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Make sqlite database migrations transactional again #14910

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Jan 25, 2023
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Make sqlite database migrations transactional again #14910

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squahtx
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@squahtx squahtx commented Jan 24, 2023

#13873 introduced a regression which causes sqlite database migrations
to no longer run inside a transaction. Wrap them in a transaction again,
to avoid database corruption when migrations are interrupted.

Fixes #14909.

Signed-off-by: Sean Quah seanq@matrix.org

Make sqlite database migrations transactional again
0cf41ba 
#13873 introduced a regression which causes sqlite database migrations
to no longer run inside a transaction. Wrap them in a transaction again,
to avoid database corruption when migrations are interrupted.

Fixes #14909.

Signed-off-by: Sean Quah <seanq@matrix.org>
@squahtx squahtx requested a review from a team as a code owner January 24, 2023 22:12
clokep
clokep approved these changes Jan 24, 2023
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Seems to do what it says.

Do we still need to hand rolled parsing or no?

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squahtx commented Jan 25, 2023

Thanks. The hand rolled parsing is still used in a bunch of old database migrations, which I want to leave alone right now.

https://github.com/matrix-org/synapse/search?q=get_statements&type=code

@squahtx squahtx merged commit a63d4cc into develop Jan 25, 2023
@squahtx squahtx deleted the squah/sqlite_schema_delta_transactions branch January 25, 2023 13:38
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clokep commented Jan 25, 2023

Thanks. The hand rolled parsing is still used in a bunch of old database migrations, which I want to leave alone right now.

matrix-org/synapse/search?type=code (get_statements)

Thanks! I would like to reach a point we can remove very old deltas, but I'm unsure the work required to do so. Anyway seems reasonable for now.

DMRobertson
DMRobertson reviewed Jan 25, 2023
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synapse/storage/engines/sqlite.py

> If there is a pending transaction, an implicit COMMIT statement is executed
> first. No other implicit transaction control is performed; any transaction
> control must be added to sql_script.
"""
cursor.executescript(script)
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Unfortunately, script will not contain the statement

synapse/synapse/storage/prepare_database.py

Lines 540 to 544 in 0a38c7e

# Mark as done.
cur.execute(
"INSERT INTO applied_schema_deltas (version, file) VALUES (?,?)",
(v, relative_path),
)

which adds a row to applied_schema_deltas.

It's possible that we are interrupted after running the migration and the COMMIT added here, but before we mark the transaction as done. Then on the next restart, we'll try to reapply an applied migration, which I expect will fail. It's a small window, and having the COMMIT here is a vast improvement... so I think we should probably leave it as-is?

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That's a good point.

I wasn't sure how a BEGIN without a corresponding COMMIT would behave in executescript. The implicit commit at the start implies that some level of magic is going on.

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Could we insert that as the last line of the script?

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We could, it'll just take a bunch of refactoring. I'm tempted to omit the final COMMIT and add some unit tests instead.

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@squahtx squahtx Jan 25, 2023 •
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executescript is defined here:
https://github.com/python/cpython/blob/7e3f09cad9b783d8968aa79ff6a8ee57beb8b83e/Modules/_sqlite/cursor.c#L1017

and it looks like there's no reason leaving the transaction open shouldn't work.

@squahtx squahtx mentioned this pull request Jan 25, 2023
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squahtx pushed a commit that referenced this pull request Jan 26, 2023
Make sqlite database migrations transactional again, part two (#14910)
22852f4 
#14910 fixed the regression introduced by #13873 where sqlite database
migrataions would no longer run inside a transaction. However, it
committed the transaction before Synapse updated its bookkeeping of
which migrations have been run, which means that migrations may be run
again after they have completed successfully.

Leave the transaction open at the end of `executescript`, to restore the
old, correct behaviour.

Fixes #14909.

