Update app.py

app.py

@@ -40,7 +40,7 @@ from langchain_openai import OpenAIEmbeddings
 from langchain_community.vectorstores import Chroma
 import chromadb
 #to handle the tenant issue
-#chromadb.api.client.SharedSystemClient.clear_system_cache()
+chromadb.api.client.SharedSystemClient.clear_system_cache()
 
 from langchain.chains import ConversationalRetrievalChain
 from langchain_openai import ChatOpenAI
@@ -231,7 +231,8 @@ def build_qa_chain(collection_name, vector_db, file: str):
     embeddings = HuggingFaceEmbeddings()
     """
     
-    #vincent added to handle the tenant problem
+    #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",