, { x: e.clientX, y: e.clientY });
+
+  // Pinch-to-zoom (two-finger gesture)
+  if (isPinching && activePointers.size >= 2) {
+    const dist = pinchDistance();
+    if (pinchStartDist > 0) {
+      const scale = pinchStartDist / dist; // fingers apart = zoom in
+      const newSpan = Math.min(MAX_SPAN_MS, Math.max(MIN_SPAN_MS, pinchStartSpan * scale));
+      viewSpan = newSpan;
+      targetSpan = newSpan;
+      viewCenter = pinchAnchorTime + (0.5 - pinchAnchorRatio) * viewSpan;
+    }
+    return;
+  }
+
+  if (isDragging) {
+    const dx = e.clientX - dragStartX;
+    const dy = e.clientY - dragStartY;
+    const msPerPx = viewSpan / (width - PADDING.left - PADDING.right);
+    viewCenter = dragStartCenter - dx * msPerPx;
+    viewYRatio = dragStartYRatio + dy / height;
+
+    const now = performance.now();
+    pointerSamples.push({ time: now, x: e.clientX, y: e.clientY });
+    const cutoff = now - VELOCITY_SAMPLE_WINDOW;
+    pointerSamples = pointerSamples.filter((s) => s.time >= cutoff);
+  } else {
+    updateHover();
+  }
+}
+
+function onPointerUp(e: PointerEvent) {
+  (e.currentTarget as HTMLElement).releasePointerCapture(e.pointerId);
+  activePointers.delete(e.pointerId);
+
+  // End pinch when fewer than 2 fingers remain
+  if (isPinching) {
+    if (activePointers.size < 2) {
+      isPinching = false;
+      // If one finger remains, reset drag origin to that finger's position
+      if (activePointers.size === 1) {
+        const remaining = [...activePointers.values()][0];
+        isDragging = true;
+        dragStartX = remaining.x;
+        dragStartY = remaining.y;
+        dragStartCenter = viewCenter;
+        dragStartYRatio = viewYRatio;
+        pointerSamples = [{ time: performance.now(), x: remaining.x, y: remaining.y }];
+      }
+    }
+    return;
+  }
+
+  isDragging = false;
+
+  // Tap detection: short duration + minimal movement → show tooltip
+  const elapsed = performance.now() - pointerDownTime;
+  const dist = Math.hypot(e.clientX - pointerDownPos.x, e.clientY - pointerDownPos.y);
+  if (elapsed < TAP_MAX_DURATION_MS && dist < TAP_MAX_DISTANCE_PX) {
+    lastPointerClientX = e.clientX;
+    lastPointerClientY = e.clientY;
+    pointerOverCanvas = true;
+    // Bypass the isDragging guard in updateHover since we just cleared it
+    updateHover();
+    pointerSamples = [];
+    return;
+  }
+
+  // Momentum from drag
+  if (pointerSamples.length >= 2) {
+    const first = pointerSamples[0];
+    const last = pointerSamples[pointerSamples.length - 1];
+    const dt = last.time - first.time;
+    if (dt > VELOCITY_MIN_DT) {
+      const pxPerMsX = (last.x - first.x) / dt;
+      const msPerPx = viewSpan / (width - PADDING.left - PADDING.right);
+      panVelocity = -pxPerMsX * msPerPx;
+      panVelocityY = (last.y - first.y) / dt;
+    }
+  }
+  pointerSamples = [];
+}
+
+function onPointerLeave() {
+  pointerOverCanvas = false;
+  tooltipVisible = false;
+  hoverSlotTime = null;
+}
+
+function onPointerCancel(e: PointerEvent) {
+  activePointers.delete(e.pointerId);
+  if (activePointers.size < 2) isPinching = false;
+  if (activePointers.size === 0) isDragging = false;
+}
+
+function onWheel(e: WheelEvent) {
+  e.preventDefault();
+  if (!canvasEl) return;
+  followEnabled = false;
+  panVelocity = 0;
+  panVelocityY = 0;
+
+  const rect = canvasEl.getBoundingClientRect();
+  const mouseX = e.clientX - rect.left;
+  const chartWidth = width - PADDING.left - PADDING.right;
+
+  zoomAnchorTime = xScale.invert(mouseX).getTime();
+  zoomAnchorRatio = (mouseX - PADDING.left) / chartWidth;
+
+  const zoomIn = e.deltaY < 0;
+  const factor = zoomIn ? 1 / ZOOM_FACTOR : ZOOM_FACTOR;
+  targetSpan = Math.min(MAX_SPAN_MS, Math.max(MIN_SPAN_MS, targetSpan * factor));
+  isZoomAnimating = true;
+}
+
+function onKeyDown(e: KeyboardEvent) {
+  const wasCtrl = ctrlHeld;
+  ctrlHeld = e.ctrlKey || e.metaKey;
+  if (ctrlHeld !== wasCtrl) updateHover();
+
+  switch (e.key) {
+    case "ArrowLeft":
+    case "ArrowRight": {
+      e.preventDefault();
+      followEnabled = false;
+      panVelocity = 0;
+      const ratio = e.ctrlKey ? PAN_STEP_CTRL_RATIO : PAN_STEP_RATIO;
+      const step = viewSpan * ratio;
+      if (!isPanAnimating) targetCenter = viewCenter;
+      targetCenter += e.key === "ArrowRight" ? step : -step;
+      isPanAnimating = true;
+      break;
+    }
+    case "ArrowUp":
+    case "ArrowDown": {
+      e.preventDefault();
+      if (e.ctrlKey || e.metaKey) {
+        const direction = e.key === "ArrowUp" ? -1 : 1;
+        if (!isYPanAnimating) targetYRatio = viewYRatio;
+        targetYRatio = Math.max(
+          YRATIO_MIN,
+          Math.min(YRATIO_MAX, targetYRatio + direction * YRATIO_STEP)
+        );
+        isYPanAnimating = true;
+      } else {
+        const factor = e.key === "ArrowUp" ? 1 / ZOOM_KEY_FACTOR : ZOOM_KEY_FACTOR;
+        followEnabled = false;
+        panVelocity = 0;
+        zoomAnchorTime = isPanAnimating ? targetCenter : viewCenter;
+        zoomAnchorRatio = 0.5;
+        targetSpan = Math.min(MAX_SPAN_MS, Math.max(MIN_SPAN_MS, targetSpan * factor));
+        isZoomAnimating = true;
+      }
+      break;
+    }
+  }
+}
+
+function onKeyUp(e: KeyboardEvent) {
+  const wasCtrl = ctrlHeld;
+  ctrlHeld = e.ctrlKey || e.metaKey;
+  if (ctrlHeld !== wasCtrl) updateHover();
+}
+
+function onWindowBlur() {
+  const wasCtrl = ctrlHeld;
+  ctrlHeld = false;
+  if (wasCtrl) updateHover();
+}
+
+function resumeFollow() {
+  panVelocity = 0;
+  panVelocityY = 0;
+  isPanAnimating = false;
+  isYPanAnimating = false;
+  targetYRatio = DEFAULT_AXIS_RATIO;
+  viewYRatio = DEFAULT_AXIS_RATIO;
+  targetSpan = DEFAULT_SPAN_MS;
+  isZoomAnimating = true;
+  zoomAnchorTime = Date.now();
+  zoomAnchorRatio = 0.5;
+  followEnabled = true;
+}
+
+// ── Resize ──────────────────────────────────────────────────────────
+function updateSize() {
+  if (!containerEl) return;
+  const rect = containerEl.getBoundingClientRect();
+  width = rect.width;
+  height = rect.height;
+  dpr = window.devicePixelRatio || 1;
+  if (canvasEl) {
+    canvasEl.width = width * dpr;
+    canvasEl.height = height * dpr;
+  }
+}
+
+// ── Animation loop ──────────────────────────────────────────────────
+function tick(timestamp: number) {
+  const dt = lastFrameTime > 0 ? Math.min(timestamp - lastFrameTime, MAX_DT) : DEFAULT_DT;
+  lastFrameTime = timestamp;
+
+  const friction = Math.pow(PAN_FRICTION, dt / 16);
+
+  // Momentum panning
+  if (
+    !isDragging &&
+    (Math.abs(panVelocity) > PAN_STOP_THRESHOLD || Math.abs(panVelocityY) > PAN_STOP_THRESHOLD_Y)
+  ) {
+    viewCenter += panVelocity * dt;
+    viewYRatio += (panVelocityY * dt) / height;
+    panVelocity *= friction;
+    panVelocityY *= friction;
+    if (Math.abs(panVelocity) < PAN_STOP_THRESHOLD) panVelocity = 0;
+    if (Math.abs(panVelocityY) < PAN_STOP_THRESHOLD_Y) panVelocityY = 0;
+  }
+
+  // Smooth zoom
+  if (isZoomAnimating && !isDragging) {
+    const spanDiff = targetSpan - viewSpan;
+    if (Math.abs(spanDiff) < ZOOM_SETTLE_THRESHOLD) {
+      viewSpan = targetSpan;
+      viewCenter = zoomAnchorTime + (0.5 - zoomAnchorRatio) * viewSpan;
+      isZoomAnimating = false;
+    } else {
+      const zf = 1 - Math.pow(1 - ZOOM_EASE, dt / 16);
+      viewSpan += spanDiff * zf;
+      viewCenter = zoomAnchorTime + (0.5 - zoomAnchorRatio) * viewSpan;
+    }
+  }
+
+  // Keyboard pan
+  if (isPanAnimating && !isDragging) {
+    const panDiff = targetCenter - viewCenter;
+    const msPerPx = viewSpan / (width - PADDING.left - PADDING.right);
+    if (Math.abs(panDiff) < msPerPx * PAN_SETTLE_THRESHOLD_PX) {
+      viewCenter = targetCenter;
+      isPanAnimating = false;
+    } else {
+      viewCenter += panDiff * (1 - Math.pow(1 - PAN_EASE, dt / 16));
+    }
+  }
+
+  // Y-axis pan
+  if (isYPanAnimating && !isDragging) {
+    const yDiff = targetYRatio - viewYRatio;
+    if (Math.abs(yDiff) < YRATIO_SETTLE_THRESHOLD) {
+      viewYRatio = targetYRatio;
+      isYPanAnimating = false;
+    } else {
+      viewYRatio += yDiff * (1 - Math.pow(1 - PAN_EASE, dt / 16));
+    }
+  }
+
+  // Follow mode
+  if (followEnabled && !isDragging) {
+    const target = Date.now();
+    viewCenter += (target - viewCenter) * (1 - Math.pow(1 - FOLLOW_EASE, dt / 16));
+  }
+
+  // Step value animations & prune offscreen entries
+  const result = stepAnimations(animMap, dt, animatedMaxY);
+  animatedMaxY = result.maxY;
+  pruneAnimMap(animMap, viewStart, viewEnd, viewSpan);
+
+  render();
+  animationFrameId = requestAnimationFrame(tick);
+}
+
+// ── Animation sync ──────────────────────────────────────────────────
+$effect(() => {
+  const slots = data;
+  const enabled = enabledSubjects;
+  syncAnimTargets(animMap, slots, enabled);
+});
+
+// Request data whenever the visible window changes.
+$effect(() => {
+  store.requestRange(viewStart, viewEnd);
+});
+
+// ── Lifecycle ───────────────────────────────────────────────────────
+onMount(() => {
+  updateSize();
+
+  const ro = new ResizeObserver(updateSize);
+  if (containerEl) ro.observe(containerEl);
+
+  window.addEventListener("blur", onWindowBlur);
+
+  viewCenter = Date.now();
+  targetCenter = viewCenter;
+  targetSpan = viewSpan;
+  canvasEl?.focus();
+  animationFrameId = requestAnimationFrame(tick);
+
+  return () => {
+    cancelAnimationFrame(animationFrameId);
+    ro.disconnect();
+    window.removeEventListener("blur", onWindowBlur);
+    store.dispose();
+  };
+});
+</script>
+
+<div class="absolute inset-0 select-none" bind:this={containerEl}>
+  <canvas
+    bind:this={canvasEl}
+    class="w-full h-full cursor-grab outline-none"
+    class:cursor-grabbing={isDragging}
+    style="display: block; touch-action: none;"
+    tabindex="0"
+    aria-label="Interactive class schedule timeline chart"
+    onpointerdown={(e) => { canvasEl?.focus(); onPointerDown(e); }}
+    onpointermove={onPointerMove}
+    onpointerup={onPointerUp}
+    onpointerleave={onPointerLeave}
+    onpointercancel={onPointerCancel}
+    onwheel={onWheel}
+    onkeydown={onKeyDown}
+    onkeyup={onKeyUp}
+  ></canvas>
+
+  <TimelineDrawer
+    bind:open={drawerOpen}
+    {enabledSubjects}
+    {followEnabled}
+    onToggleSubject={toggleSubject}
+    onEnableAll={enableAll}
+    onDisableAll={disableAll}
+    onResumeFollow={resumeFollow}
+  />
+
+  <TimelineTooltip
+    visible={tooltipVisible}
+    x={tooltipX}
+    y={tooltipY}
+    slot={tooltipSlot}
+    {activeSubjects}
+  />
+</div>
@@ -0,0 +1,135 @@
+<script lang="ts">
+import { Filter, X } from "@lucide/svelte";
+import { SUBJECTS, SUBJECT_COLORS, type Subject } from "$lib/timeline/data";
+import { DRAWER_WIDTH } from "$lib/timeline/constants";
+
+interface Props {
+  open: boolean;
+  enabledSubjects: Set<Subject>;
+  followEnabled: boolean;
+  onToggleSubject: (subject: Subject) => void;
+  onEnableAll: () => void;
+  onDisableAll: () => void;
+  onResumeFollow: () => void;
+}
+
+let {
+  open = $bindable(),
+  enabledSubjects,
+  followEnabled,
+  onToggleSubject,
+  onEnableAll,
+  onDisableAll,
+  onResumeFollow,
+}: Props = $props();
+
+function onKeyDown(e: KeyboardEvent) {
+  if (e.key === "Escape" && open) {
+    open = false;
+  }
+}
+</script>
+
+<svelte:window onkeydown={onKeyDown} />
+
+<!-- Filter toggle button — slides out when drawer opens -->
+<button
+  class="absolute right-3 z-50 p-2 rounded-md
+    bg-black text-white dark:bg-white dark:text-black
+    hover:bg-neutral-800 dark:hover:bg-neutral-200
+    border border-black/20 dark:border-white/20
+    shadow-md transition-all duration-200 ease-in-out cursor-pointer
+    {open ? 'opacity-0 pointer-events-none' : 'opacity-100'}"
+  style="top: 20%; transform: translateX({open ? '60px' : '0'});"
+  onclick={() => (open = true)}
+  aria-label="Open filters"
+>
+  <Filter size={18} strokeWidth={2} />
+</button>
+
+<!-- Drawer panel -->
+<div
+  class="absolute right-0 z-40 rounded-l-lg shadow-xl transition-transform duration-200 ease-in-out {open ? '' : 'pointer-events-none'}"
+  style="top: 20%; width: {DRAWER_WIDTH}px; height: 60%; transform: translateX({open
+    ? 0
+    : DRAWER_WIDTH}px);"
+>
+  <div
+    class="h-full flex flex-col bg-background/90 backdrop-blur-md border border-border/40 rounded-l-lg overflow-hidden"
+    style="width: {DRAWER_WIDTH}px;"
+  >
+    <!-- Header -->
+    <div class="flex items-center justify-between px-3 py-2.5 border-b border-border/40">
+      <span class="text-xs font-semibold text-foreground">Filters</span>
+      <button
+        class="p-0.5 rounded text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
+        onclick={() => (open = false)}
+        aria-label="Close filters"
+      >
+        <X size={14} strokeWidth={2} />
+      </button>
+    </div>
+
+    <!-- Follow status -->
+    <div class="px-3 py-2 border-b border-border/40">
+      {#if followEnabled}
+        <div
+          class="px-2 py-1 rounded-md text-[10px] font-medium text-center
+            bg-green-500/10 text-green-600 dark:text-green-400 border border-green-500/20"
+        >
+          FOLLOWING
+        </div>
+      {:else}
+        <button
+          class="w-full px-2 py-1 rounded-md text-[10px] font-medium text-center
+            bg-muted/80 text-muted-foreground hover:text-foreground
+            border border-border/50 transition-colors cursor-pointer"
+          onclick={onResumeFollow}
+          aria-label="Resume following current time"
+        >
+          FOLLOW
+        </button>
+      {/if}
+    </div>
+
+    <!-- Subject toggles -->
+    <div class="flex-1 overflow-y-auto px-3 py-2">
+      <div class="flex items-center justify-between mb-2 text-[10px] text-muted-foreground">
+        <span class="uppercase tracking-wider font-medium">Subjects</span>
+        <div class="flex gap-1.5">
+          <button
+            class="hover:text-foreground transition-colors cursor-pointer"
+            onclick={onEnableAll}>All</button
+          >
+          <span class="opacity-40">|</span>
+          <button
+            class="hover:text-foreground transition-colors cursor-pointer"
+            onclick={onDisableAll}>None</button
+          >
+        </div>
+      </div>
+      <div class="space-y-0.5">
+        {#each SUBJECTS as subject}
+          {@const enabled = enabledSubjects.has(subject)}
+          <button
+            class="flex items-center gap-2 w-full px-1.5 py-1 rounded text-xs
+              hover:bg-muted/50 transition-colors cursor-pointer text-left"
+            onclick={() => onToggleSubject(subject)}
+          >
+            <span
+              class="inline-block w-3 h-3 rounded-sm shrink-0 transition-opacity"
+              style="background: {SUBJECT_COLORS[subject]}; opacity: {enabled ? 1 : 0.2};"
+            ></span>
+            <span
+              class="transition-opacity {enabled
+                ? 'text-foreground'
+                : 'text-muted-foreground/50'}"
+            >
+              {subject}
+            </span>
+          </button>
+        {/each}
+      </div>
+    </div>
+  </div>
+</div>
@@ -0,0 +1,52 @@
+<script lang="ts">
+import { timeFormat } from "d3-time-format";
+import { SUBJECT_COLORS, type Subject } from "$lib/timeline/data";
+import type { TimeSlot } from "$lib/timeline/types";
+import { enabledTotalClasses } from "$lib/timeline/viewport";
+
+interface Props {
+  visible: boolean;
+  x: number;
+  y: number;
+  slot: TimeSlot | null;
+  activeSubjects: readonly Subject[];
+}
+
+let { visible, x, y, slot, activeSubjects }: Props = $props();
+
+const fmtTime = timeFormat("%-I:%M %p");
+</script>
+
+{#if visible && slot}
+  {@const total = enabledTotalClasses(slot, activeSubjects)}
+  <div
+    class="pointer-events-none fixed z-50 rounded-lg border border-border/60 bg-background/95
+      backdrop-blur-sm shadow-lg px-3 py-2 text-xs min-w-[140px]"
+    style="left: {x + 12}px; top: {y - 10}px; transform: translateY(-100%);"
+  >
+    <div class="font-semibold text-foreground mb-1.5">
+      {fmtTime(slot.time)}
+    </div>
+    <div class="space-y-0.5">
+      {#each activeSubjects as subject}
+        {@const count = slot.subjects[subject] || 0}
+        {#if count > 0}
+          <div class="flex items-center justify-between gap-3">
+            <div class="flex items-center gap-1.5">
+              <span
+                class="inline-block w-2 h-2 rounded-sm"
+                style="background: {SUBJECT_COLORS[subject]}"
+              ></span>
+              <span class="text-muted-foreground">{subject}</span>
+            </div>
+            <span class="font-medium tabular-nums">{count}</span>
+          </div>
+        {/if}
+      {/each}
+    </div>
+    <div class="mt-1.5 pt-1.5 border-t border-border/40 flex justify-between font-medium">
+      <span>Total</span>
+      <span class="tabular-nums">{total}</span>
+    </div>
+  </div>
+{/if}
@@ -39,7 +39,7 @@ export function createSvelteTable<TData extends RowData>(options: TableOptions<T
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        onStateChange: (updater: any) => {
          if (updater instanceof Function) state = updater(state);
-          else state = mergeObjects(state, updater as Partial<TableState>);
+          else state = { ...state, ...(updater as Partial<TableState>) };

