# Resolve a structured-load backfill start

Resolve the backfill start for a structured-load task.

```text
POST https://moi.matrixorigin.cn/newmoi/connectors/structured/v1/source/backfill-start/resolve
```

## Before you call

Confirm the structured data source and backfill method. Prepare a personal access token, workspace ID, and connector ID.

## Request example

```bash
curl -X POST "https://moi.matrixorigin.cn/newmoi/connectors/structured/v1/source/backfill-start/resolve" \
  -H "X-API-Key: $AI_STUDIO_API_KEY" \
  -H "X-Workspace-ID: $WORKSPACE_ID" \
  -H "Content-Type: application/json" \
  -d "{
    \"connector_id\": \"$CONNECTOR_ID\",
    \"source\": {\"connector_id\": \"$CONNECTOR_ID\", \"source_type\": \"SOURCE_TYPE_MYSQL\", \"database\": \"appdb\", \"schema\": \"public\", \"table\": \"orders\"},
    \"start_mode\": \"auto\"
  }"
```

## Request body

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `connector_id` | string | Yes | Connector ID. |
| `source` | object | Yes | Structured data source, including type, database, schema, and table information. |
| `watermark` | object | No | Watermark configuration used to resolve the backfill start. |
| `start_mode` | string | Yes | Backfill start mode. |
| `custom_start_value` | string | No | Custom backfill start; provide it when applicable. |

## Successful response

A successful response returns a backfill start that can be used to create a structured-load task.

## Error response

If the data source or backfill mode is invalid, check the connector and `source` configuration, then retry.