5802. Proxy & Routing: read-write split validation — Implement the workflow with safe SQL and application handling. — subscription billing — Java Spring/JDBC

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Scenario: A subscription billing application must handle read-write split validation. Implement the workflow with safe SQL and application handling. 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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