It is perfectly alright to have 0, 1, or more than one declarative base 
class (you will have 0 if you are using the ORM without the declarative 
extension). The only limitation I've found is that you have to use class 
attributes, not string table names, to reference foreign keys. e.g. 
ForeignKey(User.foobar) instead of ForeignKey('usertable.foobar_id')

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