Update app.py

app.py

@@ -190,7 +190,7 @@ def create_vector_db(final_items):
     
     # Add the new documents to the vector database, if there are any
     if documents_to_add:
-        db.add(
+        db.upsert(
             documents=documents_to_add,
             ids=ids_to_add
         )