عرض عملي: تعديلات متزامنة باستخدام @Version

خطوة بخطوة

1. Add @Version to Product and include version in the response DTO.
2. Two clients fetch product 1 (version 3).
3. Client A updates the name with version 3 and succeeds (version 4).
4. Planned mistake: the update DTO omits the version, so the entity is loaded fresh and the conflict is missed. Fix: require the version in the request and compare it.
5. Client B updates with version 3: ObjectOptimisticLockingFailureException, mapped by @ControllerAdvice to 409 with the current version.
6. Write an integration test for the two-client conflict.

Prepares MID-016-LAB1.

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