Signed-off-by: Sean Quah <seanq@matrix.org>
@squahtx squahtx mentioned this pull request Jan 26, 2023
Merged
squahtx pushed a commit that referenced this pull request Jan 26, 2023
Make sqlite database migrations transactional again, part two
6716f8c 
#14910 fixed the regression introduced by #13873 where sqlite database
migrataions would no longer run inside a transaction. However, it
committed the transaction before Synapse updated its bookkeeping of
which migrations have been run, which means that migrations may be run
again after they have completed successfully.

Leave the transaction open at the end of `executescript`, to restore the
old, correct behaviour.

Fixes #14909.

Signed-off-by: Sean Quah <seanq@matrix.org>
squahtx added a commit that referenced this pull request Jan 31, 2023
@squahtx
Make sqlite database migrations transactional again, part two (#14926)
6d14fdc 
#14910 fixed the regression introduced by #13873 where sqlite database
migrations would no longer run inside a transaction. However, it
committed the transaction before Synapse updated its bookkeeping of
which migrations have been run, which means that migrations may be run
again after they have completed successfully.

Leave the transaction open at the end of `executescript`, to restore the
old, correct behaviour. Also make the PostgreSQL behaviour consistent
with SQLite.

Fixes #14909.

Signed-off-by: Sean Quah <seanq@matrix.org>
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Feb 6, 2023
@Midar
Update chat/matrix-synapse to 1.76.0
75d0625 
Synapse 1.76.0 (2023-01-31)
===========================

The 1.76 release is the first to enable faster joins ([MSC3706](matrix-org/matrix-spec-proposals#3706) and [MSC3902](matrix-org/matrix-spec-proposals#3902)) by default. Admins can opt-out: see [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.76/docs/upgrade.md#faster-joins-are-enabled-by-default) for more details.

The upgrade from 1.75 to 1.76 changes the account data replication streams in a backwards-incompatible manner. Server operators running a multi-worker deployment should consult [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.76/docs/upgrade.md#changes-to-the-account-data-replication-streams).

Those who are `poetry install`ing from source using our lockfile should ensure their poetry version is 1.3.2 or higher; [see upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.76/docs/upgrade.md#minimum-version-of-poetry-is-now-132).


Notes on faster joins
---------------------

The faster joins project sees the most benefit when joining a room with a large number of members (joined or historical). We expect it to be particularly useful for joining large public rooms like the [Matrix HQ](https://matrix.to/#/#matrix:matrix.org) or [Synapse Admins](https://matrix.to/#/#synapse:matrix.org) rooms.

After a faster join, Synapse considers that room "partially joined". In this state, you should be able to

- read incoming messages;
- see incoming state changes, e.g. room topic changes; and
- send messages, if the room is unencrypted.

Synapse has to spend more effort to complete the join in the background. Once this finishes, you will be able to

- send messages, if the room is in encrypted;
- retrieve room history from before your join, if permitted by the room settings; and
- access the full list of room members.


Improved Documentation
----------------------

- Describe the ideas and the internal machinery behind faster joins. ([\#14677](matrix-org/synapse#14677))


Synapse 1.76.0rc2 (2023-01-27)
==============================

Bugfixes
--------

- Faster joins: Fix a bug introduced in Synapse 1.69 where device list EDUs could fail to be handled after a restart when a faster join sync is in progress. ([\#14914](matrix-org/synapse#14914))


Internal Changes
----------------

- Faster joins: Improve performance of looking up partial-state status of rooms. ([\#14917](matrix-org/synapse#14917))


