# n8n integration

## Role

n8n orchestrates secondary cross-system work after MobilityOps commits canonical state. It is not the domain engine.

## Required live workflow: return processing

Input: `vehicle.returned.v1` webhook event.

Steps:

1. validate event type and schema;
2. derive a follow-up category from the already-calculated state;
3. call the narrow MobilityOps callback endpoint with event ID and follow-up summary;
4. return a stable workflow result;
5. on errors, fail visibly so the outbox dispatcher can retry.

The starter export is `n8n/mobilityops-return-processing.json`. Claude may correct its credentials and callback route but must preserve idempotency.

## Optional second workflow: knowledge sync

Input: manual trigger or manifest-changed event.

Steps:

1. read the fixed knowledge manifest;
2. call RAGcore ingestion/sync API;
3. record per-document results through MobilityOps integration status API.

This workflow is useful but must not delay the core demo if RAGcore's final API is not ready.

## Outbox dispatcher

- polls pending records;
- claims with `FOR UPDATE SKIP LOCKED` or equivalent;
- sends event with timeout;
- exponential backoff with a small maximum attempt count;
- supports explicit manual retry;
- preserves last error and response metadata;
- does not hold a database transaction open during network I/O.