          options.onStateChange?.(updater);
        },
@@ -0,0 +1,32 @@
+/**
+ * Reactive clipboard copy with automatic "copied" state reset.
+ *
+ * Returns a `copiedValue` that is non-null while the copied feedback
+ * should be displayed, and a `copy()` function to trigger a copy.
+ */
+export function useClipboard(resetMs = 2000) {
+  let copiedValue = $state<string | null>(null);
+  let timeoutId: number | undefined;
+
+  async function copy(text: string, event?: MouseEvent | KeyboardEvent) {
+    event?.stopPropagation();
+    try {
+      await navigator.clipboard.writeText(text);
+      clearTimeout(timeoutId);
+      copiedValue = text;
+      timeoutId = window.setTimeout(() => {
+        copiedValue = null;
+        timeoutId = undefined;
+      }, resetMs);
+    } catch (err) {
+      console.error("Failed to copy to clipboard:", err);
+    }
+  }
+
+  return {
+    get copiedValue() {
+      return copiedValue;
+    },
+    copy,
+  };
+}
@@ -0,0 +1,37 @@
+import { onMount } from "svelte";
+import { OverlayScrollbars, type PartialOptions } from "overlayscrollbars";
+import { themeStore } from "$lib/stores/theme.svelte";
+
+/**
+ * Set up OverlayScrollbars on an element with automatic theme reactivity.
+ *
+ * Must be called during component initialization (uses `onMount` internally).
+ * The scrollbar theme automatically syncs with `themeStore.isDark`.
+ */
+export function useOverlayScrollbars(getElement: () => HTMLElement, options: PartialOptions = {}) {
+  onMount(() => {
+    const element = getElement();
+    const osInstance = OverlayScrollbars(element, {
+      ...options,
+      scrollbars: {
+        ...options.scrollbars,
+        theme: themeStore.isDark ? "os-theme-dark" : "os-theme-light",
+      },
+    });
+
+    const unwatch = $effect.root(() => {
+      $effect(() => {
+        osInstance.options({
+          scrollbars: {
+            theme: themeStore.isDark ? "os-theme-dark" : "os-theme-light",
+          },
+        });
+      });
+    });
+
+    return () => {
+      unwatch();
+      osInstance.destroy();
+    };
+  });
+}
@@ -1,14 +1,19 @@
 import { describe, it, expect } from "vitest";
 import {
  formatTime,
+  formatTimeRange,
  formatMeetingDays,
+  formatMeetingDaysVerbose,
  formatMeetingTime,
+  formatMeetingTimeTooltip,
+  formatMeetingTimesTooltip,
  abbreviateInstructor,
  formatCreditHours,
  getPrimaryInstructor,
  isMeetingTimeTBA,
  isTimeTBA,
  formatDate,
+  formatDateShort,
  formatMeetingDaysLong,
 } from "$lib/course";
 import type { DbMeetingTime, CourseResponse, InstructorResponse } from "$lib/api";
@@ -53,13 +58,13 @@ describe("formatMeetingDays", () => {
      formatMeetingDays(makeMeetingTime({ monday: true, wednesday: true, friday: true }))
    ).toBe("MWF");
  });
-  it("returns TR for tue/thu", () => {
-    expect(formatMeetingDays(makeMeetingTime({ tuesday: true, thursday: true }))).toBe("TR");
+  it("returns TTh for tue/thu", () => {
+    expect(formatMeetingDays(makeMeetingTime({ tuesday: true, thursday: true }))).toBe("TTh");
  });
-  it("returns empty string when no days", () => {
-    expect(formatMeetingDays(makeMeetingTime())).toBe("");
+  it("returns MW for mon/wed", () => {
+    expect(formatMeetingDays(makeMeetingTime({ monday: true, wednesday: true }))).toBe("MW");
  });
-  it("returns all days", () => {
+  it("returns MTWThF for all weekdays", () => {
    expect(
      formatMeetingDays(
        makeMeetingTime({
@@ -68,16 +73,56 @@ describe("formatMeetingDays", () => {
          wednesday: true,
          thursday: true,
          friday: true,
-          saturday: true,
-          sunday: true,
        })
      )
-    ).toBe("MTWRFSU");
+    ).toBe("MTWThF");
+  });
+  it("returns partial abbreviation for single day", () => {
+    expect(formatMeetingDays(makeMeetingTime({ monday: true }))).toBe("Mon");
+    expect(formatMeetingDays(makeMeetingTime({ thursday: true }))).toBe("Thu");
+    expect(formatMeetingDays(makeMeetingTime({ saturday: true }))).toBe("Sat");
+  });
+  it("concatenates codes for other multi-day combos", () => {
+    expect(formatMeetingDays(makeMeetingTime({ monday: true, friday: true }))).toBe("MF");
+    expect(formatMeetingDays(makeMeetingTime({ tuesday: true, saturday: true }))).toBe("TSa");
+    expect(
+      formatMeetingDays(makeMeetingTime({ wednesday: true, friday: true, sunday: true }))
+    ).toBe("WFSu");
+    expect(
+      formatMeetingDays(
+        makeMeetingTime({ monday: true, tuesday: true, wednesday: true, thursday: true })
+      )
+    ).toBe("MTWTh");
+  });
+  it("returns empty string when no days", () => {
+    expect(formatMeetingDays(makeMeetingTime())).toBe("");
+  });
+});
+
+describe("formatTimeRange", () => {
+  it("elides AM when both times are AM", () => {
+    expect(formatTimeRange("0900", "0950")).toBe("9:00–9:50 AM");
+  });
+  it("elides PM when both times are PM", () => {
+    expect(formatTimeRange("1315", "1430")).toBe("1:15–2:30 PM");
+  });
+  it("keeps both markers when crossing noon", () => {
+    expect(formatTimeRange("1130", "1220")).toBe("11:30 AM–12:20 PM");
+  });
+  it("returns TBA for null begin", () => {
+    expect(formatTimeRange(null, "0950")).toBe("TBA");
+  });
+  it("returns TBA for null end", () => {
+    expect(formatTimeRange("0900", null)).toBe("TBA");
+  });
+  it("handles midnight and noon", () => {
+    expect(formatTimeRange("0000", "0050")).toBe("12:00–12:50 AM");
+    expect(formatTimeRange("1200", "1250")).toBe("12:00–12:50 PM");
  });
 });

 describe("formatMeetingTime", () => {
-  it("formats a standard meeting time", () => {
+  it("formats a standard meeting time with elided AM/PM", () => {
    expect(
      formatMeetingTime(
        makeMeetingTime({
@@ -88,7 +133,19 @@ describe("formatMeetingTime", () => {
          end_time: "0950",
        })
      )
-    ).toBe("MWF 9:00 AM–9:50 AM");
+    ).toBe("MWF 9:00–9:50 AM");
+  });
+  it("keeps both markers when crossing noon", () => {
+    expect(
+      formatMeetingTime(
+        makeMeetingTime({
+          tuesday: true,
+          thursday: true,
+          begin_time: "1130",
+          end_time: "1220",
+        })
+      )
+    ).toBe("TTh 11:30 AM–12:20 PM");
  });
  it("returns TBA when no days", () => {
    expect(formatMeetingTime(makeMeetingTime({ begin_time: "0900", end_time: "0950" }))).toBe(
@@ -96,29 +153,74 @@ describe("formatMeetingTime", () => {
    );
  });
  it("returns days + TBA when no times", () => {
-    expect(formatMeetingTime(makeMeetingTime({ monday: true }))).toBe("M TBA");
+    expect(formatMeetingTime(makeMeetingTime({ monday: true }))).toBe("Mon TBA");
  });
 });

 describe("abbreviateInstructor", () => {
-  it("abbreviates standard name", () =>
-    expect(abbreviateInstructor("Heaps, John")).toBe("Heaps, J."));
+  it("returns short names unabbreviated", () =>
+    expect(abbreviateInstructor("Li, Bo")).toBe("Li, Bo"));
+  it("returns names within budget unabbreviated", () =>
+    expect(abbreviateInstructor("Heaps, John")).toBe("Heaps, John"));
  it("handles no comma", () => expect(abbreviateInstructor("Staff")).toBe("Staff"));
-  it("handles multiple first names", () =>
-    expect(abbreviateInstructor("Smith, Mary Jane")).toBe("Smith, M."));
+
+  // Progressive abbreviation with multiple given names
+  it("abbreviates trailing given names first", () =>
+    expect(abbreviateInstructor("Ramirez, Maria Elena")).toBe("Ramirez, Maria E."));
+  it("abbreviates all given names when needed", () =>
+    expect(abbreviateInstructor("Ramirez, Maria Elena", 16)).toBe("Ramirez, M. E."));
+  it("falls back to first initial only", () =>
+    expect(abbreviateInstructor("Ramirez, Maria Elena", 12)).toBe("Ramirez, M."));
+
+  // Single given name that exceeds budget
+  it("abbreviates single given name when over budget", () =>
+    expect(abbreviateInstructor("Bartholomew, Christopher", 18)).toBe("Bartholomew, C."));
+
+  // Respects custom maxLen
+  it("keeps full name when within custom budget", () =>
+    expect(abbreviateInstructor("Ramirez, Maria Elena", 30)).toBe("Ramirez, Maria Elena"));
+  it("always abbreviates when budget is tiny", () =>
+    expect(abbreviateInstructor("Heaps, John", 5)).toBe("Heaps, J."));
 });

 describe("getPrimaryInstructor", () => {
  it("returns primary instructor", () => {
    const instructors: InstructorResponse[] = [
-      { bannerId: "1", displayName: "A", email: null, isPrimary: false },
-      { bannerId: "2", displayName: "B", email: null, isPrimary: true },
+      {
+        instructorId: 1,
+        bannerId: "1",
+        displayName: "A",
+        email: "a@utsa.edu",
+        isPrimary: false,
+        rmpRating: null,
+        rmpNumRatings: null,
+        rmpLegacyId: null,
+      },
+      {
+        instructorId: 2,
+        bannerId: "2",
+        displayName: "B",
+        email: "b@utsa.edu",
+        isPrimary: true,
+        rmpRating: null,
+        rmpNumRatings: null,
+        rmpLegacyId: null,
+      },
    ];
    expect(getPrimaryInstructor(instructors)?.displayName).toBe("B");
  });
  it("returns first instructor when no primary", () => {
    const instructors: InstructorResponse[] = [
-      { bannerId: "1", displayName: "A", email: null, isPrimary: false },
+      {
+        instructorId: 3,
+        bannerId: "1",
+        displayName: "A",
+        email: "a@utsa.edu",
+        isPrimary: false,
+        rmpRating: null,
+        rmpNumRatings: null,
+        rmpLegacyId: null,
+      },
    ];
    expect(getPrimaryInstructor(instructors)?.displayName).toBe("A");
  });
@@ -226,3 +328,86 @@ describe("formatMeetingDaysLong", () => {
    expect(formatMeetingDaysLong(makeMeetingTime())).toBe("");
  });
 });
+
+describe("formatDateShort", () => {
+  it("formats YYYY-MM-DD to short", () => {
+    expect(formatDateShort("2024-08-26")).toBe("Aug 26, 2024");
+  });
+  it("formats MM/DD/YYYY to short", () => {
+    expect(formatDateShort("12/12/2024")).toBe("Dec 12, 2024");
+  });
+  it("returns original for invalid", () => {
+    expect(formatDateShort("bad")).toBe("bad");
+  });
+});
+
+describe("formatMeetingDaysVerbose", () => {
+  it("returns plural for single day", () => {
+    expect(formatMeetingDaysVerbose(makeMeetingTime({ thursday: true }))).toBe("Thursdays");
+  });
+  it("joins two days with ampersand", () => {
+    expect(formatMeetingDaysVerbose(makeMeetingTime({ tuesday: true, thursday: true }))).toBe(
+      "Tuesdays & Thursdays"
+    );
+  });
+  it("uses Oxford-style ampersand for 3+ days", () => {
+    expect(
+      formatMeetingDaysVerbose(makeMeetingTime({ monday: true, wednesday: true, friday: true }))
+    ).toBe("Mondays, Wednesdays & Fridays");
+  });
+  it("returns empty string when no days", () => {
+    expect(formatMeetingDaysVerbose(makeMeetingTime())).toBe("");
+  });
+});
+
+describe("formatMeetingTimeTooltip", () => {
+  it("formats full tooltip with location and dates", () => {
+    const mt = makeMeetingTime({
+      tuesday: true,
+      thursday: true,
+      begin_time: "1615",
+      end_time: "1730",
+      building_description: "Main Hall",
+      room: "2.206",
+    });
+    expect(formatMeetingTimeTooltip(mt)).toBe(
+      "Tuesdays & Thursdays, 4:15–5:30 PM\nMain Hall 2.206, Aug 26, 2024 – Dec 12, 2024"
+    );
+  });
+  it("handles TBA days and times", () => {
+    expect(formatMeetingTimeTooltip(makeMeetingTime())).toBe("TBA\nAug 26, 2024 – Dec 12, 2024");
+  });
+  it("handles days with TBA times", () => {
+    expect(formatMeetingTimeTooltip(makeMeetingTime({ monday: true }))).toBe(
+      "Mondays, TBA\nAug 26, 2024 – Dec 12, 2024"
+    );
+  });
+});
+
+describe("formatMeetingTimesTooltip", () => {
+  it("returns TBA for empty array", () => {
+    expect(formatMeetingTimesTooltip([])).toBe("TBA");
+  });
+  it("joins multiple meetings with blank line", () => {
+    const mts = [
+      makeMeetingTime({
+        monday: true,
+        wednesday: true,
+        friday: true,
+        begin_time: "0900",
+        end_time: "0950",
+      }),
+      makeMeetingTime({
+        thursday: true,
+        begin_time: "1300",
+        end_time: "1400",
+        building_description: "Lab",
+        room: "101",
+      }),
+    ];
+    const result = formatMeetingTimesTooltip(mts);
+    expect(result).toContain("Mondays, Wednesdays & Fridays, 9:00–9:50 AM");
+    expect(result).toContain("Thursdays, 1:00–2:00 PM\nLab 101");
+    expect(result).toContain("\n\n");
+  });
+});
@@ -10,21 +10,29 @@ export function formatTime(time: string | null): string {
  return `${display}:${minutes} ${period}`;
 }

-/** Get day abbreviation string like "MWF" from a meeting time */
+/**
+ * Compact day abbreviation for table cells.
+ *
+ * Single day → 3-letter: "Mon", "Thu"
+ * Multi-day  → concatenated codes: "MWF", "TTh", "MTWTh", "TSa"
+ *
+ * Codes use single letters where unambiguous (M/T/W/F) and
+ * two letters where needed (Th/Sa/Su).
+ */
 export function formatMeetingDays(mt: DbMeetingTime): string {
-  const days: [boolean, string][] = [
-    [mt.monday, "M"],
-    [mt.tuesday, "T"],
-    [mt.wednesday, "W"],
-    [mt.thursday, "R"],
-    [mt.friday, "F"],
-    [mt.saturday, "S"],
-    [mt.sunday, "U"],
+  const dayDefs: [boolean, string, string][] = [
+    [mt.monday, "M", "Mon"],
+    [mt.tuesday, "T", "Tue"],
+    [mt.wednesday, "W", "Wed"],
+    [mt.thursday, "Th", "Thu"],
+    [mt.friday, "F", "Fri"],
+    [mt.saturday, "Sa", "Sat"],
+    [mt.sunday, "Su", "Sun"],
  ];
-  return days
-    .filter(([active]) => active)
-    .map(([, abbr]) => abbr)
-    .join("");
+  const active = dayDefs.filter(([a]) => a);
+  if (active.length === 0) return "";
+  if (active.length === 1) return active[0][2];
+  return active.map(([, code]) => code).join("");
 }

 /** Longer day names for detail view: single day → "Thursdays", multiple → "Mon, Wed, Fri" */
@@ -44,23 +52,79 @@ export function formatMeetingDaysLong(mt: DbMeetingTime): string {
  return active.map(([, short]) => short).join(", ");
 }

-/** Condensed meeting time: "MWF 9:00 AM–9:50 AM" */
+/**
+ * Format a time range with smart AM/PM elision.
+ *
+ * Same period:  "9:00–9:50 AM"
+ * Cross-period: "11:30 AM–12:20 PM"
+ * Missing:      "TBA"
+ */
+export function formatTimeRange(begin: string | null, end: string | null): string {
+  if (!begin || begin.length !== 4 || !end || end.length !== 4) return "TBA";
+
+  const bHours = parseInt(begin.slice(0, 2), 10);
+  const eHours = parseInt(end.slice(0, 2), 10);
+  const bPeriod = bHours >= 12 ? "PM" : "AM";
+  const ePeriod = eHours >= 12 ? "PM" : "AM";
+
+  const bDisplay = bHours > 12 ? bHours - 12 : bHours === 0 ? 12 : bHours;
+  const eDisplay = eHours > 12 ? eHours - 12 : eHours === 0 ? 12 : eHours;
+
+  const endStr = `${eDisplay}:${end.slice(2)} ${ePeriod}`;
+  if (bPeriod === ePeriod) {
+    return `${bDisplay}:${begin.slice(2)}–${endStr}`;
+  }
+  return `${bDisplay}:${begin.slice(2)} ${bPeriod}–${endStr}`;
+}
+
+/** Condensed meeting time: "MWF 9:00–9:50 AM" */
 export function formatMeetingTime(mt: DbMeetingTime): string {
  const days = formatMeetingDays(mt);
  if (!days) return "TBA";
-  const begin = formatTime(mt.begin_time);
-  const end = formatTime(mt.end_time);
-  if (begin === "TBA") return `${days} TBA`;
-  return `${days} ${begin}–${end}`;
+  const range = formatTimeRange(mt.begin_time, mt.end_time);
+  if (range === "TBA") return `${days} TBA`;
+  return `${days} ${range}`;
 }

-/** Abbreviate instructor name: "Heaps, John" → "Heaps, J." */
-export function abbreviateInstructor(name: string): string {
+/**
+ * Progressively abbreviate an instructor name to fit within a character budget.
+ *
+ * Tries each level until the result fits `maxLen`:
+ *   1. Full name: "Ramirez, Maria Elena"
+ *   2. Abbreviate trailing given names: "Ramirez, Maria E."
+ *   3. Abbreviate all given names: "Ramirez, M. E."
+ *   4. First initial only: "Ramirez, M."
+ *
+ * Names without a comma (e.g. "Staff") are returned as-is.
+ */
+export function abbreviateInstructor(name: string, maxLen: number = 18): string {
+  if (name.length <= maxLen) return name;
+
  const commaIdx = name.indexOf(", ");
  if (commaIdx === -1) return name;
+
  const last = name.slice(0, commaIdx);
-  const first = name.slice(commaIdx + 2);
-  return `${last}, ${first.charAt(0)}.`;
+  const parts = name.slice(commaIdx + 2).split(" ");
+
+  // Level 2: abbreviate trailing given names, keep first given name intact
+  // "Maria Elena" → "Maria E."
+  if (parts.length > 1) {
+    const abbreviated = [parts[0], ...parts.slice(1).map((p) => `${p[0]}.`)].join(" ");
+    const result = `${last}, ${abbreviated}`;
+    if (result.length <= maxLen) return result;
+  }
+
+  // Level 3: abbreviate all given names
+  // "Maria Elena" → "M. E."
+  if (parts.length > 1) {
+    const allInitials = parts.map((p) => `${p[0]}.`).join(" ");
+    const result = `${last}, ${allInitials}`;
+    if (result.length <= maxLen) return result;
+  }
+
+  // Level 4: first initial only
+  // "Maria Elena" → "M."  or  "John" → "J."
+  return `${last}, ${parts[0][0]}.`;
 }

 /** Get primary instructor from a course, or first instructor */
@@ -119,6 +183,230 @@ export function formatLocationLong(mt: DbMeetingTime): string | null {
  return mt.room ? `${name} ${mt.room}` : name;
 }