Synapse 1.76.0rc1 (2023-01-25)
==============================

Features
--------

- Update the default room version to [v10](https://spec.matrix.org/v1.5/rooms/v10/) ([MSC 3904](matrix-org/matrix-spec-proposals#3904)). Contributed by @FSG-Cat. ([\#14111](matrix-org/synapse#14111))
- Add a `set_displayname()` method to the module API for setting a user's display name. ([\#14629](matrix-org/synapse#14629))
- Add a dedicated listener configuration for `health` endpoint. ([\#14747](matrix-org/synapse#14747))
- Implement support for [MSC3890](matrix-org/matrix-spec-proposals#3890): Remotely silence local notifications. ([\#14775](matrix-org/synapse#14775))
- Implement experimental support for [MSC3930](matrix-org/matrix-spec-proposals#3930): Push rules for ([MSC3381](matrix-org/matrix-spec-proposals#3381)) Polls. ([\#14787](matrix-org/synapse#14787))
- Per [MSC3925](matrix-org/matrix-spec-proposals#3925), bundle the whole of the replacement with any edited events, and optionally inhibit server-side replacement. ([\#14811](matrix-org/synapse#14811))
- Faster joins: always serve a partial join response to servers that request it with the stable query param. ([\#14839](matrix-org/synapse#14839))
- Faster joins: allow non-lazy-loading ("eager") syncs to complete after a partial join by omitting partial state rooms until they become fully stated. ([\#14870](matrix-org/synapse#14870))
- Faster joins: request partial joins by default. Admins can opt-out of this for the time being---see the upgrade notes. ([\#14905](matrix-org/synapse#14905))


Bugfixes
--------

- Add index to improve performance of the `/timestamp_to_event` endpoint used for jumping to a specific date in the timeline of a room. ([\#14799](matrix-org/synapse#14799))
- Fix a long-standing bug where Synapse would exhaust the stack when processing many federation requests where the remote homeserver has disconencted early. ([\#14812](matrix-org/synapse#14812), [\#14842](matrix-org/synapse#14842))
- Fix rare races when using workers. ([\#14820](matrix-org/synapse#14820))
- Fix a bug introduced in Synapse 1.64.0 when using room version 10 with frozen events enabled. ([\#14864](matrix-org/synapse#14864))
- Fix a long-standing bug where the `populate_room_stats` background job could fail on broken rooms. ([\#14873](matrix-org/synapse#14873))
- Faster joins: Fix a bug in worker deployments where the room stats and user directory would not get updated when finishing a fast join until another event is sent or received. ([\#14874](matrix-org/synapse#14874))
- Faster joins: Fix incompatibility with joins into restricted rooms where no local users have the ability to invite. ([\#14882](matrix-org/synapse#14882))
- Fix a regression introduced in Synapse 1.69.0 which can result in database corruption when database migrations are interrupted on sqlite. ([\#14910](matrix-org/synapse#14910))


Updates to the Docker image
---------------------------

- Bump default Python version in the Dockerfile from 3.9 to 3.11. ([\#14875](matrix-org/synapse#14875))


Improved Documentation
----------------------

- Include `x_forwarded` entry in the HTTP listener example configs and remove the remaining `worker_main_http_uri` entries. ([\#14667](matrix-org/synapse#14667))
- Remove duplicate commands from the Code Style documentation page; point to the Contributing Guide instead. ([\#14773](matrix-org/synapse#14773))
- Add missing documentation for `tag` to `listeners` section. ([\#14803](matrix-org/synapse#14803))
- Updated documentation in configuration manual for `user_directory.search_all_users`. ([\#14818](matrix-org/synapse#14818))
- Add `worker_manhole` to configuration manual. ([\#14824](matrix-org/synapse#14824))
- Fix the example config missing the `id` field in [application service documentation](https://matrix-org.github.io/synapse/latest/application_services.html). ([\#14845](matrix-org/synapse#14845))
- Minor corrections to the logging configuration documentation. ([\#14868](matrix-org/synapse#14868))
- Document the export user data command. Contributed by @thezaidbintariq. ([\#14883](matrix-org/synapse#14883))


Deprecations and Removals
-------------------------

- Poetry 1.3.2 or higher is now required when `poetry install`ing from source. ([\#14860](matrix-org/synapse#14860))


