💄(frontend) position the login hint dynamically next to the button

Compute the position of the login hint at render time so it is
always displayed close to the login button, regardless of the
button's placement or the current viewport size.

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to
 - ✨(frontend) add 1080p sending resolution option #1660
 - ✨(backend) add Traefik support via configurable media-auth url header #1649
 - ✨(backend) update a room's attributes from the external API
+- 🔊(backend) log request duration in Gunicorn workers
+- 📈(frontend) track missing lobby participant on accept/reject
 
 ### Changed
 
@@ -22,6 +24,13 @@ and this project adheres to
 
 - 🐛(backend) allow any printable ASCII characters in user sub field #1673
 - 🐛(frontend) keep the sending resolution picked while the camera is off #1667
+- 🐛(frontend) restore automatic lower-hand on speaking
+- 🐛(frontend) center Avatar initials with a font-aware cap-height ratio
+- ⚡️(frontend) increase lobby polling interval on both sides
+- ⚡️(frontend) add trailing slash on the /me endpoint call
+- ⚡️(backend) refactor lobby storage to bound key lookups per room
+- ⚡️(backend) refactor presence cache to bound key lookups per room
+- 💄(frontend) position the login hint dynamically next to the button
 
 ## [1.30.0] - 2026-09-01
 

docker/dinum-frontend/dinum-styles.css

@@ -1,5 +1,6 @@
 :root {
     --fonts-sans: 'Marianne', ui-sans-serif, system-ui, sans-serif;
+    --avatar-cap-height: 0.7;
 }
 
 .Header-beforeLogo {

docker/files/usr/local/etc/gunicorn/meet.py

@@ -14,3 +14,4 @@ accesslog = "-"
 # Using '-' for the error log file makes gunicorn log errors to stderr
 errorlog = "-"
 loglevel = "info"
+access_log_format = '%(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s" %(M)s'

docs/theming.md

@@ -34,6 +34,7 @@ Let's say you want to change the font of our application to a custom font. You c
 
 :root {
   --fonts-sans: 'Roboto', ui-sans-serif, system-ui, sans-serif;
+  --avatar-cap-height: 0.7;
 }
 ```
 

src/backend/core/services/lobby.py

@@ -79,6 +79,14 @@ class LobbyService:
 
     Handles participant entry requests, status management, and notifications
     using cache for state management and LiveKit for real-time updates.
+
+    Participant membership per room is tracked in a native Redis SET (the
+    "room index") so that listing and clearing a room's lobby never scans
+    the shared keyspace. The per-participant cache entries remain the source
+    of truth for state: their TTLs implement liveness (a waiter who stops
+    polling simply expires). The index only records which participant ids
+    may exist for a room; a stale id costs one cache miss and is pruned
+    lazily.
     """
 
     @staticmethod
@@ -86,6 +94,61 @@ class LobbyService:
         """Generate cache key for participant(s) data."""
         return f"{settings.LOBBY_KEY_PREFIX}_{room_id!s}_{participant_id}"
 
+    @staticmethod
+    def _get_index_key(room_id: UUID) -> str:
+        """Raw Redis key of the per-room participant index (a native SET).
+
+        Built through django-redis' make_key so it lives under the same
+        KEY_PREFIX/version namespace as the participant entries.
+        """
+        return cache.client.make_key(f"{settings.LOBBY_KEY_PREFIX}-index_{room_id!s}")
+
+    @staticmethod
+    def _redis(write: bool = True):
+        """Raw redis-py client.
+
+        SADD/SREM/SMEMBERS are not exposed by the Django cache API; this is
+        the documented django-redis escape hatch.
+        """
+        return cache.client.get_client(write=write)
+
+    def _index_add(self, room_id: UUID, participant_id: str) -> None:
+        """Record a participant id in the room index.
+
+        Refreshes a backstop TTL on the index so an abandoned room cannot
+        leak its set beyond the longest participant timeout.
+        """
+        index_key = self._get_index_key(room_id)
+        pipe = self._redis().pipeline(transaction=False)
+        pipe.sadd(index_key, participant_id)
+        pipe.expire(index_key, settings.LOBBY_ACCEPTED_TIMEOUT)
+        pipe.execute()
+
+    def _index_members(self, room_id: UUID) -> List[str]:
+        """All participant ids currently indexed for the room."""
+        members = self._redis(write=False).smembers(self._get_index_key(room_id))
+        return [
+            member.decode() if isinstance(member, bytes) else member
+            for member in members
+        ]
+
+    def _index_touch(self, room_id: UUID) -> None:
+        """Re-arm the room index backstop TTL.
+
+        Called whenever a participant entry is written or refreshed so the
+        index always outlives every entry it references — including a lone
+        waiter whose rolling WAITING TTL would otherwise outlast the
+        backstop set at enter() time.
