Like kich0 said, make sure you have shut down mangosd.exe and realmd.exe before making any changes to your server's database. Otherwise, MaNGOS will override your changes and set the values back. Also, make sure to save your changes or the database will not keep the new values. Once you have done this, you can restart your server and the edits should take effect.
Don't forget that CONSOLE must have the GM level. This is to prevent you from corrupting data by not allowing some commands to be executed from inside the game, only through the server's console window. As such, CONSOLE should be set to 8, Administrator would then be 7, and then the rest depend on however you assign the lower security levels.
It's most likely that you set .die to level 8, which should be CONSOLE only, and this prevents your Administrator level from using that command.