You might want to consider following the Rails-style database migration concept, whereby as you are developing you provide roll-forward and roll-back SQL statements that work as patches, allowing you to roll your database to any particular revision state that is required.
Of course, this is typically meant for dealing with schema changes only (i.e. you don't worry about revisioning data that might be dynamically populated into tables.). For configuration tables or similar tables that are basically static in content, you can certainly add migrations as well.
A Google search for "rails migrations for python" turned up a number of results, including the following tool: