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Xevion
669dec0235
Implements POST /api/timeline endpoint that aggregates enrollment by subject over 15-minute slots, filtering courses by their actual meeting times. Includes ISR-style schedule cache with hourly background refresh using stale-while-revalidate pattern, database indexes for efficient queries, and frontend refactor to dynamically discover subjects from API.
14 lines
658 B
SQL
14 lines
658 B
SQL
-- Indexes for the timeline aggregation endpoint.
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-- The query buckets course_metrics by 15-minute intervals, joins to courses
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-- for subject, and aggregates enrollment. These indexes support efficient
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-- time-range scans and the join.
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-- Primary access pattern: scan course_metrics by timestamp range
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CREATE INDEX IF NOT EXISTS idx_course_metrics_timestamp
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ON course_metrics (timestamp);
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-- Composite index for the DISTINCT ON (bucket, course_id) ordered by timestamp DESC
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-- to efficiently pick the latest metric per course per bucket.
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CREATE INDEX IF NOT EXISTS idx_course_metrics_course_timestamp
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ON course_metrics (course_id, timestamp DESC);
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