Sudoku ML black black . migration python manage.py makemigrations && python manage.py migrate Backup INITIAL and TEST DATA: python manage.py dumpdata board.Board -o db_backup/initial_data.json.xz python manage.py dumpdata board.Board -o db_backup/test_data.json.xz requirements pip install -U pip setuptools wheel pip-tools --timeout 60 pip-compile --upgrade requirements.in -o requirements.txt pip-compile --upgrade requirements_dev.in -o requirements_dev.txt -c requirements.txt pip-sync requirements.txt requirements_dev.txt --pip-args "--retries 10 --timeout 60"