With the Doka control panel you can run simple SQL scripts or T-SQL batches on your database. You can also run T-SQL batches stored in files.
To run a script, in "User menu" navigate to "User -> MS SQL -> Databases -> (Database name) -> Run Scripts -> Open T-SQL Console"
Type in or paste the SQL batch in the textbox and click on the "Execute T-SQL" button.
You may also run T-SQL scripts stored in your "backup location" or you'll be able to upload and execute new scripts immediately.