Internal Changes
----------------

- Faster remote room joins (worker mode): do not populate external hosts-in-room cache when sending events as this requires blocking for full state. ([\#14749](matrix-org/synapse#14749))
- Enable Complement tests for Faster Remote Room Joins against worker-mode Synapse. ([\#14752](matrix-org/synapse#14752))
- Add some clarifying comments and refactor a portion of the `Keyring` class for readability. ([\#14804](matrix-org/synapse#14804))
- Add local poetry config files (`poetry.toml`) to `.gitignore`. ([\#14807](matrix-org/synapse#14807))
- Add missing type hints. ([\#14816](matrix-org/synapse#14816), [\#14885](matrix-org/synapse#14885), [\#14889](matrix-org/synapse#14889))
- Refactor push tests. ([\#14819](matrix-org/synapse#14819))
- Re-enable some linting that was disabled when we switched to ruff. ([\#14821](matrix-org/synapse#14821))
- Add `cargo fmt` and `cargo clippy` to the lint script. ([\#14822](matrix-org/synapse#14822))
- Drop unused table `presence`. ([\#14825](matrix-org/synapse#14825))
- Merge the two account data and the two device list replication streams. ([\#14826](matrix-org/synapse#14826), [\#14833](matrix-org/synapse#14833))
- Faster joins: use stable identifiers from [MSC3706](matrix-org/matrix-spec-proposals#3706). ([\#14832](matrix-org/synapse#14832), [\#14841](matrix-org/synapse#14841))
- Add a parameter to control whether the federation client performs a partial state join. ([\#14843](matrix-org/synapse#14843))
- Add check to avoid starting duplicate partial state syncs. ([\#14844](matrix-org/synapse#14844))
- Add an early return when handling no-op presence updates. ([\#14855](matrix-org/synapse#14855))
- Fix `wait_for_stream_position` to correctly wait for the right instance to advance its token. ([\#14856](matrix-org/synapse#14856), [\#14872](matrix-org/synapse#14872))
- Always notify replication when a stream advances automatically. ([\#14877](matrix-org/synapse#14877))
- Reduce max time we wait for stream positions. ([\#14881](matrix-org/synapse#14881))
- Faster joins: allow the resync process more time to fetch `/state` ids. ([\#14912](matrix-org/synapse#14912))
- Bump regex from 1.7.0 to 1.7.1. ([\#14848](matrix-org/synapse#14848))
- Bump peaceiris/actions-gh-pages from 3.9.1 to 3.9.2. ([\#14861](matrix-org/synapse#14861))
- Bump ruff from 0.0.215 to 0.0.224. ([\#14862](matrix-org/synapse#14862))
- Bump types-pillow from 9.4.0.0 to 9.4.0.3. ([\#14863](matrix-org/synapse#14863))
- Bump types-opentracing from 2.4.10 to 2.4.10.1. ([\#14896](matrix-org/synapse#14896))
- Bump ruff from 0.0.224 to 0.0.230. ([\#14897](matrix-org/synapse#14897))
- Bump types-requests from 2.28.11.7 to 2.28.11.8. ([\#14899](matrix-org/synapse#14899))
- Bump types-psycopg2 from 2.9.21.2 to 2.9.21.4. ([\#14900](matrix-org/synapse#14900))
- Bump types-commonmark from 0.9.2 to 0.9.2.1. ([\#14901](matrix-org/synapse#14901))


Synapse 1.75.0 (2023-01-17)
===========================

No significant changes since 1.75.0rc2.


