Register code question

[qICEp]

Hey guys i have a game server (GTA SA-MP) using MySql and i want to connect it with SMF
I want that my users/players register on forum and than they can login in game (GTA SA-MP)

Now the thing is that i need to save their game data.
Where i can hook on register and insert some data in another table right after the SMF does it?

Im just looking for file and function where smf executes query where its inserting new user.So when smf runs its query i will add another one right after it.

Thx for help