GoogleDeveloperGroups/devfest-site — pull request #64 by helmuthb (2012-10-01 14:04:38+00:00)
Title: migration from reference to str-key (session)

This would migrate for the session entity all referenceproperties to strings.

Once this code is put into operation, it is necessary to go to http://www.devfest.info/migrate once which will do the migration and also clear the cache.
There are many bugs in this code, e.g. it only migrates the first 1000 sessions.
Additionally, whenever the sessions are updated all sessions get deleted and re-created instead of updated.