027b67be80
This implements the core of the rewrite described in: For the backend data model for UserPresence to one that supports much more efficient queries and is more correct around handling of multiple clients. The main loss of functionality is that we no longer track which Client sent presence data (so we will no longer be able to say using UserPresence "the user was last online on their desktop 15 minutes ago, but was online with their phone 3 minutes ago"). If we consider that information important for the occasional investigation query, we have can construct that answer data via UserActivity already. It's not worth making Presence much more expensive/complex to support it. For slim_presence clients, this sends the same data format we sent before, albeit with less complexity involved in constructing it. Note that we at present will always send both last_active_time and last_connected_time; we may revisit that in the future. This commit doesn't include the finalizing migration, which drops the UserPresenceOld table. The way to deploy is to start the backfill migration with the server down and then start the server *without* the user_presence queue worker, to let the migration finish without having new data interfering with it. Once the migration is done, the queue worker can be started, leading to the presence data catching up to the current state as the queue worker goes over the queued up events and updating the UserPresence table. Co-authored-by: Mateusz Mandera <mateusz.mandera@zulip.com> |
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README.md
Zulip overview
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Fortune 500 companies, leading open source projects, and thousands of other organizations use Zulip every day. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
Zulip is built by a distributed community of developers from all around the world, with 74+ people who have each contributed 100+ commits. With over 1000 contributors merging over 500 commits a month, Zulip is the largest and fastest growing open source team chat project.
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