{ config, pkgs, ... }: {
  systemd.services.auto-shutdown = {
    description = "Automatic daily shutdown at 9:30 pm";
    serviceConfig = {
      Type = "oneshot";
      ExecStart = [ "${pkgs.systemd}/bin/systemctl poweroff" ];
    };
  };

  systemd.timers.auto-shutdown = {
    description = "Timer for daily shutdown at 9:30 pm";
    wantedBy = [ "timers.target" ];
    timerConfig = {
      OnCalendar = "21:40";
      Persistent = true;
    };
  };
}