docs: public void setupKeys()
      {
          KeyAreaInfo keyArea = null;
          keyArea = new KeyAreaInfo(this, Constants.UNIQUE, ID_KEY);
          keyArea.addKeyField(ID, Constants.ASCENDING);
          keyArea = new KeyAreaInfo(this, Constants.UNIQUE, KEY_FILENAME_KEY);
          keyArea.addKeyField(KEY_FILENAME, Constants.ASCENDING);
          keyArea.addKeyField(KEY_NUMBER, Constants.ASCENDING);
      }