This restyles and rewords some of the emoji style section to look
better and fit it more with the current style guide.
Tweaked by tabbott to modify the historical migration rather than
adding a new one. This is OK because the emojiset choices text change
doesn't touch the database; it's just a Django Python code thing.
Also removed translation tags, since we don't need them for a set of
brand names.
This adds the data model and bugdown support for the new UserGroup
mention feature.
Before it'll be fully operational, we'll still need:
* A backend API for making these.
* A UI for interacting with that API.
* Typeahead on the frontend.
* CSS to make them look pretty and see who's in them.
Tweaked by tabbott to have the field before the invitation is
completed be called invite_as_admins, not invited_as_admins, for
readability.
Fixes#6834.
Add this field to the Stream model will prevent us from having
to look at realm data for several types of stream operations, which
can be prone to either doing extra database lookups or making
our cached data bloated.
Going forward, we'll set stream.is_zephyr to True whenever the
realm's string id is "zephyr".
We need a migration to clear the tutorial_status for existing users,
so that we don't show hotspots to anyone who signed up for Zulip in
the month or so since we deleted the old tutorial.
We should have done this a long time ago, but better late than never.
Basically, this migration would crash in the event that there were any
attachments with particularly long names. The fix is the next
migration, 0042; we just inline it here to avoid that crash.
This commit completely switches us over to using a
dedicated model called MutedTopic to track which topics
a user has muted.
This includes the necessary migrations to create the
table and populate it from legacy data in UserProfile.
A subsequent commit will actually remove the old field
in UserProfile.
This is the first part of a larger migration to convert Zulip's
reactions storage to something based on the codepoint, not the emoji
name that the user typed in, so that we don't need to worry about
changes in the names we're using breaking the emoji storage.
This fixes a performance issue that caused this migration to run for a
really long time.
It still takes about 1 minute to run with the 75K Subscription objects
we have on chat.zulip.org, but that's within the realm of acceptable.
ScheduledJob was written for much more generality than it ended up being
used for. Currently it is used by send_future_email, and nothing
else. Tailoring the model to emails in particular will make it easier to do
things like selectively clear emails when people unsubscribe from particular
email types, or seamlessly handle using the same email on multiple realms.
This new setting controls whether or not users are allowed to see the
edit history in a Zulip organization. It controls access through 2
key mechanisms:
* For long-ago edited messages, get_messages removes the edit history
content from messages it sends to clients.
* For newly edited messages, clients are responsible for checking the
setting and not saving the edit history data. Since the webapp was
the only client displaying it before this change, this just required
some changes in message_events.js.
Significantly modified by tabbott to fix some logic bugs and add a
test.
In this commit we are adding two new fields to the UserProfile
table. These fields are the:
long_term_idle: For storing a bool value representing status of user
being online in long time where 'long' will have a specific
definition.
last_active_message_id: For storing the message id which was last
updated into the UserMessage table for a particular user.
This system hasn't been in active use for several years, and had some
problems with it's design. So it makes sense to just remove it to declutter
the codebase.
Fixes#5655.
This will allow for customized senders for emails, e.g. 'Zulip Digest' for
digest emails and 'Zulip Missed Messages' for missed message emails.
Also:
* Converts the sender name to always be "Zulip", if the from_email used to
be settings.NOREPLY_EMAIL_ADDRESS or settings.ZULIP_ADMINISTRATOR.
* Changes the default value of settings.NOREPLY_EMAIL_ADDRESS in the
prod_setting_template to no longer have a display name. The only use of
that display name was in the email pathway.
Once we implement org_type-specific features, it'll be easy to change a
corporate realm to a community realm, but hard to go the other way. The main
difference (the main thing that makes migrating from a community realm to a
corporate realm hard) is that you'd have to make everyone sign another terms
of service.
Instead of deleting the emojis we will just mark them as `deactivated`.
This will prevent their further use but at the same time they will be
displayed properly in the reactions and messages in which they are used.
This field will be used as a flag to indicate whether the realm emoji
has been deleted or not.
Includes a database migration.
This index is basically free, since it only consumes space for
messages that mention the user, but results in a massive performance
improvement when querying messages that mention a user.
This index is essentially free, since it only consumes resources for
starred messages, and massively improves the performance of the
"starred messages" narrow.
