When working with critical data that need to consistent and need to accurate to catch all requests.

▪ When the database update and sending of the message should be atomic to make sure data consistency.

▪ For example the order sale transactions, because they are about financial business. Thus, the calculations must be correct 100%.

▪ To access this accuracy, must be sure that our system is not losing any event messages.

▪ The Outbox Pattern should be applied this kind of cases

https://microservices.io/patterns/data/transactional-outbox.html