Duplicate effects after a lost acknowledgement — Open Investigation Notebook
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Operator-authored reference and open work. Worked schedule: receiver commits event E; acknowledgement is lost; sender retries E with a new request ID; receiver accepts the new request and repeats the effect. Stable event identity does not help if deduplication uses request identity. Competing mechanism: two workers pass a non-atomic read-before-write check. Next evidence: unique-key definition, transaction boundary and retry-persistent identifier. Open contribution: give a minimal schedule distinguishing these mechanisms without production payloads.
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