Since realm emoji are now required to be lowercase,
an appropriate migration was added to retroactively
fix any emoji that might have contained uppercase
letters.
Also, the validator on the model was changed to
reject uppercase letters.
- Add file_name field to `RealmEmoji` model and migration.
- Add emoji upload supporting to Upload backends.
- Add uploaded file processing to emoji views.
- Use emoji source url as based for display url.
- Change emoji form for image uploading.
- Fix back-end tests.
- Fix front-end tests.
- Add tests for emoji uploading.
Fixes#1134
Useful for the upcoming check_realmauditlog_by_user_query, if nothing else.
But I suspect it will indeed get use; looking for events around or within a
certain time is pretty natural for an audit log.
The main argument against I would say is that this should actually be a
joint index with something else. I'm not sure what that something else
should be, so just optimizing for what I think
check_realmauditlog_by_user_query will need for now.
This commit adds the backend support for a new style of tutorial which
allows for highlighting of multiple areas of the page with hotspots that
disappear when clicked by the user.
This adds an organization description field to the Realm model, as well as
an input field to the organization settings template. Added three tests.
Set the max length of the field to 100 characters.
Fixes#3962.
This makes the outcome if a user didn't have an avatar due to a past
email change reasonable; the user will just be bumped back to
gravatar, fixing their invalid state.
This commit introduces a migration for moving avatars from email based
to user id based storage.
This is in responce to change in behaviour of user_avatar_path to
return path comprising of realm id and a hash based on user id. Also
we fix test_helpers accordingly.
Fixes#3776.
This currently only supports this in emoji reactions, not in actual
emoji in message bodies, but it's a great start for people who want a
text-only view.
Tweaked to update the text by tabbott.
Fixes#3169.
This adds to Zulip support for a user changing their own email
address.
It's backed by a huge amount of work by Steve Howell on making email
changes actually work from a UI perspective.
Fixes#734.
This adds support for only allowing normal users with account age
equal or greater than a "waiting period" threshold to create streams;
this is useful for open organizations that want new members to
understand the community before creating streams.
If create_stream_by_admins_only setting is set to True, only admin users
were able to create streams. Now normal users with account age greater
or equal than waiting period threshold can also create streams.
Account age is defined as number of days passed since the user had
created his account.
Fixes: #2308.
Tweaked by tabbott to clean up the actual can_create_streams logic and
the tests.
This commit adds the following:
1. A reaction model that consists of a user, a message and an emoji that
are unique together (a user cannot react to a particular message more
than once with the same emoji)
2. A reaction event that looks like:
{
'type': 'reaction',
'op': 'add',
'message_id': 3,
'emoji_name': 'doge',
'user': {
'user_id': 1,
'email': 'hamlet@zulip.com',
'full_name': 'King Hamlet'
}
}
3. A new API endpoint, /reactions, that accepts POST requests to add a
reaction to a message
4. A migration to add the new model to the database
5. Tests that check that
(a) Invalid requests cannot be made
(b) The reaction event body contains all the info
(c) The reaction event is sent to the appropriate users
(d) Reacting more than once fails
It is still missing important features like removing emoji and
fetching them alongside messages.
This migration ensures that all historically uploaded files from
before we started tracking files in the Zulip database via the
Attachment model have Attachment objects.
This has been tested by tabbott against a production server to ensure
that it results in all old uploaded files having corresponding
attachment objects.
Merging this change is a key prerequisite for making our adding
attachment access controls in an enforcing fashion.
This makes it possible to configure only certain authentication
methods to be enabled on a per-realm basis.
Note that the authentication_methods_dict function (which checks what
backends are supported on the realm) requires an in function import
due to a circular dependency.
Removes the uniqueness constraint on RealmAlias.domain, and adds a function
can_add_alias that checks for uniqueness conditional on
settings.REALMS_HAVE_SUBDOMAINS.
Previously, we set restrict_to_domain and invite_required differently
depending on whether we were setting up a community or a corporate
realm. Setting restrict_to_domain requires validation on the domain of the
user's email, which is messy in the web realm creation flow, since we
validate the user's email before knowing whether the user intends to set up
a corporate or community realm. The simplest solution is to have the realm
creation flow impose as few restrictions as possible (community defaults),
and then worry about restrict_to_domain etc. after the user is already in.
We set the test suite to explictly use the old defaults, since several of
the tests depend on the old defaults.
