Update app.py

app.py

@@ -2,7 +2,7 @@ from flask import Flask, render_template, request, redirect, url_for, session
 import os
 from werkzeug.utils import secure_filename
 #from retrival import generate_data_store
-from retrival import generate_data_store,add_document_to_existing_db, delete_chunks_by_source
+from retrival import generate_data_store #,add_document_to_existing_db, delete_chunks_by_source
 from langchain_community.vectorstores import Chroma
 from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.prompts import ChatPromptTemplate