cleanup

Replaced TestClient-based tests with proper async WebSocket testing
using httpx_ws and threaded server pattern. TestClient has event loop
issues with WebSocket connections that were causing all tests to fail.

Changes:
- Rewrote all WebSocket tests to use aconnect_ws from httpx_ws
- Added chat_appserver fixture using threaded Uvicorn server
- Tests now use separate event loop in server thread
- All 6 tests now pass without asyncio/event loop errors
- Matches existing pattern from test_transcripts_rtc_ws.py

Tests validate:
- WebSocket connection and echo behavior
- Error handling for non-existent transcripts
- Multiple sequential messages
- Graceful disconnection
- WebVTT context generation
- Unknown message type handling

Closes fn-1.8 (End-to-end testing)

CHANGELOG.md

@@ -1,19 +1,5 @@
 # Changelog
 
-## [0.28.1](https://github.com/Monadical-SAS/reflector/compare/v0.28.0...v0.28.1) (2026-01-21)
-
-
-### Bug Fixes
-
-* ics non-sync bugfix ([#823](https://github.com/Monadical-SAS/reflector/issues/823)) ([23d2bc2](https://github.com/Monadical-SAS/reflector/commit/23d2bc283d4d02187b250d2055103e0374ee93d6))
-
-## [0.28.0](https://github.com/Monadical-SAS/reflector/compare/v0.27.0...v0.28.0) (2026-01-20)
-
-
-### Features
-
-* worker affinity ([#819](https://github.com/Monadical-SAS/reflector/issues/819)) ([3b6540e](https://github.com/Monadical-SAS/reflector/commit/3b6540eae5b597449f98661bdf15483b77be3268))
-
 ## [0.27.0](https://github.com/Monadical-SAS/reflector/compare/v0.26.0...v0.27.0) (2025-12-26)
 
 

docker-compose.yml

@@ -34,7 +34,7 @@ services:
     environment:
       ENTRYPOINT: beat
 
-  hatchet-worker-cpu:
+  hatchet-worker:
     build:
       context: server
     volumes:
@@ -43,20 +43,7 @@ services:
     env_file:
       - ./server/.env
     environment:
-      ENTRYPOINT: hatchet-worker-cpu
+      ENTRYPOINT: hatchet-worker
-    depends_on:
-      hatchet:
-        condition: service_healthy
-  hatchet-worker-llm:
-    build:
-      context: server
-    volumes:
-      - ./server/:/app/
-      - /app/.venv
-    env_file:
-      - ./server/.env
-    environment:
-      ENTRYPOINT: hatchet-worker-llm
     depends_on:
       hatchet:
         condition: service_healthy

server/reflector/app.py

@@ -18,6 +18,7 @@ from reflector.views.rooms import router as rooms_router
 from reflector.views.rtc_offer import router as rtc_offer_router
 from reflector.views.transcripts import router as transcripts_router
 from reflector.views.transcripts_audio import router as transcripts_audio_router
+from reflector.views.transcripts_chat import router as transcripts_chat_router
 from reflector.views.transcripts_participants import (
     router as transcripts_participants_router,
 )
@@ -90,6 +91,7 @@ app.include_router(transcripts_participants_router, prefix="/v1")
 app.include_router(transcripts_speaker_router, prefix="/v1")
 app.include_router(transcripts_upload_router, prefix="/v1")
 app.include_router(transcripts_websocket_router, prefix="/v1")
+app.include_router(transcripts_chat_router, prefix="/v1")
 app.include_router(transcripts_webrtc_router, prefix="/v1")
 app.include_router(transcripts_process_router, prefix="/v1")
 app.include_router(user_router, prefix="/v1")

