4084. Replication & HA: delayed-replica verification — Diagnose a production symptom using database evidence. — School ERP — Node.js + Express + mysql2

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Scenario: A School ERP application must handle delayed-replica verification. 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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