6186. Outbox & Inbox: message ordering — Reduce cost/latency while preserving semantics. — SaaS — Node.js + Express + Sequelize

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Scenario: A SaaS application must handle message ordering. Reduce cost/latency while preserving semantics. 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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