It's not 100% specific to flux, but with the new V3 code base, the way in which the database is managed is changing. I've detailed the approach and the tools in these two posts on my blog;
The approach:
http://www.deepcode.co.uk/archive/2008/06/19/database-schema-in-source-control.aspx
The tools and source:
http://www.deepcode.co.uk/archive/2008/07/02/database-schema-and-source-control-the-tools.aspx