Synapse 1.75.0rc2 (2023-01-12)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.75.0rc1 where device lists could be miscalculated with some sync filters. ([\#14810](matrix-org/synapse#14810))
- Fix race where calling `/members` or `/state` with an `at` parameter could fail for newly created rooms, when using multiple workers. ([\#14817](matrix-org/synapse#14817))


Synapse 1.75.0rc1 (2023-01-10)
==============================

Features
--------

- Add a `cached` function to `synapse.module_api` that returns a decorator to cache return values of functions. ([\#14663](matrix-org/synapse#14663))
- Add experimental support for [MSC3391](matrix-org/matrix-spec-proposals#3391) (removing account data). ([\#14714](matrix-org/synapse#14714))
- Support [RFC7636](https://datatracker.ietf.org/doc/html/rfc7636) Proof Key for Code Exchange for OAuth single sign-on. ([\#14750](matrix-org/synapse#14750))
- Support non-OpenID compliant userinfo claims for subject and picture. ([\#14753](matrix-org/synapse#14753))
- Improve performance of `/sync` when filtering all rooms, message types, or senders. ([\#14786](matrix-org/synapse#14786))
- Improve performance of the `/hierarchy` endpoint. ([\#14263](matrix-org/synapse#14263))


Bugfixes
--------

- Fix the *MAU Limits* section of the Grafana dashboard relying on a specific `job` name for the workers of a Synapse deployment. ([\#14644](matrix-org/synapse#14644))
- Fix a bug introduced in Synapse 1.70.0 which could cause spurious `UNIQUE constraint failed` errors in the `rotate_notifs` background job. ([\#14669](matrix-org/synapse#14669))
- Ensure stream IDs are always updated after caches get invalidated with workers. Contributed by Nick @ Beeper (@Fizzadar). ([\#14723](matrix-org/synapse#14723))
- Remove the unspecced `device` field from `/pushrules` responses. ([\#14727](matrix-org/synapse#14727))
- Fix a bug introduced in Synapse 1.73.0 where the `picture_claim` configured under `oidc_providers` was unused (the default value of `"picture"` was used instead). ([\#14751](matrix-org/synapse#14751))
- Unescape HTML entities in URL preview titles making use of oEmbed responses. ([\#14781](matrix-org/synapse#14781))
- Disable sending confirmation email when 3pid is disabled. ([\#14725](matrix-org/synapse#14725))


Improved Documentation
----------------------

- Declare support for Python 3.11. ([\#14673](matrix-org/synapse#14673))
- Fix `target_memory_usage` being used in the description for the actual `cache_autotune` sub-option `target_cache_memory_usage`. ([\#14674](matrix-org/synapse#14674))
- Move `email` to Server section in config file documentation. ([\#14730](matrix-org/synapse#14730))
- Fix broken links in the Synapse documentation. ([\#14744](matrix-org/synapse#14744))
- Add missing worker settings to shared configuration documentation. ([\#14748](matrix-org/synapse#14748))
- Document using Twitter as a OAuth 2.0 authentication provider. ([\#14778](matrix-org/synapse#14778))
- Fix Synapse 1.74 upgrade notes to correctly explain how to install pyICU when installing Synapse from PyPI. ([\#14797](matrix-org/synapse#14797))
- Update link to towncrier in contribution guide. ([\#14801](matrix-org/synapse#14801))
- Use `htmltest` to check links in the Synapse documentation. ([\#14743](matrix-org/synapse#14743))


