{
  den.aspects = {
    base = {
      nixos =
        { pkgs, ... }:
        {
          programs = {
            nh = {
              enable = true;
              clean = {
                enable = true;
                extraArgs = "--keep 2";
              };
            };
          };
          environment.systemPackages = [
            pkgs.nix-output-monitor
            pkgs.nvd
          ];
        };
      };
    };
}