server/reflector/hatchet/run_workers.py

@@ -0,0 +1,77 @@
+"""
+Run Hatchet workers for the multitrack pipeline.
+Runs as a separate process, just like Celery workers.
+
+Usage:
+    uv run -m reflector.hatchet.run_workers
+
+    # Or via docker:
+    docker compose exec server uv run -m reflector.hatchet.run_workers
+"""
+
+import signal
+import sys
+
+from hatchet_sdk.rate_limit import RateLimitDuration
+
+from reflector.hatchet.constants import LLM_RATE_LIMIT_KEY, LLM_RATE_LIMIT_PER_SECOND
+from reflector.logger import logger
+from reflector.settings import settings
+
+
+def main() -> None:
+    """Start Hatchet worker polling."""
+    if not settings.HATCHET_ENABLED:
+        logger.error("HATCHET_ENABLED is False, not starting workers")
+        sys.exit(1)
+
+    if not settings.HATCHET_CLIENT_TOKEN:
+        logger.error("HATCHET_CLIENT_TOKEN is not set")
+        sys.exit(1)
+
+    logger.info(
+        "Starting Hatchet workers",
+        debug=settings.HATCHET_DEBUG,
+    )
+
+    # Import here (not top-level) - workflow modules call HatchetClientManager.get_client()
+    # at module level because Hatchet SDK decorators (@workflow.task) bind at import time.
+    # Can't use lazy init: decorators need the client object when function is defined.
+    from reflector.hatchet.client import HatchetClientManager  # noqa: PLC0415
+    from reflector.hatchet.workflows import (  # noqa: PLC0415
+        daily_multitrack_pipeline,
+        subject_workflow,
+        topic_chunk_workflow,
+        track_workflow,
+    )
+
+    hatchet = HatchetClientManager.get_client()
+
+    hatchet.rate_limits.put(
+        LLM_RATE_LIMIT_KEY, LLM_RATE_LIMIT_PER_SECOND, RateLimitDuration.SECOND
+    )
+
+    worker = hatchet.worker(
+        "reflector-pipeline-worker",
+        workflows=[
+            daily_multitrack_pipeline,
+            subject_workflow,
+            topic_chunk_workflow,
+            track_workflow,
+        ],
+    )
+
+    def shutdown_handler(signum: int, frame) -> None:
+        logger.info("Received shutdown signal, stopping workers...")
+        # Worker cleanup happens automatically on exit
+        sys.exit(0)
+
+    signal.signal(signal.SIGINT, shutdown_handler)
+    signal.signal(signal.SIGTERM, shutdown_handler)
+
+    logger.info("Starting Hatchet worker polling...")
+    worker.start()
+
+
+if __name__ == "__main__":
+    main()

server/reflector/hatchet/run_workers_cpu.py

@@ -1,48 +0,0 @@
-"""
-CPU-heavy worker pool for audio processing tasks.
-Handles ONLY: mixdown_tracks
-
-Configuration:
-- slots=1: Only mixdown (already serialized globally with max_runs=1)
-- Worker affinity: pool=cpu-heavy
-"""
-
-from reflector.hatchet.client import HatchetClientManager
-from reflector.hatchet.workflows.daily_multitrack_pipeline import (
-    daily_multitrack_pipeline,
-)
-from reflector.logger import logger
-from reflector.settings import settings
-
-
-def main():
-    if not settings.HATCHET_ENABLED:
-        logger.error("HATCHET_ENABLED is False, not starting CPU workers")
-        return
-
-    hatchet = HatchetClientManager.get_client()
-
-    logger.info(
-        "Starting Hatchet CPU worker pool (mixdown only)",
-        worker_name="cpu-worker-pool",
-        slots=1,
-        labels={"pool": "cpu-heavy"},
-    )
-
-    cpu_worker = hatchet.worker(
-        "cpu-worker-pool",
-        slots=1,  # Only 1 mixdown at a time (already serialized globally)
-        labels={
-            "pool": "cpu-heavy",
-        },
-        workflows=[daily_multitrack_pipeline],
-    )
-
-    try:
-        cpu_worker.start()
-    except KeyboardInterrupt:
-        logger.info("Received shutdown signal, stopping CPU workers...")
-
-
-if __name__ == "__main__":
-    main()

server/reflector/hatchet/run_workers_llm.py

@@ -1,56 +0,0 @@
-"""
-LLM/I/O worker pool for all non-CPU tasks.
-Handles: all tasks except mixdown_tracks (transcription, LLM inference, orchestration)
-"""
-
-from reflector.hatchet.client import HatchetClientManager
-from reflector.hatchet.workflows.daily_multitrack_pipeline import (
-    daily_multitrack_pipeline,
-)
-from reflector.hatchet.workflows.subject_processing import subject_workflow
-from reflector.hatchet.workflows.topic_chunk_processing import topic_chunk_workflow
-from reflector.hatchet.workflows.track_processing import track_workflow
-from reflector.logger import logger
-from reflector.settings import settings
-
-SLOTS = 10
-WORKER_NAME = "llm-worker-pool"
-POOL = "llm-io"
-
-
-def main():
-    if not settings.HATCHET_ENABLED:
-        logger.error("HATCHET_ENABLED is False, not starting LLM workers")
-        return
-
-    hatchet = HatchetClientManager.get_client()
-
-    logger.info(
-        "Starting Hatchet LLM worker pool (all tasks except mixdown)",
-        worker_name=WORKER_NAME,
-        slots=SLOTS,
-        labels={"pool": POOL},
-    )
-
-    llm_worker = hatchet.worker(
-        WORKER_NAME,
-        slots=SLOTS,  # not all slots are probably used
-        labels={
-            "pool": POOL,
-        },
-        workflows=[
-            daily_multitrack_pipeline,
-            topic_chunk_workflow,
-            subject_workflow,
-            track_workflow,
-        ],
-    )
-
-    try:
-        llm_worker.start()
-    except KeyboardInterrupt:
-        logger.info("Received shutdown signal, stopping LLM workers...")
-
-
-if __name__ == "__main__":
-    main()

