systemd.services.hydra-prune-build-logs = {
    description = "Clean up old build logs";
    startAt = "weekly";
    serviceConfig = {
      User = "hydra-queue-runner";
      Group = "hydra";
      ExecStart = lib.concatStringsSep " " [
        (lib.getExe pkgs.findutils)
        "/var/lib/hydra/build-logs/"
        "-ignore_readdir_race"
        "-type"
        "f"
        "-mtime"
        "+${toString (3 * 365)}" # days
        "-delete"
      ];
    };
  };