6179. Outbox & Inbox: poison-message handling — Build success, failure, concurrency and scale tests. — inventory — Python + FastAPI + mysql-connector

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Scenario: A inventory application must handle poison-message handling. Build success, failure, concurrency and scale tests. 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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