More details are here: 
http://groups.google.com/group/sqlelixir/browse_thread/thread/aac5d22702e3a8ec

But basically, I have a relationship between a parent (Item) table and
child (Link) table.  When I try to delete an Item, an SQL statement is
generated by SQLAlchemy that tries to set Link.item_id = NULL.  That
is invalid, because Link.item_id is a NOT NULL column and also because
I have a FK on the column.  I have tried adjusting the cascade options
to no avail.

I would *really* appreciate some help on this, it is caused me to come
to a grinding hault on a project I am working on that needs to be done
by the end of the week.

Thanks!
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