The model_query call results in a nested read transaction, that does not
seem to play well with SQLite support. Since it's inherently relying on
the query style deprecated in SQLAlchemy 2.0, we need to migrate away
from this call. As an intermediate step, change instances of model_query
to session.query, making sure every call creates a session that lives
as long as is needed to fetch the results.
Removes a unit test which was built around creating
a fake deadlock condition to test that oslo_db was working
as expected. It's interaction was totally mocked, and in
retooling the base method there was no easy to keep
the same test logic around.
Co-Authored-By: Dmitry Tantsur <dtantsur@protonmail.com>
Change-Id: Ic8b1d964f7be5784e01c89bfb6c0277ea82eec2d
5d5ae59538