<!-- source: https://secondlayer.tools/docs/api-reference#subgraph-operation-queued-object -->

## The Queued operation object

A reindex or backfill accepted into the queue.

| Field | Type | Description |
| --- | --- | --- |
| `message` | string | One-line summary. |
| `fromBlock` | integer | First block. For a reindex, the subgraph's start block. |
| `toBlock` | integer | Last block. For a reindex, the string `"chain tip"`: it runs to whatever the tip is when it gets there. |
| `operationId` | string · uuid | Poll `/api/subgraphs/{name}/operations/{operation_id}`. |
| `status` | enum | Always `queued`. Values: `queued`. |

```json
{
  "message": "Backfill queued for subgraph \"sbtc-flows\"",
  "fromBlock": 8950000,
  "toBlock": 9000000,
  "operationId": "9a4e7c21-0b3d-4f6a-8c15-e2d7b9f0a461",
  "status": "queued"
}
```