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API Idempotent Consumer Pattern
Process messages exactly once enough
An idempotent consumer stores processed IDs or states, checks before applying work, and structures writes to avoid duplicate side effects when messages are retried or delivered multiple times.
- idempotent consumer
- deduplication
- messages
- retries
- state
Track IDs
Store message IDs or hashes to skip repeats.
Check State
Read current state before applying changes; use UPSERTs.
Design Writes
Make handlers idempotent; use transactions where possible.
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