4277. Binlog & CDC: dead-letter change handling — Harden the workflow against privilege or data-exposure risks. — finance — Java Spring/JDBC
Scenario: A finance application must handle dead-letter change handling. Harden the workflow against privilege or data-exposure risks. 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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