Внесите уже изменения в core/model.php

  public function getContentTableStruct(){
 
        return array(
            'id'                 => array('type' => 'primary'),
            'title'              => array('type' => 'varchar', 'size' => 100, 'fulltext' => true),
            'content'            => array('type' => 'text'),

 
  public function getContentTableStruct(){
 
        return array(
            'id'                 => array('type' => 'primary'),
            'title'              => array('type' => 'varchar', 'size' => 255, 'fulltext' => true),
            'content'            => array('type' => 'text'),