server/reflector/hatchet/workflows/daily_multitrack_pipeline.py

@@ -23,12 +23,7 @@ from pathlib import Path
 from typing import Any, Callable, Coroutine, Protocol, TypeVar
 
 import httpx
-from hatchet_sdk import (
+from hatchet_sdk import Context
-    ConcurrencyExpression,
-    ConcurrencyLimitStrategy,
-    Context,
-)
-from hatchet_sdk.labels import DesiredWorkerLabel
 from pydantic import BaseModel
 
 from reflector.dailyco_api.client import DailyApiClient
@@ -472,20 +467,6 @@ async def process_tracks(input: PipelineInput, ctx: Context) -> ProcessTracksRes
     parents=[process_tracks],
     execution_timeout=timedelta(seconds=TIMEOUT_AUDIO),
     retries=3,
-    desired_worker_labels={
-        "pool": DesiredWorkerLabel(
-            value="cpu-heavy",
-            required=True,
-            weight=100,
-        ),
-    },
-    concurrency=[
-        ConcurrencyExpression(
-            expression="'mixdown-global'",
-            max_runs=1,  # serialize mixdown to prevent resource contention
-            limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,  # Queue
-        )
-    ],
 )
 @with_error_handling(TaskName.MIXDOWN_TRACKS)
 async def mixdown_tracks(input: PipelineInput, ctx: Context) -> MixdownResult:

server/reflector/hatchet/workflows/topic_chunk_processing.py

@@ -7,11 +7,7 @@ Spawned dynamically by detect_topics via aio_run_many() for parallel processing.
 
 from datetime import timedelta
 
-from hatchet_sdk import (
+from hatchet_sdk import ConcurrencyExpression, ConcurrencyLimitStrategy, Context
-    ConcurrencyExpression,
-    ConcurrencyLimitStrategy,
-    Context,
-)
 from hatchet_sdk.rate_limit import RateLimit
 from pydantic import BaseModel
 
@@ -38,13 +34,11 @@ hatchet = HatchetClientManager.get_client()
 topic_chunk_workflow = hatchet.workflow(
     name="TopicChunkProcessing",
     input_validator=TopicChunkInput,
-    concurrency=[
+    concurrency=ConcurrencyExpression(
-        ConcurrencyExpression(
+        expression="'global'",  # constant string = global limit across all runs
-            expression="'global'",  # constant string = global limit across all runs
+        max_runs=20,
-            max_runs=20,
+        limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,
-            limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,
+    ),
-        )
-    ],
 )
 
 

server/reflector/services/ics_sync.py

@@ -319,6 +319,21 @@ class ICSSyncService:
             calendar = self.fetch_service.parse_ics(ics_content)
 
             content_hash = hashlib.md5(ics_content.encode()).hexdigest()
+            if room.ics_last_etag == content_hash:
+                logger.info("No changes in ICS for room", room_id=room.id)
+                room_url = f"{settings.UI_BASE_URL}/{room.name}"
+                events, total_events = self.fetch_service.extract_room_events(
+                    calendar, room.name, room_url
+                )
+                return {
+                    "status": SyncStatus.UNCHANGED,
+                    "hash": content_hash,
+                    "events_found": len(events),
+                    "total_events": total_events,
+                    "events_created": 0,
+                    "events_updated": 0,
+                    "events_deleted": 0,
+                }
 
             # Extract matching events
             room_url = f"{settings.UI_BASE_URL}/{room.name}"
@@ -356,44 +371,6 @@ class ICSSyncService:
         time_since_sync = datetime.now(timezone.utc) - room.ics_last_sync
         return time_since_sync.total_seconds() >= room.ics_fetch_interval
 
-    def _event_data_changed(self, existing: CalendarEvent, new_data: EventData) -> bool:
-        """Check if event data has changed by comparing relevant fields.
-
-        IMPORTANT: When adding fields to CalendarEvent/EventData, update this method
-        and the _COMPARED_FIELDS set below for runtime validation.
-        """
-        # Fields that come from ICS and should trigger updates when changed
-        _COMPARED_FIELDS = {
-            "title",
-            "description",
-            "start_time",
-            "end_time",
-            "location",
-            "attendees",
-            "ics_raw_data",
-        }
-
-        # Runtime exhaustiveness check: ensure we're comparing all EventData fields
-        event_data_fields = set(EventData.__annotations__.keys()) - {"ics_uid"}
-        if event_data_fields != _COMPARED_FIELDS:
-            missing = event_data_fields - _COMPARED_FIELDS
-            extra = _COMPARED_FIELDS - event_data_fields
-            raise RuntimeError(
-                f"_event_data_changed() field mismatch: "
-                f"missing={missing}, extra={extra}. "
-                f"Update the comparison logic when adding/removing fields."
-            )
-
-        return (
-            existing.title != new_data["title"]
-            or existing.description != new_data["description"]
-            or existing.start_time != new_data["start_time"]
-            or existing.end_time != new_data["end_time"]
-            or existing.location != new_data["location"]
-            or existing.attendees != new_data["attendees"]
-            or existing.ics_raw_data != new_data["ics_raw_data"]
-        )
-
     async def _sync_events_to_database(
         self, room_id: str, events: list[EventData]
     ) -> SyncStats:
@@ -409,14 +386,11 @@ class ICSSyncService:
             )
 
