- Use Prisma $transaction with Serializable isolation level
- Insert idempotency record FIRST, then execute business logic
- Unique constraint violation (P2002) indicates duplicate event
- All operations atomic - either fully commit or fully rollback
- Modified all handlers to accept transaction client parameter
- Removed old non-atomic isEventProcessed/recordProcessedEvent methods
This ensures 100% data consistency for CDC synchronization, which is
critical for financial data where any error is catastrophic.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
hailin
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