Files
HealthLog/tests/integration
Marc-André Bombeck adc7baca14 Fold only complete local days and repair means folded from part of one
The daily-mean consolidation and the dense hourly fold cut at
`now - threshold` instead of a local day boundary. A day was folded in two
runs and the second run overwrote the stored mean with the mean of the
later part alone: every mean-type day, and the boundary hour of every
heart-rate, HRV and SpO2 day, plus the derived resting figure and the DAY
rollup of such a day. The Health Connect importer split its raw window at
the same unaligned instant.

- Fold up to the start of the account's local day the threshold ends in
  (`foldBoundary`), for every consolidation pass and the Health Connect
  importer's raw/hourly split.
- A window that already has a live `stats:` row is refolded from every
  sample of it, live rows plus the fold's own tombstones; with none left
  the stored mean stays.
- `folded_window` refuses a raw sample only when its local day lies before
  the aligned boundary and a live `stats:` row of its source covers it,
  also within reach of the sample after a timezone change.
- A deletion inside a day the fold had not finished is class B.
- Add a one-time, resumable fold repair per account that recomputes each
  hourly and daily mean from its remaining samples and writes only values
  that differ, recorded in `measurement_fold_repairs` (migration 0389).
- The compaction-tombstone purge waits for the repair per account, and the
  boot sends no purge run before one account is repaired.
- The restore keys live `stats:` ids by source, and writes compaction
  tombstones back from a file older than the account's repair, resetting
  the repair.
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