title: Duplicate a Superset dashboard, then replace its dataset source at once?
body: <p>I am using Superset for data visualisation and I'm used to upload a csv file for each dataset I need. My issue is when I want to duplicate a dashboard and replace the datasource only for the copied dashboard. In practice I export the dashboard that I want to copy, then import it, and change the dataset for each graph of the dashboard. This task can be quite time-consuming and I would like to know if there is any way to change the dataset source in the duplicated dashboard for all its graphs at once?</p>