It turns out that for some some deployments, there exists a second,
duplicate, foreign key constraint for user_profile_id. The logic below
would try to rename both to the same name, which would fail on the
second:
```
psycopg2.errors.DuplicateObject: constraint "zerver_userpresenceo_user_profile_id_d75366d6_fk_zerver_us" for relation "zerver_userpresence" already exists
```
Eliminate the duplicate constraint, rather than attempting to rename
it. Also add a block, in case of future reuse of this pattern, which
caveats that this approach will not work in the presence of
explicitly-named indexes. UserPresence happens to not have any, so
this technique is safe in this instance.
Co-authored-by: Alex Vandiver <alexmv@zulip.com>
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>
Anders Kaseorg
Mateusz Mandera
Tim Abbott