This commit adds a database migration.
Adds a database migration, adds a new string_id argument to the management
realm creation command, and adds a short name field to the web realm
creation form when REALMS_HAVE_SUBDOMAINS is False.
Does a database migration to rename Realm.subdomain to
Realm.string_id, and makes Realm.subdomain a property. Eventually,
Realm.string_id will replace Realm.domain as the handle by which we
retrieve Realm objects.
This is a first step towards implementing a message retention policy
feature.
- Add Realm model message_retention_days field to setup
messages expired period for realm.
- Add migration.
- Add tool to get expired messages for each Realm.
- Add tests to cover tool for getting expired messages.
This is a preliminary step towards eliminating the realm.domain field
in favor of realm.subdomain. Includes a database migration to create
these for existing realms.
This adds a medium (500px) size avatar thumbnail, that can be
referenced as `{name}-medium.png`. It is intended to be used on the
user's own settings page, though we may come up with other use cases
for high-resolution avatars in the future.
This will automatically generate and upload the medium avatar images
when a new avatar original is uploaded, and contains a migration
(contributed by Kirill Kanakhin) to ensure all pre-existing avatar
images have a medium avatar.
Note that this implementation does not provide an endpoint for
fetching the medium-size avatar for another user.
[substantially modified by tabbott]
Adds a new field org_type to Realm. Defaults for restricted_to_domain
and invite_required are now controlled by org_type at time of realm
creation (see zerver.lib.actions.do_create_realm), rather than at the
database level. Note that the backend defaults are all
org_type=corporate, since that matches the current assumptions in the
codebase, whereas the frontend default is org_type=community, since if
a user isn't sure they probably want community.
Since we will likely in the future enable/disable various
administrative features based on whether an organization is corporate
or community, we discuss those issues in the realm creation form.
Before we actually implement any such features, we'll want to make
sure users understand what type of organization they are a member of.
Choice of org_type (via radio button) has been added to the realm
creation flow and the realm creation management command, and the
open-realm option removed.
The database defaults have not been changed, which allows our testing code
to work unchanged.
[includes some HTML/CSS work by Brock Whittaker to make it look nice]
This adds support for running a Zulip production server with each
realm on its own unique subdomain, e.g. https://realm_name.example.com.
This patch includes a ton of important features:
* Configuring the Zulip sesion middleware to issue cookier correctly
for the subdomains case.
* Throwing an error if the user tries to visit an invalid subdomain.
* Runs a portion of the Casper tests with REALMS_HAVE_SUBDOMAINS
enabled to test the subdomain signup process.
* Updating our integrations documentation to refer to the current subdomain.
* Enforces that users can only login to the subdomain of their realm
(but does not restrict the API; that will be tightened in a future commit).
Note that toggling settings.REALMS_HAVE_SUBDOMAINS on a live server is
not supported without manual intervention (the main problem will be
adding "subdomain" values for all the existing realms).
[substantially modified by tabbott as part of merging]
Most directly useful for the migration to zulipchat.com.
Creates a new field in UserProfile to store the tos_version, as well as two
new settings TOS_VERSION and FIRST_TIME_TOS_TEMPLATE. We check for a version
mismatch between what the user has signed and the current
settings.TOS_VERSION whenever the user hits the home page, and redirect them
if needed.
Note that accounts_accept_terms.html and
zerver.views.accounts_accept_terms were unused before this commit
(they date from c327446537)
Adds a new field default language in the zerver_realm model.
This realm level default language will be used as default language
for newly created users. Realm level default language can be
changed from the administration page.
Fixes#1372.
The MitUser model caused a constant series of little problems for
users with mit.edu email addresses trying to sign up for different
Zulip servers.
The new implementation just uses conditionals on the realm object when
selecting the confirmation template to use.
This is controlled through the admin tab and a new field in the Realms table.
Notes:
* The admin tab setting takes a value in minutes, whereas the backend stores it
in seconds.
* This setting is unused when allow_message_editing is false.
* There is some generosity in how the limit is enforced. For instance, if the
user sees the hovering edit button, we ensure they have at least 5 seconds to
click it, and if the user gets to the message edit form, we ensure they have
at least 10 seconds to make the edit, by relaxing the limit.
* This commit also includes a countdown timer in the message edit form.
Resolves#903.
