I had this same issue for a different section and tried the commands suggested here in the terminal; this didn’t work for me, I had an issue at step 3 of restarting postgresql. I had to delete the CodeAlly container, I was able to connect to the postgres after doing this. I think it will delete all your progress on the project, but if you save the files you worked with (and have a .sql file for your database) to your computer or github you should be able to add them to the project.