+        """
+        self._redis().expire(
+            self._get_index_key(room_id), settings.LOBBY_ACCEPTED_TIMEOUT
+        )
+
+    def _index_remove(self, room_id: UUID, *participant_ids: str) -> None:
+        """Drop participant ids from the room index."""
+        if participant_ids:
+            self._redis().srem(self._get_index_key(room_id), *participant_ids)
+
     @staticmethod
     def _get_or_create_participant_id(request) -> str:
         """Extract unique participant identifier from the request."""
@@ -209,14 +272,16 @@ class LobbyService:
         cache.touch(
             self._get_cache_key(room_id, participant_id), settings.LOBBY_WAITING_TIMEOUT
         )
+        self._index_touch(room_id)
 
     def enter(
         self, room_id: UUID, participant_id: str, username: str
     ) -> LobbyParticipant:
         """Add participant to waiting lobby.
 
-        Create a new participant entry in waiting status and notify room
-        participants of the new entry request.
+        Create a new participant entry in waiting status, index the
+        participant id for the room, and notify room participants of the
+        new entry request.
         """
 
         color = utils.generate_color(participant_id)
@@ -245,6 +310,7 @@ class LobbyService:
             participant.to_dict(),
             timeout=settings.LOBBY_WAITING_TIMEOUT,
         )
+        self._index_add(room_id, participant_id)
 
         return participant
 
@@ -267,15 +333,31 @@ class LobbyService:
             return None
 
     def list_waiting_participants(self, room_id: UUID) -> List[dict]:
-        """List all waiting participants for a room."""
+        """List all waiting participants for a room.
 
-        pattern = self._get_cache_key(room_id, "*")
-        keys = list(cache.iter_keys(pattern, itersize=utils.CACHE_SCAN_ITERSIZE))
+        Reads the per-room index (O(participants of this room)) instead of
+        scanning the shared keyspace. Indexed ids whose cache entry has
+        expired are pruned lazily here: the entry TTL is the liveness
+        protocol, so a missing entry means the participant is gone.
+        """
 
-        if not keys:
+        member_ids = self._index_members(room_id)
+
+        if not member_ids:
             return []
 
-        data = cache.get_many(keys)
+        keys_by_id = {
+            participant_id: self._get_cache_key(room_id, participant_id)
+            for participant_id in member_ids
+        }
+        data = cache.get_many(list(keys_by_id.values()))
+
+        dead_ids = [
+            participant_id
+            for participant_id, cache_key in keys_by_id.items()
+            if cache_key not in data
+        ]
+        self._index_remove(room_id, *dead_ids)
 
         waiting_participants = []
         for cache_key, raw_participant in data.items():
@@ -341,16 +423,28 @@ class LobbyService:
 
         participant.status = status
         cache.set(cache_key, participant.to_dict(), timeout=timeout)
+        self._index_touch(room_id)
 
     def clear_room_cache(self, room_id: UUID) -> None:
-        """Clear all participant entries from the cache for a specific room."""
+        """Clear all participant entries from the cache for a specific room.
 
-        cache.delete_pattern(
-            self._get_cache_key(room_id, "*"), itersize=utils.CACHE_SCAN_ITERSIZE
+        Deletes the indexed participant entries and the index itself with
+        targeted commands instead of a full-keyspace pattern scan.
+        """
+
+        member_ids = self._index_members(room_id)
+        if member_ids:
+            cache.delete_many(
+                [
+                    self._get_cache_key(room_id, participant_id)
+                    for participant_id in member_ids
+                ]
             )
+        self._redis().delete(self._get_index_key(room_id))
 
     def clear_participant_cache(self, room_id: UUID, participant_id: str) -> None:
         """Clear a given participant entry from the cache for a specific room."""
 
         cache_key = self._get_cache_key(room_id, participant_id)
         cache.delete(cache_key)
+        self._index_remove(room_id, participant_id)

src/backend/core/services/presence.py

@@ -1,25 +1,11 @@
-"""Presence cache.
-
-Redis-backed memo of "this identity is currently connected to this room".
-
-This module is intentionally a *pure cache store* with no dependency on other
-services, so that `participants_management` (which talks to LiveKit) can
-import it without creating an import cycle. The composition of "check cache,
-fall back to LiveKit" lives in
-`ParticipantsManagement.check_if_in_meeting_cached`.
-
-Only positive answers are stored: a sticky negative would lock out someone
-who joins right after a miss for the whole TTL. The TTL is a safety net in
-case an invalidation webhook is lost.
-"""
+"""Presence cache."""
 
+from typing import List
 from uuid import UUID
 
 from django.conf import settings
 from django.core.cache import cache
 
-from core.utils import CACHE_SCAN_ITERSIZE
-
 
 class PresenceCache:
     """Store and invalidate (room, identity) presence entries."""