This is controlled through the admin tab and a new field in the Realms
table. This mirrors the behavior of the old hardcoded setting
feature_flags.disable_message_editing. Partially resolves#903.
Squash the AlterField on UserProfile.groups in 0002 into the
AddField in 0001. This is done to avoid a probable bug in Django,
where running migrations in python 3 sometimes led to a KeyError.
This commit adds the capability to keep track and remove uploaded
files. Unclaimed attachments are files that have been uploaded to the
server but are not referred in any messages. A management command to
remove old unclaimed files after a week is also included.
Tests for getting the file referred in messages are also included.
As documented in https://github.com/zulip/zulip/issues/441, Guardian
has quite poor performance, and in fact almost 50% of the time spent
running the Zulip backend test suite on my laptop was inside Guardian.
As part of this migration, we also clean up the old API_SUPER_USERS
variable used to mark EMAIL_GATEWAY_BOT as an API super user; now that
permission is managed entirely via the database.
When rebasing past this commit, developers will need to do a
`manage.py migrate` in order to apply the migration changes before the
server will run again.
We can't yet remove Guardian from INSTALLED_APPS, requirements.txt,
etc. in this release, because otherwise the reverse migration won't
work.
Fixes#441.
89a2765553 didn't include the database
migration corresponding to the change, which means it didn't take full
effect when it was merged.
I noticed this because `manage.py makemigrations` would generate these
migrations; that suggests a good idea for a test to add.
This fixes a performance issue looking up UserProfile objects for
realms with a large number of users in the case that a UserProfile
object is not in the cache.
Thanks to @dbiollo for the suggestion!
These are the result of either the upgrade to Django 1.8 itself
(username max length increased to 254), or the changes needed for
Django 1.8 compatibility.
(imported from commit 6b1d7e73c85e9a2f7de9e5b91d851977eb4959e8)
This commit loses some indexes, unique constraints etc. that were
manually added by the old migrations. I plan to add them to a new
migration in a subsequent commit.
(imported from commit 4bcbf06080a7ad94788ac368385eac34b54623ce)
Include new field on Realm to control whether e-mail invitations are required
separately from whether the e-mail domain must match.
Allow control of these fields from admin panel.
Update logic in registration page to use these fields.
(imported from commit edc7f0a4c43b57361d9349e258ad4f217b426f88)
Apply this commit after hours!
To apply this commit, first run the migration and then run the following as the
zulip user on staging:
$ echo 'VACUUM zerver_message' | python manage.py dbshell
The above VACUUM is needed to clean out the existing fast update pending list.
It might take a long time and block new message inserts!
See discussion near Zulip message 18377486 for why we're turning off the fast
update mechanism for zephyr_message_search_tsvector.
The high level overview is:
As a consequence of the high work_mem setting on our postgres server, the
fastupdate pending list for zephyr_message_search_tsvector can grow very large.
This leads to the occasional INSERT or UPDATE taking inordinately long (many
minutes) as the pending list is flushed, blocking other inserts.
One other possible solution for preventing the list from growing too large is to
set the autovacuum storage parameters on the table such that the autovacuum
process will run after a reasonable number of INSERTs or UPDATEs. However, the
table is mostly INSERT-only. Therefore, only the autovacuum_analyze_*
parameters will actually do anything to affect when the autovacuumer will run,
but when it does, it will do a VACUUM ANALYZE instead of a plain VACUUM. We
don't particularly need the table to be re-analyzed that often.
Turning off fast update will eventually cause the index to become less
efficient, but we can always rebuild it later if we notice it starting to get
too slow.
(imported from commit f280c193c3bc0a3f312960510c5a7dcf97f30c3d)
Allow bot owners to set which streams their will receive events for
without needing to change a configuration file.
(imported from commit 2b69e519dbc12ffbdba072031a7f7196c9e50e33)
This allows bot owners to configure which streams messages are delivered
to without needing to change webhook URLs or configuration files.
(imported from commit 32a0c26657c145b001cd8cb3ce0a0364d48902ce)
This migration will do nothing on staging/prod since the indices already exist.
It is only for creating the indices in dev.
