Customers will receive alerts based on the real context of the moment they subscribed to the alert (sho, theme & language) SQL update table : `ps_mailalert_customer_oos` ========================================= ALTER TABLE `ps_mailalert_customer_oos` ADD `id_lang` INT( 10 ) UNSIGNED NOT NULL , DROP PRIMARY KEY , ADD PRIMARY KEY ( `id_customer` , `customer_email` , `id_product` , `id_product_attribute` , `id_shop` ) ;