@@ -29,24 +15,65 @@ class PresenceCache:
         """Cache key for a (room, identity) presence entry."""
         return f"{settings.PRESENCE_KEY_PREFIX}_{room_id!s}_{identity}"
 
+    @staticmethod
+    def _get_index_key(room_id: UUID | str) -> str:
+        """Raw Redis key of the per-room identity index (a native SET).
+
+        Built through django-redis' make_key so it lives under the same
+        KEY_PREFIX/version namespace as the presence entries.
+        """
+        return cache.client.make_key(
+            f"{settings.PRESENCE_KEY_PREFIX}-index_{room_id!s}"
+        )
+
+    @staticmethod
+    def _redis(write: bool = True):
+        """Raw redis-py client.
+
+        SADD/SREM/SMEMBERS are not exposed by the Django cache API; this is
+        the documented django-redis escape hatch.
+        """
+        return cache.client.get_client(write=write)
+
+    def _index_members(self, room_id: UUID | str) -> List[str]:
+        """All identities currently indexed for the room."""
+        members = self._redis(write=False).smembers(self._get_index_key(room_id))
+        return [
+            member.decode() if isinstance(member, bytes) else member
+            for member in members
+        ]
+
     def is_marked_present(self, room_id: UUID | str, identity: str) -> bool:
         """Return True if a positive presence entry exists in cache."""
         return bool(cache.get(self._get_cache_key(room_id, identity)))
 
     def mark_present(self, room_id: UUID | str, identity: str) -> None:
-        """Record that `identity` is in `room_id`."""
+        """Record that `identity` is in `room_id` and index it for the room."""
         cache.set(
             self._get_cache_key(room_id, identity),
             True,
             timeout=settings.PRESENCE_CACHE_TIMEOUT,
         )
+        index_key = self._get_index_key(room_id)
+        pipe = self._redis().pipeline(transaction=False)
+        pipe.sadd(index_key, identity)
+        pipe.expire(index_key, settings.PRESENCE_CACHE_TIMEOUT)
+        pipe.execute()
 
     def clear(self, room_id: UUID | str, identity: str) -> None:
         """Forget presence for one participant (e.g. on participant_left)."""
         cache.delete(self._get_cache_key(room_id, identity))
+        self._redis().srem(self._get_index_key(room_id), identity)
 
     def clear_room(self, room_id: UUID | str) -> None:
-        """Forget presence for every participant of a room (on room_finished)."""
-        cache.delete_pattern(
-            self._get_cache_key(room_id, "*"), itersize=CACHE_SCAN_ITERSIZE
+        """Forget presence for every participant of a room (on room_finished).
+
+        Deletes the indexed entries and the index itself with targeted
+        commands instead of a full-keyspace pattern scan.
+        """
+        identities = self._index_members(room_id)
+        if identities:
+            cache.delete_many(
+                [self._get_cache_key(room_id, identity) for identity in identities]
             )
+        self._redis().delete(self._get_index_key(room_id))

src/backend/core/tests/rooms/test_api_rooms_lobby.py

@@ -589,6 +589,9 @@ def test_list_waiting_participants_success(settings):
             "color": "#654321",
         },
     )
+    lobby_service = LobbyService()
+    lobby_service._index_add(room.id, "2f7f162f-e7d1-421b-90e7-02bfbfbf8def")
+    lobby_service._index_add(room.id, "f4ca3ab8a6c04ad88097b8da33f60f10")
 
     response = client.get(f"/api/v1.0/rooms/{room.id}/waiting-participants/")
 

src/backend/core/tests/services/test_lobby.py

@@ -2,7 +2,7 @@
 Test lobby service.
 """
 
-# pylint: disable=W0621,W0613, W0212, R0913
+# pylint: disable=W0621,W0613, W0212, R0913, C0302
 # ruff: noqa: PLR0913, PLR0917
 
 import uuid
@@ -24,7 +24,6 @@ from core.services.lobby import (
     LobbyParticipantStatus,
     LobbyService,
 )
-from core.services.presence import CACHE_SCAN_ITERSIZE
 from core.utils import NotificationError
 
 pytestmark = pytest.mark.django_db
@@ -466,18 +465,22 @@ def test_request_entry_participant_with_role(
 def test_refresh_waiting_status(mock_cache, lobby_service, participant_id):
     """Test refreshing waiting status for a participant."""
