FHC-Core/application/core/MY_Model.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class MY_Model extends CI_Model 
{
	function __construct()  
	{
        parent::__construct();
    }
}

class DB_Model extends MY_Model 
{
	function __construct()  
	{
        parent::__construct();
		$this->load->database();
    }

}