One great feature is "Run SQL query"
The instructions say:
This allows you to run basically any command you want on the database (useful for fixing things you messed up), use #__ for your database prefix (e.g. "SELECT * FROM #__online") also use a ; at the end of each query when running multiple queries, linebreaks are irrelevant. WARNING: only use this if you know what you are doing, messing with it could trash your database!
Is this something that is already available in the core or as an addon that I don't know about? I searched like crazy and couldn't find anything.