Internal Changes
----------------

- Faster remote room joins: stream the un-partial-stating of events over replication. ([\#14545](matrix-org/synapse#14545), [\#14546](matrix-org/synapse#14546))
- Use [ruff](https://github.com/charliermarsh/ruff/) instead of flake8. ([\#14633](matrix-org/synapse#14633), [\#14741](matrix-org/synapse#14741))
- Change `handle_new_client_event` signature so that a 429 does not reach clients on `PartialStateConflictError`, and internally retry when needed instead. ([\#14665](matrix-org/synapse#14665))
- Remove dependency on jQuery on reCAPTCHA page. ([\#14672](matrix-org/synapse#14672))
- Faster joins: make `compute_state_after_events` consistent with other state-fetching functions that take a `StateFilter`. ([\#14676](matrix-org/synapse#14676))
- Add missing type hints. ([\#14680](matrix-org/synapse#14680), [\#14681](matrix-org/synapse#14681), [\#14687](matrix-org/synapse#14687))
- Improve type annotations for the helper methods on a `CachedFunction`. ([\#14685](matrix-org/synapse#14685))
- Check that the SQLite database file exists before porting to PostgreSQL. ([\#14692](matrix-org/synapse#14692))
- Add `.direnv/` directory to .gitignore to prevent local state generated by the [direnv](https://direnv.net/) development tool from being committed. ([\#14707](matrix-org/synapse#14707))
- Batch up replication requests to request the resyncing of remote users's devices. ([\#14716](matrix-org/synapse#14716))
- If debug logging is enabled, log the `msgid`s of any to-device messages that are returned over `/sync`. ([\#14724](matrix-org/synapse#14724))
- Change GHA CI job to follow best practices. ([\#14772](matrix-org/synapse#14772))
- Switch to our fork of `dh-virtualenv` to work around an upstream Python 3.11 incompatibility. ([\#14774](matrix-org/synapse#14774))
- Skip testing built wheels for PyPy 3.7 on Linux x86_64 as we lack new required dependencies in the build environment. ([\#14802](matrix-org/synapse#14802))

### Dependabot updates

<details>

- Bump JasonEtco/create-an-issue from 2.8.1 to 2.8.2. ([\#14693](matrix-org/synapse#14693))
- Bump anyhow from 1.0.66 to 1.0.68. ([\#14694](matrix-org/synapse#14694))
- Bump blake2 from 0.10.5 to 0.10.6. ([\#14695](matrix-org/synapse#14695))
- Bump serde_json from 1.0.89 to 1.0.91. ([\#14696](matrix-org/synapse#14696))
- Bump serde from 1.0.150 to 1.0.151. ([\#14697](matrix-org/synapse#14697))
- Bump lxml from 4.9.1 to 4.9.2. ([\#14698](matrix-org/synapse#14698))
- Bump types-jsonschema from 4.17.0.1 to 4.17.0.2. ([\#14700](matrix-org/synapse#14700))
- Bump sentry-sdk from 1.11.1 to 1.12.0. ([\#14701](matrix-org/synapse#14701))
- Bump types-setuptools from 65.6.0.1 to 65.6.0.2. ([\#14702](matrix-org/synapse#14702))
- Bump minimum PyYAML to 3.13. ([\#14720](matrix-org/synapse#14720))
- Bump JasonEtco/create-an-issue from 2.8.2 to 2.9.1. ([\#14731](matrix-org/synapse#14731))
- Bump towncrier from 22.8.0 to 22.12.0. ([\#14732](matrix-org/synapse#14732))
- Bump isort from 5.10.1 to 5.11.4. ([\#14733](matrix-org/synapse#14733))
- Bump attrs from 22.1.0 to 22.2.0. ([\#14734](matrix-org/synapse#14734))
- Bump black from 22.10.0 to 22.12.0. ([\#14735](matrix-org/synapse#14735))
- Bump sentry-sdk from 1.12.0 to 1.12.1. ([\#14736](matrix-org/synapse#14736))
- Bump setuptools from 65.3.0 to 65.5.1. ([\#14738](matrix-org/synapse#14738))
- Bump serde from 1.0.151 to 1.0.152. ([\#14758](matrix-org/synapse#14758))
- Bump ruff from 0.0.189 to 0.0.206. ([\#14759](matrix-org/synapse#14759))
- Bump pydantic from 1.10.2 to 1.10.4. ([\#14760](matrix-org/synapse#14760))
- Bump gitpython from 3.1.29 to 3.1.30. ([\#14761](matrix-org/synapse#14761))
- Bump pillow from 9.3.0 to 9.4.0. ([\#14762](matrix-org/synapse#14762))
- Bump types-requests from 2.28.11.5 to 2.28.11.7. ([\#14763](matrix-org/synapse#14763))
- Bump dawidd6/action-download-artifact from 2.24.2 to 2.24.3. ([\#14779](matrix-org/synapse#14779))
- Bump peaceiris/actions-gh-pages from 3.9.0 to 3.9.1. ([\#14791](matrix-org/synapse#14791))
- Bump types-pillow from 9.3.0.4 to 9.4.0.0. ([\#14792](matrix-org/synapse#14792))
- Bump pyopenssl from 22.1.0 to 23.0.0. ([\#14793](matrix-org/synapse#14793))
- Bump types-setuptools from 65.6.0.2 to 65.6.0.3. ([\#14794](matrix-org/synapse#14794))
- Bump importlib-metadata from 4.2.0 to 6.0.0. ([\#14795](matrix-org/synapse#14795))
- Bump ruff from 0.0.206 to 0.0.215. ([\#14796](matrix-org/synapse#14796))
</details>

