vigilcare-clinical/docs/resilience/climate/2026-06-24-duplicate-batch-learned.md

Batch reference idempotency works as specified: replaying the same gateway sync payload does not create a second batch row or re-process observations. This is the clinical equivalent of POS offline sync deduplication and protects against network retries after partial ACK. The integration test DuplicateBatchReference_ReturnsExisting passed in 702 ms, giving CI-guaranteed evidence for interview demos without requiring a manual chaos run.