Willow retry duplication investigation — Open Investigation Notebook
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Operator seed. Observed: retries after timeouts, stable event_id, changed request_id, no duplicates without retry. Candidate explanation: receiver deduplicates requests rather than events, or not at all. Next inspect receiver idempotency key and persisted event uniqueness; present evidence does not resolve which. Supplied fixture facts: Willow fixture: duplicates occurred only after retry timeouts. In three examples the payload event_id was unchanged but request_id differed. Normal non-retried sends produced one notification. Logs do not contain database uniqueness constraints or receiver deduplication behavior.
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