Synapse 1.74.0 (2022-12-20)
===========================

Improved Documentation
----------------------

- Add release note and update documentation regarding optional ICU support in user search. ([\#14712](matrix-org/synapse#14712))


Synapse 1.74.0rc1 (2022-12-13)
==============================

Features
--------

- Improve user search for international display names. ([\#14464](matrix-org/synapse#14464))
- Stop using deprecated `keyIds` parameter when calling `/_matrix/key/v2/server`. ([\#14490](matrix-org/synapse#14490), [\#14525](matrix-org/synapse#14525))
- Add new `push.enabled` config option to allow opting out of push notification calculation. ([\#14551](matrix-org/synapse#14551), [\#14619](matrix-org/synapse#14619))
- Advertise support for Matrix 1.5 on `/_matrix/client/versions`. ([\#14576](matrix-org/synapse#14576))
- Improve opentracing and logging for to-device message handling. ([\#14598](matrix-org/synapse#14598))
- Allow selecting "prejoin" events by state keys in addition to event types. ([\#14642](matrix-org/synapse#14642))


Bugfixes
--------

- Fix a long-standing bug where a device list update might not be sent to clients in certain circumstances. ([\#14435](matrix-org/synapse#14435), [\#14592](matrix-org/synapse#14592), [\#14604](matrix-org/synapse#14604))
- Suppress a spurious warning when `POST /rooms/<room_id>/<membership>/`, `POST /join/<room_id_or_alias`, or the unspecced `PUT /join/<room_id_or_alias>/<txn_id>` receive an empty HTTP request body. ([\#14600](matrix-org/synapse#14600))
- Return spec-compliant JSON errors when unknown endpoints are requested. ([\#14620](matrix-org/synapse#14620), [\#14621](matrix-org/synapse#14621))
- Update html templates to load images over HTTPS. Contributed by @ashfame. ([\#14625](matrix-org/synapse#14625))
- Fix a long-standing bug where the user directory would return 1 more row than requested. ([\#14631](matrix-org/synapse#14631))
- Reject invalid read receipt requests with empty room or event IDs. Contributed by Nick @ Beeper (@Fizzadar). ([\#14632](matrix-org/synapse#14632))
- Fix a bug introduced in Synapse 1.67.0 where not specifying a config file or a server URL would lead to the `register_new_matrix_user` script failing. ([\#14637](matrix-org/synapse#14637))
- Fix a long-standing bug where the user directory and room/user stats might be out of sync. ([\#14639](matrix-org/synapse#14639), [\#14643](matrix-org/synapse#14643))
- Fix a bug introduced in Synapse 1.72.0 where the background updates to add non-thread unique indexes on receipts would fail if they were previously interrupted. ([\#14650](matrix-org/synapse#14650))
- Improve validation of field size limits in events. ([\#14664](matrix-org/synapse#14664))
- Fix bugs introduced in Synapse 1.55.0 and 1.69.0 where application services would not be notified of events in the correct rooms, due to stale caches. ([\#14670](matrix-org/synapse#14670))


