docs: protected static DatabaseEntry getDatabaseEntryKey(WebURL url) {
          byte[] keyData = new byte[6];
          keyData[0] = url.getPriority();
          keyData[1] = ((url.getDepth() > Byte.MAX_VALUE) ? Byte.MAX_VALUE : (byte) url.getDepth());
          Util.putIntInByteArray(url.getDocid(), keyData, 2);
          return new DatabaseEntry(keyData);
      }