4319. InnoDB Internals: redo-capacity planning — Build success, failure, concurrency and scale tests. — HRMS — Node.js + Express + Sequelize
Scenario: A HRMS application must handle redo-capacity planning. Build success, failure, concurrency and scale tests. 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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