Learn SQL by Building a Student Database: Part 1 - Build a Student Database: Part 1

I quit the challenge halfway the other day and started it today noticing that my progress was gone. I restarted the course and continued with it until it got to a point where I was prompted to view the tables using the \d command. Every time I needed to do this the site would would not be able to progress (loading screen - see screenshot) and now even after reloading the page, it is still loading. Is there a way to completely reset this course and/or to get my old progress back?

Challenge: Learn SQL by Building a Student Database: Part 1 - Build a Student Database: Part 1

Link to the challenge:

The problem still persists. Does anyone have a solution?