# contractorOps.history.rateBackfill.preview

Preview imported timesheets missing a source amount and rate, with the active hourly agreement covering each complete period. Shows which weeks are ready to save and which need review because an agreement changes, is missing, or has a currency or rate conflict. No data changes and no payout is prepared.

`GET | POST /api/v1/accounting/contractorOps.history.rateBackfill.preview`

Permissions: `accounting:read` · Roles: admin

MCP tool: `accounting_contractor_ops_history_rate_backfill_preview`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `contractorId` | string (ID) |  | The ID of a contractor, from contractors.list. |
| `from` | string (date) |  | The first date to include, as YYYY-MM-DD. |
| `to` | string (date) |  | The last date to include, as YYYY-MM-DD. |
| `limit` | integer |  | How many results to return at most. 1 to 500. Default `100`. |
| `offset` | integer |  | How many results to skip, for the next page of a list. 0 to 100000. Default `0`. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/contractorOps.history.rateBackfill.preview \
  -H "Authorization: Bearer $OATMILK_API_KEY"
```

Reference page: https://app.getoatmilk.com/docs/api/contractorOps.history.rateBackfill.preview