+/** Format a date as "Aug 26, 2024". Accepts YYYY-MM-DD or MM/DD/YYYY. */
+export function formatDateShort(dateStr: string): string {
+  let year: number, month: number, day: number;
+  if (dateStr.includes("-")) {
+    [year, month, day] = dateStr.split("-").map(Number);
+  } else if (dateStr.includes("/")) {
+    [month, day, year] = dateStr.split("/").map(Number);
+  } else {
+    return dateStr;
+  }
+  if (!year || !month || !day) return dateStr;
+  const date = new Date(year, month - 1, day);
+  return date.toLocaleDateString("en-US", { year: "numeric", month: "short", day: "numeric" });
+}
+
+/**
+ * Verbose day names for tooltips: "Tuesdays & Thursdays", "Mondays, Wednesdays & Fridays".
+ * Single day → plural: "Thursdays".
+ */
+export function formatMeetingDaysVerbose(mt: DbMeetingTime): string {
+  const dayDefs: [boolean, string][] = [
+    [mt.monday, "Mondays"],
+    [mt.tuesday, "Tuesdays"],
+    [mt.wednesday, "Wednesdays"],
+    [mt.thursday, "Thursdays"],
+    [mt.friday, "Fridays"],
+    [mt.saturday, "Saturdays"],
+    [mt.sunday, "Sundays"],
+  ];
+  const active = dayDefs.filter(([a]) => a).map(([, name]) => name);
+  if (active.length === 0) return "";
+  if (active.length === 1) return active[0];
+  return active.slice(0, -1).join(", ") + " & " + active[active.length - 1];
+}
+
+/**
+ * Full verbose tooltip for a single meeting time:
+ * "Tuesdays & Thursdays, 4:15–5:30 PM\nMain Hall 2.206 · Aug 26 – Dec 12, 2024"
+ */
+export function formatMeetingTimeTooltip(mt: DbMeetingTime): string {
+  const days = formatMeetingDaysVerbose(mt);
+  const range = formatTimeRange(mt.begin_time, mt.end_time);
+  let line1: string;
+  if (!days && range === "TBA") {
+    line1 = "TBA";
+  } else if (!days) {
+    line1 = range;
+  } else if (range === "TBA") {
+    line1 = `${days}, TBA`;
+  } else {
+    line1 = `${days}, ${range}`;
+  }
+
+  const parts = [line1];
+
+  const loc = formatLocationLong(mt);
+  const dateRange =
+    mt.start_date && mt.end_date
+      ? `${formatDateShort(mt.start_date)} – ${formatDateShort(mt.end_date)}`
+      : null;
+
+  if (loc && dateRange) {
+    parts.push(`${loc}, ${dateRange}`);
+  } else if (loc) {
+    parts.push(loc);
+  } else if (dateRange) {
+    parts.push(dateRange);
+  }
+
+  return parts.join("\n");
+}
+
+/** Full verbose tooltip for all meeting times on a course, newline-separated. */
+export function formatMeetingTimesTooltip(meetingTimes: DbMeetingTime[]): string {
+  if (meetingTimes.length === 0) return "TBA";
+  return meetingTimes.map(formatMeetingTimeTooltip).join("\n\n");
+}
+
+/**
+ * Delivery concern category for visual accent on location cells.
+ * - "online": fully online with no physical location (OA, OS, OH without INT building)
+ * - "internet": internet campus with INT building code
+ * - "hybrid": mix of online and in-person (HB, H1, H2)
+ * - "off-campus": in-person but not on Main Campus
+ * - null: normal in-person on main campus (no accent)
+ */
+export type DeliveryConcern = "online" | "internet" | "hybrid" | "off-campus" | null;
+
+const ONLINE_METHODS = new Set(["OA", "OS", "OH"]);
+const HYBRID_METHODS = new Set(["HB", "H1", "H2"]);
+const MAIN_CAMPUS = "11";
+const ONLINE_CAMPUSES = new Set(["9", "ONL"]);
+
+export function getDeliveryConcern(course: CourseResponse): DeliveryConcern {
+  const method = course.instructionalMethod;
+  if (method && ONLINE_METHODS.has(method)) {
+    const hasIntBuilding = course.meetingTimes.some((mt: DbMeetingTime) => mt.building === "INT");
+    return hasIntBuilding ? "internet" : "online";
+  }
+  if (method && HYBRID_METHODS.has(method)) return "hybrid";
+  if (course.campus && course.campus !== MAIN_CAMPUS && !ONLINE_CAMPUSES.has(course.campus)) {
+    return "off-campus";
+  }
+  return null;
+}
+
+/** Border accent color for each delivery concern type. */
+export function concernAccentColor(concern: DeliveryConcern): string | null {
+  switch (concern) {
+    case "online":
+      return "#3b82f6"; // blue-500
+    case "internet":
+      return "#06b6d4"; // cyan-500
+    case "hybrid":
+      return "#a855f7"; // purple-500
+    case "off-campus":
+      return "#f59e0b"; // amber-500
+    default:
+      return null;
+  }
+}
+
+/**
+ * Location display text for the table cell.
+ * Falls back to "Online" for online courses instead of showing a dash.
+ */
+export function formatLocationDisplay(course: CourseResponse): string | null {
+  const loc = formatLocation(course);
+  if (loc) return loc;
+  const concern = getDeliveryConcern(course);
+  if (concern === "online") return "Online";
+  return null;
+}
+
+/** Tooltip text for the location column: long-form location + delivery note */
+export function formatLocationTooltip(course: CourseResponse): string | null {
+  const parts: string[] = [];
+
+  for (const mt of course.meetingTimes) {
+    const loc = formatLocationLong(mt);
+    if (loc && !parts.includes(loc)) parts.push(loc);
+  }
+
+  const locationLine = parts.length > 0 ? parts.join(", ") : null;
+
+  const concern = getDeliveryConcern(course);
+  let deliveryNote: string | null = null;
+  if (concern === "online") deliveryNote = "Online";
+  else if (concern === "internet") deliveryNote = "Internet";
+  else if (concern === "hybrid") deliveryNote = "Hybrid";
+  else if (concern === "off-campus") deliveryNote = "Off-campus";
+
+  if (locationLine && deliveryNote) return `${locationLine}\n${deliveryNote}`;
+  if (locationLine) return locationLine;
+  if (deliveryNote) return deliveryNote;
+  return null;
+}
+
+/** Number of open seats in a course section */
+export function openSeats(course: CourseResponse): number {
+  return Math.max(0, course.maxEnrollment - course.enrollment);
+}
+
+/** Text color class for seat availability: red (full), yellow (low), green (open) */
+export function seatsColor(course: CourseResponse): string {
+  const open = openSeats(course);
+  if (open === 0) return "text-status-red";
+  if (open <= 5) return "text-yellow-500";
+  return "text-status-green";
+}
+
+/** Background dot color class for seat availability */
+export function seatsDotColor(course: CourseResponse): string {
+  const open = openSeats(course);
+  if (open === 0) return "bg-red-500";
+  if (open <= 5) return "bg-yellow-500";
+  return "bg-green-500";
+}
+
+/** Minimum number of ratings needed to consider RMP data reliable */
+export const RMP_CONFIDENCE_THRESHOLD = 7;
+
+/** RMP professor page URL from legacy ID */
+export function rmpUrl(legacyId: number): string {
+  return `https://www.ratemyprofessors.com/professor/${legacyId}`;
+}
+
+/**
+ * Smooth OKLCH color + text-shadow for a RateMyProfessors rating.
+ *
+ * Three-stop gradient interpolated in OKLCH:
+ *   1.0 → red, 3.0 → amber, 5.0 → green
+ * with separate light/dark mode tuning.
+ */
+export function ratingStyle(rating: number, isDark: boolean): string {
+  const clamped = Math.max(1, Math.min(5, rating));
+
+  // OKLCH stops: [lightness, chroma, hue]
+  const stops: { light: [number, number, number]; dark: [number, number, number] }[] = [
+    { light: [0.63, 0.2, 25], dark: [0.7, 0.19, 25] }, // 1.0 – red
+    { light: [0.7, 0.16, 85], dark: [0.78, 0.15, 85] }, // 3.0 – amber
+    { light: [0.65, 0.2, 145], dark: [0.72, 0.19, 145] }, // 5.0 – green
+  ];
+
+  let t: number;
+  let fromIdx: number;
+  if (clamped <= 3) {
+    t = (clamped - 1) / 2;
+    fromIdx = 0;
+  } else {
+    t = (clamped - 3) / 2;
+    fromIdx = 1;
+  }
+
+  const from = isDark ? stops[fromIdx].dark : stops[fromIdx].light;
+  const to = isDark ? stops[fromIdx + 1].dark : stops[fromIdx + 1].light;
+
+  const l = from[0] + (to[0] - from[0]) * t;
+  const c = from[1] + (to[1] - from[1]) * t;
+  const h = from[2] + (to[2] - from[2]) * t;
+
+  return `color: oklch(${l.toFixed(3)} ${c.toFixed(3)} ${h.toFixed(1)}); text-shadow: 0 0 4px oklch(${l.toFixed(3)} ${c.toFixed(3)} ${h.toFixed(1)} / 0.3);`;
+}
+
 /** Format credit hours display */
 export function formatCreditHours(course: CourseResponse): string {
  if (course.creditHours != null) return String(course.creditHours);
@@ -127,3 +415,24 @@ export function formatCreditHours(course: CourseResponse): string {
  }
  return "—";
 }
+
+/**
+ * Convert Banner "Last, First Middle" → "First Middle Last".
+ * Handles: no comma (returned as-is), trailing/leading spaces,
+ * middle names/initials preserved.
+ */
+export function formatInstructorName(displayName: string): string {
+  const commaIdx = displayName.indexOf(",");
+  if (commaIdx === -1) return displayName.trim();
+
+  const last = displayName.slice(0, commaIdx).trim();
+  const rest = displayName.slice(commaIdx + 1).trim();
+  if (!rest) return last;
+
+  return `${rest} ${last}`;
+}
+
+/** Check if a rating value represents real data (not the 0.0 placeholder for unrated professors). */
+export function isRatingValid(avgRating: number | null, numRatings: number): boolean {
+  return avgRating !== null && !(avgRating === 0 && numRatings === 0);
+}
@@ -0,0 +1,13 @@
+import { format, formatDistanceToNow } from "date-fns";
+
+/** Returns a relative time string like "3 minutes ago" or "in 2 hours". */
+export function formatRelativeDate(date: string | Date): string {
+  const d = typeof date === "string" ? new Date(date) : date;
+  return formatDistanceToNow(d, { addSuffix: true });
+}
+
+/** Returns a full absolute datetime string for tooltip display, e.g. "Jan 29, 2026, 3:45:12 PM". */
+export function formatAbsoluteDate(date: string | Date): string {
+  const d = typeof date === "string" ? new Date(date) : date;
+  return format(d, "MMM d, yyyy, h:mm:ss a");
+}
@@ -0,0 +1,131 @@
+import { describe, expect, it } from "vitest";
+import { formatDiffPath, jsonDiff, tryParseJson } from "./diff";
+
+describe("jsonDiff", () => {
+  describe("scalars", () => {
+    it("returns empty array for identical primitives", () => {
+      expect(jsonDiff(42, 42)).toEqual([]);
+      expect(jsonDiff("hello", "hello")).toEqual([]);
+      expect(jsonDiff(true, true)).toEqual([]);
+      expect(jsonDiff(null, null)).toEqual([]);
+    });
+
+    it("returns single entry for different primitives", () => {
+      expect(jsonDiff("Open", "Closed")).toEqual([{ path: "", oldVal: "Open", newVal: "Closed" }]);
+      expect(jsonDiff(25, 30)).toEqual([{ path: "", oldVal: 25, newVal: 30 }]);
+      expect(jsonDiff(true, false)).toEqual([{ path: "", oldVal: true, newVal: false }]);
+    });
+
+    it("returns entry when types differ", () => {
+      expect(jsonDiff(1, "1")).toEqual([{ path: "", oldVal: 1, newVal: "1" }]);
+      expect(jsonDiff(null, 0)).toEqual([{ path: "", oldVal: null, newVal: 0 }]);
+    });
+  });
+
+  describe("objects", () => {
+    it("detects changed key", () => {
+      expect(jsonDiff({ a: 1 }, { a: 2 })).toEqual([{ path: ".a", oldVal: 1, newVal: 2 }]);
+    });
+
+    it("detects added key", () => {
+      expect(jsonDiff({}, { a: 1 })).toEqual([{ path: ".a", oldVal: undefined, newVal: 1 }]);
+    });
+
+    it("detects removed key", () => {
+      expect(jsonDiff({ a: 1 }, {})).toEqual([{ path: ".a", oldVal: 1, newVal: undefined }]);
+    });
+
+    it("handles deeply nested changes", () => {
+      const oldVal = { a: { b: { c: 1 } } };
+      const newVal = { a: { b: { c: 2 } } };
+      expect(jsonDiff(oldVal, newVal)).toEqual([{ path: ".a.b.c", oldVal: 1, newVal: 2 }]);
+    });
+
+    it("returns empty for identical objects", () => {
+      expect(jsonDiff({ a: 1, b: "x" }, { a: 1, b: "x" })).toEqual([]);
+    });
+  });
+
+  describe("arrays", () => {
+    it("detects changed element", () => {
+      expect(jsonDiff([1, 2, 3], [1, 99, 3])).toEqual([{ path: "[1]", oldVal: 2, newVal: 99 }]);
+    });
+
+    it("detects added element (new array longer)", () => {
+      expect(jsonDiff([1], [1, 2])).toEqual([{ path: "[1]", oldVal: undefined, newVal: 2 }]);
+    });
+
+    it("detects removed element (new array shorter)", () => {
+      expect(jsonDiff([1, 2], [1])).toEqual([{ path: "[1]", oldVal: 2, newVal: undefined }]);
+    });
+
+    it("returns empty for identical arrays", () => {
+      expect(jsonDiff([1, 2, 3], [1, 2, 3])).toEqual([]);
+    });
+  });
+
+  describe("mixed nesting", () => {
+    it("handles array of objects", () => {
+      const oldVal = [{ name: "Alice" }, { name: "Bob" }];
+      const newVal = [{ name: "Alice" }, { name: "Charlie" }];
+      expect(jsonDiff(oldVal, newVal)).toEqual([
+        { path: "[1].name", oldVal: "Bob", newVal: "Charlie" },
+      ]);
+    });
+
+    it("handles object with nested arrays", () => {
+      const oldVal = { meetingTimes: [{ beginTime: "0900" }] };
+      const newVal = { meetingTimes: [{ beginTime: "1000" }] };
+      expect(jsonDiff(oldVal, newVal)).toEqual([
+        { path: ".meetingTimes[0].beginTime", oldVal: "0900", newVal: "1000" },
+      ]);
+    });
+
+    it("handles type change from object to array", () => {
+      expect(jsonDiff({ a: 1 }, [1])).toEqual([{ path: "", oldVal: { a: 1 }, newVal: [1] }]);
+    });
+  });
+});
+
+describe("tryParseJson", () => {
+  it("parses valid JSON object", () => {
+    expect(tryParseJson('{"a":1}')).toEqual({ a: 1 });
+  });
+
+  it("parses valid JSON array", () => {
+    expect(tryParseJson("[1,2,3]")).toEqual([1, 2, 3]);
+  });
+
+  it("parses plain string numbers", () => {
+    expect(tryParseJson("42")).toBe(42);
+    expect(tryParseJson("3.14")).toBe(3.14);
+  });
+
+  it("returns null for invalid JSON", () => {
+    expect(tryParseJson("not json")).toBeNull();
+    expect(tryParseJson("{broken")).toBeNull();
+  });
+
+  it("parses boolean and null literals", () => {
+    expect(tryParseJson("true")).toBe(true);
+    expect(tryParseJson("null")).toBeNull();
+  });
+});
+
+describe("formatDiffPath", () => {
+  it("strips leading dot", () => {
+    expect(formatDiffPath(".a.b.c")).toBe("a.b.c");
+  });
+
+  it("returns (root) for empty path", () => {
+    expect(formatDiffPath("")).toBe("(root)");
+  });
+
+  it("preserves bracket notation", () => {
+    expect(formatDiffPath("[0].name")).toBe("[0].name");
+  });
+
+  it("handles mixed paths", () => {
+    expect(formatDiffPath(".meetingTimes[0].beginTime")).toBe("meetingTimes[0].beginTime");
+  });
+});
@@ -0,0 +1,86 @@
+export interface DiffEntry {
+  path: string;
+  oldVal: unknown;
+  newVal: unknown;
+}
+
+function isObject(val: unknown): val is Record<string, unknown> {
+  return val !== null && typeof val === "object" && !Array.isArray(val);
+}
+
+/**
+ * Recursively compares two JSON-compatible values and returns a list of
+ * structural differences with dot-notation paths.
+ */
+export function jsonDiff(oldVal: unknown, newVal: unknown): DiffEntry[] {
+  return diffRecurse("", oldVal, newVal);
+}
+
+function diffRecurse(path: string, oldVal: unknown, newVal: unknown): DiffEntry[] {
+  // Both arrays: compare by index up to max length
+  if (Array.isArray(oldVal) && Array.isArray(newVal)) {
+    const entries: DiffEntry[] = [];
+    const maxLen = Math.max(oldVal.length, newVal.length);
+    for (let i = 0; i < maxLen; i++) {
+      const childPath = `${path}[${i}]`;
+      const inOld = i < oldVal.length;
+      const inNew = i < newVal.length;
+      if (inOld && inNew) {
+        entries.push(...diffRecurse(childPath, oldVal[i], newVal[i]));
+      } else if (inNew) {
+        entries.push({ path: childPath, oldVal: undefined, newVal: newVal[i] });
+      } else {
+        entries.push({ path: childPath, oldVal: oldVal[i], newVal: undefined });
+      }
+    }
+    return entries;
+  }
+
+  // Both objects: iterate union of keys
+  if (isObject(oldVal) && isObject(newVal)) {
+    const entries: DiffEntry[] = [];
+    const allKeys = new Set([...Object.keys(oldVal), ...Object.keys(newVal)]);
+    for (const key of allKeys) {
+      const childPath = `${path}.${key}`;
+      const inOld = key in oldVal;
+      const inNew = key in newVal;
+      if (inOld && inNew) {
+        entries.push(...diffRecurse(childPath, oldVal[key], newVal[key]));
+      } else if (inNew) {
+        entries.push({ path: childPath, oldVal: undefined, newVal: newVal[key] });
+      } else {
+        entries.push({ path: childPath, oldVal: oldVal[key], newVal: undefined });
+      }
+    }
+    return entries;
+  }
+
+  // Leaf comparison (primitives, or type mismatch between object/array/primitive)
+  if (oldVal !== newVal) {
+    return [{ path, oldVal, newVal }];
+  }
+
+  return [];
+}
+
+/**
+ * Cleans up a diff path for display. Strips the leading dot produced by
+ * object-key paths, and returns "(root)" for the empty root path.
+ */
+export function formatDiffPath(path: string): string {
+  if (path === "") return "(root)";
+  if (path.startsWith(".")) return path.slice(1);
+  return path;
+}
+
+/**
+ * Attempts to parse a string as JSON. Returns the parsed value on success,
+ * or null if parsing fails. Used by the audit log to detect JSON values.
+ */
+export function tryParseJson(value: string): unknown | null {
+  try {
+    return JSON.parse(value);
+  } catch {
+    return null;
+  }
+}
@@ -0,0 +1,52 @@
+import { beforeNavigate } from "$app/navigation";
+
+export type NavDirection = "left" | "right" | "fade";
+
+/** Sidebar nav order — indexes determine slide direction for same-depth siblings */
+const SIDEBAR_NAV_ORDER = [
+  "/profile",
+  "/settings",
+  "/admin",
+  "/admin/jobs",
+  "/admin/audit",
+  "/admin/users",
+];
+
+function getDepth(path: string): number {
+  return path.replace(/\/$/, "").split("/").filter(Boolean).length;
+}
+
+function getSidebarIndex(path: string): number {
+  return SIDEBAR_NAV_ORDER.indexOf(path);
+}
+
+function computeDirection(from: string, to: string): NavDirection {
+  const fromDepth = getDepth(from);
+  const toDepth = getDepth(to);
+
+  if (toDepth > fromDepth) return "right";
+  if (toDepth < fromDepth) return "left";
+
+  // Same depth — use sidebar ordering if both are sidebar routes
+  const fromIdx = getSidebarIndex(from);
+  const toIdx = getSidebarIndex(to);
+  if (fromIdx >= 0 && toIdx >= 0) {
+    return toIdx > fromIdx ? "right" : "left";
+  }
+
+  return "fade";
+}
+
+class NavigationStore {
+  direction: NavDirection = $state("fade");
+}
+
+export const navigationStore = new NavigationStore();
+
+/** Call once from root layout to start tracking navigation direction */
+export function initNavigation() {
+  beforeNavigate(({ from, to }) => {
+    if (!from?.url || !to?.url) return;
+    navigationStore.direction = computeDirection(from.url.pathname, to.url.pathname);
+  });
+}
@@ -1,69 +1,78 @@
 /**
 * Relative time formatting with adaptive refresh intervals.
 *
- * The key insight: a timestamp showing "3 seconds ago" needs to update every second,
- * but "2 hours ago" only needs to update every minute. This module provides both
+ * The key insight: a timestamp showing "3s" needs to update every second,
+ * but "2h 15m" only needs to update every minute. This module provides both
 * the formatted string and the optimal interval until the next meaningful change.
 */

 interface RelativeTimeResult {
-  /** The human-readable relative time string (e.g. "3 seconds ago") */
+  /** Compact relative time string (e.g. "9m 35s", "1h 23m", "3d") */
  text: string;
  /** Milliseconds until the displayed text would change */
  nextUpdateMs: number;
 }

 /**
- * Compute a relative time string and the interval until it next changes.
+ * Format a duration in milliseconds as a compact human-readable string.
 *
- * Granularity tiers:
- * - < 60s: per-second ("1 second ago", "45 seconds ago")
- * - < 60m: per-minute ("1 minute ago", "12 minutes ago")
- * - < 24h: per-hour ("1 hour ago", "5 hours ago")
- * - >= 24h: per-day ("1 day ago", "3 days ago")
+ * Format tiers:
+ * - < 60s: seconds only ("45s")
+ * - < 1h: minutes + seconds ("9m 35s")
+ * - < 24h: hours + minutes ("1h 23m")
+ * - >= 24h: days only ("3d")
+ */
+export function formatDuration(ms: number): string {
+  const totalSeconds = Math.floor(Math.abs(ms) / 1000);
+
+  if (totalSeconds < 60) return `${totalSeconds}s`;
+
+  const totalMinutes = Math.floor(totalSeconds / 60);
+  if (totalMinutes < 60) {
+    const secs = totalSeconds % 60;
+    return `${totalMinutes}m ${secs}s`;
+  }
+
+  const totalHours = Math.floor(totalMinutes / 60);
+  if (totalHours < 24) {
+    const mins = totalMinutes % 60;
+    return `${totalHours}h ${mins}m`;
+  }
+
+  const days = Math.floor(totalHours / 24);
+  return `${days}d`;
+}
+
+/**
+ * Compute a compact relative time string and the interval until it next changes.
+ *
+ * Uses {@link formatDuration} for the text, plus computes the optimal refresh
+ * interval so callers can schedule the next update efficiently.
 */
 export function relativeTime(date: Date, ref: Date): RelativeTimeResult {
  const diffMs = ref.getTime() - date.getTime();
-  const seconds = Math.round(diffMs / 1000);
+  const totalSeconds = Math.floor(diffMs / 1000);

-  if (seconds < 1) {
-    return { text: "just now", nextUpdateMs: 1000 - (diffMs % 1000) || 1000 };
+  if (totalSeconds < 1) {
+    return { text: "now", nextUpdateMs: 1000 - (diffMs % 1000) || 1000 };
  }

-  if (seconds < 60) {
-    const remainder = 1000 - (diffMs % 1000);
-    return {
-      text: seconds === 1 ? "1 second ago" : `${seconds} seconds ago`,
-      nextUpdateMs: remainder || 1000,
-    };
-  }
+  const text = formatDuration(diffMs);

-  const minutes = Math.floor(seconds / 60);
-  if (minutes < 60) {
-    // Update when the next minute boundary is crossed
+  // Compute optimal next-update interval based on the current tier
+  const totalMinutes = Math.floor(totalSeconds / 60);
+  const totalHours = Math.floor(totalMinutes / 60);
+
+  let nextUpdateMs: number;
+  if (totalHours >= 24) {
+    const msIntoCurrentDay = diffMs % 86_400_000;
+    nextUpdateMs = 86_400_000 - msIntoCurrentDay || 86_400_000;
+  } else if (totalMinutes >= 60) {
    const msIntoCurrentMinute = diffMs % 60_000;
-    const msUntilNextMinute = 60_000 - msIntoCurrentMinute;
-    return {
-      text: minutes === 1 ? "1 minute ago" : `${minutes} minutes ago`,
-      nextUpdateMs: msUntilNextMinute || 60_000,
-    };
+    nextUpdateMs = 60_000 - msIntoCurrentMinute || 60_000;
+  } else {
+    nextUpdateMs = 1000 - (diffMs % 1000) || 1000;
  }

