I was working on my code and tried to run a migration against a my local database. Migration couldn't be applied but this folder was created:

Soon after, my whole solution couldn't be loaded and I cannot still delete this folder. What do I do? Where did it come from?
I tried the following:
1) Reboot
2) Safe boot
3) Open CMD with administrator rights and run rmdir "'.." but that gives me an error stating that such path doesn't exist