{ nix = { settings = { trusted-public-keys = []; experimental-features = [ "flakes" "nix-command" ]; auto-optimise-store = true; fallback = true; builders-use-substitutes = true; }; gc = { persistent = true; dates = "weekly"; options = "-d"; randomizedDelaySec = "5h"; }; optimise = { dates = []; automatic = true; }; }; }