Update app.py

app.py

@@ -231,8 +231,8 @@ def build_qa_chain(collection_name, vector_db, file: str):
     embeddings = HuggingFaceEmbeddings()
     """
     
-    #vincent added to handle the tenant problem 
-    #chromadb.api.client.SharedSystemClient.clear_system_cache()
+    #vincent added to handle the tenant problem 20250211
+    chromadb.api.client.SharedSystemClient.clear_system_cache()
     new_client = chromadb.EphemeralClient()
     memory = ConversationBufferMemory(
         memory_key="chat_history",