     lobby_service._get_cache_key = mock.Mock(return_value="mocked_cache_key")
+    lobby_service._index_touch = mock.Mock()
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     lobby_service.refresh_waiting_status(room.id, participant_id)
     mock_cache.touch.assert_called_once_with(
         "mocked_cache_key", settings.LOBBY_WAITING_TIMEOUT
     )
+    lobby_service._index_touch.assert_called_once_with(room.id)
 
 
 # pylint: disable=R0917
 @mock.patch("core.services.lobby.cache")
 @mock.patch("core.utils.generate_color")
 @mock.patch("core.utils.notify_participants")
+@mock.patch("core.services.lobby.LobbyService._index_add")
 def test_enter_success(
+    mock_index_add,
     mock_notify,
     mock_generate_color,
     mock_cache,
@@ -508,13 +511,16 @@ def test_enter_success(
     mock_notify.assert_called_once_with(
         room_name=str(room.pk), notification_data={"type": "participantWaiting"}
     )
+    mock_index_add.assert_called_once_with(room.id, participant_id)
 
 
 # pylint: disable=R0917
 @mock.patch("core.services.lobby.cache")
 @mock.patch("core.utils.generate_color")
 @mock.patch("core.utils.notify_participants")
+@mock.patch("core.services.lobby.LobbyService._index_add")
 def test_enter_with_notification_error(
+    mock_index_add,
     mock_notify,
     mock_generate_color,
     mock_cache,
@@ -541,6 +547,7 @@ def test_enter_with_notification_error(
         participant.to_dict(),
         timeout=settings.LOBBY_WAITING_TIMEOUT,
     )
+    mock_index_add.assert_called_once_with(room.id, participant_id)
 
 
 @mock.patch("core.services.lobby.cache")
@@ -579,14 +586,15 @@ def test_get_participant_parsing_error(
 @mock.patch("core.services.lobby.cache")
 def test_list_waiting_participants_empty(mock_cache, lobby_service):
     """Test listing waiting participants when none exist."""
-    mock_cache.iter_keys.return_value = []
-
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
+    lobby_service._index_members = mock.Mock(return_value=[])
+    lobby_service._index_remove = mock.Mock()
+
     result = lobby_service.list_waiting_participants(room.id)
 
     assert result == []
-    pattern = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_*"
-    mock_cache.iter_keys.assert_called_once_with(pattern, itersize=CACHE_SCAN_ITERSIZE)
+    lobby_service._index_members.assert_called_once_with(room.id)
+    lobby_service._index_remove.assert_not_called()
     mock_cache.get_many.assert_not_called()
 
 
@@ -595,7 +603,8 @@ def test_list_waiting_participants(mock_cache, lobby_service, participant_dict):
     """Test listing waiting participants with valid data."""
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     cache_key = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_participant1"
-    mock_cache.iter_keys.return_value = [cache_key]
+    lobby_service._index_members = mock.Mock(return_value=["participant1"])
+    lobby_service._index_remove = mock.Mock()
     mock_cache.get_many.return_value = {cache_key: participant_dict}
 
     result = lobby_service.list_waiting_participants(room.id)
@@ -603,8 +612,8 @@ def test_list_waiting_participants(mock_cache, lobby_service, participant_dict):
     assert len(result) == 1
     assert result[0]["status"] == "waiting"
     assert result[0]["username"] == "test-username"
-    pattern = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_*"
-    mock_cache.iter_keys.assert_called_once_with(pattern, itersize=CACHE_SCAN_ITERSIZE)
+    lobby_service._index_members.assert_called_once_with(room.id)
+    lobby_service._index_remove.assert_called_once_with(room.id)
     mock_cache.get_many.assert_called_once_with([cache_key])
 
 
@@ -629,7 +638,10 @@ def test_list_waiting_participants_multiple(mock_cache, lobby_service):
         "color": "#654321",
     }
 
-    mock_cache.iter_keys.return_value = [cache_key1, cache_key2]
+    lobby_service._index_members = mock.Mock(
+        return_value=["participant1", "participant2"]
+    )
+    lobby_service._index_remove = mock.Mock()
     mock_cache.get_many.return_value = {
         cache_key1: participant1,
         cache_key2: participant2,
@@ -646,8 +658,7 @@ def test_list_waiting_participants_multiple(mock_cache, lobby_service):
     # Verify all participants have waiting status
     assert all(p["status"] == "waiting" for p in result)
 
-    pattern = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_*"
-    mock_cache.iter_keys.assert_called_once_with(pattern, itersize=CACHE_SCAN_ITERSIZE)
+    lobby_service._index_members.assert_called_once_with(room.id)
     mock_cache.get_many.assert_called_once_with([cache_key1, cache_key2])
 
 
@@ -656,7 +667,8 @@ def test_list_waiting_participants_corrupted_data(mock_cache, lobby_service):
     """Test listing waiting participants with corrupted data."""
