CQRS: when the user saves and cannot see their own data
Separating reads from writes solves a pile of problems and creates a new one, which shows up on the user's screen and arrives as a support ticket.
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Circuit Breaker: isolating failures before they spread
How Circuit Breakers help contain failures, protect resources and make applications more resilient.
Outbox and a choreographed saga: four services closing one payment
No database transaction spans four services. What changes when the event is written in the same transaction as the state, and compensation becomes the job of whoever started the saga.