(imported from commit ac26a23641191ba73fbccc2eebc4a261ece6c624)
We will need to run these commands manually when deploying to staging:
CREATE INDEX CONCURRENTLY "zerver_message_has_attachment" ON "zerver_message" ("has_attachment");
CREATE INDEX CONCURRENTLY "zerver_message_has_image" ON "zerver_message" ("has_image");
CREATE INDEX CONCURRENTLY "zerver_message_has_link" ON "zerver_message" ("has_link");
(imported from commit 84808dc6b1af887ddf784cb8a875ae462f4df985)
From a user's perpsective, the stream has been deleted. From the
database's perspective, the stream has been deactivated -- the stream
messages still exist.
(imported from commit b08b30b2a822663e17d64182af1fb160c2193344)
A description was added to the streams and it is now displayed on the
subscriptions page. It can not be set in the UI yet.
(imported from commit 81d08b65eee42dba87cd99dd5bd30106c4eb6c6a)
Added a default_desktop_notifications boolean to userprofile with a UI
in Zulip Labs. This flag is used to default the notification flag on new
subscriptions.
(imported from commit a25223cc5ecf09980cf877991e25034bb3fd4046)
This is for the CUSTOMER28 folks, so that they can turn Zulip into a more "chat client" thing.
(imported from commit 373a8afae4998fce5560e7b2bd13804c8fbb39fc)
This replaces the AppleDeviceToken table with a generic
PushDeviceToken with a `kind` field to make it easier to add functionality
like per-device/per-stream settings that share code between Android and
iOS devices.
The schema must continue to work on prod with the old table name, so we
add the new table in parallel and can drop the old table once this code
hits prod and any necessary data is copied.
(imported from commit 0209a7013f2850ac6311f23c3d6f92c65ffd19e3)
ScheduledJobs with type Email displace the usual mandrill codepaths
in the Zulip Enterprise deploys
* Email-specific helper functions will appear in deliver_email.py
* 0058_auto__add_scheduledjob.py
(imported from commit 8db08d8a279600322acfdbed792dc1a676f7a0ab)
This was a precursor to UserMessage.flags.read that never got used
because we decided to use django-bitfield.
(imported from commit 868754723c07ee9b85ae951aee785e571ccfef97)
This commit must be simultaneously deployed on both staging and
prod0. It also requires completely taking down the app.
To deploy these changes, do:
* check out this commit at /root/zulip on postgres0, postgres1, staging, and prod0
* stop the process_fts_updates job on postgres0 and postgres1
* stop the app on staging and prod0
* do a puppet apply on postgres0, postgres1, staging, and prod0
* move the new client certificates into place on staging and app
* move the new server certificates into place on postgres0 and postgres1
* reload the database config on postgres0 and postgres1 (this might
actually require a restart)
* run tools/migrate-db on postgres0 as root
* do a deploy through this commit on staging and prod0
* start the process_fts_updates job on postgres0 and postgres1
* do a puppet apply on nagios
(imported from commit 819bdd14326c1425e2d3041a491a8ca3b9716506)
We need to run the schema migration manually using
"CREATE INDEX CONCURRENTLY upper_stream_name_idx ON zerver_stream ((upper(name)));"
since we need CONCURRENTLY and I seem to recall that doesn't work with South.
This significantly improves the uncached performance of get_stream()
(e.g. from 32ms to 9ms). At present, this codepath is not used
particularly heavily since we do cache the stream names and do most of
our filtering by recipient ID, but the index isn't expensive and does
provide a significant improvement in the uncached case.
(imported from commit 4d28dc2e9a02d0602861b165393d90ed18f5f4c8)
We need to run the schema migration manually using
"CREATE INDEX CONCURRENTLY upper_subject_idx ON zerver_message ((upper(subject)));"
since we need CONCURRENTLY and I seem to recall that doesn't work with South.
Apparently our existing indexes on subject/topic weren't being used in
our narrowing queries, because we do case-insensitive search.
