Allow option to prompt before executing production queries.
I love that you allow users to flag production connections and you make it visually obvious when a production database is being used.
A configurable option (even if the default is off) to present the user with a simple "OK"/"Abort" confirmation dialog before executing a query against a production database could serve to save users from terrible mistakes. I am very grateful that I myself have not made this mistake, but it would be a very easy thing to do that could be avoided with a couple of lines of validation.
One could recommend that query authors write this into their queries, but that would not help when working SQL for example.