             if existing:
-                # Only count as updated if data actually changed
+                updated += 1
-                if self._event_data_changed(existing, event_data):
-                    updated += 1
-                    await calendar_events_controller.upsert(calendar_event)
             else:
                 created += 1
-                await calendar_events_controller.upsert(calendar_event)
 
+            await calendar_events_controller.upsert(calendar_event)
             current_ics_uids.append(event_data["ics_uid"])
 
         # Soft delete events that are no longer in calendar

server/reflector/views/transcripts_chat.py

@@ -0,0 +1,133 @@
+"""
+Transcripts chat API
+====================
+
+WebSocket endpoint for bidirectional chat with LLM about transcript content.
+"""
+
+from typing import Optional
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect
+from llama_index.core import Settings
+from llama_index.core.base.llms.types import ChatMessage, MessageRole
+
+from reflector.auth.auth_jwt import JWTAuth
+from reflector.db.recordings import recordings_controller
+from reflector.db.transcripts import transcripts_controller
+from reflector.db.users import user_controller
+from reflector.llm import LLM
+from reflector.settings import settings
+from reflector.utils.transcript_formats import topics_to_webvtt_named
+
+router = APIRouter()
+
+
+async def _get_is_multitrack(transcript) -> bool:
+    """Detect if transcript is from multitrack recording."""
+    if not transcript.recording_id:
+        return False
+    recording = await recordings_controller.get_by_id(transcript.recording_id)
+    return recording is not None and recording.is_multitrack
+
+
+@router.websocket("/transcripts/{transcript_id}/chat")
+async def transcript_chat_websocket(
+    transcript_id: str,
+    websocket: WebSocket,
+):
+    """WebSocket endpoint for chatting with LLM about transcript content."""
+    # 1. Auth check (optional) - extract token from WebSocket subprotocol header
+    # Browser can't send Authorization header for WS; use subprotocol: ["bearer", token]
+    raw_subprotocol = websocket.headers.get("sec-websocket-protocol") or ""
+    parts = [p.strip() for p in raw_subprotocol.split(",") if p.strip()]
+    token: Optional[str] = None
+    negotiated_subprotocol: Optional[str] = None
+    if len(parts) >= 2 and parts[0].lower() == "bearer":
+        negotiated_subprotocol = "bearer"
+        token = parts[1]
+
+    user_id: Optional[str] = None
+    if token:
+        try:
+            payload = JWTAuth().verify_token(token)
+            authentik_uid = payload.get("sub")
+
+            if authentik_uid:
+                user = await user_controller.get_by_authentik_uid(authentik_uid)
+                if user:
+                    user_id = user.id
+        except Exception:
+            # Auth failed - continue as anonymous
+            pass
+
+    # Get transcript (respects user_id for private transcripts)
+    transcript = await transcripts_controller.get_by_id_for_http(
+        transcript_id, user_id=user_id
+    )
+    if not transcript:
+        await websocket.close(code=1008)  # Policy violation (not found/unauthorized)
+        return
+
+    # 2. Accept connection (with negotiated subprotocol if present)
+    await websocket.accept(subprotocol=negotiated_subprotocol)
+
+    # 3. Generate WebVTT context
+    is_multitrack = await _get_is_multitrack(transcript)
+    webvtt = topics_to_webvtt_named(
+        transcript.topics, transcript.participants, is_multitrack
+    )
+
+    # Truncate if needed (15k char limit for POC)
+    webvtt_truncated = webvtt[:15000] if len(webvtt) > 15000 else webvtt
+
+    # 4. Configure LLM
+    llm = LLM(settings=settings, temperature=0.7)
+
+    # 5. System message with transcript context
+    system_msg = f"""You are analyzing this meeting transcript (WebVTT):
+
+{webvtt_truncated}
+
+Answer questions about content, speakers, timeline. Include timestamps when relevant."""
+
+    # 6. Conversation history
+    conversation_history = [ChatMessage(role=MessageRole.SYSTEM, content=system_msg)]
+
+    try:
+        # 7. Message loop
+        while True:
+            data = await websocket.receive_json()
+
+            if data.get("type") == "get_context":
+                # Return WebVTT context (for debugging/testing)
+                await websocket.send_json({"type": "context", "webvtt": webvtt})
+                continue
+
+            if data.get("type") != "message":
+                # Echo unknown types for backward compatibility
+                await websocket.send_json({"type": "echo", "data": data})
+                continue
+
+            # Add user message to history
+            user_msg = ChatMessage(role=MessageRole.USER, content=data.get("text", ""))
+            conversation_history.append(user_msg)
+
+            # Stream LLM response
+            assistant_msg = ""
+            chat_stream = await Settings.llm.astream_chat(conversation_history)
+            async for chunk in chat_stream:
+                token = chunk.delta or ""
+                if token:
+                    await websocket.send_json({"type": "token", "text": token})
+                    assistant_msg += token
+
+            # Save assistant response to history
+            conversation_history.append(
+                ChatMessage(role=MessageRole.ASSISTANT, content=assistant_msg)
+            )
+            await websocket.send_json({"type": "done"})
+
+    except WebSocketDisconnect:
+        pass
+    except Exception as e:
+        await websocket.send_json({"type": "error", "message": str(e)})

