I am slowly working on something for me to keep track of stuff that I modify.. somewhat like this.
I have it where it is kept in another table that I just use a easy submit form.. with text boxes for me to fill in. lol
like Hack Name, Last Modified, Creator, Files Modified, Templates Modified, New Files, New Templates.
and I just fill in the rest.. and go from there.
It helps, so I don't accidently forgot to upgrade or intergrate some code.. like from a file I might have just put one line of code in or changed just some letter around.
I just use it in my admin panel, and I print it out when it comes time to updating