Hi, for unit tests i need to create class with *Base.metadata.create_all*, 
and delete table defintion (for tests)

On second definition i have a error (already defined)

With use *Base.metadata.clear *i get *warning*

SAWarning: Reassigning polymorphic association for identity 
'testparentclass' from <Mapper at 0x7f910d43c2b0; TempCreatedTestParent> to 
<Mapper at 0x7f910d83f860; TestParentClass>: Check for duplicate use of 
'testparentclass' as value for polymorphic_identity.

Can i clear cached inherit?

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