This substantially improves our database performance around
stream+topic narrows. See before and after query plans below from my
test instance.
humbug=# explain analyze SELECT "zerver_message"."id" FROM "zerver_message" WHERE ("zerver_message"."recipient_id" = 38 AND UPPER(zerver_message.subject) = 'TEST' AND "zerver_message"."id" <= 348495 ) ORDER BY "zerver_message"."id" DESC LIMIT 50;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------
Limit (cost=13510.61..13510.71 rows=41 width=4) (actual time=32.952..32.958 rows=2 loops=1)
-> Sort (cost=13510.61..13510.71 rows=41 width=4) (actual time=32.946..32.947 rows=2 loops=1)
Sort Key: id
Sort Method: quicksort Memory: 25kB
-> Bitmap Heap Scan on zerver_message (cost=237.99..13509.51 rows=41 width=4) (actual time=2.357..32.912 rows=2 loops=1)
Recheck Cond: (recipient_id = 38)
Filter: ((id <= 348495) AND (upper((subject)::text) = 'TEST'::text))
-> Bitmap Index Scan on zephyr_message_recipient_id (cost=0.00..237.98 rows=8221 width=0) (actual time=1.178..1.178 rows=10354 loops=1)
Index Cond: (recipient_id = 38)
Total runtime: 33.049 ms
(10 rows)
humbug=# explain analyze SELECT "zerver_message"."id" FROM "zerver_message" WHERE ("zerver_message"."recipient_id" = 38 AND UPPER(zerver_message.subject) = 'TEST' AND "zerver_message"."id" <= 348495 ) ORDER BY "zerver_message"."id" DESC LIMIT 50;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Limit (cost=435.11..435.22 rows=41 width=4) (actual time=4.998..4.999 rows=2 loops=1)
-> Sort (cost=435.11..435.22 rows=41 width=4) (actual time=4.997..4.997 rows=2 loops=1)
Sort Key: id
Sort Method: quicksort Memory: 25kB
-> Bitmap Heap Scan on zerver_message (cost=275.63..434.02 rows=41 width=4) (actual time=4.981..4.984 rows=2 loops=1)
Recheck Cond: ((upper((subject)::text) = 'TEST'::text) AND (recipient_id = 38))
Filter: (id <= 348495)
-> BitmapAnd (cost=275.63..275.63 rows=41 width=0) (actual time=4.954..4.954 rows=0 loops=1)
-> Bitmap Index Scan on upper_subject_idx (cost=0.00..37.38 rows=1744 width=0) (actual time=2.972..2.972 rows=27457 loops=1)
Index Cond: (upper((subject)::text) = 'TEST'::text)
-> Bitmap Index Scan on zephyr_message_recipient_id (cost=0.00..237.98 rows=8221 width=0) (actual time=0.855..0.855 rows=10354 loops=1)
Index Cond: (recipient_id = 38)
Total runtime: 5.049 ms
(13 rows)
(imported from commit 1f4815ccb0691053ff8d505149482dbc74153fb3)
In order to support iOS Push Notifications, we need to keep track
of a device's unique APNS Token. These are delivered to our iOS
code after registering for remote notifications
(imported from commit bbe34483e1380dc20a1c93e3ffa1fcfdb9087e67)
These engagement data will be useful both for making pretty graphs of
how addicted our users are as well as for allowing us to check whether
a new deployment is actually using the product or not.
This measures "number of minutes during which each user had checked
the app within the previous 15 minutes". It should correctly not
count server-initiated reloads.
It's possible that we should use something less aggressive than
mousemove; I'm a little torn on that because you really can check the
app for new messages without doing anything active.
This is somewhat tested but there are a few outstanding issues:
* Mobile apps don't report these data. It should be as easy as having
them send in update_active_status queries with new_user_input=true.
* The semantics of this should be better documented (e.g. the
management script should print out the spec above)x.
(imported from commit ec8b2dc96b180e1951df00490707ae916887178e)
This commit CANNOT be deployed until the previous schema change
([schema] models: add an email_token field to Streams) is on prod.
Before applying this schema change, run the populate-stream-tokens
management command to generate tokens for streams that need them.
(imported from commit 7adc81c8c317ec5d59dd59ba42a4dc1a46174007)
The e-mail forwarder will use this. Set it to nullable temporarily to
accomodate existing streams; later commits will a) provide a script to
give all streams a token, and b) make the field non-null.
Realm administrators will eventually have a UI to regenerate stream
tokens.
(imported from commit a084d0a7012eb9665e4da095cbc46aa9ef354eaa)
This needs to be deployed to both staging and prod at the same
off-peak time (and the schema migration run).
At the time it is deployed, we need to make a few changes directly in
the database:
(1) UPDATE django_content_type set app_label='zerver' where app_label='zephyr';
(2) UPDATE south_migrationhistory set app_name='zerver' where app_name='zephyr';
(imported from commit eb3fd719571740189514ef0b884738cb30df1320)