backupify/cassandra_datum — pull request #14 by ericalexander (2013-12-12 18:43:40+00:00)
Title: Only set the type if it is not provided.

This is needed for the high watermark migration. I need to convert BackupRun to GoogleMailBackupRun in order to get the low_watermark attributes. This allows me to update the type attribute without it being replaced by the class name.