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`
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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` ) ;
