Hi @dan.kainz -
It sounds like you could be looking for 1 of 2 things.
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If you need to update the DataSource connection properties you can follow the steps outlined here Editing a database data source.
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Updating the DataSource used by a DataSet. This is not currently possible in the UI.
As a workaround, you can update the DataSet using the QuickSight API.
The rough process;
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DescribeDataset
a. Update the property DataSourceArn to your new DataSource Arn - UpdateDataset