737e02a2e6
Before this fix, we were creating two copies of every PM Message in zerver_message with only corresponding UserMessage row. Now we only create one PM Message per message, which we accomplish by making sure we only use imported messages from the sender's history.json file. And then we write UserMessage rows for both participants by making sure to include sender_id in the set of user_ids that feeds into making UserMessage. For the case where you PM yourself, there's just one UserMessage row. It does not appear that we need to support huddles yet.
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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