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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.