-  const hours = Math.floor(minutes / 60);
-  if (hours < 24) {
-    const msIntoCurrentHour = diffMs % 3_600_000;
-    const msUntilNextHour = 3_600_000 - msIntoCurrentHour;
-    return {
-      text: hours === 1 ? "1 hour ago" : `${hours} hours ago`,
-      nextUpdateMs: msUntilNextHour || 3_600_000,
-    };
-  }
-
-  const days = Math.floor(hours / 24);
-  const msIntoCurrentDay = diffMs % 86_400_000;
-  const msUntilNextDay = 86_400_000 - msIntoCurrentDay;
-  return {
-    text: days === 1 ? "1 day ago" : `${days} days ago`,
-    nextUpdateMs: msUntilNextDay || 86_400_000,
-  };
+  return { text, nextUpdateMs };
 }
@@ -0,0 +1,108 @@
+/**
+ * Animation-map management for the timeline's stacked-area transitions.
+ *
+ * Each visible slot has per-subject animated values that lerp toward
+ * targets. This module owns the AnimMap lifecycle: syncing targets,
+ * stepping current values, and pruning offscreen entries.
+ */
+import { SUBJECTS, type Subject } from "./data";
+import { VALUE_EASE, MAXY_EASE, SETTLE_THRESHOLD, MIN_MAXY } from "./constants";
+import type { AnimEntry, TimeSlot } from "./types";
+
+export type AnimMap = Map<number, Map<string, AnimEntry>>;
+
+/** Create a fresh, empty animation map. */
+export function createAnimMap(): AnimMap {
+  return new Map();
+}
+
+/**
+ * Sync animMap targets from data + filter state.
+ * New slots start at current=0 so they animate in from the baseline.
+ * Disabled subjects get target=0 so they animate out.
+ */
+export function syncAnimTargets(
+  animMap: AnimMap,
+  slots: TimeSlot[],
+  enabledSubjects: Set<Subject>
+): void {
+  for (const slot of slots) {
+    const timeMs = slot.time.getTime();
+    let subjectMap = animMap.get(timeMs);
+    if (!subjectMap) {
+      subjectMap = new Map();
+      animMap.set(timeMs, subjectMap);
+    }
+
+    for (const subject of SUBJECTS) {
+      const realValue = enabledSubjects.has(subject) ? slot.subjects[subject] || 0 : 0;
+      const entry = subjectMap.get(subject);
+      if (entry) {
+        entry.target = realValue;
+      } else {
+        subjectMap.set(subject, { current: 0, target: realValue });
+      }
+    }
+  }
+}
+
+/**
+ * Advance all animated values toward their targets.
+ * Returns the new animatedMaxY value and whether any entry is still moving.
+ */
+export function stepAnimations(
+  animMap: AnimMap,
+  dt: number,
+  prevMaxY: number
+): { animating: boolean; maxY: number } {
+  const ease = 1 - Math.pow(1 - VALUE_EASE, dt / 16);
+  let animating = false;
+  let computedMaxY = MIN_MAXY;
+
+  for (const subjectMap of animMap.values()) {
+    let slotSum = 0;
+    for (const entry of subjectMap.values()) {
+      const diff = entry.target - entry.current;
+      if (Math.abs(diff) < SETTLE_THRESHOLD) {
+        if (entry.current !== entry.target) {
+          entry.current = entry.target;
+        }
+      } else {
+        entry.current += diff * ease;
+        animating = true;
+      }
+      slotSum += entry.current;
+    }
+    if (slotSum > computedMaxY) computedMaxY = slotSum;
+  }
+
+  const maxYEase = 1 - Math.pow(1 - MAXY_EASE, dt / 16);
+  const maxDiff = computedMaxY - prevMaxY;
+  let maxY: number;
+  if (Math.abs(maxDiff) < SETTLE_THRESHOLD) {
+    maxY = computedMaxY;
+  } else {
+    maxY = prevMaxY + maxDiff * maxYEase;
+    animating = true;
+  }
+
+  return { animating, maxY };
+}
+
+/**
+ * Remove animMap entries whose timestamps fall outside the viewport
+ * (with margin), preventing unbounded memory growth during long sessions.
+ */
+export function pruneAnimMap(
+  animMap: AnimMap,
+  viewStart: number,
+  viewEnd: number,
+  viewSpan: number
+): void {
+  const margin = viewSpan;
+  for (const timeMs of animMap.keys()) {
+    if (timeMs < viewStart - margin || timeMs > viewEnd + margin) {
+      animMap.delete(timeMs);
+    }
+  }
+}
@@ -0,0 +1,79 @@
+/** Layout & padding */
+export const PADDING = { top: 20, right: 0, bottom: 40, left: 0 } as const;
+export const DEFAULT_AXIS_RATIO = 0.8;
+export const CHART_HEIGHT_RATIO = 0.6;
+
+/** Viewport span limits (ms) */
+export const MIN_SPAN_MS = 5 * 60 * 1000;
+export const MAX_SPAN_MS = 72 * 60 * 60 * 1000;
+export const DEFAULT_SPAN_MS = 36 * 60 * 60 * 1000;
+
+/** Slot interval (15 minutes) */
+export const SLOT_INTERVAL_MS = 15 * 60 * 1000;
+
+/** Zoom */
+export const ZOOM_FACTOR = 1.15;
+export const ZOOM_KEY_FACTOR = 1.25;
+export const ZOOM_EASE = 0.12;
+export const ZOOM_SETTLE_THRESHOLD = 100;
+
+/** Grid rendering */
+export const GRID_ALPHA = 0.15;
+export const HOUR_GRID_ALPHA = 0.25;
+
+/** Now line */
+export const NOW_LINE_WIDTH = 2;
+export const NOW_LINE_COLOR = "#ef4444";
+export const NOW_TRIANGLE_HEIGHT = 6;
+export const NOW_TRIANGLE_HALF_WIDTH = 5;
+export const NOW_LABEL_FONT = "bold 10px Inter, system-ui, sans-serif";
+
+/** Hover highlight */
+export const HOVER_HIGHLIGHT_ALPHA = 0.25;
+
+/** Stacked area */
+export const AREA_FILL_ALPHA = 0.82;
+export const AREA_STROKE_ALPHA = 0.4;
+
+/** Physics / momentum */
+export const PAN_FRICTION = 0.94;
+export const PAN_STOP_THRESHOLD = 0.5;
+export const PAN_STOP_THRESHOLD_Y = 0.01;
+export const VELOCITY_SAMPLE_WINDOW = 80;
+export const VELOCITY_MIN_DT = 5;
+
+/** Keyboard panning */
+export const PAN_STEP_RATIO = 0.1;
+export const PAN_STEP_CTRL_RATIO = 0.35;
+export const PAN_EASE = 0.12;
+export const PAN_SETTLE_THRESHOLD_PX = 1;
+
+/** Y-axis panning */
+export const YRATIO_STEP = 0.03;
+export const YRATIO_MIN = 0.3;
+export const YRATIO_MAX = 1.2;
+export const YRATIO_SETTLE_THRESHOLD = 0.001;
+
+/** Follow mode */
+export const FOLLOW_EASE = 0.03;
+
+/** Animation */
+export const VALUE_EASE = 0.12;
+export const MAXY_EASE = 0.4;
+export const SETTLE_THRESHOLD = 0.5;
+export const MIN_MAXY = 60;
+export const MAX_DT = 50;
+export const DEFAULT_DT = 16;
+
+/** Visible-slot margin for smooth curve edges at viewport boundaries */
+export const RENDER_MARGIN_SLOTS = 3;
+
+/** Drawer */
+export const DRAWER_WIDTH = 220;
+
+/** Touch / tap */
+export const TAP_MAX_DURATION_MS = 250;
+export const TAP_MAX_DISTANCE_PX = 10;
+
+/** Axis text */
+export const AXIS_FONT = "11px Inter, system-ui, sans-serif";
@@ -0,0 +1,122 @@
+/**
+ * Data types, constants, and deterministic slot generation for the class timeline.
+ * Each 15-minute slot is seeded by its timestamp, so the same slot always produces
+ * identical data regardless of when or in what order it's fetched.
+ */
+import { SLOT_INTERVAL_MS } from "./constants";
+import type { TimeSlot } from "./types";
+
+export type { TimeSlot };
+
+export const SUBJECTS = [
+  "CS",
+  "MATH",
+  "BIO",
+  "ENG",
+  "PHYS",
+  "HIST",
+  "CHEM",
+  "PSY",
+  "ECE",
+  "ART",
+] as const;
+
+export type Subject = (typeof SUBJECTS)[number];
+
+/** Subject colors — distinct, accessible palette */
+export const SUBJECT_COLORS: Record<Subject, string> = {
+  CS: "#6366f1", // indigo
+  MATH: "#f59e0b", // amber
+  BIO: "#10b981", // emerald
+  ENG: "#ef4444", // red
+  PHYS: "#3b82f6", // blue
+  HIST: "#8b5cf6", // violet
+  CHEM: "#f97316", // orange
+  PSY: "#ec4899", // pink
+  ECE: "#14b8a6", // teal
+  ART: "#a855f7", // purple
+};
+
+/**
+ * Bell-curve-like distribution centered at a given hour.
+ * Returns a value 0..1 representing relative class density.
+ */
+function bellCurve(hour: number, center: number, spread: number): number {
+  const x = (hour - center) / spread;
+  return Math.exp(-0.5 * x * x);
+}
+
+/**
+ * Each subject has characteristic scheduling patterns:
+ * peak hours, relative popularity, and spread.
+ */
+const SUBJECT_PROFILES: Record<Subject, { peaks: number[]; weight: number; spread: number }> = {
+  CS: { peaks: [10, 14, 16], weight: 12, spread: 2.0 },
+  MATH: { peaks: [8, 10, 13], weight: 10, spread: 1.8 },
+  BIO: { peaks: [9, 11, 14], weight: 8, spread: 1.5 },
+  ENG: { peaks: [9, 11, 14, 16], weight: 7, spread: 2.2 },
+  PHYS: { peaks: [8, 13, 15], weight: 6, spread: 1.6 },
+  HIST: { peaks: [10, 13, 15], weight: 5, spread: 2.0 },
+  CHEM: { peaks: [8, 10, 14], weight: 6, spread: 1.5 },
+  PSY: { peaks: [11, 14, 16], weight: 7, spread: 2.0 },
+  ECE: { peaks: [9, 13, 15], weight: 5, spread: 1.8 },
+  ART: { peaks: [10, 14, 17], weight: 4, spread: 2.5 },
+};
+
+/**
+ * Seeded pseudo-random number generator (LCG) for reproducible data.
+ */
+function seededRandom(seed: number): () => number {
+  let s = seed;
+  return () => {
+    s = (s * 1664525 + 1013904223) & 0xffffffff;
+    return (s >>> 0) / 0xffffffff;
+  };
+}
+
+/**
+ * Integer hash so adjacent slot timestamps produce very different seeds.
+ */
+function hashTimestamp(ms: number): number {
+  let h = ms | 0;
+  h = ((h >> 16) ^ h) * 0x45d9f3b;
+  h = ((h >> 16) ^ h) * 0x45d9f3b;
+  h = (h >> 16) ^ h;
+  return h >>> 0;
+}
+
+/** Generate a single TimeSlot for the given aligned timestamp. */
+function generateSlot(timeMs: number): TimeSlot {
+  const rand = seededRandom(hashTimestamp(timeMs));
+  const time = new Date(timeMs);
+  const hour = time.getHours() + time.getMinutes() / 60;
+
+  const subjects = {} as Record<Subject, number>;
+  for (const subject of SUBJECTS) {
+    const profile = SUBJECT_PROFILES[subject];
+    let density = 0;
+    for (const peak of profile.peaks) {
+      density += bellCurve(hour, peak, profile.spread);
+    }
+    const base = density * profile.weight;
+    const noise = (rand() - 0.5) * 2;
+    subjects[subject] = Math.max(0, Math.round(base + noise));
+  }
+
+  return { time, subjects };
+}
+
+/**
+ * Generate TimeSlots covering [startMs, endMs], aligned to 15-minute boundaries.
+ * Each slot is deterministically seeded by its timestamp.
+ */
+export function generateSlots(startMs: number, endMs: number): TimeSlot[] {
+  const alignedStart = Math.floor(startMs / SLOT_INTERVAL_MS) * SLOT_INTERVAL_MS;
+  const alignedEnd = Math.ceil(endMs / SLOT_INTERVAL_MS) * SLOT_INTERVAL_MS;
+
+  const slots: TimeSlot[] = [];
+  for (let t = alignedStart; t <= alignedEnd; t += SLOT_INTERVAL_MS) {
+    slots.push(generateSlot(t));
+  }
+  return slots;
+}
@@ -0,0 +1,291 @@
+/**
+ * Pure canvas rendering functions for the timeline chart.
+ *
+ * Every function takes a {@link ChartContext} plus any data it needs.
+ * No Svelte reactivity, no side-effects beyond drawing on the context.
+ */
+import { stack, area, curveMonotoneX, type Series } from "d3-shape";
+import { timeFormat } from "d3-time-format";
+
+import { SUBJECT_COLORS, type Subject } from "./data";
+import type { AnimMap } from "./animation";
+import { getStackSubjects } from "./viewport";
+import type { ChartContext, TimeSlot } from "./types";
+import {
+  GRID_ALPHA,
+  HOUR_GRID_ALPHA,
+  NOW_LINE_WIDTH,
+  NOW_LINE_COLOR,
+  NOW_TRIANGLE_HEIGHT,
+  NOW_TRIANGLE_HALF_WIDTH,
+  NOW_LABEL_FONT,
+  HOVER_HIGHLIGHT_ALPHA,
+  AREA_FILL_ALPHA,
+  AREA_STROKE_ALPHA,
+  SLOT_INTERVAL_MS,
+  SETTLE_THRESHOLD,
+  AXIS_FONT,
+} from "./constants";
+
+// ── Formatters (allocated once) ─────────────────────────────────────
+const fmtHour = timeFormat("%-I %p");
+const fmtAxisDetailed = timeFormat("%-I:%M %p");
+const fmtAxisCoarse = timeFormat("%-I %p");
+const fmtNow = timeFormat("%-I:%M %p");
+
+// ── Stacked-area types ──────────────────────────────────────────────
+type StackPoint = Series<TimeSlot, string>[number];
+export type VisibleStack = Series<TimeSlot, string>[];
+
+// ── Tick count heuristic ────────────────────────────────────────────
+
+/** Choose the number of x-axis ticks based on the viewport span. */
+export function chooseTickCount(viewSpan: number): number {
+  const spanHours = viewSpan / (60 * 60 * 1000);
+  if (spanHours <= 1) return 12;
+  if (spanHours <= 3) return 12;
+  if (spanHours <= 8) return 16;
+  if (spanHours <= 14) return 14;
+  return 10;
+}
+
+// ── Stack computation ───────────────────────────────────────────────
+
+/**
+ * Stack only the visible slice using *animated* values so transitions
+ * between filter/data states are smooth. Includes subjects that are
+ * still animating out so removal is gradual.
+ */
+export function stackVisibleSlots(
+  visible: TimeSlot[],
+  enabledSubjects: Set<Subject>,
+  animMap: AnimMap
+): VisibleStack {
+  if (visible.length === 0) return [];
+
+  const stackKeys = getStackSubjects(visible, enabledSubjects, animMap, SETTLE_THRESHOLD);
+  if (stackKeys.length === 0) return [];
+
+  // Build synthetic slots with animated current values.
+  const animatedSlots: TimeSlot[] = visible.map((slot) => {
+    const timeMs = slot.time.getTime();
+    const subjectMap = animMap.get(timeMs);
+    const subjects = {} as Record<Subject, number>;
+    for (const subject of stackKeys) {
+      const entry = subjectMap?.get(subject);
+      subjects[subject] = entry ? entry.current : slot.subjects[subject] || 0;
+    }
+    return { time: slot.time, subjects };
+  });
+
+  const gen = stack<TimeSlot>()
+    .keys(stackKeys)
+    .value((d, key) => d.subjects[key as Subject] || 0);
+  return gen(animatedSlots);
+}
+
+// ── Drawing functions ───────────────────────────────────────────────
+
+export function drawGrid(chart: ChartContext): void {
+  const { ctx, xScale, chartTop, chartBottom, width, viewSpan, viewStart, viewEnd } = chart;
+  const tickCount = chooseTickCount(viewSpan);
+
+  ctx.save();
+  ctx.lineWidth = 1;
+
+  // Minor tick grid lines
+  const ticks = xScale.ticks(tickCount);
+  ctx.strokeStyle = `rgba(128, 128, 128, ${GRID_ALPHA})`;
+  for (const tick of ticks) {
+    if (tick.getMinutes() === 0) continue;
+    const x = Math.round(xScale(tick)) + 0.5;
+    if (x < 0 || x > width) continue;
+    ctx.beginPath();
+    ctx.moveTo(x, chartTop);
+    ctx.lineTo(x, chartBottom);
+    ctx.stroke();
+  }
+
+  // Hourly grid lines with labels
+  const spanHours = viewSpan / (60 * 60 * 1000);
+  let hourStep = 1;
+  if (spanHours > 48) hourStep = 6;
+  else if (spanHours > 24) hourStep = 4;
+  else if (spanHours > 12) hourStep = 2;
+
+  const startHour = new Date(viewStart);
+  startHour.setMinutes(0, 0, 0);
+  if (hourStep > 1) {
+    const h = startHour.getHours();
+    startHour.setHours(Math.ceil(h / hourStep) * hourStep);
+  } else if (startHour.getTime() < viewStart) {
+    startHour.setHours(startHour.getHours() + 1);
+  }
+
+  const hourStepMs = hourStep * 60 * 60 * 1000;
+  for (let t = startHour.getTime(); t <= viewEnd; t += hourStepMs) {
+    const d = new Date(t);
+    const x = Math.round(xScale(d)) + 0.5;
+    if (x < 0 || x > width) continue;
+
+    ctx.strokeStyle = `rgba(128, 128, 128, ${HOUR_GRID_ALPHA})`;
+    ctx.beginPath();
+    ctx.moveTo(x, chartTop);
+    ctx.lineTo(x, chartBottom);
+    ctx.stroke();
+
+    ctx.fillText(fmtHour(d), x + 5, chartTop + 6);
+  }
+
+  ctx.restore();
+}
+
+/**
+ * Trace the top outline of the stacked area onto `ctx` as a clip path.
+ */
+function traceStackOutline(chart: ChartContext, visibleStack: VisibleStack): void {
+  if (visibleStack.length === 0) return;
+  const { ctx, xScale, yScale } = chart;
+  const topLayer = visibleStack[visibleStack.length - 1];
+
+  ctx.beginPath();
+  area<StackPoint>()
+    .x((d) => xScale(d.data.time))
+    .y0(() => yScale(0))
+    .y1((d) => yScale(d[1]))
+    .curve(curveMonotoneX)
+    .context(ctx)(topLayer as unknown as StackPoint[]);
+}
+
+export function drawHoverColumn(
+  chart: ChartContext,
+  visibleStack: VisibleStack,
+  hoverSlotTime: number | null
+): void {
+  if (hoverSlotTime == null || visibleStack.length === 0) return;
+  const { ctx, xScale, chartTop, chartBottom } = chart;
+
+  const x0 = xScale(new Date(hoverSlotTime));
+  const x1 = xScale(new Date(hoverSlotTime + SLOT_INTERVAL_MS));
+
+  ctx.save();
+  traceStackOutline(chart, visibleStack);
+  ctx.clip();
+
+  ctx.fillStyle = `rgba(255, 255, 255, ${HOVER_HIGHLIGHT_ALPHA})`;
+  ctx.fillRect(x0, chartTop, x1 - x0, chartBottom - chartTop);
+  ctx.restore();
+}
+
+export function drawStackedArea(chart: ChartContext, visibleStack: VisibleStack): void {
+  const { ctx, xScale, yScale, width, chartTop, chartBottom } = chart;
+
+  ctx.save();
+  ctx.beginPath();
+  ctx.rect(0, chartTop, width, chartBottom - chartTop);
+  ctx.clip();
+
+  for (let i = visibleStack.length - 1; i >= 0; i--) {
+    const layer = visibleStack[i];
+    const subject = layer.key as Subject;
+    const color = SUBJECT_COLORS[subject];
+
+    ctx.beginPath();
+    area<StackPoint>()
+      .x((d) => xScale(d.data.time))
+      .y0((d) => yScale(d[0]))
+      .y1((d) => yScale(d[1]))
+      .curve(curveMonotoneX)
+      .context(ctx)(layer as unknown as StackPoint[]);
+
+    ctx.globalAlpha = AREA_FILL_ALPHA;
+    ctx.fillStyle = color;
+    ctx.fill();
+
+    ctx.globalAlpha = AREA_STROKE_ALPHA;
+    ctx.strokeStyle = color;
+    ctx.lineWidth = 1;
+    ctx.stroke();
+  }
+
+  ctx.restore();
+}
+
+export function drawNowLine(chart: ChartContext): void {
+  const { ctx, xScale, chartTop, chartBottom } = chart;
+  const now = new Date();
+  const x = xScale(now);
+  if (x < 0 || x > chart.width) return;
+
+  ctx.save();
+
+  ctx.shadowColor = "rgba(239, 68, 68, 0.5)";
+  ctx.shadowBlur = 8;
+  ctx.strokeStyle = NOW_LINE_COLOR;
+  ctx.lineWidth = NOW_LINE_WIDTH;
+  ctx.setLineDash([]);
+
+  ctx.beginPath();
+  ctx.moveTo(x, chartTop);
+  ctx.lineTo(x, chartBottom);
+  ctx.stroke();
+
+  ctx.shadowBlur = 0;
+  ctx.fillStyle = NOW_LINE_COLOR;
+
+  // Triangle marker at chart top
+  ctx.beginPath();
+  ctx.moveTo(x - NOW_TRIANGLE_HALF_WIDTH, chartTop);
+  ctx.lineTo(x + NOW_TRIANGLE_HALF_WIDTH, chartTop);
+  ctx.lineTo(x, chartTop + NOW_TRIANGLE_HEIGHT);
+  ctx.closePath();
+  ctx.fill();
+
+  // Time label
+  ctx.font = NOW_LABEL_FONT;
+  ctx.textAlign = "left";
+  ctx.textBaseline = "bottom";
+  ctx.fillText(fmtNow(now), x + 6, chartTop - 1);
+
+  ctx.restore();
+}
+
+export function drawTimeAxis(chart: ChartContext): void {
+  const { ctx, xScale, width, chartBottom, viewSpan } = chart;
+  const tickCount = chooseTickCount(viewSpan);
+  const y = chartBottom;
+  const ticks = xScale.ticks(tickCount);
+
+  ctx.save();
+
+  // Axis baseline
+  ctx.strokeStyle = "rgba(128, 128, 128, 0.15)";
+  ctx.lineWidth = 1;
+  ctx.beginPath();
+  ctx.moveTo(0, y + 0.5);
+  ctx.lineTo(width, y + 0.5);
+  ctx.stroke();
+
+  const spanHours = viewSpan / (60 * 60 * 1000);
+  const fmt = spanHours <= 3 ? fmtAxisDetailed : fmtAxisCoarse;
+
+  ctx.fillStyle = "rgba(128, 128, 128, 0.6)";
+  ctx.font = AXIS_FONT;
+  ctx.textAlign = "center";
+  ctx.textBaseline = "top";
+
+  for (const tick of ticks) {
+    const x = xScale(tick);
+    if (x < 20 || x > width - 20) continue;
+
+    ctx.strokeStyle = "rgba(128, 128, 128, 0.2)";
+    ctx.beginPath();
+    ctx.moveTo(x, y);
+    ctx.lineTo(x, y + 4);
+    ctx.stroke();
+
+    ctx.fillText(fmt(tick), x, y + 6);
+  }
+
+  ctx.restore();
+}
@@ -0,0 +1,179 @@
+/**
+ * Reactive timeline data store with gap-aware on-demand loading.
+ *
+ * Tracks which time ranges have already been fetched and only requests
+ * the missing segments when the view expands into unloaded territory.
+ * Fetches are throttled so rapid panning/zooming doesn't flood the
+ * (currently mock) API.
+ */
+import { generateSlots } from "./data";
+import { SLOT_INTERVAL_MS } from "./constants";
+import type { TimeSlot } from "./types";
+
+/** Inclusive range of aligned slot timestamps [start, end]. */
+type Range = [start: number, end: number];
+
+const FETCH_THROTTLE_MS = 500;
+const BUFFER_RATIO = 0.15;
+
+// Mock network latency bounds (ms).
+const MOCK_DELAY_MIN = 40;
+const MOCK_DELAY_MAX = 120;
+
+/**
+ * Simulate an API call that returns slots for an arbitrary time range.
+ * The delay makes loading behaviour visible during development.
+ */
+async function mockFetch(startMs: number, endMs: number): Promise<TimeSlot[]> {
+  const delay = MOCK_DELAY_MIN + Math.random() * (MOCK_DELAY_MAX - MOCK_DELAY_MIN);
+  await new Promise((r) => setTimeout(r, delay));
+  return generateSlots(startMs, endMs);
+}
+
+/** Align a timestamp down to the nearest slot boundary. */
+function alignFloor(ms: number): number {
+  return Math.floor(ms / SLOT_INTERVAL_MS) * SLOT_INTERVAL_MS;
+}
+
+/** Align a timestamp up to the nearest slot boundary. */
+function alignCeil(ms: number): number {
+  return Math.ceil(ms / SLOT_INTERVAL_MS) * SLOT_INTERVAL_MS;
+}
+
+/**
+ * Given a requested range and a sorted list of already-loaded ranges,
+ * return the sub-ranges that still need fetching.
+ */
+function findGaps(start: number, end: number, loaded: Range[]): Range[] {
+  const s = alignFloor(start);
+  const e = alignCeil(end);
+
+  if (loaded.length === 0) return [[s, e]];
+
+  const gaps: Range[] = [];
+  let cursor = s;
+
+  for (const [ls, le] of loaded) {
+    if (le < cursor) continue; // entirely before cursor
+    if (ls > e) break; // entirely past our range
+
+    if (ls > cursor) {
+      gaps.push([cursor, Math.min(ls, e)]);
+    }
+    cursor = Math.max(cursor, le);
+  }
+
+  if (cursor < e) {
+    gaps.push([cursor, e]);
+  }
+
+  return gaps;
+}
+
+/** Merge a new range into a sorted, non-overlapping range list (mutates nothing). */
+function mergeRange(ranges: Range[], added: Range): Range[] {
+  const all = [...ranges, added].sort((a, b) => a[0] - b[0]);
+  const merged: Range[] = [];
+  for (const r of all) {
+    if (merged.length === 0 || merged[merged.length - 1][1] < r[0]) {
+      merged.push([r[0], r[1]]);
+    } else {
+      merged[merged.length - 1][1] = Math.max(merged[merged.length - 1][1], r[1]);
+    }
+  }
+  return merged;
+}
+
+/**
+ * Create a reactive timeline store.
+ *
+ * Call `requestRange(viewStart, viewEnd)` whenever the visible window
+ * changes. The store applies a 15 % buffer, computes which sub-ranges
+ * are missing, and fetches them (throttled to 500 ms).
+ *
+ * The `data` getter returns a sorted `TimeSlot[]` that reactively
+ * updates as new segments arrive.
+ */
