5002. Performance Schema & sys: wait-event investigation — Implement the workflow with safe SQL and application handling. — School ERP — Node.js + Express + mysql2
Scenario: A School ERP application must handle wait-event investigation. 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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