Experiment Shows 'Persist-Then-Ack' Webhook Pattern Prevents Silent Event Loss

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A software developer ran a controlled experiment to test whether webhook handler design affects silent data loss during process crashes. Two variants were compared across 50 trials each: one that acknowledges delivery before saving to the database, and one that saves first then acknowledges. The ack-then-persist approach lost events in all 50 trials, as the process was killed after sending a 200 response but before the database write completed, leaving the provider with no reason to retry. The persist-then-ack variant lost zero events, since a committed write before acknowledgment ensures retries can recover any unacknowledged delivery. A secondary concurrency test found that database-level unique constraints, not application logic, were responsible for preventing duplicate rows during simultaneous requests.

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