No risks, just either have to work around the changes if you update, or apply them to the new version files.
Via phpMyAdmin alter the table...
ALTER TABLE `ps_mailalert_customer_oos` ADD `date_add` DATE NOT NULL
-----[ OPEN ]-----
modules/mailalerts/mailalerts.php
-----[ FIND ]-----
`id_product_attribute` int(10) unsigned NOT NULL,
-----[ ADD AFTER ]-----
`date_add` date NOT NULL,
-----[ OPEN ]-----
modules/statsoos/statsoos.php
-----[ FIND ]-----
SELECT `id_customer`, `customer_email`, `id_product`, `id_product_attribute`
-----[ REPLACE WITH ]-----
SELECT `id_customer`, `customer_email`, `id_product`, `id_product_attribute`, `date_add`
-----[ FIND ]-----
| '.$this->l('Customer').' | '.$this->l('E-mail').' | '.$this->l('Product').' | '.$this->l('Attribute').' |
';
-----[ REPLACE WITH ]-----
| '.$this->l('Date').' | '.$this->l('Customer').' | '.$this->l('E-mail').' | '.$this->l('Product').' | '.$this->l('Attribute').' |
';
-----[ FIND ]-----
| '.$customerName.' |
-----[ ADD BEFORE ]-----
| '.$oosPage['date_add'].' |
-----[ OPEN ]-----
modules/mailalerts/mailalerts-ajax_add.php
-----[ FIND ]-----
REPLACE INTO `'._DB_PREFIX_.'mailalert_customer_oos` (`id_customer`, `customer_email`, `id_product` , `id_product_attribute`)
VALUES ('.intval($id_customer).', ''.pSQL($customer_email).'', '.intval($id_product).', '.intval($id_product_attribute).')'))
-----[ REPLACE WITH ]-----
REPLACE INTO `'._DB_PREFIX_.'mailalert_customer_oos` (`id_customer`, `customer_email`, `id_product` , `id_product_attribute`, `date_add`)
VALUES ('.intval($id_customer).', ''.pSQL($customer_email).'', '.intval($id_product).', '.intval($id_product_attribute).', ''.date('Y-m-d').'')'))
I think these are the only changes, let me know how it goes as I may have forgotten a change somewhere - was awhile ago I added this.