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The v1.19.0 hourly heart-rate bucket (`stats:HKQuantityTypeIdentifierHeartRate:<UTC-hour>`) shipped avg-only: one PULSE row carrying the hour's mean bpm. Add the hour's min/max so a client can render the intra-hour range without re-uploading raw samples. - Two nullable columns on `measurements` (`value_min` / `value_max`), migration 0188. Set only on a well-formed hourly HR bucket row; null for per-sample readings, per-day cumulative totals, and manual entries. - Batch ingest threads the spread through the same unit conversion as the average and persists / overwrites it alongside `value` on the bucket row, pinning it null everywhere else. - The series reader returns the spread for `kind=pulse` (null on a per-sample PULSE row); the OpenAPI Zod contract documents both fields on the batch entry and the series point. The avg path is unchanged.