refactor: update import statement for DatabaseTools

app/agents/sql_agent.py

@@ -353,7 +353,7 @@ from IPython.display import display, Image
 from langchain_google_genai import ChatGoogleGenerativeAI
 # from app.tools.database_tools import DatabaseTools
 from app.utils.database_connection import DatabaseConnection
-from app.tools.database_tools_v2 import DatabaseTools
+from app.tools.database_tools import DatabaseTools
 
 load_dotenv()
 import os