+export function createTimelineStore() {
+  // All loaded slots keyed by aligned timestamp (ms).
+  let slotMap: Map<number, TimeSlot> = $state(new Map());
+
+  // Sorted, non-overlapping list of fetched ranges.
+  let loadedRanges: Range[] = [];
+
+  let throttleTimer: ReturnType<typeof setTimeout> | undefined;
+  let pendingStart = 0;
+  let pendingEnd = 0;
+  let hasFetchedOnce = false;
+
+  // Sorted array derived from the map. The O(n log n) sort only runs when
+  // slotMap is reassigned, which happens on fetch completion — not per frame.
+  const data: TimeSlot[] = $derived(
+    [...slotMap.values()].sort((a, b) => a.time.getTime() - b.time.getTime())
+  );
+
+  async function fetchGaps(start: number, end: number): Promise<void> {
+    const gaps = findGaps(start, end, loadedRanges);
+    if (gaps.length === 0) return;
+
+    // Fetch all gap segments in parallel.
+    const results = await Promise.all(gaps.map(([gs, ge]) => mockFetch(gs, ge)));
+
+    // Merge results into the slot map.
+    const next = new Map(slotMap);
+    for (const slots of results) {
+      for (const slot of slots) {
+        next.set(slot.time.getTime(), slot);
+      }
+    }
+
+    // Update loaded-range bookkeeping.
+    for (const gap of gaps) {
+      loadedRanges = mergeRange(loadedRanges, gap);
+    }
+
+    // Single reactive assignment.
+    slotMap = next;
+  }
+
+  /**
+   * Notify the store that the viewport now covers [viewStart, viewEnd] (ms).
+   * Automatically buffers by 15 % each side and throttles fetches.
+   *
+   * The first call fetches immediately. Subsequent calls update the pending
+   * range but don't reset an existing timer, so continuous view changes
+   * (follow mode, momentum pan) don't starve the fetch.
+   */
+  function requestRange(viewStart: number, viewEnd: number): void {
+    const span = viewEnd - viewStart;
+    const buffer = span * BUFFER_RATIO;
+    pendingStart = viewStart - buffer;
+    pendingEnd = viewEnd + buffer;
+
+    if (!hasFetchedOnce) {
+      hasFetchedOnce = true;
+      fetchGaps(pendingStart, pendingEnd);
+      return;
+    }
+
+    if (throttleTimer === undefined) {
+      throttleTimer = setTimeout(() => {
+        throttleTimer = undefined;
+        fetchGaps(pendingStart, pendingEnd);
+      }, FETCH_THROTTLE_MS);
+    }
+  }
+
+  /** Clean up the throttle timer (call on component destroy). */
+  function dispose(): void {
+    clearTimeout(throttleTimer);
+  }
+
+  return {
+    get data() {
+      return data;
+    },
+    requestRange,
+    dispose,
+  };
+}
@@ -0,0 +1,36 @@
+/**
+ * Shared types for the timeline feature.
+ */
+import type { ScaleLinear, ScaleTime } from "d3-scale";
+
+import type { Subject } from "./data";
+
+export type { Subject };
+
+/** A single 15-minute time slot with per-subject class counts. */
+export interface TimeSlot {
+  time: Date;
+  subjects: Record<Subject, number>;
+}
+
+/** Lerped animation entry for a single subject within a slot. */
+export interface AnimEntry {
+  current: number;
+  target: number;
+}
+
+/**
+ * Shared context passed to all canvas rendering functions.
+ * Computed once per frame in the orchestrator and threaded through.
+ */
+export interface ChartContext {
+  ctx: CanvasRenderingContext2D;
+  xScale: ScaleTime<number, number>;
+  yScale: ScaleLinear<number, number>;
+  width: number;
+  chartTop: number;
+  chartBottom: number;
+  viewSpan: number;
+  viewStart: number;
+  viewEnd: number;
+}
@@ -0,0 +1,92 @@
+/**
+ * Pure viewport utility functions: binary search, visible-slot slicing,
+ * hit-testing, and snapping for the timeline canvas.
+ */
+import { SLOT_INTERVAL_MS, RENDER_MARGIN_SLOTS } from "./constants";
+import { SUBJECTS, type Subject } from "./data";
+import type { TimeSlot } from "./types";
+
+/**
+ * Binary-search for the index of the first slot whose time >= target.
+ * `slots` must be sorted ascending by time.
+ */
+export function lowerBound(slots: TimeSlot[], targetMs: number): number {
+  let lo = 0;
+  let hi = slots.length;
+  while (lo < hi) {
+    const mid = (lo + hi) >>> 1;
+    if (slots[mid].time.getTime() < targetMs) lo = mid + 1;
+    else hi = mid;
+  }
+  return lo;
+}
+
+/**
+ * Return the sub-array of `data` covering the viewport [viewStart, viewEnd]
+ * plus a small margin for smooth curve edges.
+ */
+export function getVisibleSlots(data: TimeSlot[], viewStart: number, viewEnd: number): TimeSlot[] {
+  if (data.length === 0) return data;
+  const lo = Math.max(0, lowerBound(data, viewStart) - RENDER_MARGIN_SLOTS);
+  const hi = Math.min(data.length, lowerBound(data, viewEnd) + RENDER_MARGIN_SLOTS);
+  return data.slice(lo, hi);
+}
+
+/** Find the slot closest to `timeMs`, or null if none within one interval. */
+export function findSlotByTime(data: TimeSlot[], timeMs: number): TimeSlot | null {
+  if (data.length === 0) return null;
+  const idx = lowerBound(data, timeMs);
+  let best: TimeSlot | null = null;
+  let bestDist = Infinity;
+  for (const i of [idx - 1, idx]) {
+    if (i < 0 || i >= data.length) continue;
+    const dist = Math.abs(data[i].time.getTime() - timeMs);
+    if (dist < bestDist) {
+      bestDist = dist;
+      best = data[i];
+    }
+  }
+  if (best && bestDist < SLOT_INTERVAL_MS) return best;
+  return null;
+}
+
+/** Snap a timestamp down to the nearest 15-minute slot boundary. */
+export function snapToSlot(timeMs: number): number {
+  return Math.floor(timeMs / SLOT_INTERVAL_MS) * SLOT_INTERVAL_MS;
+}
+
+/** Sum of class counts for enabled subjects in a slot. */
+export function enabledTotalClasses(slot: TimeSlot, activeSubjects: readonly Subject[]): number {
+  let sum = 0;
+  for (const s of activeSubjects) {
+    sum += slot.subjects[s] || 0;
+  }
+  return sum;
+}
+
+/**
+ * Determine which subjects to include in the stack: all enabled subjects
+ * plus any disabled subjects still animating out (current > threshold).
+ */
+export function getStackSubjects(
+  visible: TimeSlot[],
+  enabledSubjects: Set<Subject>,
+  animMap: Map<number, Map<string, { current: number }>>,
+  settleThreshold: number
+): Subject[] {
+  const subjects: Subject[] = [];
+  for (const subject of SUBJECTS) {
+    if (enabledSubjects.has(subject)) {
+      subjects.push(subject);
+      continue;
+    }
+    for (const slot of visible) {
+      const entry = animMap.get(slot.time.getTime())?.get(subject);
+      if (entry && Math.abs(entry.current) > settleThreshold) {
+        subjects.push(subject);
+        break;
+      }
+    }
+  }
+  return subjects;
+}
@@ -4,3 +4,30 @@ import { twMerge } from "tailwind-merge";
 export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
 }
+
+/** Shared tooltip content styling for bits-ui Tooltip.Content */
+export const tooltipContentClass =
+  "z-50 bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-md max-w-72";
+
+export interface FormatNumberOptions {
+  /** Include sign for positive numbers (default: false) */
+  sign?: boolean;
+  /** Maximum fraction digits (default: 0 for integers) */
+  maximumFractionDigits?: number;
+}
+
+/**
+ * Format a number with locale-aware thousands separators.
+ * Uses browser locale via Intl.NumberFormat.
+ */
+export function formatNumber(num: number, options: FormatNumberOptions = {}): string {
+  const { sign = false, maximumFractionDigits = 0 } = options;
+  const formatted = new Intl.NumberFormat(undefined, {
+    maximumFractionDigits,
+  }).format(num);
+
+  if (sign && num >= 0) {
+    return `+${formatted}`;
+  }
+  return formatted;
+}
@@ -0,0 +1,210 @@
+import type { ScrapeJob } from "$lib/api";
+
+export type ScrapeJobStatus = "processing" | "staleLock" | "exhausted" | "scheduled" | "pending";
+
+export type ScrapeJobEvent =
+  | { type: "init"; jobs: ScrapeJob[] }
+  | { type: "jobCreated"; job: ScrapeJob }
+  | { type: "jobLocked"; id: number; lockedAt: string; status: ScrapeJobStatus }
+  | { type: "jobCompleted"; id: number }
+  | {
+      type: "jobRetried";
+      id: number;
+      retryCount: number;
+      queuedAt: string;
+      status: ScrapeJobStatus;
+    }
+  | { type: "jobExhausted"; id: number }
+  | { type: "jobDeleted"; id: number };
+
+export type ConnectionState = "connected" | "reconnecting" | "disconnected";
+
+const PRIORITY_ORDER: Record<string, number> = {
+  critical: 0,
+  high: 1,
+  medium: 2,
+  low: 3,
+};
+
+const MAX_RECONNECT_DELAY = 30_000;
+const MAX_RECONNECT_ATTEMPTS = 10;
+
+function sortJobs(jobs: Iterable<ScrapeJob>): ScrapeJob[] {
+  return Array.from(jobs).sort((a, b) => {
+    const pa = PRIORITY_ORDER[a.priority.toLowerCase()] ?? 2;
+    const pb = PRIORITY_ORDER[b.priority.toLowerCase()] ?? 2;
+    if (pa !== pb) return pa - pb;
+    return new Date(a.executeAt).getTime() - new Date(b.executeAt).getTime();
+  });
+}
+
+export class ScrapeJobsStore {
+  private ws: WebSocket | null = null;
+  private jobs = new Map<number, ScrapeJob>();
+  private _connectionState: ConnectionState = "disconnected";
+  private _initialized = false;
+  private onUpdate: () => void;
+  private reconnectAttempts = 0;
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null;
+  private intentionalClose = false;
+
+  /** Cached sorted array, invalidated on data mutations. */
+  private cachedJobs: ScrapeJob[] = [];
+  private cacheDirty = false;
+
+  constructor(onUpdate: () => void) {
+    this.onUpdate = onUpdate;
+  }
+
+  getJobs(): ScrapeJob[] {
+    if (this.cacheDirty) {
+      this.cachedJobs = sortJobs(this.jobs.values());
+      this.cacheDirty = false;
+    }
+    return this.cachedJobs;
+  }
+
+  getConnectionState(): ConnectionState {
+    return this._connectionState;
+  }
+
+  isInitialized(): boolean {
+    return this._initialized;
+  }
+
+  connect(): void {
+    this.intentionalClose = false;
+    const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
+    const url = `${protocol}//${window.location.host}/api/admin/scrape-jobs/ws`;
+
+    try {
+      this.ws = new WebSocket(url);
+    } catch {
+      this.scheduleReconnect();
+      return;
+    }
+
+    this.ws.onopen = () => {
+      this._connectionState = "connected";
+      this.reconnectAttempts = 0;
+      this.onUpdate();
+    };
+
+    this.ws.onmessage = (event) => {
+      try {
+        const parsed = JSON.parse(event.data as string) as ScrapeJobEvent;
+        this.handleEvent(parsed);
+      } catch {
+        // Ignore malformed messages
+      }
+    };
+
+    this.ws.onclose = () => {
+      this.ws = null;
+      if (!this.intentionalClose) {
+        this.scheduleReconnect();
+      }
+    };
+
+    this.ws.onerror = () => {
+      // onclose will fire after onerror, so reconnect is handled there
+    };
+  }
+
+  handleEvent(event: ScrapeJobEvent): void {
+    switch (event.type) {
+      case "init":
+        this.jobs.clear();
+        for (const job of event.jobs) {
+          this.jobs.set(job.id, job);
+        }
+        this._initialized = true;
+        break;
+      case "jobCreated":
+        this.jobs.set(event.job.id, event.job);
+        break;
+      case "jobLocked": {
+        const job = this.jobs.get(event.id);
+        if (job) {
+          this.jobs.set(event.id, { ...job, lockedAt: event.lockedAt, status: event.status });
+        }
+        break;
+      }
+      case "jobCompleted":
+        this.jobs.delete(event.id);
+        break;
+      case "jobRetried": {
+        const job = this.jobs.get(event.id);
+        if (job) {
+          this.jobs.set(event.id, {
+            ...job,
+            retryCount: event.retryCount,
+            queuedAt: event.queuedAt,
+            status: event.status,
+            lockedAt: null,
+          });
+        }
+        break;
+      }
+      case "jobExhausted": {
+        const job = this.jobs.get(event.id);
+        if (job) {
+          this.jobs.set(event.id, { ...job, status: "exhausted" });
+        }
+        break;
+      }
+      case "jobDeleted":
+        this.jobs.delete(event.id);
+        break;
+    }
+    this.cacheDirty = true;
+    this.onUpdate();
+  }
+
+  disconnect(): void {
+    this.intentionalClose = true;
+    if (this.reconnectTimer !== null) {
+      clearTimeout(this.reconnectTimer);
+      this.reconnectTimer = null;
+    }
+    if (this.ws) {
+      this.ws.close();
+      this.ws = null;
+    }
+    this._connectionState = "disconnected";
+    this.onUpdate();
+  }
+
+  resync(): void {
+    if (this.ws && this.ws.readyState === WebSocket.OPEN) {
+      this.ws.send(JSON.stringify({ type: "resync" }));
+    }
+  }
+
+  /** Attempt to reconnect after being disconnected. Resets attempt counter. */
+  retry(): void {
+    this.reconnectAttempts = 0;
+    this._connectionState = "reconnecting";
+    this.onUpdate();
+    this.connect();
+  }
+
+  private scheduleReconnect(): void {
+    if (this.reconnectAttempts >= MAX_RECONNECT_ATTEMPTS) {
+      this._connectionState = "disconnected";
+      this.onUpdate();
+      return;
+    }
+
+    this._connectionState = "reconnecting";
+    this.onUpdate();
+
+    const delay = Math.min(1000 * 2 ** this.reconnectAttempts, MAX_RECONNECT_DELAY);
+    this.reconnectAttempts++;
+
+    this.reconnectTimer = setTimeout(() => {
+      this.reconnectTimer = null;
+      this.connect();
+    }, delay);
+  }
+}
@@ -0,0 +1,155 @@
+<script lang="ts">
+import { goto } from "$app/navigation";
+import { page } from "$app/state";
+import { authStore } from "$lib/auth.svelte";
+import PageTransition from "$lib/components/PageTransition.svelte";
+import ErrorBoundaryFallback from "$lib/components/ErrorBoundaryFallback.svelte";
+import {
+  ClipboardList,
+  FileText,
+  GraduationCap,
+  LayoutDashboard,
+  LogOut,
+  Settings,
+  User,
+  Users,
+} from "@lucide/svelte";
+import { onMount, tick } from "svelte";
+
+let { children } = $props();
+
+// Track boundary reset function so navigation can auto-clear errors
+let boundaryReset = $state<(() => void) | null>(null);
+let errorPathname = $state<string | null>(null);
+
+function onBoundaryError(e: unknown, reset: () => void) {
+  console.error("[page boundary]", e);
+  boundaryReset = reset;
+  errorPathname = page.url.pathname;
+}
+
+// Auto-reset the boundary only when the user navigates away from the errored page
+$effect(() => {
+  const currentPath = page.url.pathname;
+
+  if (boundaryReset && errorPathname && currentPath !== errorPathname) {
+    const reset = boundaryReset;
+    boundaryReset = null;
+    errorPathname = null;
+    tick().then(() => reset());
+  }
+});
+
+onMount(async () => {
+  if (authStore.isLoading) {
+    await authStore.init();
+  }
+});
+
+$effect(() => {
+  if (authStore.state.mode === "unauthenticated") {
+    goto("/login");
+  }
+});
+
+const userItems = [
+  { href: "/profile", label: "Profile", icon: User },
+  { href: "/settings", label: "Settings", icon: Settings },
+];
+
+const adminItems = [
+  { href: "/admin", label: "Dashboard", icon: LayoutDashboard },
+  { href: "/admin/jobs", label: "Scrape Jobs", icon: ClipboardList },
+  { href: "/admin/audit", label: "Audit Log", icon: FileText },
+  { href: "/admin/users", label: "Users", icon: Users },
+  { href: "/admin/instructors", label: "Instructors", icon: GraduationCap },
+];
+
+function isActive(href: string): boolean {
+  if (href === "/admin") return page.url.pathname === "/admin";
+  return page.url.pathname.startsWith(href);
+}
+</script>
+
+{#if authStore.isLoading}
+  <div class="flex flex-col items-center px-5 pb-5 pt-20">
+    <div class="w-full max-w-6xl">
+      <p class="text-muted-foreground py-12 text-center text-sm">Loading...</p>
+    </div>
+  </div>
+{:else if !authStore.isAuthenticated}
+  <div class="flex flex-col items-center px-5 pb-5 pt-20">
+    <div class="w-full max-w-6xl">
+      <p class="text-muted-foreground py-12 text-center text-sm">Redirecting to login...</p>
+    </div>
+  </div>
+{:else}
+  <div class="flex flex-col items-center px-5 pb-5 pt-20">
+    <div class="w-full max-w-6xl flex gap-8">
+      <!-- Inline sidebar -->
+      <aside class="w-48 shrink-0 pt-1">
+        {#if authStore.user}
+          <div class="mb-4 px-2">
+            <p class="text-sm font-medium text-foreground">{authStore.user.discordUsername}</p>
+          </div>
+        {/if}
+
+        <nav class="flex flex-col gap-0.5">
+          <span class="px-2 text-[11px] font-medium uppercase tracking-wider text-muted-foreground/60 mb-0.5">User</span>
+          {#each userItems as item}
+            <a
+              href={item.href}
+              class="flex items-center gap-2 rounded-md px-2 py-1.5 text-sm no-underline transition-colors
+                {isActive(item.href)
+                  ? 'text-foreground bg-muted font-medium'
+                  : 'text-muted-foreground hover:text-foreground hover:bg-muted/50'}"
+            >
+              <item.icon size={15} strokeWidth={2} />
+              {item.label}
+            </a>
+          {/each}
+
+          {#if authStore.isAdmin}
+            <div class="my-2 mx-2 border-t border-border"></div>
+            <span class="px-2 text-[11px] font-medium uppercase tracking-wider text-muted-foreground/60 mb-0.5">Admin</span>
+            {#each adminItems as item}
+              <a
+                href={item.href}
+                class="flex items-center gap-2 rounded-md px-2 py-1.5 text-sm no-underline transition-colors
+                  {isActive(item.href)
+                    ? 'text-foreground bg-muted font-medium'
+                    : 'text-muted-foreground hover:text-foreground hover:bg-muted/50'}"
+              >
+                <item.icon size={15} strokeWidth={2} />
+                {item.label}
+              </a>
+            {/each}
+          {/if}
+
+          <div class="my-2 mx-2 border-t border-border"></div>
+          <button
+            onclick={() => authStore.logout()}
+            class="flex items-center gap-2 rounded-md px-2 py-1.5 text-sm cursor-pointer
+              bg-transparent border-none text-muted-foreground hover:text-foreground hover:bg-muted/50 transition-colors"
+          >
+            <LogOut size={15} strokeWidth={2} />
+            Sign Out
+          </button>
+        </nav>
+      </aside>
+
+      <!-- Content -->
+      <main class="flex-1 min-w-0">
+        <svelte:boundary onerror={onBoundaryError}>
+          <PageTransition key={page.url.pathname} axis="vertical">
+            {@render children()}
+          </PageTransition>
+
+          {#snippet failed(error, reset)}
+            <ErrorBoundaryFallback title="Page error" {error} {reset} />
+          {/snippet}
+        </svelte:boundary>
+      </main>
+    </div>
+  </div>
+{/if}
@@ -0,0 +1,55 @@
+<script lang="ts">
+import { onMount } from "svelte";
+import { client, type AdminStatus } from "$lib/api";
+import { formatNumber } from "$lib/utils";
+
+let status = $state<AdminStatus | null>(null);
+let error = $state<string | null>(null);
+
+onMount(async () => {
+  try {
+    status = await client.getAdminStatus();
+  } catch (e) {
+    error = e instanceof Error ? e.message : "Failed to load status";
+  }
+});
+</script>
+
+<h1 class="mb-4 text-lg font-semibold text-foreground">Dashboard</h1>
+
+{#if error}
+  <p class="text-destructive">{error}</p>
+{:else if !status}
+  <p class="text-muted-foreground">Loading...</p>
+{:else}
+  <div class="grid grid-cols-2 gap-4 lg:grid-cols-4">
+    <div class="bg-card border-border rounded-lg border p-4">
+      <p class="text-muted-foreground text-sm">Users</p>
+      <p class="text-3xl font-bold">{formatNumber(status.userCount)}</p>
+    </div>
+    <div class="bg-card border-border rounded-lg border p-4">
+      <p class="text-muted-foreground text-sm">Active Sessions</p>
+      <p class="text-3xl font-bold">{formatNumber(status.sessionCount)}</p>
+    </div>
+    <div class="bg-card border-border rounded-lg border p-4">
+      <p class="text-muted-foreground text-sm">Courses</p>
+      <p class="text-3xl font-bold">{formatNumber(status.courseCount)}</p>
+    </div>
+    <div class="bg-card border-border rounded-lg border p-4">
+      <p class="text-muted-foreground text-sm">Scrape Jobs</p>
+      <p class="text-3xl font-bold">{formatNumber(status.scrapeJobCount)}</p>
+    </div>
+  </div>
+
+  <h2 class="mt-6 mb-3 text-sm font-semibold text-foreground">Services</h2>
+  <div class="bg-card border-border rounded-lg border">
+    {#each status.services as service}
+      <div class="border-border flex items-center justify-between border-b px-4 py-3 last:border-b-0">
+        <span class="font-medium">{service.name}</span>
+        <span class="rounded-full bg-green-100 px-2 py-0.5 text-xs font-medium text-green-800 dark:bg-green-900 dark:text-green-200">
+          {service.status}
+        </span>
+      </div>
+    {/each}
+  </div>
+{/if}
@@ -0,0 +1,422 @@
+<script module lang="ts">
+import type { AuditLogResponse } from "$lib/api";
+
+// Persisted across navigation so returning to the page shows cached data
+// instead of a skeleton loader. Timers are instance-scoped and restart on mount.
+let data = $state<AuditLogResponse | null>(null);
+let error = $state<string | null>(null);
+let refreshError = $state(false);
+let refreshInterval = 5_000;
+</script>
+
+<script lang="ts">
+import { type AuditLogEntry, client } from "$lib/api";
+import SimpleTooltip from "$lib/components/SimpleTooltip.svelte";
+import { FlexRender, createSvelteTable } from "$lib/components/ui/data-table/index.js";
+import { formatAbsoluteDate } from "$lib/date";
+import { type DiffEntry, formatDiffPath, jsonDiff, tryParseJson } from "$lib/diff";
+import { relativeTime } from "$lib/time";
+import { formatNumber } from "$lib/utils";
+import {
+  AlertCircle,
+  ArrowDown,
+  ArrowUp,
+  ArrowUpDown,
+  ChevronDown,
+  ChevronRight,
+  LoaderCircle,
+} from "@lucide/svelte";
+import {
+  type ColumnDef,
+  type SortingState,
