Postgresql – Keeping version history of functions in PostgreSQL

For many of my tables, I've added auditing triggers (based on this wiki page). It works very well and has helped me several times figure out who changed what in the system. We have a Python/Django application that sits on top of the data and that code is tracked in Git. However, there seems to be one area of our system where changes are not tracked very well. And that's the function/triggers, etc in PostgreSQL. I wish there was a way I could add a similar audit capability to the schema as I have with the data itself.

How do DBA track these changes? Note: I'm in a position where there is more than one person with sufficient privileges to "CREATE OR REPLACE" a function, so I can't necessarily count on a person to write a script and check it into Git and I certainly can't force them. If possible, it needs to be automatic.

I've thought about writing a python script to "create" a script file and write it to a file and then programmatically commit changes to a git repo.

Another option would be to add some tables to my audit schema and just query each night and look for changes and right them to a table. Certainly could work, but not quite as nice as being able to do a diff/blame via git.

This may not be the greatest question because I'm not exactly sure what I'm looking for and there may not be an exact "right" answer, but I would like to know what people do. I've done some "googling" on the topic, but I'm not finding a lot (maybe I'm just using the wrong terms).

Finally, I'm currently using PostgreSQL 9.1.