4524. Optimizer Engineering: optimizer-trace analysis — Diagnose a production symptom using database evidence. — e-commerce — Node.js + Express + Sequelize

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Scenario: A e-commerce application must handle optimizer-trace analysis. Diagnose a production symptom using database evidence. 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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