Update drill

Do :

1. stop all your instances
2. pull latest develop
3. pip3[.6] install -r requirements.txt -U
4. make sure sightings and sightings_users are not overloaded. (do cleanup if you have millions of rows)
5. alembic upgrade head
6. restart scan.py
7. python3[.6] cleanup.py -sc (Unix only. For Windows, refer to Cleanup wiki)

Important

• If you skipped steps 1. and 4., step 5. might take a long time and sometimes result in migration failure.
• 7. is only needed once per DB.