     room = RoomFactory(access_level=RoomAccessLevel.RESTRICTED)
     cache_key = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_participant1"
-    mock_cache.iter_keys.return_value = [cache_key]
+    lobby_service._index_members = mock.Mock(return_value=["participant1"])
+    lobby_service._index_remove = mock.Mock()
     mock_cache.get_many.return_value = {cache_key: {"invalid": "data"}}
 
     result = lobby_service.list_waiting_participants(room.id)
@@ -681,7 +693,10 @@ def test_list_waiting_participants_partially_corrupted(mock_cache, lobby_service
 
     corrupted_participant = {"invalid": "data"}
 
-    mock_cache.iter_keys.return_value = [cache_key1, cache_key2]
+    lobby_service._index_members = mock.Mock(
+        return_value=["participant1", "participant2"]
+    )
+    lobby_service._index_remove = mock.Mock()
     mock_cache.get_many.return_value = {
         cache_key1: corrupted_participant,
         cache_key2: valid_participant,
@@ -699,8 +714,6 @@ def test_list_waiting_participants_partially_corrupted(mock_cache, lobby_service
     mock_cache.delete.assert_called_once_with(cache_key1)
 
     # Verify both cache keys were queried
-    pattern = f"{settings.LOBBY_KEY_PREFIX}_{room.id!s}_*"
-    mock_cache.iter_keys.assert_called_once_with(pattern, itersize=CACHE_SCAN_ITERSIZE)
     mock_cache.get_many.assert_called_once_with([cache_key1, cache_key2])
 
 
@@ -724,7 +737,10 @@ def test_list_waiting_participants_non_waiting(mock_cache, lobby_service):
         "color": "#654321",
     }
 
-    mock_cache.iter_keys.return_value = [cache_key1, cache_key2]
+    lobby_service._index_members = mock.Mock(
+        return_value=["participant1", "participant2"]
+    )
+    lobby_service._index_remove = mock.Mock()
     mock_cache.get_many.return_value = {
         cache_key1: participant1,
         cache_key2: participant2,
@@ -820,6 +836,7 @@ def test_update_participant_status_success(mock_cache, lobby_service, participan
 
     mock_cache.get.return_value = participant_dict
     lobby_service._get_cache_key = mock.Mock(return_value="mocked_cache_key")
+    lobby_service._index_touch = mock.Mock()
 
     lobby_service._update_participant_status(
         room.id,
@@ -837,6 +854,7 @@ def test_update_participant_status_success(mock_cache, lobby_service, participan
     mock_cache.set.assert_called_once_with(
         "mocked_cache_key", expected_data, timeout=60
     )
+    lobby_service._index_touch.assert_called_once_with(room.id)
     lobby_service._get_cache_key.assert_called_once_with(room.id, participant_id)
 
 
@@ -881,9 +899,13 @@ def test_clear_room_cache(settings, lobby_service):
         timeout=settings.LOBBY_DENIED_TIMEOUT,
     )
 
+    for participant_id in ("participant1", "participant2", "participant3"):
+        lobby_service._index_add(room_id, participant_id)
+
     lobby_service.clear_room_cache(room_id)
 
     assert cache.keys(f"test-lobby_{room_id!s}_*") == []
+    assert lobby_service._index_members(room_id) == []
 
 
 def test_clear_room_empty(settings, lobby_service):
@@ -910,10 +932,13 @@ def test_clear_participant_cache(lobby_service):
         "color": "#123456",
     }
     cache.set(cache_key, participant_data, timeout=settings.LOBBY_WAITING_TIMEOUT)
+    lobby_service._index_add(room_id, participant_id)
     assert cache.get(cache_key) is not None
+    assert participant_id in lobby_service._index_members(room_id)
 
     lobby_service.clear_participant_cache(room_id, participant_id)
     assert cache.get(cache_key) is None
+    assert participant_id not in lobby_service._index_members(room_id)
 
 
 def test_clear_participant_cache_nonexistent(lobby_service):
@@ -927,3 +952,87 @@ def test_clear_participant_cache_nonexistent(lobby_service):
     lobby_service.clear_participant_cache(room_id, participant_id)
 
     assert cache.get(cache_key) is None
+
+
+# Room index integration tests (real cache backend)
+
+
+def test_index_add_members_remove_roundtrip(lobby_service):
+    """The room index records, lists and forgets participant ids."""
+    room_id = uuid.uuid4()
+
+    assert lobby_service._index_members(room_id) == []
+
+    lobby_service._index_add(room_id, "participant1")
+    lobby_service._index_add(room_id, "participant2")
+
+    assert sorted(lobby_service._index_members(room_id)) == [
+        "participant1",
+        "participant2",
+    ]
+
+    # The index carries a backstop TTL so abandoned rooms cannot leak it.
+    ttl = lobby_service._redis().ttl(lobby_service._get_index_key(room_id))
+    assert 0 < ttl <= settings.LOBBY_ACCEPTED_TIMEOUT
+
+    lobby_service._index_remove(room_id, "participant1")
+    assert lobby_service._index_members(room_id) == ["participant2"]
+
+
+@mock.patch("core.utils.notify_participants")
+def test_enter_registers_participant_in_room_index(
+    mock_notify, lobby_service, participant_id, username
+):
+    """Entering the lobby must index the participant id for the room."""
