{
  pkgs,
  config,
  lib,
  ...
}:
let
  service = "keepalive";
  cfg = config.system.${service};
in {
  options.system.${service} = {
    enable = lib.mkEnableOption "enables ${service}";
    url = lib.mkOption {
      type = lib.types.str;
      default = "";
      description = "url to ping for uptime-kuma keepalive";
    };
    interval = lib.mkOption {
      type = lib.types.str;
      default = "60s";
    };
  };

  config = lib.mkIf cfg.enable {
    systemd.services.keepalive = {
      description = "send push for uptime kuma heartbeat";
      serviceConfig = {
        Type = "oneshot";
      };
      script = ''
        ${pkgs.curl}/bin/curl -fsSk \
          "${cfg.url}" \
          >/dev/null
      '';
    };

    systemd.timers.keepalive = {
      wantedBy = [ "timers.target" ];
      timerConfig = {
        OnBootSec = "30s";
        OnUnitActiveSec = cfg.interval;
        Unit = "keepalive.service";
      };
    };
  };
}