Queues may redeliver and workers may crash between effects and acknowledgements. Exactly-once business behavior usually comes from deduplication, transactions, and idempotent consumers, not transport promises alone.

Exactly-Once Effects Are an End-to-End Claim

In this situation—ensuring one approved notification is sent despite message redelivery—which choice best applies “Exactly-Once Effects Are an End-to-End Claim”?

A saga sequences distributed transactions and defines compensations when later steps fail. Compensation is a new domain action and may not perfectly erase the original effect.

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