How does CQRS work in distributed systems? A practical guide to domain events, message brokers, projections, Outbox, idempotency, and eventual consistency.
How does CQRS stay safe in production? Consistency lag, duplicate events, reordering, projection recovery, retries, DLQs, and Saga strategies.
Idempotency isn't one header. It's a defense stack that has to be built separately across five layers, from the API key down to the step marker.
Exactly-once messaging is a lie. How defense in depth — idempotency, dedup, outbox, and reconciliation — produces an effectively-once business outcome.
