- Migration 0004: composite indexes (user_id, date) on sessions and
daily_stats; (user_id, start_at, end_at) on planned_blocks and
manual_entries — speeds up calendar and monthly/dow queries
- admin POST /recompute-stats: recomputes all DailyStat records from raw
session wall-clock intervals; use once after upgrading to fix historical
data that was stored as active_hours
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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