Idempotency Keys: Make POST Endpoints Safe to Retry
K
Kodetra Technologies··9 min read Intermediate Summary
Build a Redis + Postgres idempotency layer that survives retries, races, and crashes.
Why this matters now
Every backend engineer eventually hits the same nightmare. A user taps "Pay" twice on a flaky 3G connection. A mobile client retries a request after a 30-second timeout. A queue worker re-runs a job because Kubernetes killed the pod between the database write and the ACK. The result is the same: duplicate charges, duplicate orders, duplicate emails, duplicate everything.
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