Mnesia table changelog

[Leon Smith]

I want to be able to set up a Mnesia table so that it has CVS-like 
functionality.   I want to be able to go back and see what the table 
looked like at any point in time.     I need fast access only to the 
recent past,  I don't need fast access to arbitrary points in time.  

Also, for auditing purposes I'd like to be able to associate other 
pieces of information about the change,  such as who made the change.

I saw the checkpointing feature, but it doesn't sound appropriate to 
what I want to do.   What would work well would be a changelog that 
records the old and new values for each change to the database.  I could 
do this on an ad-hoc basis at the application layer,  but I'm curious if 
Mnesia already has functionality I could leverage.

best,
leon