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Marc-André Bombeck
accd7c8514
A measurement logged by hand on the iOS app while offline is mirrored into HealthKit. On pairing a server, adopt-on-pair uploads it as a MANUAL row while HealthKit background sync independently re-ingests the same sample as an APPLE_HEALTH row. The two carry different external ids and sources, so the composite unique index keeps both — doubling the whole hand-logged history on first pair. Collapse the pair at ingest: an incoming MANUAL or APPLE_HEALTH row is dropped as a duplicate when a same-reading row of the opposite source already exists (same type and value, measuredAt within two seconds). The match is scoped to that one cross-source pair, so same-source rows and rows from server-owned sources keep their existing contracts, and two genuinely distinct readings at the same minute never collapse. stats:* cumulative rows stay on their per-day overwrite lane. The collapsed copy returns status "duplicate" with reason "cross_source_merge" so the client cursor advances unchanged; no schema, migration, or OpenAPI change.