Update app.py

app.py

@@ -150,7 +150,8 @@ else:
     )
 
     tokenizer.use_default_system_prompt = False
-    client = chromadb.Client(
+    client = chromadb.PersistentClient(
+        path="./chroma.db",
         settings=Settings(anonymized_telemetry=False)
     )