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Compares point-to-point queues with publish-subscribe topics and explains when each model fits.
Explains why message handlers must tolerate duplicate delivery and how idempotency protects side effects.
Keeps long-running queue work safe when message ownership expires, renewal fails, settlement is uncertain, or another worker receives the same job.
Explains when to store large payloads outside the broker and pass references through messages.
Explains when backend work belongs in a queue instead of slow or unreliable inline request handling.
Explains how multiple worker instances share queue work and what limits safe scaling.
Explains delayed delivery, scheduled work, reminders, retry timing, cancellation, and clock-related trade-offs.