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Google re-scores a night after the fact, and the sync re-reads recent nights to pick that up. The per-segment sleep externalId keyed on a volatile anchor (the session end instant plus a positional index), so a re-read minted fresh ids and landed as a SECOND parallel copy of the night instead of overwriting the first — the night-total then summed both (a real 7h35 night could read as 10h+). Each segment now keys on a stable identity: the session's own resource id (as the workout mapper already does) plus the segment's own start, dropping the shifting end anchor and the positional index. A mere re-classification of a block now updates in place. And before writing a re-read night, the sync soft-deletes any superseded rows left in that night's window (bounded to the session's own span, never a fresh row), so the night collapses to one canonical set. Nights already stored with duplicates heal as they are re-read within the sync overlap; scripts/repair-google-health-sleep.ts re-syncs the full history at once for older nights (dry-run by default, --run to execute).
944 KiB
944 KiB