+    room_id = uuid.uuid4()
+
+    lobby_service.enter(room_id, participant_id, username)
+
+    assert lobby_service._index_members(room_id) == [participant_id]
+
+
+def test_list_waiting_participants_prunes_stale_index_ids(settings, lobby_service):
+    """Indexed ids whose cache entry expired are pruned and not listed."""
+    settings.LOBBY_KEY_PREFIX = "test-lobby-prune"
+    room_id = uuid.uuid4()
+
+    cache.set(
+        f"test-lobby-prune_{room_id!s}_participant1",
+        {
+            "id": "participant1",
+            "username": "user1",
+            "status": "waiting",
+            "color": "#123456",
+        },
+        timeout=100,
+    )
+    lobby_service._index_add(room_id, "participant1")
+    # participant2 is indexed but its cache entry has expired.
+    lobby_service._index_add(room_id, "participant2")
+
+    result = lobby_service.list_waiting_participants(room_id)
+
+    assert [participant["id"] for participant in result] == ["participant1"]
+    assert lobby_service._index_members(room_id) == ["participant1"]
+
+
+def test_refresh_waiting_status_rearms_room_index_ttl(lobby_service, participant_id):
+    """A lone waiter's polling must keep the room index alive.
+
+    Regression test: the index backstop TTL is only armed at enter() time,
+    so a participant whose rolling WAITING refreshes outlast it would keep
+    their entry alive while silently vanishing from the moderator list.
+    Refreshing the waiting status must therefore re-arm the index TTL.
+    """
+    room_id = uuid.uuid4()
+    lobby_service._index_add(room_id, participant_id)
+
+    index_key = lobby_service._get_index_key(room_id)
+    redis_client = lobby_service._redis()
+    redis_client.expire(index_key, 10)
+    assert redis_client.ttl(index_key) <= 10
+
+    lobby_service.refresh_waiting_status(room_id, participant_id)
+
+    assert redis_client.ttl(index_key) > 10
+    assert lobby_service._index_members(room_id) == [participant_id]

src/backend/core/tests/services/test_presence.py

@@ -90,19 +90,18 @@ def test_presence_clear_and_clear_room():
     assert presence.is_marked_present(other_room, "a") is True
 
 
-def test_presence_clear_room_scans_in_pages():
-    """clear_room removes every match, even across several SCAN pages,
-    and only within the room."""
+def test_presence_clear_room_removes_many_entries_and_the_index():
+    """clear_room removes every entry of the room through the index — never
+    a keyspace scan — and leaves other rooms untouched."""
     room_id, other_room = str(uuid4()), str(uuid4())
     presence = PresenceCache()
     for i in range(7):
         presence.mark_present(room_id, f"user-{i}")
     presence.mark_present(other_room, "user-0")
 
-    # An itersize smaller than the match count forces delete_pattern to
-    # page through several SCAN cursors rather than finish in one pass.
-    with mock.patch("core.utils.CACHE_SCAN_ITERSIZE", 3):
     presence.clear_room(room_id)
 
     assert all(not presence.is_marked_present(room_id, f"user-{i}") for i in range(7))
     assert presence.is_marked_present(other_room, "user-0") is True
+    assert presence._index_members(room_id) == []
+    assert presence._index_members(other_room) == ["user-0"]

src/backend/core/utils.py

@@ -499,6 +499,3 @@ def build_telephony_config():
         "default_country": country,
         "international_phone_number": international,
     }
-
-
-CACHE_SCAN_ITERSIZE = 500

src/backend/meet/settings.py

@@ -865,7 +865,7 @@ class Base(Configuration):
         "room_lobby", environ_name="LOBBY_KEY_PREFIX", environ_prefix=None
     )
     LOBBY_WAITING_TIMEOUT = values.PositiveIntegerValue(
-        3, environ_name="LOBBY_WAITING_TIMEOUT", environ_prefix=None
+        6, environ_name="LOBBY_WAITING_TIMEOUT", environ_prefix=None
     )
     LOBBY_DENIED_TIMEOUT = values.PositiveIntegerValue(
         5, environ_name="LOBBY_DENIED_TIMEOUT", environ_prefix=None

src/frontend/src/components/Avatar.tsx

@@ -1,5 +1,5 @@
 import { css, cva, RecipeVariantProps } from '@/styled-system/css'
-import React, { useLayoutEffect, useMemo } from 'react'
+import React, { useMemo } from 'react'
 
 const avatar = cva({
   base: {
@@ -28,24 +28,17 @@ const avatar = cva({
   },
 })
 
-// Instantiating a segmenter is expensive; create it once and reuse it.
 const graphemeSegmenter =
   typeof Intl !== 'undefined' && 'Segmenter' in Intl
     ? new Intl.Segmenter(undefined, { granularity: 'grapheme' })
     : undefined
 
-/**
- * Returns the first user-perceived character. Some Unicode characters span
- * multiple UTF-16 code units, so a naive index into the string can split them
- * and yield a broken glyph.
