The delivery worker processes queued rows and applies status-based retry logic without blocking core lead workflows.
Processing states
pending -> waiting for first attemptfailed -> retry scheduleddelivered -> terminal successabandoned -> terminal failure after retry policy or immediate 4xx
Response handling
| HTTP Response | Action |
|---|
2xx | mark row delivered |
4xx | mark row abandoned immediately |
5xx or timeout | mark row failed, increment attempts, schedule retry |
Retry schedule
| Attempt | Delay after previous |
|---|
| 1 | Immediate |
| 2 | 1 minute |
| 3 | 10 minutes |
| 4 | 1 hour |
| 5 | 4 hours -> abandoned |
Worker row selection and guarded updates must both accept pending and failed statuses so successful retries can transition failed rows to delivered.