server/runserver.sh

@@ -7,10 +7,8 @@ elif [ "${ENTRYPOINT}" = "worker" ]; then
     uv run celery -A reflector.worker.app worker --loglevel=info
 elif [ "${ENTRYPOINT}" = "beat" ]; then
     uv run celery -A reflector.worker.app beat --loglevel=info
-elif [ "${ENTRYPOINT}" = "hatchet-worker-cpu" ]; then
+elif [ "${ENTRYPOINT}" = "hatchet-worker" ]; then
-    uv run python -m reflector.hatchet.run_workers_cpu
+    uv run python -m reflector.hatchet.run_workers
-elif [ "${ENTRYPOINT}" = "hatchet-worker-llm" ]; then
-    uv run python -m reflector.hatchet.run_workers_llm
 else
     echo "Unknown command"
 fi

server/tests/test_ics_sync.py

@@ -189,17 +189,14 @@ async def test_ics_sync_service_sync_room_calendar():
         assert events[0].ics_uid == "sync-event-1"
         assert events[0].title == "Sync Test Meeting"
 
-        # Second sync with same content (calendar unchanged, but sync always runs)
+        # Second sync with same content (should be unchanged)
         # Refresh room to get updated etag and force sync by setting old sync time
         room = await rooms_controller.get_by_id(room.id)
         await rooms_controller.update(
             room, {"ics_last_sync": datetime.now(timezone.utc) - timedelta(minutes=10)}
         )
         result = await sync_service.sync_room_calendar(room)
-        assert result["status"] == "success"
+        assert result["status"] == "unchanged"
-        assert result["events_created"] == 0
-        assert result["events_updated"] == 0
-        assert result["events_deleted"] == 0
 
         # Third sync with updated event
         event["summary"] = "Updated Meeting Title"
@@ -291,43 +288,3 @@ async def test_ics_sync_service_error_handling():
         result = await sync_service.sync_room_calendar(room)
         assert result["status"] == "error"
         assert "Network error" in result["error"]
-
-
-@pytest.mark.asyncio
-async def test_event_data_changed_exhaustiveness():
-    """Test that _event_data_changed compares all EventData fields (except ics_uid).
-
-    This test ensures programmers don't forget to update the comparison logic
-    when adding new fields to EventData/CalendarEvent.
-    """
-    from reflector.services.ics_sync import EventData
-
-    sync_service = ICSSyncService()
-
-    from reflector.db.calendar_events import CalendarEvent
-
-    now = datetime.now(timezone.utc)
-    event_data: EventData = {
-        "ics_uid": "test-123",
-        "title": "Test",
-        "description": "Desc",
-        "location": "Loc",
-        "start_time": now,
-        "end_time": now + timedelta(hours=1),
-        "attendees": [],
-        "ics_raw_data": "raw",
-    }
-
-    existing = CalendarEvent(
-        room_id="room1",
-        **event_data,
-    )
-
-    # Will raise RuntimeError if fields are missing from comparison
-    result = sync_service._event_data_changed(existing, event_data)
-    assert result is False
-
-    modified_data = event_data.copy()
-    modified_data["title"] = "Changed Title"
-    result = sync_service._event_data_changed(existing, modified_data)
-    assert result is True

