@84 on the Demokritos trunk now has full persistence of members and collections into a subversion repository.
At the moment there's no caching (so subversion gets hit every request) and transactions are overly granular. As a result, performance isn't great. But it seems to work!
The original post was in the categories: python subversion atompub demokritos but I'm still in the process of migrating categories over.
There may be broken links to media on this page. I'm still in the process of migrating them over.