5003. Performance Schema & sys: wait-event investigation — Prove correctness with targeted queries and assertions. — HRMS — Python + FastAPI + mysql-connector

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Scenario: A HRMS application must handle wait-event investigation. Prove correctness with targeted queries and assertions. 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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