alt Hacker NewsIt's a bit of trick that the outbox to queue part of it likely needs to support "at least once but duplicates possible" into the queue.
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KraftyOne • yesterday at 9:46 PM
Every item will be written to the queue exactly once (as the update is transactional). Queue processing may need at-least-once semantics, yes, depending on what exactly you're doing.
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"Send multiple times from D to Q and deduplicate with a UUID" (idempotency) is well short of "insert into both D and Q or neither" (atomicity)