Update app.py

app.py

@@ -93,7 +93,7 @@ async def chat(request: ChatRequest):
                         system_instruction=["You are a helpful assistant who is an expert at summarization."]
                     ),
                 )
-                request.chat_history = request.chat_history[-(summary_thresh+1):] # keep last k items
+                request.chat_history = request.chat_history[-(summary_thresh+2):] # keep last k items
                 request.chat_history.insert(1, 
                     {"role": "user", 
                      "parts": [{"text": f"Here is a summary of this conversation so far: {summary_response.text}"}]})