4355. InnoDB Internals: doublewrite validation — Recover from failure without violating consistency. — HRMS — Node.js + Express + Sequelize

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Scenario: A HRMS application must handle doublewrite validation. Recover from failure without violating consistency. 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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