Db migration and CLI bugfix

[dwreeves]

I've been testing this in production and aside from the bugfix I needed to do, it works.

We also have fully passing tests with a new test case, and unnecessary warnings are being handled properly.

====================================== test session starts ======================================
platform darwin -- Python 3.8.5, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /Users/wd/projects/flagging
plugins: schemathesis-2.8.4, hypothesis-5.41.5, cov-2.10.1, subtests-0.3.2
collected 15 items                                                                              

tests/test_api.py ...                                                                     [  5%]
tests/test_data.py ....                                                                   [ 29%]
tests/test_site.py ..........

====================================== 15 passed in 9.95s =======================================

[dwreeves]

I'll merge this into the dev branch, and sit on the merge to master.