I stupidly went and deleted a really important playlist in Rekordbox 6. I know there is no way to restore it without having created a backup (which I don't have).
Is there still a way to rollback rekordbox to a previous state using the system files, as described in one of older threads?
There is an automatic backup being made when you close rekordbox. Each time you CLOSE rekordbox it will add a backup and remove the oldest. It will rotate 3 backups.
So if you have not closed rekordbox more than once (or twice) there should be one of those auto-backup left you might be able to restore.
Unfortunatly you probably have closed rekordbox more than 3 times by now. In that case there is no way to get your playlist back.
Please take the lesson from this and make regular backup in the future.
Location of this folder :
Alternatively you might be able to re-import this playlist from a device you exported it to previously. If this playlist is still on one of your devices, insert it and run rekordbox. You are then able to navigate the device and browse to the proper playlist. Then right click it (or CTRL click) and choose 'Import Playlist'.
All things written in this previous topic still apply : Rekordbox - Recover deleted playlists