as it is collection files are stored in the collection.db file in the osu! folder then when they're deleted they're thrown out of the file with no possible way to recover them. collections aren't their on individual files and that's what makes recovery impossible unless you backed up your collection.db file. i think this is a rather stinky way of doing things. beatmaps are their own individual files, making it easy to immediately restore a deleted beatmap via going into the recycle bin on your pc and restoring the file. why not have collections be a folder of compressed individual collections for easy restoration?
or better yet, give us some in-game recycle bin where deleted things get actually deleted after a certain period of time.
or better yet, give us some in-game recycle bin where deleted things get actually deleted after a certain period of time.