This adds experimental support in /register for sending key statistical data on the last 1000 private messages that the user is a participant in. Because it's experimental, we require developers to request it explicitly in production (we don't use these data yet in the webapp, and it likely carries some perf cost). We expect this to be extremely helpful in initializing the mobile app user experience for showing recent private message conversations. See the code comments, but this has been heavily optimized to be very efficient and do all the filtering work at the database layer so that we minimize network transit with the database. Fixes #11944.
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 300 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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