I have a simple foreign key relationship between a Task class and a Context class, where many Tasks can have the same Context. The default value for the Task foreign key context_id is 0. When I delete a Context, the Tasks with that context have their context_id automatically set to None and I would like it to be set to 0. (I believe this is the default cascade behavior as I do not have any cascade set on the mapper.) Right now I then explicitly change each affected Tasks context_id to 0. Do I have to do this explicitly, or is there a way on delete of a Context to have the task updated to a context_id = 0. Thanks for any advice.
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