-- When you make a sql change, create a folder for the version number this change is part of. 
-- So version 2.10.4.5 would be folder 21045.
-- The sql file can be called whatever you like, as long as it ends ".sql", make it relevant so someone else can at a glance see what it is.
-- Afterwards http://localhost/admin/dbv-1.1/index.php will show the folder name as a "revision". 
-- When revisions are checked and "run selected revisions" is clicked, all the .sql files in those selected folders will be run on the database.