nixos/modules/base/gc.nix

_: {
  boot.loader.systemd-boot.configurationLimit = 10;

  nix.gc = {
    automatic = true;
    dates = "weekly";
    options = "--delete-older-than 7d";
  };

  nix.settings.auto-optimise-store = true;
  nix.optimise.automatic = true;
}