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Compares point-to-point queues with publish-subscribe topics and explains when each model fits.
Explains useful message metadata for tracing, idempotency, ownership, versioning, and support diagnostics.
Explains how systems behave when the broker is down or slow and how backpressure protects callers and dependencies.
Explains how to reprocess event streams safely for new projections, bug fixes, and data repair.
Explains command messages versus event messages and how ownership changes their design.
Explains why exactly-once claims do not remove the need for idempotent side effects and consistency boundaries.
Explains event schema evolution, backward compatibility, additive changes, consumer rollout, and contract ownership.