- Remove legacy unspecced `knock_state_events` field returned in some responses. ([\#16403](https://github.com/matrix-org/synapse/issues/16403))

- Fix a bug introduced in Synapse 1.81.0 where an `AttributeError` would be raised when `_matrix/client/v3/account/whoami` is called over a unix socket. Contributed by @Sir-Photch. ([\#16404](https://github.com/matrix-org/synapse/issues/16404))
- Properly return inline media when content types have parameters. ([\#16440](https://github.com/matrix-org/synapse/issues/16440))
- Prevent the purging of large rooms from timing out when Postgres is in use. The timeout which causes this issue was introduced in Synapse 1.88.0. ([\#16455](https://github.com/matrix-org/synapse/issues/16455))
- Improve the performance of purging rooms, particularly encrypted rooms. ([\#16457](https://github.com/matrix-org/synapse/issues/16457))
- Fix a bug introduced in Synapse 1.59.0 where servers could be incorrectly marked as available after an error response was received. ([\#16506](https://github.com/matrix-org/synapse/issues/16506))

- Document internal background update mechanism. ([\#16420](https://github.com/matrix-org/synapse/issues/16420))
- Fix a typo in the sql for [useful SQL for admins document](https://matrix-org.github.io/synapse/latest/usage/administration/useful_sql_for_admins.html). ([\#16477](https://github.com/matrix-org/synapse/issues/16477))

- Bump pyo3 from 0.17.1 to 0.19.2. ([\#16162](https://github.com/matrix-org/synapse/issues/16162))
- Update registration of media repository URLs. ([\#16419](https://github.com/matrix-org/synapse/issues/16419))
- Improve type hints. ([\#16421](https://github.com/matrix-org/synapse/issues/16421), [\#16468](https://github.com/matrix-org/synapse/issues/16468), [\#16469](https://github.com/matrix-org/synapse/issues/16469), [\#16507](https://github.com/matrix-org/synapse/issues/16507))
- Refactor some code to simplify and better type receipts stream adjacent code. ([\#16426](https://github.com/matrix-org/synapse/issues/16426))
- Factor out `MultiWriter` token from `RoomStreamToken`. ([\#16427](https://github.com/matrix-org/synapse/issues/16427))
- Improve code comments. ([\#16428](https://github.com/matrix-org/synapse/issues/16428))
- Reduce memory allocations. ([\#16429](https://github.com/matrix-org/synapse/issues/16429), [\#16431](https://github.com/matrix-org/synapse/issues/16431), [\#16433](https://github.com/matrix-org/synapse/issues/16433), [\#16434](https://github.com/matrix-org/synapse/issues/16434), [\#16438](https://github.com/matrix-org/synapse/issues/16438), [\#16444](https://github.com/matrix-org/synapse/issues/16444))
- Remove unused method. ([\#16435](https://github.com/matrix-org/synapse/issues/16435))
- Improve rate limiting logic. ([\#16441](https://github.com/matrix-org/synapse/issues/16441))
- Do not block running of CI behind the check for sign-off on PRs. ([\#16454](https://github.com/matrix-org/synapse/issues/16454))
- Update the release script to remind releaser to check for special release notes. ([\#16461](https://github.com/matrix-org/synapse/issues/16461))
- Update complement.sh to match new public API shape. ([\#16466](https://github.com/matrix-org/synapse/issues/16466))
- Clean up logging on event persister endpoints. ([\#16488](https://github.com/matrix-org/synapse/issues/16488))
- Remove useless async job to delete device messages on sync, since we only deliver (and hence delete) up to 100 device messages at a time. ([\#16491](https://github.com/matrix-org/synapse/issues/16491))

* Bump bleach from 6.0.0 to 6.1.0. ([\#16451](https://github.com/matrix-org/synapse/issues/16451))
* Bump jsonschema from 4.19.0 to 4.19.1. ([\#16500](https://github.com/matrix-org/synapse/issues/16500))
* Bump netaddr from 0.8.0 to 0.9.0. ([\#16453](https://github.com/matrix-org/synapse/issues/16453))
* Bump packaging from 23.1 to 23.2. ([\#16497](https://github.com/matrix-org/synapse/issues/16497))
* Bump pillow from 10.0.1 to 10.1.0. ([\#16498](https://github.com/matrix-org/synapse/issues/16498))
* Bump psycopg2 from 2.9.8 to 2.9.9. ([\#16452](https://github.com/matrix-org/synapse/issues/16452))
* Bump pyo3-log from 0.8.3 to 0.8.4. ([\#16495](https://github.com/matrix-org/synapse/issues/16495))
* Bump ruff from 0.0.290 to 0.0.292. ([\#16449](https://github.com/matrix-org/synapse/issues/16449))
* Bump sentry-sdk from 1.31.0 to 1.32.0. ([\#16496](https://github.com/matrix-org/synapse/issues/16496))
* Bump serde from 1.0.188 to 1.0.189. ([\#16494](https://github.com/matrix-org/synapse/issues/16494))
* Bump types-bleach from 6.0.0.4 to 6.1.0.0. ([\#16450](https://github.com/matrix-org/synapse/issues/16450))
* Bump types-jsonschema from 4.17.0.10 to 4.19.0.3. ([\#16499](https://github.com/matrix-org/synapse/issues/16499))
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