nixos-config/nixos/profiles/services/vnstat/default.nix

{ config, mylib, ... }:
{
  services.vnstat.enable = true;

  environment.etc."vnstat.conf".text = ''
    UseUTC 1
  '';

  systemd.services.vnstat.restartTriggers = [ config.environment.etc."vnstat.conf".text ];

  systemd.services.vnstat.serviceConfig = mylib.misc.serviceHardened;

  preservation.preserveAt."/persist".directories = [
    {
      directory = "/var/lib/vnstat";
      mode = "-";
      user = "-";
      group = "-";
    }
  ];
}