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Slavi Pantaleev 5901f491f4 matrix-synapse: support quarantined_media_changes stream writers
Synapse v1.152 introduces a new `quarantined_media_changes` stream and
requires that any worker serving `/_synapse/admin/v1/quarantine_media/`
be declared as a writer for that stream. Otherwise quarantining media
fails on the worker.

Add `quarantined_media_changes` as a web-facing stream writer alongside
the other stream-backed APIs and route the admin endpoint via the same
explicit writer-or-main model used for `device_lists`, `thread_subscriptions`,
etc. The endpoint is removed from `matrix_synapse_workers_media_repository_endpoints`
so the old media-repository route does not shadow (or conflict with) the
new writer-or-main route. Without that move, the previously-shipping
default of routing `/quarantine_media` to the `media_repository` worker
would silently break after the v1.152.0 image bump.

Default count is 1 in the `one-of-each` and `specialized-workers` presets
(matching `device_lists`), and 0 in `little-federation-helper` (which
also has no media-repository worker, so falling back to main is fine).

Refs:
- https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11520
- https://element-hq.github.io/synapse/latest/workers.html#the-quarantined_media_changes-stream

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-30 14:12:25 +03:00
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