Background Jobs and Exactly-Once Semantics: What Rails Can (and Can’t) Promise

Sidekiq delivers at-least-once. “Exactly-once” is something you design with idempotency and clear product language.

What you'll learn

• How to explain retries to finance and compliance
• Outbox-ish patterns without buzzword bingo
• When duplicate jobs are harmless vs catastrophic

Next steps

Write your idempotency rules where money moves—then tune workers.