4542. Optimizer Engineering: plan-regression detection — Implement the workflow with safe SQL and application handling. — e-commerce — Node.js + Express + Sequelize
Scenario: A e-commerce application must handle plan-regression detection. Implement the workflow with safe SQL and application handling. 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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