Nice meme!
So instead of forking the volume, can you try restoring from a snapshot?
it’ll be very similar to forking but… from a snapshot 
This is one command, in one line. It will create a new app - it won’t touch the existing volumes or snapshots.
fly postgres create --name new-db --vm-size shared-cpu-2x --volume-size 10 --initial-cluster-size 1 --region CHOOSE --org your-org --image-ref registry-1.docker.io/flyio/postgres:13 --stolon --snapshot-id vs_yaddayaddayadda
One other question - this app does not appear to have been created with fly postgres, am I right?