mirror of
https://github.com/MBombeck/HealthLog.git
synced 2026-11-13 06:32:03 +00:00
Marc-André Bombeck
22d7e8c30c
A cumulative metric has no meaningful latest reading — a partial day's step count is a fragment, not a value — so the only honest comparison is against the same person's own typical total at the same local hour. That needs an hourly substrate and there was none: the nightly cumulative drain collapses per-sample Apple Health rows into one daily total after the grace window and hard-deletes the originals in the same transaction. Today's curve was derivable; every older day's was already gone. Fold the rows into twenty-four running totals and write them down first, in the same transaction and before the delete. The merge is additive so a day drained twice keeps both halves, and the rows are re-read under the advisory lock the drain already takes so an overlapping tick folds nothing. One table, one nightly range delete to bound it.