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A Unique Constraint Protects the Ledger, Not the Action: Making an AI Write Happen Once

This story is from 2026-10-15. It is preserved in the archive; the latest stories are on the live feed.

An assistant calls a tool that writes. That call can arrive twice: the model retries it, the same confirmation gets decided twice, or the process restarts mid-flight. A second arrival must not write a second time. The usual answer is an idempotency key with a unique constraint on it, and that is no…

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  1. 2026-10-15 01:41 · DEV Community — AI
    A Unique Constraint Protects the Ledger, Not the Action: Making an AI Write Happen Once

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