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AI-generatedDuplicate writes on Vercel Serverless Function retries despite Idempotency-Key usage
The goal is to achieve exactly‑once semantics for side‑effects (e.g., writes to a database or KV store) when a Vercel Serverless Function is retried by a client after a transient network error or 5xx response. Vercel treats each retry as a new invocation with a distinct request ID, so without application‑level guards the same logical request can trigger mult
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