6321. Slowly Changing Dimensions: SCD type-3 history — Design the database contract and invariants. — finance — Python + FastAPI + SQLAlchemy
Scenario: A finance application must handle SCD type-3 history. Design the database contract and invariants. 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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