Closes the silent-loss hole in outbound webhook delivery. The worker
in src/webhooks.rs retries failed deliveries with exponential backoff
up to 10 attempts, then sets next_attempt_at = NULL and walks away.
Pre-this-commit, those "dead-lettered" rows sat in webhook_deliveries
forever with no surface for the operator to discover, inspect, or
recover from them — a subscriber that was down for >6h during a
license-issuance burst would silently lose those events forever.
What's new:
- repo::DeliveryStatusFilter — enum with parse() so query strings
map cleanly to SQL predicates.
- repo::list_deliveries — endpoint_id + status + limit, newest first.
- repo::requeue_delivery — resets attempt_count=0, clears delivered_at
and last_error, sets next_attempt_at=now. The worker picks it up on
the next 5s tick.
- src/api/webhook_deliveries.rs — admin module with two handlers:
- GET /v1/admin/webhook-deliveries?endpoint_id=…&status=…&limit=…
- POST /v1/admin/webhook-deliveries/:id/retry (audit-logged as
webhook_delivery.retry; 404 on missing id)
- Routes registered in src/api/mod.rs alongside the existing
webhook_endpoints CRUD.
- tests/api.rs gains webhook_dlq_lists_failed_and_retry_requeues:
seeds three deliveries directly via SQL (one each: delivered,
pending, dead-lettered), exercises the list filter, runs the retry,
asserts the row migrates from failed→pending, audit row is written,
404 on bad id, 400 on bad status filter.
Worker code is unchanged. The DLQ is operator-actionable infrastructure
on top of the existing retry semantics.
Test count: 23 (9 unit + 4 migration + 10 API), up from 22.
Grant