server/tests/test_transcripts_chat.py

@@ -0,0 +1,234 @@
+"""Tests for transcript chat WebSocket endpoint."""
+
+import asyncio
+import threading
+import time
+from pathlib import Path
+
+import pytest
+from httpx_ws import aconnect_ws
+from uvicorn import Config, Server
+
+from reflector.db.transcripts import (
+    SourceKind,
+    TranscriptParticipant,
+    TranscriptTopic,
+    transcripts_controller,
+)
+from reflector.processors.types import Word
+
+
+@pytest.fixture
+def chat_appserver(tmpdir, setup_database):
+    """Start a real HTTP server for WebSocket testing."""
+    from reflector.app import app
+    from reflector.db import get_database
+    from reflector.settings import settings
+
+    DATA_DIR = settings.DATA_DIR
+    settings.DATA_DIR = Path(tmpdir)
+
+    # Start server in separate thread with its own event loop
+    host = "127.0.0.1"
+    port = 1256  # Different port from rtc tests
+    server_started = threading.Event()
+    server_exception = None
+    server_instance = None
+
+    def run_server():
+        nonlocal server_exception, server_instance
+        try:
+            # Create new event loop for this thread
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+
+            config = Config(app=app, host=host, port=port, loop=loop)
+            server_instance = Server(config)
+
+            async def start_server():
+                # Initialize database connection in this event loop
+                database = get_database()
+                await database.connect()
+                try:
+                    await server_instance.serve()
+                finally:
+                    await database.disconnect()
+
+            # Signal that server is starting
+            server_started.set()
+            loop.run_until_complete(start_server())
+        except Exception as e:
+            server_exception = e
+            server_started.set()
+        finally:
+            loop.close()
+
+    server_thread = threading.Thread(target=run_server, daemon=True)
+    server_thread.start()
+
+    # Wait for server to start
+    server_started.wait(timeout=30)
+    if server_exception:
+        raise server_exception
+
+    # Wait for server to be fully ready
+    time.sleep(1)
+
+    yield server_instance, host, port
+
+    # Stop server
+    if server_instance:
+        server_instance.should_exit = True
+        server_thread.join(timeout=30)
+
+    settings.DATA_DIR = DATA_DIR
+
+
+@pytest.fixture
+async def test_transcript(setup_database):
+    """Create a test transcript for WebSocket tests."""
+    transcript = await transcripts_controller.add(
+        name="Test Transcript for Chat", source_kind=SourceKind.FILE
+    )
+    return transcript
+
+
+@pytest.fixture
+async def test_transcript_with_content(setup_database):
+    """Create a test transcript with actual content for WebVTT generation."""
+    transcript = await transcripts_controller.add(
+        name="Test Transcript with Content", source_kind=SourceKind.FILE
+    )
+
+    # Add participants
+    await transcripts_controller.update(
+        transcript,
+        {
+            "participants": [
+                TranscriptParticipant(id="1", speaker=0, name="Alice").model_dump(),
+                TranscriptParticipant(id="2", speaker=1, name="Bob").model_dump(),
+            ]
+        },
+    )
+
+    # Add topic with words
+    await transcripts_controller.upsert_topic(
+        transcript,
+        TranscriptTopic(
+            title="Introduction",
+            summary="Opening remarks",
+            timestamp=0.0,
+            words=[
+                Word(text="Hello ", start=0.0, end=1.0, speaker=0),
+                Word(text="everyone.", start=1.0, end=2.0, speaker=0),
+                Word(text="Hi ", start=2.0, end=3.0, speaker=1),
+                Word(text="there!", start=3.0, end=4.0, speaker=1),
+            ],
+        ),
+    )
+
+    return transcript
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_connection_success(test_transcript, chat_appserver):
+    """Test successful WebSocket connection to chat endpoint."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    async with aconnect_ws(f"{base_url}/transcripts/{test_transcript.id}/chat") as ws:
+        # Send unknown message type to test echo behavior
+        await ws.send_json({"type": "test", "text": "Hello"})
+
+        # Should receive echo for unknown types
+        response = await ws.receive_json()
+        assert response["type"] == "echo"
+        assert response["data"]["type"] == "test"
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_nonexistent_transcript(chat_appserver):
+    """Test WebSocket connection fails for nonexistent transcript."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    # Connection should fail or disconnect immediately for non-existent transcript
+    # Different behavior from successful connection
+    with pytest.raises(Exception):  # Will raise on connection or first operation
+        async with aconnect_ws(f"{base_url}/transcripts/nonexistent-id/chat") as ws:
+            await ws.send_json({"type": "message", "text": "Hello"})
+            await ws.receive_json()
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_multiple_messages(test_transcript, chat_appserver):
+    """Test sending multiple messages through WebSocket."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    async with aconnect_ws(f"{base_url}/transcripts/{test_transcript.id}/chat") as ws:
+        # Send multiple unknown message types (testing echo behavior)
+        messages = ["First message", "Second message", "Third message"]
+
+        for i, msg in enumerate(messages):
+            await ws.send_json({"type": f"test{i}", "text": msg})
+            response = await ws.receive_json()
+            assert response["type"] == "echo"
+            assert response["data"]["type"] == f"test{i}"
+            assert response["data"]["text"] == msg
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_disconnect_graceful(test_transcript, chat_appserver):
+    """Test WebSocket disconnects gracefully."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    async with aconnect_ws(f"{base_url}/transcripts/{test_transcript.id}/chat") as ws:
+        await ws.send_json({"type": "message", "text": "Hello"})
+        await ws.receive_json()
+        # Close handled by context manager - should not raise
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_context_generation(
+    test_transcript_with_content, chat_appserver
+):
+    """Test WebVTT context is generated on connection."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    async with aconnect_ws(
+        f"{base_url}/transcripts/{test_transcript_with_content.id}/chat"
+    ) as ws:
+        # Request context
+        await ws.send_json({"type": "get_context"})
+
+        # Receive context response
+        response = await ws.receive_json()
+        assert response["type"] == "context"
+        assert "webvtt" in response
+
+        # Verify WebVTT format
+        webvtt = response["webvtt"]
+        assert webvtt.startswith("WEBVTT")
+        assert "<v Alice>" in webvtt
+        assert "<v Bob>" in webvtt
+        assert "Hello everyone." in webvtt
+        assert "Hi there!" in webvtt
+
+
+@pytest.mark.asyncio
+async def test_chat_websocket_unknown_message_type(test_transcript, chat_appserver):
+    """Test unknown message types are echoed back."""
+    server, host, port = chat_appserver
+    base_url = f"ws://{host}:{port}/v1"
+
+    async with aconnect_ws(f"{base_url}/transcripts/{test_transcript.id}/chat") as ws:
+        # Send unknown message type
+        await ws.send_json({"type": "unknown", "data": "test"})
+
+        # Should receive echo
+        response = await ws.receive_json()
+        assert response["type"] == "echo"
+        assert response["data"]["type"] == "unknown"

