   `customer_id` int(10) unsigned DEFAULT NULL COMMENT 'Customer Id',
   `product_id` int(10) unsigned NOT NULL COMMENT 'Product Id',
   `store_id` smallint(5) unsigned DEFAULT NULL COMMENT 'Store Id',
-  `added_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Added At',
+  `added_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'Added At',
   PRIMARY KEY (`index_id`),
   UNIQUE KEY `REPORT_COMPARED_PRODUCT_INDEX_VISITOR_ID_PRODUCT_ID` (`visitor_id`,`product_id`),
   UNIQUE KEY `REPORT_COMPARED_PRODUCT_INDEX_CUSTOMER_ID_PRODUCT_ID` (`customer_id`,`product_id`),

  `is_customer_notified` int(11) DEFAULT NULL COMMENT 'Is Customer Notified',
  `is_visible_on_front` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Is Visible On Front',
  `comment` text COMMENT 'Comment',
  `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Created At',
  PRIMARY KEY (`entity_id`),
  KEY `SALES_SHIPMENT_COMMENT_CREATED_AT` (`created_at`),
  KEY `SALES_SHIPMENT_COMMENT_PARENT_ID` (`parent_id`),

  `sku` varchar(64) DEFAULT NULL COMMENT 'SKU',
  `has_options` smallint(6) NOT NULL DEFAULT '0' COMMENT 'Has Options',
  `required_options` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Required Options',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'Creation Time',
  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'Update Time',
  PRIMARY KEY (`entity_id`),
  KEY `CATALOG_PRODUCT_ENTITY_ATTRIBUTE_SET_ID` (`attribute_set_id`),
  KEY `CATALOG_PRODUCT_ENTITY_SKU` (`sku`),
