missing imports

app.py

@@ -4,6 +4,10 @@ import pandas as pd
 import altair as alt
 import chat as idf_chat
 import sqlite3
+from langchain.sql_database import SQLDatabase
+from langchain.agents.agent_toolkits import SQLDatabaseToolkit
+from langchain.agents import create_sql_agent
+from langchain import OpenAI
 
 
 def tables_from_db():
@@ -29,7 +33,7 @@ def from_db(table: str):
 
 def from_gpt(query: str):
     # Create the agent executor
-    db = SQLDatabase.from_uri("sqlite:///archive/switrs.sqlite")
+    db = SQLDatabase.from_uri("sqlite:///switrs.sqlite")
 
     llm=OpenAI(temperature=0)
     toolkit = SQLDatabaseToolkit(llm=llm,db=db)