Issues

• Drop delayed_events_stream_pos table

  A-DatabaseT-TaskZ-Future-Maintenance
  element-hq/synapse#20311 · Filter by author AndrewFerr opened on Oct 5, 2026

• Allow hidden experimental config documentation

  A-ConfigA-DocsT-EnhancementT-ExperimentalFeature
  element-hq/synapse#20310 · Filter by author AndrewFerr opened on Oct 5, 2026

• Pydantic error messages present in responses

  A-ValidationT-Enhancement
  element-hq/synapse#20309 · Filter by author AndrewFerr opened on Oct 5, 2026

• Stream positions end up ahead of Postgres sequences after a failover and fail-back (IncorrectDatabaseSetup, stuck sliding sync to-device)

  A-DatabaseA-Device-List-TrackingT-Defect
  element-hq/synapse#20305 · Filter by author perfectra1n opened on Oct 2, 2026
  1

• Our stream tables could store instance_id instead of instance_name to save on disk space and sharded token translation costs

  A-DatabaseA-Disk-Space
  element-hq/synapse#20304 · Filter by author reivilibre opened on Oct 2, 2026
  1

• Sytest run in Twisted trunk workflow is consistently failing

  A-CIA-Testing
  element-hq/synapse#20292 · Filter by author anoadragon453 opened on Sep 30, 2026
  1

• Synapse pins transitive dependencies which can be eventually dropped by direct dependencies

  A-Packaging
  element-hq/synapse#20290 · Filter by author anoadragon453 opened on Sep 30, 2026
  5

• CI run against Twisted trunk is failing

  A-CIA-Testing
  element-hq/synapse#20288 · Filter by author github-actions opened on Sep 30, 2026

• SerializationFailure retries exhausted when trying to reset Sliding Sync connection

  A-DatabaseA-SyncT-Defect
  element-hq/synapse#20284 · Filter by author MadLittleMods opened on Sep 28, 2026
  1

• Documented allow_underscore_prefixed_registration is never read; the code reads allow_underscore_prefixed_localpart

  A-ConfigA-Docs
  element-hq/synapse#20281 · Filter by author Santoshkumarpuppala opened on Sep 27, 2026

• MSC4222 state_after loses membership changes when a lazy-loading client re-syncs from an older token

  A-Lazy-LoadingA-SyncT-Defect
  element-hq/synapse#20278 · Filter by author ara4n opened on Sep 26, 2026

• Postgres sequence un_partial_stated_room_stream_sequence is inconsistent with associated stream position

  A-DatabaseA-PortdbT-Defect
  element-hq/synapse#20277 · Filter by author 48lexR opened on Sep 26, 2026
  1

• Sliding sync: sliding_sync_connection_required_state pruning races with a concurrent request, causing a ForeignKeyViolation (500)

  A-DatabaseA-Sync
  element-hq/synapse#20275 · Filter by author MadLittleMods opened on Sep 25, 2026
  1

• Simplified sliding sync (MSC4186) returns 500 instead of 400 when an appservice-masqueraded request has no device_id

  A-Application-ServiceA-Sync
  element-hq/synapse#20265 · Filter by author andrimuhyidin opened on Sep 24, 2026
  1

• Whitespace in room alias leads to error

  A-Room-Directory
  element-hq/synapse#20261 · Filter by author ClFeSc opened on Sep 23, 2026
  1

• [Epic] MSC4140: Cancellable Delayed Events

  A-Delayed-EventsZ-Epic
  element-hq/synapse#20254 · Filter by author barodeur opened on Sep 22, 2026

• Anticipated performance problems in message retention

  A-Message-Retention-PoliciesA-PerformanceA-RetentionZ-Uncertain
  element-hq/synapse#20248 · Filter by author reivilibre opened on Sep 21, 2026

• [Epic] Efficient Server Announcements

  A-Admin-APIT-Enhancement
  element-hq/synapse#20240 · Filter by author anoadragon453 opened on Sep 18, 2026
  4

  

• Sliding sync: ForeignKeyViolation on sliding_sync_connection_room_configs_required_state_id_fkey (the only non-cascading FK in that table group)

  A-DatabaseA-SyncT-Defect
  element-hq/synapse#20234 · Filter by author vkrmch opened on Sep 17, 2026
  11

• How to improve message search

  A-Message-SearchA-Search
  element-hq/synapse#20223 · Filter by author shining opened on Sep 15, 2026

• Stuck room: cannot leave (silently fails), cannot rejoin (403 duplicate auth_events), admin kick also fails

  A-JoinA-LeaveT-Defect
  element-hq/synapse#20222 · Filter by author xenomorphpt opened on Sep 15, 2026
  2

• Validate MSC4426 User Status profile fields

  A-ProfilesS-MinorZ-Unimplemented-MSCs
  element-hq/synapse#20206 · Filter by author jaywink opened on Sep 10, 2026
  

• MSC4536 endpoints to fetch many profiles at once

  A-ProfilesA-SyncZ-Unimplemented-MSCs
  element-hq/synapse#20197 · Filter by author jaywink opened on Sep 8, 2026
  

• Unhandled IndexError in guest-macaroon auth path returns 500 instead of 401 for tokens that base64-decode to empty

  A-ValidationT-Defect
  element-hq/synapse#20188 · Filter by author KITLAB13 opened on Sep 5, 2026

• Worker-mode redis/replication connection fails on IPv6-only (AAAA-only) hosts — txredisapi resolver is IPv4-only

  A-Workers
  element-hq/synapse#20184 · Filter by author ixcans opened on Sep 3, 2026
  2