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You're right on that one, it's no where in the documentation. 
There are more such properties which are needed, but not 
saying it anywhere (don't try to remove the author prop from 
the msg class). It would indeed be nice if there would be a 
remark about these properties somewhere in the 
documentatin or as comment in the dbinit.py file. Or maybe 
even better, roundup to define new base classes for 
UserClass, and so on... The base classes must contain all 
required fields (and so can not be removed by us). In 
dbutils.py we that inherrit the base class and add our own 
properties.

Regards,
Marlon