RuntimeError: Caught handled exception, but response already started. #292

ExceptionGroup: unhandled errors in a TaskGroup
  File "starlette/_utils.py", line 81, in collapse_excgroups
    yield
  File "starlette/responses.py", line 274, in __call__
    async with anyio.create_task_group() as task_group:
  File "anyio/_backends/_asyncio.py", line 799, in __aexit__
    raise BaseExceptionGroup(

OperationalError: database is locked
(5 additional frame(s) were not displayed)
...
  File "starlette/responses.py", line 277, in wrap
    await func()
  File "starlette/responses.py", line 250, in stream_response
    async for chunk in self.body_iterator:
  File "github_agent_bridge/backend.py", line 524, in _session_stream_events
    events = job_session_events(db, job_id, after_id=last_id, limit=100)
  File "github_agent_bridge/dashboard_data.py", line 504, in job_session_events
    if not table_exists(con, "job_session_events"):
  File "github_agent_bridge/dashboard_data.py", line 37, in table_exists
    row = con.execute("SELECT 1 FROM sqlite_master WHERE type='table' AND name=?", (name,)).fetchone()

RuntimeError: Caught handled exception, but response already started.
(7 additional frame(s) were not displayed)
...
  File "starlette/routing.py", line 660, in __call__
    await self.middleware_stack(scope, receive, send)
  File "starlette/routing.py", line 680, in app
    await route.handle(scope, receive, send)
  File "starlette/routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "fastapi/routing.py", line 134, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "starlette/_exception_handler.py", line 56, in wrapped_app
    raise RuntimeError("Caught handled exception, but response already started.") from exc