Obviously celery and onion. But not carrot.
And also, would you not put wine in a spag bol? I would. Onion and garlic in pot, brown off the mince add tomotaoes and wine then put it in the oven. Off to work – come back four (or eight) hours later and its ready. Make a huge pot and freeze some.
My mates special spag bol "recipe" contains a whole bottled of tomato ketchup but I'm guessing its not traditional.