Hi Dmitry.
You don't need to call the Base constructor, it's just a convenience
feature:
http://www.sqlalchemy.org/docs/orm/extensions/declarative.html#class-constructor
For doing stuff on delete, check out the ORM event API, specifically the
before_delete and after_delete events:
Thanks a lot, this is exactly what i was looking for !
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Dmitry Guryanov
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