- */
 const getFirstGrapheme = (value: string): string => {
   if (!value) return ''
   if (graphemeSegmenter) {
     const [first] = graphemeSegmenter.segment(value)
     return first?.segment ?? ''
   }
-  // Fallback: keeps single code points intact (including surrogate pairs).
   return Array.from(value)[0] ?? ''
 }
 
@@ -66,36 +59,6 @@ export type AvatarProps = React.HTMLAttributes<HTMLDivElement> & {
 export const Avatar = React.memo(
   ({ name, bgColor, context, notification, style, ...props }: AvatarProps) => {
     const initials = useMemo(() => getInitials(name), [name])
-    const textRef = React.useRef<SVGTextElement>(null)
-    const [offsetY, setOffsetY] = React.useState(0)
-
-    // Optically center the initials: measure the ink bounding box of the
-    // rendered glyphs and shift them so the box's center sits at the middle
-    // of the viewBox. Works for any font, weight or glyph shape, unlike a
-    // hand-tuned dy offset. getBBox() is in local (pre-transform)
-    // coordinates, so applying the translation never changes the measure.
-    useLayoutEffect(() => {
-      const text = textRef.current
-      if (!text) return
-
-      const center = () => {
-        const box = text.getBBox()
-        // A hidden element measures as an empty box; keep the default then.
-        if (box.height === 0) return
-        setOffsetY(50 - (box.y + box.height / 2))
-      }
-
-      center()
-      // Glyph metrics can change once webfonts finish loading.
-      let cancelled = false
-      document.fonts?.ready.then(() => {
-        if (!cancelled) center()
-      })
-      return () => {
-        cancelled = true
-      }
-    }, [initials])
-
     return (
       <div
         style={{ backgroundColor: bgColor, ...style }}
@@ -108,15 +71,16 @@ export const Avatar = React.memo(
           className={css({ width: '100%', height: '100%', display: 'block' })}
         >
           <text
-            ref={textRef}
             x="50"
-            y="50"
-            transform={`translate(0 ${offsetY})`}
+            y={50}
             textAnchor="middle"
-            dominantBaseline="central"
             fontSize="52"
             fontWeight="500"
             fill="currentColor"
+            className={css({
+              transform:
+                'translateY(calc(var(--avatar-cap-height, 0.7) * 0.5em))',
+            })}
           >
             {initials}
           </text>

src/frontend/src/features/auth/api/fetchUser.ts

@@ -18,7 +18,7 @@ export const fetchUser = (
   }
 ): Promise<ApiUser | false> => {
   return new Promise((resolve, reject) => {
-    fetchApi<ApiUser>('/users/me')
+    fetchApi<ApiUser>('/users/me/')
       .then(resolve)
       .catch((error) => {
         // we assume that a 401 means the user is not logged in

src/frontend/src/features/participants/api/enterRoom.ts

@@ -1,5 +1,6 @@
 import { ApiError } from '@/api/ApiError'
 import { fetchApi } from '@/api/fetchApi'
+import { captureEvent } from '@/features/analytics/telemetry'
 import { useMutation, type UseMutationOptions } from '@tanstack/react-query'
 
 export interface EnterRoomParams {
@@ -17,6 +18,7 @@ export const enterRoom = async ({
   allowEntry,
   participantId,
 }: EnterRoomParams): Promise<EnterRoomResponse> => {
+  try {
     return await fetchApi<EnterRoomResponse>(`/rooms/${roomId}/enter/`, {
       method: 'POST',
       body: JSON.stringify({
@@ -24,6 +26,15 @@ export const enterRoom = async ({
         allow_entry: allowEntry,
       }),
     })
+  } catch (error) {
+    if (error instanceof ApiError && error.statusCode === 404) {
+      captureEvent('lobby_entry_participant_gone', {
+        room_id: roomId,
+        allow_entry: allowEntry,
+      })
+    }
+    throw error
+  }
 }
 
 export function useEnterRoom(

src/frontend/src/features/rooms/components/LobbyProvider.tsx

@@ -12,8 +12,8 @@ import { keys } from '@/api/queryKeys'
 import { queryClient } from '@/api/queryClient'
 import { ApiError } from '@/api/ApiError'
 
-export const POLL_INTERVAL_MS = 1000
-export const LAZY_POLL_INTERVAL_MS = 10_000
+export const POLL_INTERVAL_MS = 4_000
+export const LAZY_POLL_INTERVAL_MS = 15_000
 
 export const LobbyProvider = () => {
   const room = useRoomContext()

src/frontend/src/features/rooms/hooks/useLobby.ts

@@ -8,7 +8,7 @@ import {
 } from '../api/requestEntry'
 
 export const WAIT_TIMEOUT_MS = 600000 // 10 minutes
-export const POLL_INTERVAL_MS = 1000
+export const POLL_INTERVAL_MS = 3_000
 
