The installation and use of the UniREST Server plugin generate new Database tables and files in the UniREST Server environment.
Practically, in this way, the Database tables and the UNIREST folder continue to exist in your Server. This will offer you the opportunity of removing and reinstalling the UniREST Server plugin, and find your tables and APIs again in the UniREST environment.
Full uninstall
Instead, if you need to remove the plugin and all the related items (tables, files and so on), you have to perform a full uninstall.
Simply go in the UniREST Server Settings panel and click the [RESET] button.
The UniREST Server will ask you a confirmation twice and then it will remove both the generated Database tables and the UNIREST folder.
Now, you can uninstall the plugin with the WordPress default procedure.