https://blog.wongcw.com/2018/10/30/google-analytics-dataretention-%e8%b3%87%e6%96%99%e4%bf%9d%e7%95%99%e6%9c%9f%e9%99%90%e6%96%b0%e6%94%bf%e7%ad%96%ef%bc%8c%e5%9c%a85-25%e5%89%8d%e8%a8%ad%e5%ae%9a%e6%89%8d%e8%83%bd%e5%ae%8c%e6%95%b4/