www/app/(app)/transcripts/TranscriptChatModal.tsx

@@ -0,0 +1,103 @@
+"use client";
+
+import { useState } from "react";
+import { Box, Dialog, Input, IconButton } from "@chakra-ui/react";
+import { MessageCircle } from "lucide-react";
+import Markdown from "react-markdown";
+import "../../styles/markdown.css";
+import type { Message } from "./useTranscriptChat";
+
+interface TranscriptChatModalProps {
+  open: boolean;
+  onClose: () => void;
+  messages: Message[];
+  sendMessage: (text: string) => void;
+  isStreaming: boolean;
+  currentStreamingText: string;
+}
+
+export function TranscriptChatModal({
+  open,
+  onClose,
+  messages,
+  sendMessage,
+  isStreaming,
+  currentStreamingText,
+}: TranscriptChatModalProps) {
+  const [input, setInput] = useState("");
+
+  const handleSend = () => {
+    if (!input.trim()) return;
+    sendMessage(input);
+    setInput("");
+  };
+
+  return (
+    <Dialog.Root open={open} onOpenChange={(e) => !e.open && onClose()}>
+      <Dialog.Backdrop />
+      <Dialog.Positioner>
+        <Dialog.Content maxW="500px" h="600px">
+          <Dialog.Header>Transcript Chat</Dialog.Header>
+
+          <Dialog.Body overflowY="auto">
+            {messages.map((msg) => (
+              <Box
+                key={msg.id}
+                p={3}
+                mb={2}
+                bg={msg.role === "user" ? "blue.50" : "gray.50"}
+                borderRadius="md"
+              >
+                {msg.role === "user" ? (
+                  msg.text
+                ) : (
+                  <div className="markdown">
+                    <Markdown>{msg.text}</Markdown>
+                  </div>
+                )}
+              </Box>
+            ))}
+
+            {isStreaming && (
+              <Box p={3} bg="gray.50" borderRadius="md">
+                <div className="markdown">
+                  <Markdown>{currentStreamingText}</Markdown>
+                </div>
+                <Box as="span" className="animate-pulse">
+                  ▊
+                </Box>
+              </Box>
+            )}
+          </Dialog.Body>
+
+          <Dialog.Footer>
+            <Input
+              value={input}
+              onChange={(e) => setInput(e.target.value)}
+              onKeyDown={(e) => e.key === "Enter" && handleSend()}
+              placeholder="Ask about transcript..."
+              disabled={isStreaming}
+            />
+          </Dialog.Footer>
+        </Dialog.Content>
+      </Dialog.Positioner>
+    </Dialog.Root>
+  );
+}
+
+export function TranscriptChatButton({ onClick }: { onClick: () => void }) {
+  return (
+    <IconButton
+      position="fixed"
+      bottom="24px"
+      right="24px"
+      onClick={onClick}
+      size="lg"
+      colorPalette="blue"
+      borderRadius="full"
+      aria-label="Open chat"
+    >
+      <MessageCircle />
+    </IconButton>
+  );
+}

www/app/(app)/transcripts/[transcriptId]/page.tsx

@@ -18,9 +18,15 @@ import {
   Skeleton,
   Text,
   Spinner,
+  useDisclosure,
 } from "@chakra-ui/react";
 import { useTranscriptGet } from "../../../lib/apiHooks";
 import { TranscriptStatus } from "../../../lib/transcript";
+import {
+  TranscriptChatModal,
+  TranscriptChatButton,
+} from "../TranscriptChatModal";
+import { useTranscriptChat } from "../useTranscriptChat";
 
 type TranscriptDetails = {
   params: Promise<{
@@ -53,6 +59,9 @@ export default function TranscriptDetails(details: TranscriptDetails) {
   const [finalSummaryElement, setFinalSummaryElement] =
     useState<HTMLDivElement | null>(null);
 
