nixos-config/home-manager/profiles/valent/default.nix

{ pkgs, ... }:
{
  home.packages = with pkgs; [ valent ];

  systemd.user.services.valent = {
    Unit = {
      PartOf = [ "graphical-session.target" ];
      After = [ "graphical-session.target" ];
      Requisite = [ "graphical-session.target" ];
    };
    Service = {
      ExecStart = "${pkgs.valent}/bin/valent --gapplication-service";
      Restart = "on-failure";
    };
    Install.WantedBy = [ "graphical-session.target" ];
  };

  preservation.preserveAt."/persist".directories = [ ".config/valent" ];
}