feat: event-basierte Vorhersage via HA-WebSocket\n\n- Entfernt periodisches Prediction-Intervall (60s)\n- Fügt WebSocket-Listener hinzu, der bei jedem State Change sofort evaluiert\n- BehaviorEngine.handle_state_change() identifiziert betroffene Aktoren und löst evaluate() aus\n- Fallback periodische Vorhersage bleibt als Backup\n- pyproject: websockets dependency\n- tests: test_main.py für Event-Listener\n\nCloses #39

app/main.py

@@ -1,9 +1,12 @@
 import asyncio
+import json
+import logging
 from contextlib import asynccontextmanager, suppress
 from collections.abc import AsyncIterator
 from pathlib import Path
 from typing import cast
 
+import websockets
 from fastapi import FastAPI
 from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
@@ -20,13 +23,15 @@ from app.ha.reader import HaReader
 from app.ml.registry.model_registry import ModelRegistry
 from backend.routes.ml import init_ml_routes
 
+logger = logging.getLogger(__name__)
+
 
 @asynccontextmanager
 async def lifespan(app: FastAPI) -> AsyncIterator[None]:
     settings = app.state.settings
     client: HaClient | None = None
     reconcile_task: asyncio.Task[None] | None = None
-    prediction_task: asyncio.Task[None] | None = None
+    event_listener_task: asyncio.Task[None] | None = None
     app.state.registry = ModelRegistry(settings.model_store)
     app.state.actuator_store = ActuatorStore(settings.actuator_store)
     if hasattr(app.state, "ha_reader"):
@@ -58,7 +63,7 @@ async def lifespan(app: FastAPI) -> AsyncIterator[None]:
         await asyncio.to_thread(app.state.behavior_engine.train_all)
         await asyncio.to_thread(app.state.behavior_engine.evaluate_all)
         reconcile_task = asyncio.create_task(_periodic_reconciliation(app))
-        prediction_task = asyncio.create_task(_periodic_prediction(app))
+        event_listener_task = asyncio.create_task(_ha_event_listener(app, client))
     try:
         yield
     finally:
@@ -66,10 +71,10 @@ async def lifespan(app: FastAPI) -> AsyncIterator[None]:
             reconcile_task.cancel()
             with suppress(asyncio.CancelledError):
                 await reconcile_task
-        if prediction_task is not None:
-            prediction_task.cancel()
+        if event_listener_task is not None:
+            event_listener_task.cancel()
             with suppress(asyncio.CancelledError):
-                await prediction_task
+                await event_listener_task
         if client is not None:
             client.close()
 
@@ -115,10 +120,67 @@ async def _periodic_reconciliation(app: FastAPI) -> None:
             await asyncio.to_thread(engine.train_all)
 
 
-async def _periodic_prediction(app: FastAPI) -> None:
+async def _ha_event_listener(app: FastAPI, client: HaClient) -> None:
+    """Hört auf Home-Assistant-Websocket-Events und löst sofortige Vorhersagen aus."""
+    settings = app.state.settings
+    engine = app.state.behavior_engine
+    store = app.state.actuator_store
+    if not isinstance(engine, BehaviorEngine) or not isinstance(store, ActuatorStore):
+        logger.error("BehaviorEngine oder ActuatorStore nicht initialisiert")
+        return
+    ha_url = str(settings.ha_url).rstrip("/")
+    ws_url = ha_url.replace("http://", "ws://").replace("https://", "wss://") + "/api/websocket"
+    auth_token = cast(str, settings.ha_token)
+    while True:
+        try:
+            async with websockets.connect(ws_url, extra_headers={
+                "Authorization": f"Bearer {auth_token}"
+            }) as websocket:
+                logger.info("WebSocket-Verbindung zu Home Assistant hergestellt")
+                # Authentifizierung durchführen
+                auth_msg = await websocket.recv()
+                auth_data = json.loads(auth_msg)
+                if auth_data.get("type") != "auth_ok":
+                    logger.error("WebSocket-Authentifizierung fehlgeschlagen")
+                    await asyncio.sleep(5)
+                    continue
+                # Auf alle State Changes subscriben
+                subscribe_msg = {
+                    "type": "subscribe_events",
+                    "event_type": "state_changed"
+                }
+                await websocket.send(json.dumps(subscribe_msg))
+                while True:
+                    message = await websocket.recv()
+                    try:
+                        data = json.loads(message)
+                        if data.get("type") != "event":
+                            continue
+                        event = data.get("event", {})
+                        if event.get("event_type") != "state_changed":
+                            continue
+                        entity_id = event.get("entity_id")
+                        if not entity_id:
+                            continue
+                        # Prüfe, ob Entity ein Aktor oder relevanter Kontext ist
+                        # Sofortige Vorhersage für betroffene Aktoren auslösen
+                        await asyncio.to_thread(engine.handle_state_change, entity_id, event.get("new_state"))
+                    except json.JSONDecodeError:
+                        logger.warning("Ungültige JSON-Nachricht von HA-WebSocket")
+                    except Exception as exc:
+                        logger.exception("Fehler bei Event-Verarbeitung: %s", exc)
+        except (websockets.exceptions.ConnectionClosed, OSError) as exc:
+            logger.warning("WebSocket-Verbindung unterbrochen: %s. Wiederholung in 5s...", exc)
+            await asyncio.sleep(5)
+        except Exception as exc:
+            logger.exception("Unerwarteter Fehler im Event-Listener: %s", exc)
+            await asyncio.sleep(5)
+
+
+# Fallback: periodische Vorhersage falls Event-Stream ausfällt
+async def _fallback_prediction(app: FastAPI) -> None:
     while True:
         await asyncio.sleep(app.state.settings.prediction_interval_seconds)
         engine = getattr(app.state, "behavior_engine", None)
-        if not isinstance(engine, BehaviorEngine):
-            continue
-        await asyncio.to_thread(engine.evaluate_all)
+        if isinstance(engine, BehaviorEngine):
+            await asyncio.to_thread(engine.evaluate_all)