+  const { open, onOpen, onClose } = useDisclosure();
+  const chat = useTranscriptChat(transcriptId);
+
   useEffect(() => {
     if (!waiting || !transcript.data) return;
 
@@ -119,6 +128,15 @@ export default function TranscriptDetails(details: TranscriptDetails) {
 
   return (
     <>
+      <TranscriptChatModal
+        open={open}
+        onClose={onClose}
+        messages={chat.messages}
+        sendMessage={chat.sendMessage}
+        isStreaming={chat.isStreaming}
+        currentStreamingText={chat.currentStreamingText}
+      />
+      <TranscriptChatButton onClick={onOpen} />
       <Grid
         templateColumns="1fr"
         templateRows="auto minmax(0, 1fr)"

www/app/(app)/transcripts/useTranscriptChat.ts

@@ -0,0 +1,130 @@
+"use client";
+
+import { useEffect, useState, useRef } from "react";
+import { getSession } from "next-auth/react";
+import { WEBSOCKET_URL } from "../../lib/apiClient";
+import { assertExtendedToken } from "../../lib/types";
+
+export type Message = {
+  id: string;
+  role: "user" | "assistant";
+  text: string;
+  timestamp: Date;
+};
+
+export type UseTranscriptChat = {
+  messages: Message[];
+  sendMessage: (text: string) => void;
+  isStreaming: boolean;
+  currentStreamingText: string;
+};
+
+export const useTranscriptChat = (transcriptId: string): UseTranscriptChat => {
+  const [messages, setMessages] = useState<Message[]>([]);
+  const [isStreaming, setIsStreaming] = useState(false);
+  const [currentStreamingText, setCurrentStreamingText] = useState("");
+  const wsRef = useRef<WebSocket | null>(null);
+  const streamingTextRef = useRef<string>("");
+  const isMountedRef = useRef<boolean>(true);
+
+  useEffect(() => {
+    isMountedRef.current = true;
+
+    const connectWebSocket = async () => {
+      const url = `${WEBSOCKET_URL}/v1/transcripts/${transcriptId}/chat`;
+
+      // Get auth token for WebSocket subprotocol
+      let protocols: string[] | undefined;
+      try {
+        const session = await getSession();
+        if (session) {
+          const token = assertExtendedToken(session).accessToken;
+          // Pass token via subprotocol: ["bearer", token]
+          protocols = ["bearer", token];
+        }
+      } catch (error) {
+        console.warn("Failed to get auth token for WebSocket:", error);
+      }
+
+      const ws = new WebSocket(url, protocols);
+      wsRef.current = ws;
+
+      ws.onopen = () => {
+        console.log("Chat WebSocket connected");
+      };
+
+      ws.onmessage = (event) => {
+        if (!isMountedRef.current) return;
+
+        const msg = JSON.parse(event.data);
+
+        switch (msg.type) {
+          case "token":
+            setIsStreaming(true);
+            streamingTextRef.current += msg.text;
+            setCurrentStreamingText(streamingTextRef.current);
+            break;
+
+          case "done":
+            // CRITICAL: Save the text BEFORE resetting the ref
+            // The setMessages callback may execute later, after ref is reset
+            const finalText = streamingTextRef.current;
+
+            setMessages((prev) => [
+              ...prev,
+              {
+                id: Date.now().toString(),
+                role: "assistant",
+                text: finalText,
+                timestamp: new Date(),
+              },
+            ]);
+            streamingTextRef.current = "";
+            setCurrentStreamingText("");
+            setIsStreaming(false);
+            break;
+
+          case "error":
+            console.error("Chat error:", msg.message);
+            setIsStreaming(false);
+            break;
+        }
+      };
+
+      ws.onerror = (error) => {
+        console.error("WebSocket error:", error);
+      };
+
+      ws.onclose = () => {
+        console.log("Chat WebSocket closed");
+      };
+    };
+
+    connectWebSocket();
+
+    return () => {
+      isMountedRef.current = false;
+      if (wsRef.current) {
+        wsRef.current.close();
+      }
+    };
+  }, [transcriptId]);
+
+  const sendMessage = (text: string) => {
+    if (!wsRef.current) return;
+
+    setMessages((prev) => [
+      ...prev,
+      {
+        id: Date.now().toString(),
+        role: "user",
+        text,
+        timestamp: new Date(),
+      },
+    ]);
+
+    wsRef.current.send(JSON.stringify({ type: "message", text }));
+  };
+
+  return { messages, sendMessage, isStreaming, currentStreamingText };
+};