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Duplicate Orders Are a Spec Bug, Not a Model Bug

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

You should freeze idempotency rules before a coding agent writes POST /orders, because retries will otherwise insert duplicate rows. Most agents invent a cache, a unique index, or a loose header, then mix those three models under concurrent retries. This case study walks a tiny checkout service fro…

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  1. 2026-09-16 04:16 · DEV Community — AI
    Duplicate Orders Are a Spec Bug, Not a Model Bug

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