rather than making an end run around modularity, you ought to be able to do this whole change with just this line:

'''default='CrashData: postgresql, '

if you look at .../fs/crash_data.py, you can see that it would work with any crash storage implementation. At if line 40 were written to be generic.  At least that's how I wanted the design of this to work.  

I'm not here, I wrote this in the future and sent it back to the past so that you'd see it today...