code: function mapXSetItems (items) {
    let results = [];
    for (let i = 0; i < items.length; i += 1) {
      results.push({
        timestamp: items[i][0],
        field: items[i][1][0],
        value: items[i][1][1]
      });
    }
    return results;
  }
docs: 1554806507854-0,ccm:group:join,{"groups":[groupX]} ....aaand:[["1554806507854-0",["ccm:group:join","{\"groups\":[groupX]}"]]]