usually this happens due to the need to `mark_changed`, but that is
definitely not at play in here.
a stupid debug trick that i've been using for similar issues is to do this:
session.execute("Select True; -- possible failure A | START" );
session.add()
session.execute("Select True; -- possible failure A | after add" );
session.add()
session.execute("Select True; -- possible failure A | after commit" );
there's a tiny performance hit, but you basically get debug statements in
SqlAlchemy AND PostgreSQL. That's really helped me figure out where errors
happen.
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