We are using the django.db.backends.mysql database engine.
This is Dr. Chuck's reference implementation and simultaneously includes all the different versions that you will develop as you progress through the sequence of assignments. Here are the links to each implementation:
These links have a version number in them - for the student applications the marketplace will be at the top level url (i.e. "/").
You need to do each assignment and pass the autograder with full credit, before working on the next assignment. If you submit a later assignment to the autograder with "too many features" it will not be graded.