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HealthLog/prisma/migrations
Marc-André Bombeck 22d7e8c30c feat(measurements): keep the intraday shape of a cumulative day
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.
2026-07-27 23:00:19 +02:00
..
2026-03-10 20:14:33 +01:00