عرض عملي: فقدان حدث دون outbox

خطوة بخطوة

1. Start orders, Kafka, and a consumer log; place an order and see the event arrive.
2. Add a Thread.sleep (or a kill hook) between repo.save and kafka.send.
3. Place an order and kill -9 the service during the pause; restart and check: the order exists, no event ever arrives.
4. Planned mistake: "fix" it by moving send inside @Transactional and repeat the kill. The event is still lost (or sent for a rolled-back order). Fix: it is the same dual write.
5. Add the outbox table and relay; repeat the kill and watch the event arrive after restart.