I have a class which inherits from Base. My class has a metaclass which 
inherits from DeclarativeMeta. Among other things, the metaclass adds an 
__init__ method to the class dictionary. When I instantiate an instance of 
my class directly, my __init__ method is invoked, but if I use the ORM to 
retrieve an instance, my __init__ method is not invoked. 

A metaclass serves better than a mixin for what I am trying to accomplish. 
However, I did experiment with a mixin and saw the same behavior as 
described above.

Any ideas? Many thanks.

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