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Marc-André Bombeck
1fca6c1d25
The persistent mood-rollup writer bucketed on the UTC truncation of `mood_logged_at` and ignored the canonical per-row `MoodEntry.date` label. Every coverage-miss fallback keys on `entry.date`, so the rollup tier disagreed with the fallback and with the day the user logged the mood: a late-evening or after-midnight local mood landed on the wrong calendar day, and the label shifted the moment the boot backfill flipped a user from the live fallback onto the rollup tier. Key every bucket off the stored `date` label instead — DAY, WEEK, MONTH and YEAR — with `bucket_start` set to that label's UTC-midnight instant. The rollup is now byte-identical to the live `entry.date` fallback and timezone-independent by construction: DST correctness stays where it already lives, in `moodDateKey` at write time. No consumer changes, no schema change; every rollup reader already formats `bucket_start` as a UTC day label. Migration 0269 empties `mood_entry_rollups` so the boot-time full-backfill worker re-mints every user's buckets under the corrected keying; the worker now deletes-then-refolds so it is self-cleaning against any row left by an older instance. While the table is empty, reads fall back to the live `date`-keyed walk, which was already correct, so there is no window where a wrong day is shown.