Release note for using "passive_deletes=True"
Related-Bug: #1757966 Change-Id: I013d4837603839364f8d699f7ce97e4400879d38
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fixes:
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Used "passive_deletes=True" in the configuration of relationships in
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SQLAlchemy models. This improves deletion of graphs of related objects
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stored in DB because dependent objects don't get loaded prior to
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deleting them.
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More about using this flag can be found at:
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http://docs.sqlalchemy.org/en/latest/orm/collections.html#using-passive-deletes
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