Improved Documentation
----------------------

- Update worker settings for `pusher` and `federation_sender` functionality. ([\#14493](matrix-org/synapse#14493))
- Add links to third party package repositories, and point to the bug which highlights Ubuntu's out-of-date packages. ([\#14517](matrix-org/synapse#14517))
- Remove old, incorrect minimum postgres version note and replace with a link to the [Dependency Deprecation Policy](https://matrix-org.github.io/synapse/v1.73/deprecation_policy.html). ([\#14590](matrix-org/synapse#14590))
- Add Single-Sign On setup instructions for Mastodon-based instances. ([\#14594](matrix-org/synapse#14594))
- Change `turn_allow_guests` example value to lowercase `true`. ([\#14634](matrix-org/synapse#14634))


Internal Changes
----------------

- Optimise push badge count calculations. Contributed by Nick @ Beeper (@Fizzadar). ([\#14255](matrix-org/synapse#14255))
- Faster remote room joins: stream the un-partial-stating of rooms over replication. ([\#14473](matrix-org/synapse#14473), [\#14474](matrix-org/synapse#14474))
- Share the `ClientRestResource` for both workers and the main process. ([\#14528](matrix-org/synapse#14528))
- Add `--editable` flag to `complement.sh` which uses an editable install of Synapse for faster turn-around times whilst developing iteratively. ([\#14548](matrix-org/synapse#14548))
- Faster joins: use servers list approximation to send read receipts when in partial state instead of waiting for the full state of the room. ([\#14549](matrix-org/synapse#14549))
- Modernize unit tests configuration related to workers. ([\#14568](matrix-org/synapse#14568))
- Bump jsonschema from 4.17.0 to 4.17.3. ([\#14591](matrix-org/synapse#14591))
- Fix Rust lint CI. ([\#14602](matrix-org/synapse#14602))
- Bump JasonEtco/create-an-issue from 2.5.0 to 2.8.1. ([\#14607](matrix-org/synapse#14607))
- Alter some unit test environment parameters to decrease time spent running tests. ([\#14610](matrix-org/synapse#14610))
- Switch to Go recommended installation method for `gotestfmt` template in CI. ([\#14611](matrix-org/synapse#14611))
- Bump phonenumbers from 8.13.0 to 8.13.1. ([\#14612](matrix-org/synapse#14612))
- Bump types-setuptools from 65.5.0.3 to 65.6.0.1. ([\#14613](matrix-org/synapse#14613))
- Bump twine from 4.0.1 to 4.0.2. ([\#14614](matrix-org/synapse#14614))
- Bump types-requests from 2.28.11.2 to 2.28.11.5. ([\#14615](matrix-org/synapse#14615))
- Bump cryptography from 38.0.3 to 38.0.4. ([\#14616](matrix-org/synapse#14616))
- Remove useless cargo install with apt from Dockerfile. ([\#14636](matrix-org/synapse#14636))
- Bump certifi from 2021.10.8 to 2022.12.7. ([\#14645](matrix-org/synapse#14645))
- Bump flake8-bugbear from 22.10.27 to 22.12.6. ([\#14656](matrix-org/synapse#14656))
- Bump packaging from 21.3 to 22.0. ([\#14657](matrix-org/synapse#14657))
- Bump types-pillow from 9.3.0.1 to 9.3.0.4. ([\#14658](matrix-org/synapse#14658))
- Bump serde from 1.0.148 to 1.0.150. ([\#14659](matrix-org/synapse#14659))
- Bump phonenumbers from 8.13.1 to 8.13.2. ([\#14660](matrix-org/synapse#14660))
- Bump authlib from 1.1.0 to 1.2.0. ([\#14661](matrix-org/synapse#14661))
- Move `StateFilter` to `synapse.types`. ([\#14668](matrix-org/synapse#14668))
- Improve type hints. ([\#14597](matrix-org/synapse#14597), [\#14646](matrix-org/synapse#14646), [\#14671](matrix-org/synapse#14671))
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@clokep clokep clokep approved these changes

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Schema deltas are no longer transactional on sqlite
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@squahtx @clokep @DMRobertson