Unify db api

engine/app/main.py

@@ -20,11 +20,11 @@ except ImportError:
     logger.warning("aiortc not available - WebRTC endpoint will be disabled")
 
 from app.config import settings
+from app.backend_adapters import build_backend_adapter_from_settings
 from core.transports import SocketTransport, WebRtcTransport, BaseTransport
 from core.session import Session
 from processors.tracks import Resampled16kTrack
 from core.events import get_event_bus, reset_event_bus
-from models.ws_v1 import ev
 
 # Check interval for heartbeat/timeout (seconds)
 _HEARTBEAT_CHECK_INTERVAL_SEC = 5
@@ -54,9 +54,7 @@ async def heartbeat_and_timeout_task(
             break
         if now - last_heartbeat_at[0] >= heartbeat_interval_sec:
             try:
-                await transport.send_event({
-                    **ev("heartbeat"),
-                })
+                await session.send_heartbeat()
                 last_heartbeat_at[0] = now
             except Exception as e:
                 logger.debug(f"Session {session_id}: heartbeat send failed: {e}")
@@ -78,6 +76,7 @@ app.add_middleware(
 
 # Active sessions storage
 active_sessions: Dict[str, Session] = {}
+backend_gateway = build_backend_adapter_from_settings()
 
 # Configure logging
 logger.remove()
@@ -167,7 +166,7 @@ async def websocket_endpoint(websocket: WebSocket):
 
     # Create transport and session
     transport = SocketTransport(websocket)
-    session = Session(session_id, transport)
+    session = Session(session_id, transport, backend_gateway=backend_gateway)
     active_sessions[session_id] = session
 
     logger.info(f"WebSocket connection established: {session_id}")
@@ -246,7 +245,7 @@ async def webrtc_endpoint(websocket: WebSocket):
 
     # Create transport and session
     transport = WebRtcTransport(websocket, pc)
-    session = Session(session_id, transport)
+    session = Session(session_id, transport, backend_gateway=backend_gateway)
     active_sessions[session_id] = session
 
     logger.info(f"WebRTC connection established: {session_id}")
@@ -360,6 +359,12 @@ async def startup_event():
     logger.info(f"Server: {settings.host}:{settings.port}")
     logger.info(f"Sample rate: {settings.sample_rate} Hz")
     logger.info(f"VAD model: {settings.vad_model_path}")
+    if settings.agent_config_path:
+        logger.info(
+            f"Agent config loaded ({settings.agent_config_source}): {settings.agent_config_path}"
+        )
+    else:
+        logger.info("Agent config: none (using .env/default agent values)")
 
 
 @app.on_event("shutdown")