DynamoDB ClientRequestToken 8-hour TTL: handling retries after token expiry
Idempotent write safety beyond the token retention window DynamoDB stores a ClientRequestToken for PutItem, UpdateItem, and DeleteItem operations for up to 8 hours. Within that window, retries with the same token return the original response without re-executing the write. After the token is purged, a retry with the same token executes as a new write, which
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