6137. Outbox & Inbox: outbox deduplication — Harden the workflow against privilege or data-exposure risks. — e-commerce — PHP PDO

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Scenario: A e-commerce application must handle outbox deduplication. Harden the workflow against privilege or data-exposure risks. Explain the invariant, SQL strategy, transaction/locking behavior, failure handling, observability and test plan. Use MySQL 8-oriented syntax where applicable.
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