feat: add cross-cohort metrics endpoint - #90
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Adds GET /cohorts/metrics (TA/Admin) returning retention, attendance, and completion metrics for every cohort in a single response. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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July 31, 2026 11:44
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Summary
GET /cohorts/metrics(TA/Admin only), returningCohortMetricsDto[]— retention, attendance, and completion metrics for every cohort in one call.avgAttendanceRate= mean over completed weeks of (attended / registered).retentionRate= attendance rate of the most recently completed week (last point in the attendance trend), withretainedStudentsas the underlying count.completionRate= fraction of registered members who attended the cohort'sGRADUATIONweek (0 until the cohort actually reaches it).computeCohortMetrics()helper (src/cohorts/cohort-metrics.util.ts) for reuse/readability.Test plan
tsc --noEmitpasseseslintpasses on changed filesGET /cohorts/metricsas a TA/Admin user against a seeded DB and spot-check numbers against a known cohort🤖 Generated with Claude Code