Anyone know of a more automated system to handle forward/backward compatibility? Obviously, there's a lot of manual coding work that has to be done but is there a system that categorizes these various changes (schema or new URL for a page or change in backend service interface), automatically tracks and gets rid of these dependencies after a certain period of time? To give a concrete example, let's say I switched the Facebook messages URL to "/mail" from "/messages". I would mark the old handler as deprecated and eventually, after the new changes have been pushed to everyone, the system will prompt the developer to get rid of essentially the dead code. This is a very simplified example but I believe such deprecation tracking would be useful for more complex changes too.