Fix migrations

[renatobellotti]

Problem: It is not possible to apply all migrations (from 3rd party apps).

The problem exists at least since commit 3eca7108bd093f9c42b7940748f38f5ab54048ea.

Ways to reproduce:

• docker-compose up
• delete database (DROP DATABASE tq_website;)
• create new, empty database (CREATE DATABASE tq_website;)
• scripts/makemigrations.sh
• scripts/migrate.sh
• script/makemigrations --> error message: Models are out of sync with database.

What might help: Delete the last 4 lines in courses/migrations/0035.... (was manually adjusted; perhaps to remove remaining db entries from a former dependency mughsot?)

Suggested process: I suspect that somebody forgot to create migrations after heavily changing some model(s). Therefore: Find latest working commit. Manually adjust the next migrations to be in sync again with the models.

[renatobellotti]

Has already been solved (solution).