Function register_with 

pub fn register_with(
    lua: &Lua,
    conn: Arc<Mutex<Connection>>,
    interrupt: Arc<InterruptHandle>,
    cfg: SqlConfig,
) -> LuaResult<()>

Register std.sql with caller-provided SqlConfig.

The config is stored in lua.app_data. std.kv (registered via crate::kv::register_with) shares the same SqlConfig slot, so calling either register_with after the other replaces the previous config — pass identical configs from the host or only set it once.