RCM

MVP: payload → processed_events → grid_metrics → API → map

Grid metrics (from API)

{
  "metrics": [
    {
      "key": "event_count",
      "value": 1,
      "computedAt": "2026-05-19T18:03:00.989Z"
    }
  ],
  "db": {
    "ok": true
  }
}