Update models.py

models.py

@@ -24,6 +24,7 @@ class ChatRequest(BaseModel):
     category: Optional[str] = None
     chat_history: Optional[List[Dict[str, Any]]] = None
     history: Optional[List[Dict[str, Any]]] = None
+    session_state: Optional[Dict[str, Any]] = None
 
     question_text: Optional[str] = None
     options_text: Optional[List[str]] = None
@@ -91,4 +92,4 @@ class ExplainerResult:
     trap_notes: List[str] = field(default_factory=list)
     strategy_hint: Optional[str] = None
 
-    plain_english: Optional[str] = None
+    plain_english: Optional[str] = None