Setup structlog, delete randomized IPs on startup

- minor formatting, type fixes

backend/linkpulse/logging.py

@@ -0,0 +1,61 @@
+import logging
+import sys
+from typing import List
+
+import structlog
+from structlog.stdlib import ProcessorFormatter
+from structlog.types import Processor
+
+shared_processors: List[Processor] = [
+    structlog.stdlib.add_log_level,
+    structlog.processors.CallsiteParameterAdder(
+        {
+            structlog.processors.CallsiteParameter.MODULE,
+            structlog.processors.CallsiteParameter.FILENAME,
+            structlog.processors.CallsiteParameter.LINENO,
+        }
+    ),
+    structlog.processors.TimeStamper(fmt="%Y-%m-%d %H:%M:%S.%f"),
+]
+
+structlog_processors = shared_processors + []
+# Remove _record & _from_structlog.
+logging_processors: List[Processor] = [ProcessorFormatter.remove_processors_meta]
+
+if sys.stderr.isatty():
+    console_renderer = structlog.dev.ConsoleRenderer()
+    logging_processors.append(console_renderer)
+    structlog_processors.append(console_renderer)
+else:
+    json_renderer = structlog.processors.JSONRenderer(indent=1, sort_keys=True)
+    structlog_processors.append(json_renderer)
+    logging_processors.append(json_renderer)
+
+structlog.configure(
+    processors=structlog_processors,
+    wrapper_class=structlog.stdlib.BoundLogger,
+    # logger_factory=structlog.stdlib.LoggerFactory(),
+    logger_factory=structlog.PrintLoggerFactory(sys.stderr),
+    context_class=dict,
+    cache_logger_on_first_use=True,
+)
+
+
+formatter = ProcessorFormatter(
+    # These run ONLY on `logging` entries that do NOT originate within
+    # structlog.
+    foreign_pre_chain=shared_processors,
+    # These run on ALL entries after the pre_chain is done.
+    processors=logging_processors,
+)
+
+handler = logging.StreamHandler(sys.stderr)
+# Use OUR `ProcessorFormatter` to format all `logging` entries.
+handler.setFormatter(formatter)
+logging.basicConfig(handlers=[handler], level=logging.INFO)
+
+external_loggers = ["uvicorn.error", "uvicorn.access"]
+for logger_name in external_loggers:
+    logger = logging.getLogger(logger_name)
+    logger.handlers = [handler]
+    logger.propagate = False