 export const useLobby = ({
   roomId,

src/frontend/src/features/rooms/livekit/components/controls/HandToggle.tsx

@@ -2,7 +2,7 @@ import { useTranslation } from 'react-i18next'
 import { RiHand } from '@remixicon/react'
 import { ToggleButton } from '@/primitives'
 import { css } from '@/styled-system/css'
-import { useRoomContext } from '@livekit/components-react'
+import { useIsSpeaking, useRoomContext } from '@livekit/components-react'
 import { useRaisedHand } from '@/features/rooms/livekit/hooks/useRaisedHand'
 import { useEffect, useRef, useState } from 'react'
 import {
@@ -25,11 +25,11 @@ export const HandToggle = ({
   const { t } = useTranslation('rooms', { keyPrefix: 'controls.hand' })
 
   const room = useRoomContext()
-  const { isHandRaised, toggleRaisedHand } = useRaisedHand({
+  const { isHandRaised, toggleRaisedHand, lowerHand } = useRaisedHand({
     participant: room.localParticipant,
   })
 
-  const isSpeaking = room.localParticipant.isSpeaking
+  const isSpeaking = useIsSpeaking(room.localParticipant)
   const speakingTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
   const [hasShownToast, setHasShownToast] = useState(false)
 
@@ -57,9 +57,10 @@ export const HandToggle = ({
 
     if (shouldShowToast && !speakingTimerRef.current) {
       speakingTimerRef.current = setTimeout(() => {
+        speakingTimerRef.current = null
         setHasShownToast(true)
         const onClose = () => {
-          if (isHandRaised) toggleRaisedHand()
+          lowerHand()
           resetToastState()
         }
         showLowerHandToast(room.localParticipant, onClose)
@@ -70,7 +71,17 @@ export const HandToggle = ({
       speakingTimerRef.current = null
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [isSpeaking, isHandRaised, hasShownToast, toggleRaisedHand])
+  }, [isSpeaking, isHandRaised, hasShownToast, lowerHand])
+
+  // Clear any pending timer on unmount
+  useEffect(() => {
+    return () => {
+      if (speakingTimerRef.current) {
+        clearTimeout(speakingTimerRef.current)
+        speakingTimerRef.current = null
+      }
+    }
+  }, [])
 
   const tooltipLabel = isHandRaised ? 'lower' : 'raise'
 

src/frontend/src/features/rooms/livekit/hooks/useRaisedHand.ts

@@ -86,5 +86,16 @@ export function useRaisedHand({ participant }: useRaisedHandProps) {
     }
   }
 
-  return { isHandRaised, toggleRaisedHand }
+  const lowerHand = async () => {
+    if (!isLocal(participant)) return
+    try {
+      await raiseHand(false)
+    } catch (e) {
+      reportError('generic_failure', e, {
+        context: 'lower_raised_hand',
+      })
+    }
+  }
+
+  return { isHandRaised, toggleRaisedHand, lowerHand }
 }

src/frontend/src/layout/Header.tsx

@@ -35,30 +35,21 @@ const LoginHint = () => {
     <div
       className={css({
         position: 'absolute',
-        top: '103px',
-        right: '110px',
+        top: 'calc(100% + 12px)',
+        right: 0,
         zIndex: '100',
         outline: 'none',
         padding: '1.25rem',
-        maxWidth: '350px',
+        width: 'max-content',
+        maxWidth: 'min(350px, calc(100vw - 2rem))',
         boxShadow: '0 2px 5px rgba(0 0 0 / 0.1)',
         borderRadius: '1rem',
         backgroundColor: 'primary.200',
-        display: 'none',
-        xsm: {
-          display: 'block',
-        },
-        sm: {
-          top: '131px',
-          right: '100px',
-          zIndex: '100',
-        },
         _after: {
           content: '""',
           position: 'absolute',
           top: '-10px',
-          right: '20%',
-          marginLeft: '-10px',
+          right: '1.5rem',
           borderWidth: '0 10px 10px 10px',
           borderStyle: 'solid',
           borderColor: 'transparent transparent #E3E3FB transparent',
@@ -171,12 +162,13 @@ export const Header = () => {
                   <>
                     <div
                       className={css({
+                        position: 'relative',
                         display: { base: 'none', xsm: 'block' },
                       })}
                     >
                       <LoginButton proConnectHint={false} />
-                    </div>
                       <LoginHint />
+                    </div>
                   </>
                 )}
               {!!user && (

src/frontend/src/styles/index.css

@@ -6,6 +6,10 @@ body,
   height: 100%;
 }
 
+:root {
+  --avatar-cap-height: 0.7;
+}
+
 html.font-lexend {
   --fonts-sans: 'Lexend Variable', ui-sans-serif, system-ui, sans-serif;
 }