Here is a blog article about what core functionality an ORM should
support:

http://pythonnotes.blogspot.com/2004/09/python-orm-tools.html

Specifically, take note of the paragraph that reads:

To implement true object persistence, each object needs a unique
identifier. Each ORM will use a different approach here. However, one
issue that is common to all ORMs is how to handle multiple copies of
the same object. For the sake of consistence, objects should be
singletons. If the ORM tool doesn't do it automatically, then it's up
to the programmer to make sure that no multiple copies of the same
object exist at the same time, avoiding concurrency and consistency
issues.


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