+  type Updater,
+  getCoreRowModel,
+  getSortedRowModel,
+} from "@tanstack/table-core";
+import { onDestroy, onMount } from "svelte";
+import { fade, slide } from "svelte/transition";
+
+let expandedId: number | null = $state(null);
+
+// --- Live-updating clock for relative timestamps ---
+let now = $state(new Date());
+let tickTimer: ReturnType<typeof setTimeout> | undefined;
+
+function scheduleTick() {
+  tickTimer = setTimeout(() => {
+    now = new Date();
+    scheduleTick();
+  }, 1000);
+}
+
+// --- Auto-refresh with backoff ---
+// Backoff increases on errors AND on 304 (no change). Resets to min on new data.
+const MIN_INTERVAL = 5_000;
+const MAX_INTERVAL = 60_000;
+let refreshTimer: ReturnType<typeof setTimeout> | undefined;
+
+// Spinner stays visible for at least MIN_SPIN_MS so the animation isn't jarring.
+const MIN_SPIN_MS = 700;
+let spinnerVisible = $state(false);
+let spinHoldTimer: ReturnType<typeof setTimeout> | undefined;
+
+async function fetchData() {
+  refreshError = false;
+  spinnerVisible = true;
+  clearTimeout(spinHoldTimer);
+  const startedAt = performance.now();
+
+  try {
+    const result = await client.getAdminAuditLog();
+    if (result === null) {
+      refreshInterval = Math.min(refreshInterval * 2, MAX_INTERVAL);
+    } else {
+      data = result;
+      error = null;
+      refreshInterval = MIN_INTERVAL;
+    }
+  } catch (e) {
+    error = e instanceof Error ? e.message : "Failed to load audit log";
+    refreshError = true;
+    refreshInterval = Math.min(refreshInterval * 2, MAX_INTERVAL);
+  } finally {
+    const elapsed = performance.now() - startedAt;
+    const remaining = MIN_SPIN_MS - elapsed;
+    if (remaining > 0) {
+      spinHoldTimer = setTimeout(() => {
+        spinnerVisible = false;
+      }, remaining);
+    } else {
+      spinnerVisible = false;
+    }
+    scheduleRefresh();
+  }
+}
+
+function scheduleRefresh() {
+  clearTimeout(refreshTimer);
+  refreshTimer = setTimeout(fetchData, refreshInterval);
+}
+
+onMount(() => {
+  fetchData();
+  scheduleTick();
+});
+
+onDestroy(() => {
+  clearTimeout(tickTimer);
+  clearTimeout(refreshTimer);
+  clearTimeout(spinHoldTimer);
+});
+
+// --- Change column helpers ---
+
+interface ChangeAnalysis {
+  kind: "scalar" | "json-single" | "json-multi";
+  oldRaw: string;
+  newRaw: string;
+  diffs: DiffEntry[];
+  delta: number | null;
+}
+
+function analyzeChange(entry: AuditLogEntry): ChangeAnalysis {
+  const parsedOld = tryParseJson(entry.oldValue);
+  const parsedNew = tryParseJson(entry.newValue);
+
+  const isJsonOld = typeof parsedOld === "object" && parsedOld !== null;
+  const isJsonNew = typeof parsedNew === "object" && parsedNew !== null;
+
+  if (isJsonOld && isJsonNew) {
+    const diffs = jsonDiff(parsedOld, parsedNew);
+    const kind = diffs.length <= 1 ? "json-single" : "json-multi";
+    return { kind, oldRaw: entry.oldValue, newRaw: entry.newValue, diffs, delta: null };
+  }
+
+  let delta: number | null = null;
+  const numOld = Number(entry.oldValue);
+  const numNew = Number(entry.newValue);
+  if (
+    !Number.isNaN(numOld) &&
+    !Number.isNaN(numNew) &&
+    entry.oldValue !== "" &&
+    entry.newValue !== ""
+  ) {
+    delta = numNew - numOld;
+  }
+
+  return { kind: "scalar", oldRaw: entry.oldValue, newRaw: entry.newValue, diffs: [], delta };
+}
+
+
+
+function stringify(val: unknown): string {
+  if (val === undefined) return "∅";
+  if (typeof val === "string") return val;
+  return JSON.stringify(val);
+}
+
+function toggleExpanded(id: number) {
+  expandedId = expandedId === id ? null : id;
+}
+
+function formatCourse(entry: AuditLogEntry): string {
+  if (entry.subject && entry.courseNumber) {
+    return `${entry.subject} ${entry.courseNumber}`;
+  }
+  return `#${entry.courseId}`;
+}
+
+function formatCourseTooltip(entry: AuditLogEntry): string {
+  const parts: string[] = [];
+  if (entry.courseTitle) parts.push(entry.courseTitle);
+  if (entry.crn) parts.push(`CRN ${entry.crn}`);
+  parts.push(`ID ${entry.courseId}`);
+  return parts.join("\n");
+}
+
+// --- TanStack Table ---
+
+let sorting: SortingState = $state([{ id: "time", desc: true }]);
+
+function handleSortingChange(updater: Updater<SortingState>) {
+  sorting = typeof updater === "function" ? updater(sorting) : updater;
+}
+
+const columns: ColumnDef<AuditLogEntry, unknown>[] = [
+  {
+    id: "time",
+    accessorKey: "timestamp",
+    header: "Time",
+    enableSorting: true,
+  },
+  {
+    id: "course",
+    accessorKey: "courseId",
+    header: "Course",
+    enableSorting: false,
+  },
+  {
+    id: "field",
+    accessorKey: "fieldChanged",
+    header: "Field",
+    enableSorting: true,
+  },
+  {
+    id: "change",
+    accessorFn: () => "",
+    header: "Change",
+    enableSorting: false,
+  },
+];
+
+const table = createSvelteTable({
+  get data() {
+    return data?.entries ?? [];
+  },
+  getRowId: (row) => String(row.id),
+  columns,
+  state: {
+    get sorting() {
+      return sorting;
+    },
+  },
+  onSortingChange: handleSortingChange,
+  getCoreRowModel: getCoreRowModel(),
+  getSortedRowModel: getSortedRowModel<AuditLogEntry>(),
+  enableSortingRemoval: true,
+});
+
+const skeletonWidths: Record<string, string> = {
+  time: "w-24",
+  course: "w-20",
+  field: "w-20",
+  change: "w-40",
+};
+
+const columnCount = columns.length;
+</script>
+
+<div class="mb-4 flex items-center gap-2">
+  <h1 class="text-lg font-semibold text-foreground">Audit Log</h1>
+  {#if spinnerVisible}
+    <span in:fade={{ duration: 150 }} out:fade={{ duration: 200 }}>
+      <LoaderCircle class="size-4 animate-spin text-muted-foreground" />
+    </span>
+  {:else if refreshError}
+    <span in:fade={{ duration: 150 }} out:fade={{ duration: 200 }}>
+      <SimpleTooltip text={error ?? "Refresh failed"} side="right" passthrough>
+        <AlertCircle class="size-4 text-destructive" />
+      </SimpleTooltip>
+    </span>
+  {/if}
+</div>
+
+{#if error && !data}
+  <p class="text-destructive">{error}</p>
+{:else}
+  <div class="bg-card border-border overflow-hidden rounded-lg border">
+    <table class="w-full text-sm">
+      <thead>
+        {#each table.getHeaderGroups() as headerGroup}
+          <tr class="border-b border-border text-left text-muted-foreground">
+            {#each headerGroup.headers as header}
+              <th
+                class="px-4 py-3 font-medium"
+                class:cursor-pointer={header.column.getCanSort()}
+                class:select-none={header.column.getCanSort()}
+                onclick={header.column.getToggleSortingHandler()}
+              >
+                {#if header.column.getCanSort()}
+                  <span class="inline-flex items-center gap-1">
+                    {#if typeof header.column.columnDef.header === "string"}
+                      {header.column.columnDef.header}
+                    {:else}
+                      <FlexRender
+                        content={header.column.columnDef.header}
+                        context={header.getContext()}
+                      />
+                    {/if}
+                    {#if header.column.getIsSorted() === "asc"}
+                      <ArrowUp class="size-3.5" />
+                    {:else if header.column.getIsSorted() === "desc"}
+                      <ArrowDown class="size-3.5" />
+                    {:else}
+                      <ArrowUpDown class="size-3.5 text-muted-foreground/40" />
+                    {/if}
+                  </span>
+                {:else if typeof header.column.columnDef.header === "string"}
+                  {header.column.columnDef.header}
+                {:else}
+                  <FlexRender
+                    content={header.column.columnDef.header}
+                    context={header.getContext()}
+                  />
+                {/if}
+              </th>
+            {/each}
+          </tr>
+        {/each}
+      </thead>
+      <tbody>
+        {#if !data}
+          <!-- Skeleton loading -->
+          {#each Array(20) as _}
+            <tr class="border-b border-border">
+              {#each columns as col}
+                <td class="px-4 py-3">
+                  <div
+                    class="h-4 rounded bg-muted animate-pulse {skeletonWidths[col.id ?? ''] ?? 'w-20'}"
+                  ></div>
+                </td>
+              {/each}
+            </tr>
+          {/each}
+        {:else if data.entries.length === 0}
+          <tr>
+            <td colspan={columnCount} class="px-4 py-12 text-center text-muted-foreground">
+              No audit log entries found.
+            </td>
+          </tr>
+        {:else}
+          {#each table.getRowModel().rows as row (row.id)}
+            {@const entry = row.original}
+            {@const change = analyzeChange(entry)}
+            {@const isExpanded = expandedId === entry.id}
+            {@const clickable = change.kind === "json-multi"}
+            <tr
+              class="border-b border-border transition-colors last:border-b-0
+                {clickable ? 'cursor-pointer hover:bg-muted/50' : ''}
+                {isExpanded ? 'bg-muted/30' : ''}"
+              onclick={clickable ? () => toggleExpanded(entry.id) : undefined}
+            >
+              {#each row.getVisibleCells() as cell (cell.id)}
+                {@const colId = cell.column.id}
+                {#if colId === "time"}
+                  {@const rel = relativeTime(new Date(entry.timestamp), now)}
+                  <td class="px-4 py-3 whitespace-nowrap">
+                    <SimpleTooltip text={formatAbsoluteDate(entry.timestamp)} side="right" passthrough>
+                      <span class="font-mono text-xs text-muted-foreground">{rel.text === "now" ? "just now" : `${rel.text} ago`}</span>
+                    </SimpleTooltip>
+                  </td>
+                {:else if colId === "course"}
+                  <td class="px-4 py-3 whitespace-nowrap">
+                    <SimpleTooltip text={formatCourseTooltip(entry)} side="right" passthrough>
+                      <span class="font-mono text-xs text-foreground">{formatCourse(entry)}</span>
+                    </SimpleTooltip>
+                  </td>
+                {:else if colId === "field"}
+                  <td class="px-4 py-3">
+                    <span
+                      class="inline-block rounded-full bg-muted px-2 py-0.5 font-mono text-xs text-muted-foreground"
+                    >
+                      {entry.fieldChanged}
+                    </span>
+                  </td>
+                {:else if colId === "change"}
+                  <td class="px-4 py-3">
+                    {#if change.kind === "scalar"}
+                      <span class="inline-flex items-center gap-1.5 text-sm">
+                        {#if change.delta !== null}
+                          <span class="text-foreground">{formatNumber(change.delta, { sign: true })}<span class="text-muted-foreground/60">,</span></span>
+                        {/if}
+                        <span class="text-red-400">{change.oldRaw}</span>
+                        <span class="text-muted-foreground/60">→</span>
+                        <span class="text-green-600 dark:text-green-400">{change.newRaw}</span>
+                      </span>
+                    {:else if change.kind === "json-single"}
+                      {#if change.diffs.length === 1}
+                        {@const d = change.diffs[0]}
+                        <span class="font-mono text-xs">
+                          <span class="text-muted-foreground">{formatDiffPath(d.path)}:</span>
+                          {" "}
+                          <span class="text-red-400">{stringify(d.oldVal)}</span>
+                          <span class="text-muted-foreground"> → </span>
+                          <span class="text-green-600 dark:text-green-400">{stringify(d.newVal)}</span>
+                        </span>
+                      {:else}
+                        <span class="text-muted-foreground text-xs italic">No changes</span>
+                      {/if}
+                    {:else if change.kind === "json-multi"}
+                      <span class="inline-flex items-center gap-1.5 text-sm text-muted-foreground">
+                        {#if isExpanded}
+                          <ChevronDown class="size-3.5 shrink-0" />
+                        {:else}
+                          <ChevronRight class="size-3.5 shrink-0" />
+                        {/if}
+                        <span class="underline decoration-dotted underline-offset-2">
+                          {formatNumber(change.diffs.length)} fields changed
+                        </span>
+                      </span>
+                    {/if}
+                  </td>
+                {/if}
+              {/each}
+            </tr>
+            <!-- Expandable detail row for multi-path JSON diffs -->
+            {#if isExpanded && change.kind === "json-multi"}
+              <tr class="border-b border-border last:border-b-0">
+                <td colspan={columnCount} class="p-0">
+                  <div transition:slide={{ duration: 200 }}>
+                    <div class="bg-muted/20 px-4 py-3">
+                      <div class="space-y-1.5">
+                        {#each change.diffs as d}
+                          <div class="font-mono text-xs">
+                            <span class="text-muted-foreground">{formatDiffPath(d.path)}:</span>
+                            {" "}
+                            <span class="text-red-400">{stringify(d.oldVal)}</span>
+                            <span class="text-muted-foreground"> → </span>
+                            <span class="text-green-600 dark:text-green-400">{stringify(d.newVal)}</span>
+                          </div>
+                        {/each}
+                      </div>
+                    </div>
+                  </div>
+                </td>
+              </tr>
+            {/if}
+          {/each}
+        {/if}
+      </tbody>
+    </table>
+  </div>
+{/if}
@@ -0,0 +1,651 @@
+<script lang="ts">
+import { onMount, onDestroy } from "svelte";
+import {
+  client,
+  type InstructorListItem,
+  type InstructorStats,
+  type InstructorDetailResponse,
+  type CandidateResponse,
+} from "$lib/api";
+import { formatInstructorName, isRatingValid, ratingStyle, rmpUrl } from "$lib/course";
+import { themeStore } from "$lib/stores/theme.svelte";
+import {
+  Check,
+  ChevronLeft,
+  ChevronRight,
+  ExternalLink,
+  RefreshCw,
+  X,
+  XCircle,
+} from "@lucide/svelte";
+
+// --- State ---
+let instructors = $state<InstructorListItem[]>([]);
+let stats = $state<InstructorStats>({
+  total: 0,
+  unmatched: 0,
+  auto: 0,
+  confirmed: 0,
+  rejected: 0,
+  withCandidates: 0,
+});
+let totalCount = $state(0);
+let currentPage = $state(1);
+let perPage = $state(25);
+let activeFilter = $state<string | undefined>(undefined);
+let searchQuery = $state("");
+let searchInput = $state("");
+let error = $state<string | null>(null);
+let loading = $state(true);
+
+// Expanded row detail
+let expandedId = $state<number | null>(null);
+let detail = $state<InstructorDetailResponse | null>(null);
+let detailLoading = $state(false);
+let detailError = $state<string | null>(null);
+
+// Action states
+let actionLoading = $state<string | null>(null);
+let rescoreLoading = $state(false);
+let rescoreResult = $state<string | null>(null);
+
+// Search debounce
+let searchTimeout: ReturnType<typeof setTimeout> | undefined;
+
+const filterOptions = [
+  { label: "All", value: undefined as string | undefined },
+  { label: "Needs Review", value: "unmatched" },
+  { label: "Auto-matched", value: "auto" },
+  { label: "Confirmed", value: "confirmed" },
+  { label: "Rejected", value: "rejected" },
+];
+
+let matchedLegacyIds = $derived(
+  new Set(detail?.currentMatches.map((m: { legacyId: number }) => m.legacyId) ?? [])
+);
+
+let progressDenom = $derived(stats.total || 1);
+let autoPct = $derived((stats.auto / progressDenom) * 100);
+let confirmedPct = $derived((stats.confirmed / progressDenom) * 100);
+let unmatchedPct = $derived((stats.unmatched / progressDenom) * 100);
+
+let totalPages = $derived(Math.max(1, Math.ceil(totalCount / perPage)));
+
+// --- Data fetching ---
+async function fetchInstructors() {
+  loading = true;
+  error = null;
+  try {
+    const res = await client.getAdminInstructors({
+      status: activeFilter,
+      search: searchQuery || undefined,
+      page: currentPage,
+      per_page: perPage,
+    });
+    instructors = res.instructors;
+    totalCount = res.total;
+    stats = res.stats;
+  } catch (e) {
+    error = e instanceof Error ? e.message : "Failed to load instructors";
+  } finally {
+    loading = false;
+  }
+}
+
+async function fetchDetail(id: number) {
+  detailLoading = true;
+  detailError = null;
+  detail = null;
+  try {
+    detail = await client.getAdminInstructor(id);
+  } catch (e) {
+    detailError = e instanceof Error ? e.message : "Failed to load details";
+  } finally {
+    detailLoading = false;
+  }
+}
+
+onMount(() => {
+  fetchInstructors();
+});
+
+onDestroy(() => clearTimeout(searchTimeout));
+
+function setFilter(value: string | undefined) {
+  activeFilter = value;
+  currentPage = 1;
+  expandedId = null;
+  fetchInstructors();
+}
+
+function handleSearch() {
+  clearTimeout(searchTimeout);
+  searchTimeout = setTimeout(() => {
+    searchQuery = searchInput;
+    currentPage = 1;
+    expandedId = null;
+    fetchInstructors();
+  }, 300);
+}
+
+function goToPage(page: number) {
+  if (page < 1 || page > totalPages) return;
+  currentPage = page;
+  expandedId = null;
+  fetchInstructors();
+}
+
+async function toggleExpand(id: number) {
+  if (expandedId === id) {
+    expandedId = null;
+    detail = null;
+    return;
+  }
+  expandedId = id;
+  await fetchDetail(id);
+}
+
+// --- Actions ---
+async function handleMatch(instructorId: number, rmpLegacyId: number) {
+  actionLoading = `match-${rmpLegacyId}`;
+  try {
+    detail = await client.matchInstructor(instructorId, rmpLegacyId);
+    await fetchInstructors();
+  } catch (e) {
+    detailError = e instanceof Error ? e.message : "Match failed";
+  } finally {
+    actionLoading = null;
+  }
+}
+
+async function handleReject(instructorId: number, rmpLegacyId: number) {
+  actionLoading = `reject-${rmpLegacyId}`;
+  try {
+    await client.rejectCandidate(instructorId, rmpLegacyId);
+    await Promise.all([fetchDetail(instructorId), fetchInstructors()]);
+  } catch (e) {
+    detailError = e instanceof Error ? e.message : "Reject failed";
+  } finally {
+    actionLoading = null;
+  }
+}
+
+async function handleRejectAll(instructorId: number) {
+  actionLoading = "reject-all";
+  try {
+    await client.rejectAllCandidates(instructorId);
+    await Promise.all([fetchDetail(instructorId), fetchInstructors()]);
+  } catch (e) {
+    detailError = e instanceof Error ? e.message : "Reject all failed";
+  } finally {
+    actionLoading = null;
+  }
+}
+
+async function handleUnmatch(instructorId: number, rmpLegacyId: number) {
+  actionLoading = `unmatch-${rmpLegacyId}`;
+  try {
+    await client.unmatchInstructor(instructorId, rmpLegacyId);
+    await Promise.all([fetchDetail(instructorId), fetchInstructors()]);
+  } catch (e) {
+    detailError = e instanceof Error ? e.message : "Unmatch failed";
+  } finally {
+    actionLoading = null;
+  }
+}
+
+async function handleRescore() {
+  rescoreLoading = true;
+  rescoreResult = null;
+  try {
+    const res = await client.rescoreInstructors();
+    rescoreResult = `Rescored: ${res.totalUnmatched} unmatched, ${res.candidatesCreated} candidates created, ${res.autoMatched} auto-matched`;
+    await fetchInstructors();
+  } catch (e) {
+    rescoreResult = e instanceof Error ? e.message : "Rescore failed";
+  } finally {
+    rescoreLoading = false;
+  }
+}
+
+// --- Helpers ---
+function statusBadge(status: string): { label: string; classes: string } {
+  switch (status) {
+    case "unmatched":
+      return {
+        label: "Unmatched",
+        classes: "bg-amber-100 text-amber-800 dark:bg-amber-900 dark:text-amber-200",
+      };
+    case "auto":
+      return {
+        label: "Auto",
+        classes: "bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200",
+      };
+    case "confirmed":
+      return {
+        label: "Confirmed",
+        classes: "bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-200",
+      };
+    case "rejected":
+      return {
+        label: "Rejected",
+        classes: "bg-red-100 text-red-800 dark:bg-red-900 dark:text-red-200",
+      };
+    default:
+      return { label: status, classes: "bg-muted text-muted-foreground" };
+  }
+}
+
+function formatScore(score: number): string {
+  return (score * 100).toFixed(0);
+}
+
+const scoreWeights: Record<string, number> = {
+  name: 0.5,
+  department: 0.25,
+  uniqueness: 0.15,
+  volume: 0.1,
+};
+const scoreColors: Record<string, string> = {
+  name: "bg-blue-500",
+  department: "bg-purple-500",
+  uniqueness: "bg-amber-500",
+  volume: "bg-emerald-500",
+};
+const scoreLabels: Record<string, string> = {
+  name: "Name",
+  department: "Dept",
+  uniqueness: "Unique",
+  volume: "Volume",
+};
+</script>
+
+<div class="flex items-center justify-between mb-4">
+  <h1 class="text-lg font-semibold text-foreground">Instructors</h1>
+  <button
+    onclick={handleRescore}
+    disabled={rescoreLoading}
+    class="inline-flex items-center gap-1.5 rounded-md bg-muted px-3 py-1.5 text-sm font-medium text-foreground hover:bg-accent transition-colors disabled:opacity-50 cursor-pointer"
+  >
+    <RefreshCw size={14} class={rescoreLoading ? "animate-spin" : ""} />
+    Rescore
+  </button>
+</div>
+
+{#if rescoreResult}
