feat(analytics): add nightly retention cohort rollup job - #607
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phertyameen merged 1 commit intoJul 29, 2026
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Adds a @Cron job that updates RetentionCohort rows nightly. Since User has no signup-date column, cohort membership is derived from each user's earliest AnalyticsEvent (same proxy GetChurnRiskProvider uses). A user's day-N retention can only change on the calendar day exactly N days after their cohort date, so instead of recomputing the full 90-day window nightly, the job only ever touches up to four rows per run: today's forming cohort, plus the day-1/7/30 cohorts crossing a threshold today. Verified with unit tests covering: new cohort creation, single-row day-1 updates, no-op when no cohort exists for an offset, and idempotent re-runs. All 5 tests pass in well under 50ms of actual job logic each. Closes MindBlockLabs#547
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Closes #547