Comrade Trump made a pitch to sell gas to Germany in front of the UN back in 2018 and got laughed at. He then "forced" China to buy more American gas instead.
All crime/case details is for shanghai only, so not 1.4 billion, there should also be the basic ID info on all 1.4 Billion Chinese. There are also a lot of misc stuff from people all across China which I still haven't figured out in the sample.
So sounds like the leak is for Shanghai police case files, and there's a national ID registry in there as well, probably so the police can look up suspect information.