+  <div class="mb-4 rounded-md bg-muted px-3 py-2 text-sm text-muted-foreground">
+    {rescoreResult}
+  </div>
+{/if}
+
+{#if error}
+  <p class="text-destructive mb-4">{error}</p>
+{/if}
+
+{#if loading && instructors.length === 0}
+  <!-- Skeleton stats cards -->
+  <div class="mb-4 grid grid-cols-5 gap-3">
+    {#each Array(5) as _}
+      <div class="bg-card border-border rounded-lg border p-3">
+        <div class="h-3 w-16 animate-pulse rounded bg-muted mb-2"></div>
+        <div class="h-6 w-12 animate-pulse rounded bg-muted"></div>
+      </div>
+    {/each}
+  </div>
+  <div class="bg-muted mb-6 h-2 rounded-full overflow-hidden"></div>
+  <!-- Skeleton table rows -->
+  <div class="bg-card border-border overflow-hidden rounded-lg border">
+    <div class="divide-y divide-border">
+      {#each Array(8) as _}
+        <div class="flex items-center gap-4 px-4 py-3">
+          <div class="space-y-1.5 flex-1">
+            <div class="h-4 w-40 animate-pulse rounded bg-muted"></div>
+            <div class="h-3 w-28 animate-pulse rounded bg-muted"></div>
+          </div>
+          <div class="h-5 w-20 animate-pulse rounded-full bg-muted"></div>
+          <div class="h-4 w-32 animate-pulse rounded bg-muted"></div>
+          <div class="h-4 w-8 animate-pulse rounded bg-muted"></div>
+          <div class="h-6 w-16 animate-pulse rounded bg-muted"></div>
+        </div>
+      {/each}
+    </div>
+  </div>
+{:else}
+
+<!-- Stats Bar -->
+<div class="mb-4 grid grid-cols-5 gap-3">
+  <div class="bg-card border-border rounded-lg border p-3">
+    <div class="text-muted-foreground text-xs">Total</div>
+    <div class="text-lg font-semibold">{stats.total}</div>
+  </div>
+  <div class="bg-card border-border rounded-lg border p-3">
+    <div class="text-xs text-amber-600 dark:text-amber-400">Unmatched</div>
+    <div class="text-lg font-semibold">{stats.unmatched}</div>
+  </div>
+  <div class="bg-card border-border rounded-lg border p-3">
+    <div class="text-xs text-blue-600 dark:text-blue-400">Auto</div>
+    <div class="text-lg font-semibold">{stats.auto}</div>
+  </div>
+  <div class="bg-card border-border rounded-lg border p-3">
+    <div class="text-xs text-green-600 dark:text-green-400">Confirmed</div>
+    <div class="text-lg font-semibold">{stats.confirmed}</div>
+  </div>
+  <div class="bg-card border-border rounded-lg border p-3">
+    <div class="text-xs text-red-600 dark:text-red-400">Rejected</div>
+    <div class="text-lg font-semibold">{stats.rejected}</div>
+  </div>
+</div>
+
+<!-- Progress Bar -->
+<div class="bg-muted mb-6 h-2 rounded-full overflow-hidden flex">
+  <div class="bg-blue-500 h-full transition-all duration-300"
+       style="width: {autoPct}%" title="Auto: {stats.auto}"></div>
+  <div class="bg-green-500 h-full transition-all duration-300"
+       style="width: {confirmedPct}%" title="Confirmed: {stats.confirmed}"></div>
+  <div class="bg-amber-500 h-full transition-all duration-300"
+       style="width: {unmatchedPct}%" title="Unmatched: {stats.unmatched}"></div>
+</div>
+
+<!-- Filters -->
+<div class="mb-4 flex items-center gap-4">
+  <div class="flex gap-2">
+    {#each filterOptions as opt}
+      <button
+        onclick={() => setFilter(opt.value)}
+        class="rounded-md px-3 py-1.5 text-sm transition-colors cursor-pointer
+          {activeFilter === opt.value
+            ? 'bg-primary text-primary-foreground'
+            : 'bg-muted text-muted-foreground hover:bg-accent'}"
+      >
+        {opt.label}
+      </button>
+    {/each}
+  </div>
+
+  <input
+    type="text"
+    placeholder="Search by name or email..."
+    bind:value={searchInput}
+    oninput={handleSearch}
+    class="bg-card border-border rounded-md border px-3 py-1.5 text-sm text-foreground placeholder:text-muted-foreground outline-none focus:ring-1 focus:ring-ring w-64"
+  />
+</div>
+
+{#if instructors.length === 0}
+  <p class="text-muted-foreground py-8 text-center text-sm">No instructors found.</p>
+{:else}
+  <div class="bg-card border-border overflow-hidden rounded-lg border">
+    <table class="w-full text-sm">
+      <thead>
+        <tr class="border-border border-b text-left text-muted-foreground">
+          <th class="px-4 py-2.5 font-medium">Name</th>
+          <th class="px-4 py-2.5 font-medium">Status</th>
+          <th class="px-4 py-2.5 font-medium">Top Candidate</th>
+          <th class="px-4 py-2.5 font-medium text-center">Candidates</th>
+          <th class="px-4 py-2.5 font-medium text-right">Actions</th>
+        </tr>
+      </thead>
+      <tbody>
+        {#each instructors as instructor (instructor.id)}
+          {@const badge = statusBadge(instructor.rmpMatchStatus)}
+          {@const isExpanded = expandedId === instructor.id}
+          <tr
+            class="border-border border-b cursor-pointer hover:bg-muted/50 transition-colors {isExpanded ? 'bg-muted/30' : ''}"
+            onclick={() => toggleExpand(instructor.id)}
+          >
+            <td class="px-4 py-2.5">
+              <div class="font-medium text-foreground">{formatInstructorName(instructor.displayName)}</div>
+              <div class="text-xs text-muted-foreground">{instructor.email}</div>
+            </td>
+            <td class="px-4 py-2.5">
+              <span class="inline-flex items-center rounded-full px-2 py-0.5 text-xs font-medium {badge.classes}">
+                {badge.label}
+              </span>
+            </td>
+            <td class="px-4 py-2.5">
+              {#if instructor.topCandidate}
+                {@const tc = instructor.topCandidate}
+                <div class="flex items-center gap-2">
+                  <span class="text-foreground">{tc.firstName} {tc.lastName}</span>
+                  {#if isRatingValid(tc.avgRating, tc.numRatings ?? 0)}
+                    <span class="font-semibold tabular-nums" style={ratingStyle(tc.avgRating!, themeStore.isDark)}>
+                      {tc.avgRating!.toFixed(1)}
+                    </span>
+                  {:else}
+                    <span class="text-xs text-muted-foreground">N/A</span>
+                  {/if}
+                  <span class="text-xs text-muted-foreground tabular-nums">
+                    ({formatScore(tc.score ?? 0)}%)
+                  </span>
+                </div>
+              {:else}
+                <span class="text-muted-foreground text-xs">No candidates</span>
+              {/if}
+            </td>
+            <td class="px-4 py-2.5 text-center tabular-nums text-muted-foreground">
+              {instructor.candidateCount}
+            </td>
+            <td class="px-4 py-2.5 text-right">
+              <div class="inline-flex items-center gap-1">
+                {#if instructor.topCandidate && instructor.rmpMatchStatus === "unmatched"}
+                  <button
+                    onclick={(e) => { e.stopPropagation(); handleMatch(instructor.id, instructor.topCandidate!.rmpLegacyId); }}
+                    disabled={actionLoading !== null}
+                    class="rounded p-1 text-green-600 hover:bg-green-100 dark:hover:bg-green-900/30 transition-colors disabled:opacity-50 cursor-pointer"
+                    title="Accept top candidate"
+                  >
+                    <Check size={16} />
+                  </button>
+                {/if}
+                <button
+                  onclick={(e) => { e.stopPropagation(); toggleExpand(instructor.id); }}
+                  class="rounded p-1 text-muted-foreground hover:bg-muted transition-colors cursor-pointer"
+                  title={isExpanded ? "Collapse" : "Expand"}
+                >
+                  <ChevronRight size={16} class="transition-transform duration-200 {isExpanded ? 'rotate-90' : ''}" />
+                </button>
+              </div>
+            </td>
+          </tr>
+
+          <!-- Expanded detail panel -->
+          {#if isExpanded}
+            <tr class="border-border border-b bg-muted/20">
+              <td colspan="5" class="p-0">
+                <div class="p-4">
+                  {#if detailLoading}
+                    <p class="text-muted-foreground text-sm py-4 text-center">Loading details...</p>
+                  {:else if detailError}
+                    <p class="text-destructive text-sm py-2">{detailError}</p>
+                  {:else if detail}
+                    <div class="grid grid-cols-3 gap-6">
+                      <!-- Left: Instructor info -->
+                      <div class="space-y-3">
+                        <h3 class="font-medium text-foreground">Instructor</h3>
+                        <dl class="grid grid-cols-[auto_1fr] gap-x-3 gap-y-1.5 text-sm">
+                          <dt class="text-muted-foreground">Name</dt>
+                          <dd class="text-foreground">{formatInstructorName(detail.instructor.displayName)}</dd>
+
+                          <dt class="text-muted-foreground">Email</dt>
+                          <dd class="text-foreground">{detail.instructor.email}</dd>
+
+                          <dt class="text-muted-foreground">Courses</dt>
+                          <dd class="text-foreground tabular-nums">{detail.instructor.courseCount}</dd>
+
+                          {#if detail.instructor.subjectsTaught.length > 0}
+                            <dt class="text-muted-foreground">Subjects</dt>
+                            <dd class="flex flex-wrap gap-1">
+                              {#each detail.instructor.subjectsTaught as subj}
+                                <span class="rounded bg-muted px-1.5 py-0.5 text-xs">{subj}</span>
+                              {/each}
+                            </dd>
+                          {/if}
+                        </dl>
+                      </div>
+
+                      <!-- Right: Candidates (spans 2 cols) -->
+                      <div class="col-span-2 space-y-3">
+                        <div class="flex items-center justify-between">
+                          <h3 class="font-medium text-foreground">
+                            Candidates ({detail.candidates.length})
+                          </h3>
+                          {#if detail.candidates.some((c: CandidateResponse) => c.status !== "rejected" && !matchedLegacyIds.has(c.rmpLegacyId))}
+                            <button
+                              onclick={(e) => { e.stopPropagation(); handleRejectAll(detail!.instructor.id); }}
+                              disabled={actionLoading !== null}
+                              class="inline-flex items-center gap-1 rounded-md bg-red-100 px-2 py-1 text-xs font-medium text-red-700 hover:bg-red-200 dark:bg-red-900/30 dark:text-red-400 dark:hover:bg-red-900/50 transition-colors disabled:opacity-50 cursor-pointer"
+                            >
+                              <X size={12} /> Reject All
+                            </button>
+                          {/if}
+                        </div>
+
+                        {#if detail.candidates.length === 0}
+                          <p class="text-muted-foreground text-sm">No candidates available.</p>
+                        {:else}
+                          <div class="max-h-80 overflow-y-auto space-y-2 pr-1">
+                            {#each detail.candidates as candidate (candidate.id)}
+                              {@const isMatched = candidate.status === "matched" || matchedLegacyIds.has(candidate.rmpLegacyId)}
+                              {@const isRejected = candidate.status === "rejected"}
+                              {@const isPending = !isMatched && !isRejected}
+                              <div class="rounded-md border p-3 {isMatched ? 'border-l-4 border-l-green-500 bg-green-500/5 border-border' : isRejected ? 'border-border bg-card opacity-50' : 'border-border bg-card'}">
+                                <div class="flex items-start justify-between gap-2">
+                                  <div>
+                                    <div class="flex items-center gap-2">
+                                      <span class="font-medium text-foreground text-sm">
+                                        {candidate.firstName} {candidate.lastName}
+                                      </span>
+                                      {#if isMatched}
+                                        <span class="text-[10px] rounded px-1 py-0.5 bg-green-100 text-green-700 dark:bg-green-900/30 dark:text-green-400">
+                                          Matched
+                                        </span>
+                                      {:else if isRejected}
+                                        <span class="text-[10px] rounded px-1 py-0.5 bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-400">
+                                          Rejected
+                                        </span>
+                                      {/if}
+                                    </div>
+                                    {#if candidate.department}
+                                      <div class="text-xs text-muted-foreground">{candidate.department}</div>
+                                    {/if}
+                                  </div>
+                                  <div class="flex items-center gap-1 shrink-0">
+                                    {#if isMatched}
+                                      <button
+                                        onclick={(e) => { e.stopPropagation(); handleUnmatch(detail!.instructor.id, candidate.rmpLegacyId); }}
+                                        disabled={actionLoading !== null}
+                                        class="inline-flex items-center gap-1 rounded p-1 text-xs text-red-500 hover:bg-red-100 dark:hover:bg-red-900/30 transition-colors disabled:opacity-50 cursor-pointer"
+                                        title="Unmatch"
+                                      >
+                                        <XCircle size={14} /> Unmatch
+                                      </button>
+                                    {:else if isPending}
+                                      <button
+                                        onclick={(e) => { e.stopPropagation(); handleMatch(detail!.instructor.id, candidate.rmpLegacyId); }}
+                                        disabled={actionLoading !== null}
+                                        class="rounded p-1 text-green-600 hover:bg-green-100 dark:hover:bg-green-900/30 transition-colors disabled:opacity-50 cursor-pointer"
+                                        title="Accept"
+                                      >
+                                        <Check size={14} />
+                                      </button>
+                                      <button
+                                        onclick={(e) => { e.stopPropagation(); handleReject(detail!.instructor.id, candidate.rmpLegacyId); }}
+                                        disabled={actionLoading !== null}
+                                        class="rounded p-1 text-red-500 hover:bg-red-100 dark:hover:bg-red-900/30 transition-colors disabled:opacity-50 cursor-pointer"
+                                        title="Reject"
+                                      >
+                                        <X size={14} />
+                                      </button>
+                                    {/if}
+                                    <a
+                                      href={rmpUrl(candidate.rmpLegacyId)}
+                                      target="_blank"
+                                      rel="noopener noreferrer"
+                                      onclick={(e) => e.stopPropagation()}
+                                      class="rounded p-1 text-muted-foreground hover:bg-muted transition-colors cursor-pointer"
+                                      title="View on RMP"
+                                    >
+                                      <ExternalLink size={14} />
+                                    </a>
+                                  </div>
+                                </div>
+
+                                <!-- Stats row -->
+                                <div class="mt-2 flex items-center gap-3 text-xs">
+                                  {#if isRatingValid(candidate.avgRating, candidate.numRatings ?? 0)}
+                                    <span class="font-semibold tabular-nums" style={ratingStyle(candidate.avgRating!, themeStore.isDark)}>
+                                      {candidate.avgRating!.toFixed(1)}
+                                    </span>
+                                  {:else}
+                                    <span class="text-xs text-muted-foreground">N/A</span>
+                                  {/if}
+                                  {#if candidate.avgDifficulty !== null}
+                                    <span class="text-muted-foreground tabular-nums">{candidate.avgDifficulty.toFixed(1)} diff</span>
+                                  {/if}
+                                  <span class="text-muted-foreground">{candidate.numRatings} ratings</span>
+                                  {#if candidate.wouldTakeAgainPct !== null}
+                                    <span class="text-muted-foreground">{candidate.wouldTakeAgainPct.toFixed(0)}% again</span>
+                                  {/if}
+                                </div>
+
+                                <!-- Score bar (weighted segments) -->
+                                <div class="mt-2">
+                                  <div class="flex items-center gap-2 text-xs">
+                                    <span class="text-muted-foreground shrink-0">Score:</span>
+                                    <div class="bg-muted h-2 flex-1 rounded-full overflow-hidden flex">
+                                      {#each Object.entries(candidate.scoreBreakdown ?? {}) as [key, value]}
+                                        {@const w = scoreWeights[key] ?? 0}
+                                        {@const widthPct = (value as number) * w * 100}
+                                        <div
+                                          class="{scoreColors[key] ?? 'bg-primary'} h-full transition-all"
+                                          style="width: {widthPct}%"
+                                          title="{scoreLabels[key] ?? key}: {((value as number) * 100).toFixed(0)}% (×{w})"
+                                        ></div>
+                                      {/each}
+                                    </div>
+                                    <span class="tabular-nums font-medium text-foreground shrink-0">{formatScore(candidate.score ?? 0)}%</span>
+                                  </div>
+                                </div>
+                              </div>
+                            {/each}
+                          </div>
+                        {/if}
+                      </div>
+                    </div>
+                  {/if}
+                </div>
+              </td>
+            </tr>
+          {/if}
+        {/each}
+      </tbody>
+    </table>
+  </div>
+
+  <!-- Pagination -->
+  <div class="mt-4 flex items-center justify-between text-sm">
+    <span class="text-muted-foreground">
+      Showing {(currentPage - 1) * perPage + 1}–{Math.min(currentPage * perPage, totalCount)} of {totalCount}
+    </span>
+    <div class="flex items-center gap-2">
+      <button
+        onclick={() => goToPage(currentPage - 1)}
+        disabled={currentPage <= 1}
+        class="inline-flex items-center gap-1 rounded-md bg-muted px-2 py-1 text-sm text-foreground hover:bg-accent transition-colors disabled:opacity-50 cursor-pointer"
+      >
+        <ChevronLeft size={14} /> Prev
+      </button>
+      <span class="text-muted-foreground tabular-nums">
+        {currentPage} / {totalPages}
+      </span>
+      <button
+        onclick={() => goToPage(currentPage + 1)}
+        disabled={currentPage >= totalPages}
+        class="inline-flex items-center gap-1 rounded-md bg-muted px-2 py-1 text-sm text-foreground hover:bg-accent transition-colors disabled:opacity-50 cursor-pointer"
+      >
+        Next <ChevronRight size={14} />
+      </button>
+    </div>
+  </div>
+{/if}
+{/if}
@@ -0,0 +1,526 @@
+<script lang="ts">
+import { type ScrapeJob, client } from "$lib/api";
+import { FlexRender, createSvelteTable } from "$lib/components/ui/data-table/index.js";
+import { formatAbsoluteDate } from "$lib/date";
+import { formatDuration } from "$lib/time";
+import { ArrowDown, ArrowUp, ArrowUpDown, TriangleAlert } from "@lucide/svelte";
+import {
+  type ColumnDef,
+  type SortingState,
+  type Updater,
+  getCoreRowModel,
+  getSortedRowModel,
+} from "@tanstack/table-core";
+import { onMount } from "svelte";
+import { type ConnectionState, ScrapeJobsStore } from "$lib/ws";
+
+let jobs = $state<ScrapeJob[]>([]);
+let connectionState = $state<ConnectionState>("disconnected");
+let initialized = $state(false);
+let error = $state<string | null>(null);
+let sorting: SortingState = $state([]);
+let tick = $state(0);
+let subjectMap = $state(new Map<string, string>());
+
+let store: ScrapeJobsStore | undefined;
+
+// Shared tooltip state — single tooltip for all timing cells via event delegation
+let tooltipText = $state<string | null>(null);
+let tooltipX = $state(0);
+let tooltipY = $state(0);
+
+function showTooltip(event: MouseEvent) {
+  const target = (event.target as HTMLElement).closest<HTMLElement>("[data-timing-tooltip]");
+  if (!target) return;
+  tooltipText = target.dataset.timingTooltip ?? null;
+  tooltipX = event.clientX;
+  tooltipY = event.clientY;
+}
+
+function moveTooltip(event: MouseEvent) {
+  if (tooltipText === null) return;
