docs: Fix db-schema.svg generation to use pifpaf-created database
This makes 'tox -e sphinx-dev' not rely on the existence of the database on the system.
Migrated from D5499 (view on Phabricator)
Staging instance, all changes can be removed at any time
This makes 'tox -e sphinx-dev' not rely on the existence of the database on the system.
Migrated from D5499 (view on Phabricator)