AssertionError: Models and migration scripts aren't in sync:
    [ [ ( 'modify_default',
          None,
          'compute_nodes',
          'mapped',
          { 'existing_nullable': False,
            'existing_type': INTEGER()},
          DefaultClause(<sqlalchemy.sql.elements.TextClause object at 0x7f94115240d0>, for_update=False),
          DefaultClause('0', for_update=False))]]