updated the embedding model

app.py

@@ -38,7 +38,7 @@ limit = 3750
 llm = ChatOpenAI(temperature=0, model_name="gpt-4" )
 
 embeddings = OpenAIEmbeddings(
-    model="text-embedding-ada-002"
+    model="text-embedding-3-large"
 )
 
 #get the db index