Django: Database constraints

[jchristgit]

Django 2.2 will bring support for adding database constraints to models, which is insanely useful. Once that's released, we should add constraints to our data to enforce integrity at the database level.

https://docs.djangoproject.com/en/dev/ref/models/options/#django.db.models.Options.constraints

[Den4200]

This doesn't seem relevant anymore.