- Scope transaction IDs to devices (implement [MSC3970](https://github.com/matrix-org/matrix-spec-proposals/pull/3970)). ([\#15629](https://github.com/matrix-org/synapse/issues/15629))

- Remove old rows from the `cache_invalidation_stream_by_instance` table automatically (this table is unused in SQLite). ([\#15868](https://github.com/matrix-org/synapse/issues/15868))

- Fix a long-standing bug where purging history and paginating simultaneously could lead to database corruption when using workers. ([\#15791](https://github.com/matrix-org/synapse/issues/15791))
- Fix a long-standing bug where profile endpoint returned a 404 when the user's display name was empty. ([\#16012](https://github.com/matrix-org/synapse/issues/16012))
- Fix a long-standing bug where the `synapse_port_db` failed to configure sequences for application services and partial stated rooms. ([\#16043](https://github.com/matrix-org/synapse/issues/16043))
- Fix long-standing bug with deletion in dehydrated devices v2. ([\#16046](https://github.com/matrix-org/synapse/issues/16046))

- Add `org.opencontainers.image.version` labels to Docker containers [published by Matrix.org](https://hub.docker.com/r/matrixdotorg/synapse). Contributed by Mo Balaa. ([\#15972](https://github.com/matrix-org/synapse/issues/15972), [\#16009](https://github.com/matrix-org/synapse/issues/16009))

- Add a internal documentation page describing the ["streams" used within Synapse](https://matrix-org.github.io/synapse/v1.90/development/synapse_architecture/streams.html). ([\#16015](https://github.com/matrix-org/synapse/issues/16015))
- Clarify comment on the keys/upload over replication enpoint. ([\#16016](https://github.com/matrix-org/synapse/issues/16016))
- Do not expose Admin API in caddy reverse proxy example. Contributed by @NilsIrl. ([\#16027](https://github.com/matrix-org/synapse/issues/16027))

- Remove support for legacy application service paths. ([\#15964](https://github.com/matrix-org/synapse/issues/15964))
- Move support for application service query parameter authorization behind a configuration option. ([\#16017](https://github.com/matrix-org/synapse/issues/16017))

- Update SQL queries to inline boolean parameters as supported in SQLite 3.27. ([\#15525](https://github.com/matrix-org/synapse/issues/15525))
- Allow for the configuration of the backoff algorithm for federation destinations. ([\#15754](https://github.com/matrix-org/synapse/issues/15754))
- Allow modules to check whether the current worker is configured to run background tasks. ([\#15991](https://github.com/matrix-org/synapse/issues/15991))
- Update support for [MSC3958](https://github.com/matrix-org/matrix-spec-proposals/pull/3958) to match the latest revision of the MSC. ([\#15992](https://github.com/matrix-org/synapse/issues/15992))
- Allow modules to schedule delayed background calls. ([\#15993](https://github.com/matrix-org/synapse/issues/15993))
- Properly overwrite the `redacts` content-property for forwards-compatibility with room versions 1 through 10. ([\#16013](https://github.com/matrix-org/synapse/issues/16013))
- Fix building the nix development environment on MacOS systems. ([\#16019](https://github.com/matrix-org/synapse/issues/16019))
- Remove leading and trailing spaces when setting a display name. ([\#16031](https://github.com/matrix-org/synapse/issues/16031))
- Combine duplicated code. ([\#16023](https://github.com/matrix-org/synapse/issues/16023))
- Collect additional metrics from `ResponseCache` for eviction. ([\#16028](https://github.com/matrix-org/synapse/issues/16028))
- Fix endpoint improperly declaring support for MSC3814. ([\#16068](https://github.com/matrix-org/synapse/issues/16068))
- Drop backwards compat hack for event serialization. ([\#16069](https://github.com/matrix-org/synapse/issues/16069))

* Update PyYAML to 6.0.1. ([\#16011](https://github.com/matrix-org/synapse/issues/16011))
* Bump cryptography from 41.0.2 to 41.0.3. ([\#16048](https://github.com/matrix-org/synapse/issues/16048))
* Bump furo from 2023.5.20 to 2023.7.26. ([\#16077](https://github.com/matrix-org/synapse/issues/16077))
* Bump immutabledict from 2.2.4 to 3.0.0. ([\#16034](https://github.com/matrix-org/synapse/issues/16034))
* Update certifi to 2023.7.22 and pygments to 2.15.1. ([\#16044](https://github.com/matrix-org/synapse/issues/16044))
* Bump jsonschema from 4.18.3 to 4.19.0. ([\#16081](https://github.com/matrix-org/synapse/issues/16081))
* Bump phonenumbers from 8.13.14 to 8.13.18. ([\#16076](https://github.com/matrix-org/synapse/issues/16076))
* Bump regex from 1.9.1 to 1.9.3. ([\#16073](https://github.com/matrix-org/synapse/issues/16073))
* Bump serde from 1.0.171 to 1.0.175. ([\#15982](https://github.com/matrix-org/synapse/issues/15982))
* Bump serde from 1.0.175 to 1.0.179. ([\#16033](https://github.com/matrix-org/synapse/issues/16033))
* Bump serde from 1.0.179 to 1.0.183. ([\#16074](https://github.com/matrix-org/synapse/issues/16074))
* Bump serde_json from 1.0.103 to 1.0.104. ([\#16032](https://github.com/matrix-org/synapse/issues/16032))
* Bump service-identity from 21.1.0 to 23.1.0. ([\#16038](https://github.com/matrix-org/synapse/issues/16038))
* Bump types-commonmark from 0.9.2.3 to 0.9.2.4. ([\#16037](https://github.com/matrix-org/synapse/issues/16037))
* Bump types-jsonschema from 4.17.0.8 to 4.17.0.10. ([\#16036](https://github.com/matrix-org/synapse/issues/16036))
* Bump types-netaddr from 0.8.0.8 to 0.8.0.9. ([\#16035](https://github.com/matrix-org/synapse/issues/16035))
* Bump types-opentracing from 2.4.10.5 to 2.4.10.6. ([\#16078](https://github.com/matrix-org/synapse/issues/16078))
* Bump types-setuptools from 68.0.0.0 to 68.0.0.3. ([\#16079](https://github.com/matrix-org/synapse/issues/16079))
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