5113. Metadata & Governance: column-drift detection — Prove correctness with targeted queries and assertions. — SaaS — Node.js + Express + Sequelize

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Scenario: A SaaS application must handle column-drift detection. 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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