> For the complete documentation index, see [llms.txt](https://developer.abacum.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.abacum.ai/guides/import-api-guides/override-and-re-load.md).

# Override and re-load

Load new months, or replace the data for chosen months.

The `override` field decides what happens to the data already in the dataset.

| `override`        | Result                                                                                                                                                         |
| ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `false` (default) | Abacum loads the file only if no month in `months` has data yet. If any month already has data, the request returns `400` and Abacum loads none of the months. |
| `true`            | Abacum replaces the data for the months in `months` only. Other months do not change.                                                                          |

Use `override: true` after a correction, or for a full re-run of a period.

{% hint style="warning" %}
If any month in `months` already has data and `override` is `false`, the request returns `400`. Abacum loads **none** of the months in the file. The response body is:

```json
["A load with the same dates already exists. Please delete it before or replace data."]
```

To re-load, set `override` to `true`. Or send the months that already have data in a separate request, with `override` set to `true`.
{% endhint %}

## Examples

| You want to                           | `months`                        | `override` |
| ------------------------------------- | ------------------------------- | ---------- |
| Load a new month                      | `2026-04`                       | `false`    |
| Correct a month that already has data | `2026-03`                       | `true`     |
| Re-run a full quarter                 | `2026-01`, `2026-02`, `2026-03` | `true`     |