CRM/Mailing/EventMailingEventTrackableURLOpencivicrm_mailing_event_trackable_url_openMailing Link ClickthroughsTracks when a TrackableURL is clicked by a recipient.trueCiviMail id int unsigned true ID Number id true event_queue_id int unsigned true FK to EventQueue Recipient EntityRef event_queue_id civicrm_mailing_event_queue id CASCADE trackable_url_id int unsigned true FK to TrackableURL Mailing Link EntityRef trackable_url_id civicrm_mailing_trackable_url id CASCADE time_stamp timestamp CURRENT_TIMESTAMP true Opened Date Date When this trackable URL open occurred.