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Extend MeasurementType with the seven HealthKit-shaped values the iOS batch ingest needs (HRV, resting HR, active energy, flights climbed, distance, VO2 max, body temperature) and add APPLE_HEALTH to the MeasurementSource enum. Sleep duration unit shifts from hours to minutes so per-stage HKCategorySample rows persist without precision loss; the new SleepStage enum mirrors the existing GlucoseContext column shape and a CHECK constraint scopes it to SLEEP_DURATION rows. The composite unique index `(user_id, type, source, external_id)` gives the new batch endpoint an idempotent dedup key while the legacy `(user_id, type, measured_at, source)` index continues to back the manual UI's no-duplicate-at-the-same-wall-clock guard. NULL externalId rows stay distinct under Postgres semantics so manual entries never collide. Migration is strictly additive: new enum values append, new columns are nullable, no rows mutate. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>