Improve db query performance

src/videoag_common/api_object/object.py

src/videoag_common/database/base.py

src/videoag_common/database/drift_detector.py

src/videoag_common/objects/changelog.py

src/videoag_common/objects/course.py

src/videoag_common/objects/job.py

src/videoag_common/objects/medium.py