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📜 WAYPOINT LESSON

Checkpoint: Persistence

⭐⭐ intermediate⏳ 15 min read📍 Lesson 105 of 180

Graded checkpoint: an idempotent outbox store with ordered draining and exactly-once delivery.

Checkpoint — persistence

You can now: design repositories that make storage swappable, keep derived indexes consistent on every write, and explain the JDBC contract your production implementation would honor. Prove it with a transactional outbox.