I wasn't so lucky since I had everything as one big BTRFS filesystem. I did recover it by booting the installer in recovery mode, mounting the fs read-only, an

I wasn't so lucky since I had everything as one big BTRFS filesystem. I did recover it by booting the installer in recovery mode, mounting the fs read-only, and doing a backup. Then I blew away the partition table and reinstalled. I also learned a lesson about backups, mainly that I should have them.