+  const target = (event.target as HTMLElement).closest<HTMLElement>("[data-timing-tooltip]");
+  if (!target) {
+    tooltipText = null;
+    return;
+  }
+  tooltipText = target.dataset.timingTooltip ?? null;
+  tooltipX = event.clientX;
+  tooltipY = event.clientY;
+}
+
+function hideTooltip() {
+  tooltipText = null;
+}
+
+onMount(() => {
+  // Tick every second for live time displays
+  const tickInterval = setInterval(() => {
+    tick++;
+  }, 1000);
+
+  // Load subject reference data
+  client
+    .getReference("subject")
+    .then((entries) => {
+      const map = new Map<string, string>();
+      for (const entry of entries) {
+        map.set(entry.code, entry.description);
+      }
+      subjectMap = map;
+    })
+    .catch(() => {
+      // Subject lookup is best-effort
+    });
+
+  // Initialize WebSocket store
+  store = new ScrapeJobsStore(() => {
+    if (!store) return;
+    connectionState = store.getConnectionState();
+    initialized = store.isInitialized();
+    // getJobs() returns a cached array when unchanged, so only reassign
+    // when the reference differs to avoid triggering reactive table rebuilds.
+    const next = store.getJobs();
+    if (next !== jobs) jobs = next;
+  });
+  store.connect();
+
+  return () => {
+    clearInterval(tickInterval);
+    store?.disconnect();
+  };
+});
+
+function handleSortingChange(updater: Updater<SortingState>) {
+  sorting = typeof updater === "function" ? updater(sorting) : updater;
+}
+
+// --- Helper functions ---
+
+function formatJobDetails(job: ScrapeJob, subjects: Map<string, string>): string {
+  const payload = job.targetPayload as Record<string, unknown>;
+  switch (job.targetType) {
+    case "Subject": {
+      const code = payload.subject as string;
+      const desc = subjects.get(code);
+      return desc ? `${code} \u2014 ${desc}` : code;
+    }
+    case "CrnList": {
+      const crns = payload.crns as string[];
+      return `${crns.length} CRNs`;
+    }
+    case "SingleCrn":
+      return `CRN ${payload.crn as string}`;
+    case "CourseRange":
+      return `${payload.subject as string} ${payload.low as number}\u2013${payload.high as number}`;
+    default:
+      return JSON.stringify(payload);
+  }
+}
+
+function priorityColor(priority: string): string {
+  const p = priority.toLowerCase();
+  if (p === "urgent" || p === "critical") return "text-red-500";
+  if (p === "high") return "text-orange-500";
+  if (p === "low") return "text-muted-foreground";
+  return "text-foreground";
+}
+
+function retryColor(retryCount: number, maxRetries: number): string {
+  if (retryCount >= maxRetries && maxRetries > 0) return "text-red-500";
+  if (retryCount > 0) return "text-amber-500";
+  return "text-muted-foreground";
+}
+
+function statusColor(status: string): { text: string; dot: string } {
+  switch (status) {
+    case "processing":
+      return { text: "text-blue-500", dot: "bg-blue-500" };
+    case "pending":
+      return { text: "text-green-500", dot: "bg-green-500" };
+    case "scheduled":
+      return { text: "text-muted-foreground", dot: "bg-muted-foreground" };
+    case "staleLock":
+      return { text: "text-red-500", dot: "bg-red-500" };
+    case "exhausted":
+      return { text: "text-red-500", dot: "bg-red-500" };
+    default:
+      return { text: "text-muted-foreground", dot: "bg-muted-foreground" };
+  }
+}
+
+function formatStatusLabel(status: string): string {
+  // Convert camelCase to separate words, capitalize first letter
+  return status.replace(/([a-z])([A-Z])/g, "$1 $2").replace(/^\w/, (c) => c.toUpperCase());
+}
+
+function lockDurationColor(ms: number): string {
+  const minutes = ms / 60_000;
+  if (minutes >= 8) return "text-red-500";
+  if (minutes >= 5) return "text-amber-500";
+  return "text-foreground";
+}
+
+function overdueDurationColor(ms: number): string {
+  const minutes = ms / 60_000;
+  if (minutes >= 5) return "text-red-500";
+  return "text-amber-500";
+}
+
+// --- Table columns ---
+
+const columns: ColumnDef<ScrapeJob, unknown>[] = [
+  {
+    id: "id",
+    accessorKey: "id",
+    header: "ID",
+    enableSorting: false,
+  },
+  {
+    id: "status",
+    accessorKey: "status",
+    header: "Status",
+    enableSorting: true,
+    sortingFn: (rowA, rowB) => {
+      const order: Record<string, number> = {
+        processing: 0,
+        staleLock: 1,
+        pending: 2,
+        scheduled: 3,
+        exhausted: 4,
+      };
+      const a = order[rowA.original.status] ?? 3;
+      const b = order[rowB.original.status] ?? 3;
+      return a - b;
+    },
+  },
+  {
+    id: "targetType",
+    accessorKey: "targetType",
+    header: "Type",
+    enableSorting: false,
+  },
+  {
+    id: "details",
+    accessorFn: () => "",
+    header: "Details",
+    enableSorting: false,
+  },
+  {
+    id: "priority",
+    accessorKey: "priority",
+    header: "Priority",
+    enableSorting: true,
+    sortingFn: (rowA, rowB) => {
+      const order: Record<string, number> = {
+        critical: 0,
+        urgent: 0,
+        high: 1,
+        normal: 2,
+        medium: 2,
+        low: 3,
+      };
+      const a = order[String(rowA.original.priority).toLowerCase()] ?? 2;
+      const b = order[String(rowB.original.priority).toLowerCase()] ?? 2;
+      return a - b;
+    },
+  },
+  {
+    id: "timing",
+    accessorFn: (row) => {
+      if (row.lockedAt) return Date.now() - new Date(row.lockedAt).getTime();
+      return Date.now() - new Date(row.queuedAt).getTime();
+    },
+    header: "Timing",
+    enableSorting: true,
+  },
+];
+
+const table = createSvelteTable({
+  get data() {
+    return jobs;
+  },
+  getRowId: (row) => String(row.id),
+  columns,
+  state: {
+    get sorting() {
+      return sorting;
+    },
+  },
+  onSortingChange: handleSortingChange,
+  getCoreRowModel: getCoreRowModel(),
+  getSortedRowModel: getSortedRowModel(),
+  enableSortingRemoval: true,
+});
+
+const skeletonWidths: Record<string, string> = {
+  id: "w-6",
+  status: "w-20",
+  targetType: "w-16",
+  details: "w-32",
+  priority: "w-16",
+  timing: "w-32",
+};
+
+// Unified timing display: shows the most relevant duration for the job's current state.
+// Uses _tick dependency so Svelte re-evaluates every second.
+function getTimingDisplay(
+  job: ScrapeJob,
+  _tick: number
+): { text: string; colorClass: string; icon: "warning" | "none"; tooltip: string } {
+  const now = Date.now();
+  const queuedTime = new Date(job.queuedAt).getTime();
+  const executeTime = new Date(job.executeAt).getTime();
+
+  if (job.status === "processing" || job.status === "staleLock") {
+    const lockedTime = job.lockedAt ? new Date(job.lockedAt).getTime() : now;
+    const processingMs = now - lockedTime;
+    const waitedMs = lockedTime - queuedTime;
+
+    const prefix = job.status === "staleLock" ? "stale" : "processing";
+    const colorClass =
+      job.status === "staleLock" ? "text-red-500" : lockDurationColor(processingMs);
+
+    const tooltipLines = [
+      `Queued: ${formatAbsoluteDate(job.queuedAt)}`,
+      `Waited: ${formatDuration(Math.max(0, waitedMs))}`,
+    ];
+    if (job.lockedAt) {
+      tooltipLines.push(`Locked: ${formatAbsoluteDate(job.lockedAt)}`);
+    }
+    tooltipLines.push(
+      `${job.status === "staleLock" ? "Stale for" : "Processing"}: ${formatDuration(processingMs)}`
+    );
+
+    return {
+      text: `${prefix} ${formatDuration(processingMs)}`,
+      colorClass,
+      icon: job.status === "staleLock" ? "warning" : "none",
+      tooltip: tooltipLines.join("\n"),
+    };
+  }
+
+  if (job.status === "exhausted") {
+    const tooltipLines = [
+      `Queued: ${formatAbsoluteDate(job.queuedAt)}`,
+      `Retries: ${job.retryCount}/${job.maxRetries} exhausted`,
+    ];
+    return {
+      text: "exhausted",
+      colorClass: "text-red-500",
+      icon: "warning",
+      tooltip: tooltipLines.join("\n"),
+    };
+  }
+
+  // Scheduled (future execute_at)
+  const executeAtDiff = now - executeTime;
+  if (job.status === "scheduled" || executeAtDiff < 0) {
+    const tooltipLines = [
+      `Queued: ${formatAbsoluteDate(job.queuedAt)}`,
+      `Executes: ${formatAbsoluteDate(job.executeAt)}`,
+    ];
+    return {
+      text: `in ${formatDuration(Math.abs(executeAtDiff))}`,
+      colorClass: "text-muted-foreground",
+      icon: "none",
+      tooltip: tooltipLines.join("\n"),
+    };
+  }
+
+  // Pending (overdue — execute_at is in the past, waiting to be picked up)
+  const waitingMs = now - queuedTime;
+  const tooltipLines = [
+    `Queued: ${formatAbsoluteDate(job.queuedAt)}`,
+    `Waiting: ${formatDuration(waitingMs)}`,
+  ];
+  return {
+    text: `waiting ${formatDuration(waitingMs)}`,
+    colorClass: overdueDurationColor(waitingMs),
+    icon: "warning",
+    tooltip: tooltipLines.join("\n"),
+  };
+}
+</script>
+
+<div class="flex items-center justify-between mb-4">
+  <h1 class="text-lg font-semibold text-foreground">Scrape Jobs</h1>
+  <div class="flex items-center gap-2 text-sm">
+    {#if connectionState === "connected"}
+      <span class="inline-flex items-center gap-1.5">
+        <span class="size-2 shrink-0 rounded-full bg-green-500"></span>
+        <span class="text-green-500">Live</span>
+      </span>
+    {:else if connectionState === "reconnecting"}
+      <span class="inline-flex items-center gap-1.5">
+        <span class="size-2 shrink-0 rounded-full bg-amber-500"></span>
+        <span class="text-amber-500">Reconnecting...</span>
+      </span>
+    {:else}
+      <span class="inline-flex items-center gap-2">
+        <span class="inline-flex items-center gap-1.5">
+          <span class="size-2 shrink-0 rounded-full bg-red-500"></span>
+          <span class="text-red-500">Disconnected</span>
+        </span>
+        <button
+          class="rounded-md bg-muted px-2 py-0.5 text-xs font-medium text-foreground hover:bg-muted/80 transition-colors"
+          onclick={() => store?.retry()}
+        >
+          Retry
+        </button>
+      </span>
+    {/if}
+  </div>
+</div>
+
+{#if error}
+  <p class="text-destructive">{error}</p>
+{:else}
+  <div class="bg-card border-border overflow-hidden rounded-lg border">
+    <!-- svelte-ignore a11y_no_noninteractive_element_interactions -->
+    <table
+      class="w-full border-collapse text-xs"
+      onmouseenter={showTooltip}
+      onmousemove={moveTooltip}
+      onmouseleave={hideTooltip}
+    >
+      <thead>
+        {#each table.getHeaderGroups() as headerGroup}
+          <tr class="border-b border-border text-left text-muted-foreground">
+            {#each headerGroup.headers as header}
+              <th
+                class="px-3 py-2.5 font-medium whitespace-nowrap"
+                class:cursor-pointer={header.column.getCanSort()}
+                class:select-none={header.column.getCanSort()}
+                onclick={header.column.getToggleSortingHandler()}
+              >
+                {#if header.column.getCanSort()}
+                  <span class="inline-flex items-center gap-1">
+                    {#if typeof header.column.columnDef.header === "string"}
+                      {header.column.columnDef.header}
+                    {:else}
+                      <FlexRender
+                        content={header.column.columnDef.header}
+                        context={header.getContext()}
+                      />
+                    {/if}
+                    {#if header.column.getIsSorted() === "asc"}
+                      <ArrowUp class="size-3.5" />
+                    {:else if header.column.getIsSorted() === "desc"}
+                      <ArrowDown class="size-3.5" />
+                    {:else}
+                      <ArrowUpDown class="size-3.5 text-muted-foreground/40" />
+                    {/if}
+                  </span>
+                {:else if typeof header.column.columnDef.header === "string"}
+                  {header.column.columnDef.header}
+                {:else}
+                  <FlexRender
+                    content={header.column.columnDef.header}
+                    context={header.getContext()}
+                  />
+                {/if}
+              </th>
+            {/each}
+          </tr>
+        {/each}
+      </thead>
+      {#if !initialized}
+        <tbody>
+          {#each Array(5) as _}
+            <tr class="border-b border-border">
+              {#each columns as col}
+                <td class="px-3 py-2.5">
+                  <div
+                    class="h-3.5 rounded bg-muted animate-pulse {skeletonWidths[col.id ?? ''] ?? 'w-20'}"
+                  ></div>
+                </td>
+              {/each}
+            </tr>
+          {/each}
+        </tbody>
+      {:else if jobs.length === 0}
+        <tbody>
+          <tr>
+            <td colspan={columns.length} class="py-12 text-center text-muted-foreground">
+              No scrape jobs found.
+            </td>
+          </tr>
+        </tbody>
+      {:else}
+        <tbody>
+          {#each table.getRowModel().rows as row (row.id)}
+            {@const job = row.original}
+            {@const sc = statusColor(job.status)}
+            {@const timingDisplay = getTimingDisplay(job, tick)}
+            <tr
+              class="border-b border-border last:border-b-0 hover:bg-muted/50 transition-colors"
+            >
+              {#each row.getVisibleCells() as cell (cell.id)}
+                {@const colId = cell.column.id}
+                {#if colId === "id"}
+                  <td class="px-3 py-2.5 tabular-nums text-muted-foreground/70 w-12">{job.id}</td>
+                {:else if colId === "status"}
+                  <td class="px-3 py-2.5 whitespace-nowrap">
+                    <span class="inline-flex items-center gap-1.5">
+                      <span class="size-1.5 shrink-0 rounded-full {sc.dot}"></span>
+                      <span class="flex flex-col leading-tight">
+                        <span class={sc.text}>{formatStatusLabel(job.status)}</span>
+                        {#if job.maxRetries > 0}
+                          <span class="text-[10px] {retryColor(job.retryCount, job.maxRetries)}">
+                            {job.retryCount}/{job.maxRetries} retries
+                          </span>
+                        {/if}
+                      </span>
+                    </span>
+                  </td>
+                {:else if colId === "targetType"}
+                  <td class="px-3 py-2.5 whitespace-nowrap">
+                    <span
+                      class="inline-flex items-center rounded-md bg-muted/60 px-1.5 py-0.5 font-mono text-[11px] text-muted-foreground"
+                    >
+                      {job.targetType}
+                    </span>
+                  </td>
+                {:else if colId === "details"}
+                  <td class="px-3 py-2.5 max-w-48 truncate text-muted-foreground" title={formatJobDetails(job, subjectMap)}>
+                    {formatJobDetails(job, subjectMap)}
+                  </td>
+                {:else if colId === "priority"}
+                  <td class="px-3 py-2.5 whitespace-nowrap">
+                    <span class="font-medium capitalize {priorityColor(job.priority)}">
+                      {job.priority}
+                    </span>
+                  </td>
+                {:else if colId === "timing"}
+                  <td class="px-3 py-2.5 whitespace-nowrap">
+                    <span
+                      class="inline-flex items-center gap-1.5 tabular-nums text-foreground"
+                      data-timing-tooltip={timingDisplay.tooltip}
+                    >
+                      <span class="size-3.5 shrink-0 inline-flex items-center justify-center {timingDisplay.colorClass}">
+                        {#if timingDisplay.icon === "warning"}
+                          <TriangleAlert class="size-3.5" />
+                        {/if}
+                      </span>
+                      {timingDisplay.text}
+                    </span>
+                  </td>
+                {/if}
+              {/each}
+            </tr>
+          {/each}
+        </tbody>
+      {/if}
+    </table>
+  </div>
+
+  {#if tooltipText !== null}
+    <div
+      class="pointer-events-none fixed z-50 bg-card text-card-foreground text-xs border border-border rounded-md px-2.5 py-1.5 shadow-sm whitespace-pre-line max-w-max text-left"
+      style="left: {tooltipX + 12}px; top: {tooltipY + 12}px;"
+    >
+      {tooltipText}
+    </div>
+  {/if}
+{/if}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Xevion	75a99c10ea	feat: add scrape job result persistence for effectiveness tracking	2026-01-30 01:37:41 -06:00
Xevion	857ceabcca	fix: prevent ts-rs serde warnings	2026-01-30 01:36:57 -06:00
Xevion	203c337cf0	feat: add confidence-based RMP matching with manual review workflow Replace simple auto-matching with scored candidate generation that considers department overlap, name uniqueness, and rating volume. Candidates above 0.85 auto-accept; others require admin approval.	2026-01-30 01:31:11 -06:00
Xevion	39ba131322	feat: add mobile touch controls with gesture detection	2026-01-29 23:56:45 -06:00
Xevion	2fad9c969d	fix: avoid title on icon, use simpler href-based login redirect	2026-01-29 23:44:05 -06:00
Xevion	47b4f3315f	feat: enhance login page with FAQ section and improved styling	2026-01-29 23:40:48 -06:00
Xevion	fa28f13a45	feat: add interactive timeline visualization for class times Implements a canvas-based timeline view with D3 scales showing class counts across subjects. Features drag-to-pan, mouse wheel zoom, subject filtering, hover tooltips, and smooth animations. Timeline auto-follows current time and supports keyboard navigation.	2026-01-29 23:19:39 -06:00
Xevion	5a6ea1e53a	fix: handle backend startup delays with retry logic in auth	2026-01-29 20:04:50 -06:00
Xevion	ba2b2fc50a	fix: increase Banner API timeouts to handle slow responses	2026-01-29 19:49:57 -06:00
Xevion	cfe098d193	feat: add websocket support for real-time scrape job monitoring	2026-01-29 19:31:04 -06:00
Xevion	d861888e5e	fix: proper centering for login page content, avoid unnecssary scrollbar	2026-01-29 18:05:50 -06:00
Xevion	f0645d82d9	refactor: persist audit log state in module scope for cross-navigation caching	2026-01-29 17:54:27 -06:00
Xevion	7a1cd2a39b	refactor: centralize number formatting with locale-aware utility	2026-01-29 17:53:38 -06:00
Xevion	d2985f98ce	feat: enhance audit log with smart diffing, conditional request caching, auto refreshing	2026-01-29 17:35:11 -06:00
Xevion	b58eb840f3	refactor: consolidate navigation with top nav bar and route groups	2026-01-29 17:01:47 -06:00
Xevion	2bc6fbdf30	feat: implement relative time feedback and improve tooltip customization	2026-01-29 16:44:06 -06:00
Xevion	e41b970d6e	fix: implement i64 serialization for JavaScript compatibility, fixing avatar URL display	2026-01-29 15:51:19 -06:00
Xevion	e880126281	feat: implement worker timeout protection and crash recovery for job queue Add JOB_TIMEOUT constant to fail stuck jobs after 5 minutes, and LOCK_EXPIRY to reclaim abandoned locks after 10 minutes. Introduce force_unlock_all to recover orphaned jobs at startup. Fix retry limit off-by-one error and update deduplication to include locked jobs.	2026-01-29 15:50:09 -06:00
Xevion	db0ec1e69d	feat: add rmp profile links and confidence-aware rating display	2026-01-29 15:43:39 -06:00
Xevion	2947face06	fix: run frontend build first with -e embed flag in Justfile	2026-01-29 15:00:13 -06:00
Xevion	36bcc27d7f	feat: setup smart page transitions, fix laggy theme-aware element transitions	2026-01-29 14:59:47 -06:00
Xevion	9e403e5043	refactor: modernize Justfile commands and simplify service management	2026-01-29 14:33:16 -06:00
Xevion	98a6d978c6	feat: implement course change auditing with time-series metrics endpoint	2026-01-29 14:19:36 -06:00
Xevion	4deeef2f00	feat: optimize asset delivery with build-time compression and encoding negotiation	2026-01-29 13:56:10 -06:00
Xevion	e008ee5a12	feat: show search duration and result count feedback	2026-01-29 13:15:25 -06:00
Xevion	a007ccb6a2	fix: remove out:fade transition from CourseTable	2026-01-29 13:08:45 -06:00
Xevion	527cbebc6a	feat: implement user authentication system with admin dashboard	2026-01-29 12:56:51 -06:00
Xevion	4207783cdd	docs: add changelog entries and roadmap completion tracking	2026-01-29 12:27:46 -06:00
Xevion	c90bd740de	refactor: consolidate query logic and eliminate N+1 instructor loads	2026-01-29 12:03:06 -06:00
Xevion	61f8bd9de7	refactor: consolidate menu snippets and strengthen type safety Replaces duplicated dropdown/context menu code with parameterized snippet, eliminates unsafe type casts, adds error handling for clipboard and API calls, and improves accessibility annotations.	2026-01-29 11:40:55 -06:00
Xevion	b5eaedc9bc	feat: add delivery mode indicators and tooltips to location column	2026-01-29 11:32:35 -06:00
Xevion	58475c8673	feat: add page selector dropdown with animated pagination controls Replace Previous/Next buttons with 5-slot page navigation centered in pagination bar. Current page becomes a dropdown trigger allowing direct page jumps. Side slots animate on page transitions.	2026-01-29 11:31:55 -06:00
Xevion	78159707e2	feat: table FLIP animations, improved time tooltip details & day abbreviations	2026-01-29 03:40:40 -06:00
Xevion	779144a4d5	feat: implement smart name abbreviation for instructor display	2026-01-29 03:14:55 -06:00
Xevion	0da2e810fe	feat: add multi-select subject filtering with searchable comboboxes	2026-01-29 03:03:21 -06:00
Xevion	ed72ac6bff	refactor: extract reusable SimpleTooltip component and enhance UI hints	2026-01-29 01:37:04 -06:00
Xevion	57b5cafb27	feat: enhance table scrolling and eliminate initial theme flash	2026-01-29 01:18:02 -06:00