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I was able to recover my disk (all file data and metadata) using btrfs-select-super utility to overwrite the primary superblock with a backup copy. As I thought, my disk originally didn't contain a partition table.

Because the size of my partition equal the size of the disk, I'm considering the possibility that I may have actually ended up formatting the disk with Disks (gnome-disk-utility) and creating one partition with the hole disk (without a partition table).

Running TestDisk and selecting partition type ...

In case it's useful, this is my annotation when I originally created the partition:

lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme1n1 259:0 0 1.8T 0 disk

sudo mkfs.btrfs -L achernar_data /dev/nvme1n1

btrfs-progs v5.16.2
See http://btrfs.wiki.kernel.org for more information ...

After installing Linux (Fedora 38) I inadvertently deleted the partition table of my second disk (NVMe). This disk contains one partition formatted with Btrfs using all the disk space.

Running TestDisk 7.2-WIP (as root) I was able to find the partition. The partition size almost matches the disk ...