{
  nix.gc = {
    automatic = true;
    dates = "weekly";
    options = "--delete-older-than 30d -d";
  };
  nix.extraOptions = ''
    min-free = ${toString (100 * 1024 * 1024)}
    max-free = ${toString (1024 * 1024 * 1024)}
  '';
  nix.optimise.automatic = true;
  nix.optimise.dates = [ "03:45" ];
}