nixos-config/hosts/midas/filesystems/default.nix

{ ... }:
{
  fileSystems."/persist" = {
    device = "/dev/disk/by-uuid/acf95700-8669-45c7-9a72-bf3215b3c325";
    fsType = "btrfs";
    neededForBoot = true;
    options = [ "subvol=persist" "compress=zstd" "noatime" ];
  };
}