BEHAVIOR-003: learn causal shadow triggers

app/ha/models.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from datetime import datetime
+
 from pydantic import BaseModel
 
 
@@ -15,6 +17,7 @@ class HaEntitySummary(BaseModel):
     entity_id: str
     domain: str
     state: str | None = None
+    last_changed: datetime | None = None
     state_class: str | None = None
     device_class: str | None = None
     unit_of_measurement: str | None = None