Add the ability to quickly change database for all cards in a dashboard.

[gabgir]

Is your feature request related to a problem? Please describe. I use multiple databases in the same server instance that hold data under the same schema. As such, I use the same dashboard to visualize the data from all those databases. Right now, to switch between databases, I need to either edit all cards in my dashboard one by one, or export to json, edit the file, and import it again.

Describe the solution you'd like I would like an option, either in the left-hand side navigation menu or under the settings menu, to quickly change database for all cards in the dashboard.