Synapse 1.131.0 (2025-06-03)

No significant changes since 1.131.0rc1.

Synapse 1.131.0rc1 (2025-05-28)

Add msc4263_limit_key_queries_to_users_who_share_rooms config option as per MSC4263. (#18180)
Add option to allow registrations that begin with _. Contributed by _ (@hex5f). (#18262)
Include room ID in response to the Room Deletion Status Admin API. (#18318)
Add support for calling Policy Servers (MSC4284) to mark events as spam. (#18387)

Prevent race-condition in _maybe_retry_device_resync entrance. (#18391)
Fix the tests.handlers.test_worker_lock.WorkerLockTestCase.test_lock_contention test which could spuriously time out on RISC-V architectures due to performance differences. (#18430)
Fix admin redaction endpoint not redacting encrypted messages. (#18434)

Update room_list_publication_rules docs to consider defaults that changed in v1.126.0. Contributed by @HarHarLinks. (#18286)
Add advice for upgrading between major PostgreSQL versions to the database documentation. (#18445)

Fix a memory leak in _NotifierUserStream. (#18380)
Fix a couple type annotations in the RootConfig/Config. (#18409)
Explicitly enable PyPy builds in cibuildwheels config to avoid it being disabled on a future upgrade to cibuildwheel v3. (#18417)
Update the PR review template to remove an erroneous line break from the final bullet point. (#18419)
Explain why we flush_buffer() for Python print(...) output. (#18420)
Add lint to ensure we don't add a CREATE/DROP INDEX in a schema delta. (#18440)
Allow checking only for the existence of a field in an SSO provider's response, rather than requiring the value(s) to check. (#18454)
Add unit tests for homeserver usage statistics. (#18463)
Don't move invited users to new room when shutting down room. (#18471)