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# What's new in Sigma

> Sigma release notes for Feb 7, 2025: Audit logs now available in us-east-1 region, swap link sources for datasets, and more.

## Admin

### Audit logs now available in us-east-1 region

Organizations hosted in AWS us-east-1 are now able to access the Sigma Audit Logs connection, which records data related to user-initiated events that occur within your Sigma organization. The connection is disabled by default, but an Admin user can enable it in the Administration portal.

See [Enable audit logging](https://help.sigmacomputing.com/docs/enable-audit-logging).

## API

### Swap link sources for datasets

The [Swap workbook data sources](/reference/source-swap-workbook) endpoint (`POST /v2/workbooks/{workbookId}/swapSources`) now includes the option to swap dataset links. When using the `sourceMapping` option, the `columnMapping` option supports specifying a link name and linked column name to swap from one dataset link to another dataset link.

For example, to change the source for a workbook from one dataset link to another, set the `fromId` and `toId` to the same dataset ID, but update the `fromColumn` to the name of the previous dataset link and linked column name and the `toColumn` to the desired dataset link and linked column:

```json
{
    "sourceMapping": [
        {
            "fromId": "bfa59799-69c7-423d-b965-7319cbfc2ebb",
            "toId": "bfa59799-69c7-423d-b965-7319cbfc2ebb",
            "columnMapping": [
                {
                    "fromColumn": ["Link name", "Missing column name"],
                    "toColumn": ["Link name", "New column name"]
                }
            ]
        }
    ]
}
```

## Workbook elements

### Freeze columns in pivot tables

Pivot tables now support the ability to freeze or unfreeze the position of columns.

For more details, see [Format column location in a table](https://help.sigmacomputing.com/docs/format-and-customize-a-table#format-column-location-in-a-table).

## Workbook features

### Schedule exports as an email burst (GA)

You can send a custom-filtered report to a dynamic list of recipients as a scheduled email burst. Send a workbook, workbook pages, and individual workbook elements as supported attachment types, such as PDF, Excel, or PNG files.

For more details, see [Export as email burst](https://help.sigmacomputing.com/docs/export-as-email-burst).

### Set conditional exports to alert a specific number of times (Beta)

Limit the number of conditional exports by setting the frequency of an export to send only a given number of times per day, per week, or all time.

For example, a conditional export that sends an email when there is data in a table can be set to alert once per day.

### Customize chart and formatting color scales (GA)

Create custom color scales to use when formatting chart colors or conditional formatting for tables. Create a custom color scale for an organization theme, workbook theme, or for a specific data element.

For more details, see [Add a custom color scale](https://help.sigmacomputing.com/docs/add-a-custom-color-scale).