Deduplication window.

also: dedup window · deduplication windows · idempotency TTL

How long processed IDs or idempotency keys are remembered; it must outlast every possible retry.

the two-minute refresher

Forever is too long: storage grows without bound and legitimate re-submissions are blocked.
Too short is useless: a 10 s TTL can't protect a request that times out at 30 s.
Rule of thumb from the lesson: at least 10× your maximum retry window.
Store what you need to replay: status, response, and a hash of the request.

also: dedup window · deduplication windows · idempotency TTL

How long processed IDs or idempotency keys are remembered; it must outlast every possible retry.

Forever is too long: storage grows without bound and legitimate re-submissions are blocked.
Too short is useless: a 10 s TTL can't protect a request that times out at 30 s.
Rule of thumb from the lesson: at least 10× your maximum retry window.
Store what you need to replay: status, response, and a hash of the request.