{ config, lib, pkgs, ... }:

{
  nix = {
    # collect garbage between 5:15am and 6:00am daily
    gc = {
      automatic = true;
      dates = "5:15";
      options = "--delete-older-than 3d";
      randomizedDelaySec = "45min";
    };
  };

  system = {
    # run `nixos-rebuild switch --upgrade` between 3:15am and 4:00am daily
    autoUpgrade = {
      allowReboot = false;
      dates = "3:15";
      enable = true;
      randomizedDelaySec = "45min";
    };
  };
}