diff --git a/lib/classes/event/message_deleted.php b/lib/classes/event/message_deleted.php
index 7d5087e1bc4..b991853b309 100644
--- a/lib/classes/event/message_deleted.php
+++ b/lib/classes/event/message_deleted.php
@@ -32,7 +32,6 @@ defined('MOODLE_INTERNAL') || die();
  * @property-read array $other {
  *      Extra information about event.
  *
- *      - string $messagetable: the table we marked the message as deleted from (message/message_read).
  *      - int messageid: the id of the message.
  *      - int useridfrom: the id of the user who received the message.
  *      - int useridto: the id of the user who sent the message.
@@ -51,11 +50,11 @@ class message_deleted extends base {
      * @param int $userfromid the user who the message was from.
      * @param int $usertoid the user who the message was sent to.
      * @param int $userdeleted the user who deleted it.
-     * @param string $messagetable the table we are marking the message as deleted in.
      * @param int $messageid the id of the message that was deleted.
+     * @param int $muaid The id in the message_user_actions table
      * @return message_deleted
      */
-    public static function create_from_ids($userfromid, $usertoid, $userdeleted, $messagetable, $messageid) {
+    public static function create_from_ids($userfromid, $usertoid, $userdeleted, $messageid, $muaid) {
         // Check who was deleting the message.
         if ($userdeleted == $userfromid) {
             $relateduserid = $usertoid;
@@ -66,11 +65,11 @@ class message_deleted extends base {
         // We set the userid to the user who deleted the message, nothing to do
         // with whether or not they sent or received the message.
         $event = self::create(array(
+            'objectid' => $muaid,
             'userid' => $userdeleted,
             'context' => \context_system::instance(),
             'relateduserid' => $relateduserid,
             'other' => array(
-                'messagetable' => $messagetable,
                 'messageid' => $messageid,
                 'useridfrom' => $userfromid,
                 'useridto' => $usertoid
@@ -84,7 +83,8 @@ class message_deleted extends base {
      * Init method.
      */
     protected function init() {
-        $this->data['crud'] = 'u';
+        $this->data['objecttable'] = 'message_user_actions';
+        $this->data['crud'] = 'c';
         $this->data['edulevel'] = self::LEVEL_OTHER;
     }
 
@@ -126,10 +126,6 @@ class message_deleted extends base {
             throw new \coding_exception('The \'relateduserid\' must be set.');
         }
 
-        if (!isset($this->other['messagetable'])) {
-            throw new \coding_exception('The \'messagetable\' value must be set in other.');
-        }
-
         if (!isset($this->other['messageid'])) {
             throw new \coding_exception('The \'messageid\' value must be set in other.');
         }
@@ -143,11 +139,13 @@ class message_deleted extends base {
         }
     }
 
+    public static function get_objectid_mapping() {
+        return array('db' => 'message_user_actions', 'restore' => base::NOT_MAPPED);
+    }
+
     public static function get_other_mapping() {
         // Messages are not backed up, so no need to map them on restore.
         $othermapped = array();
-        // The messageid table varies so it cannot be mapped.
-        $othermapped['messageid'] = array('db' => base::NOT_MAPPED, 'restore' => base::NOT_MAPPED);
         $othermapped['useridfrom'] = array('db' => 'user', 'restore' => base::NOT_MAPPED);
         $othermapped['useridto'] = array('db' => 'user', 'restore' => base::NOT_MAPPED);
         return $othermapped;
diff --git a/lib/classes/event/message_sent.php b/lib/classes/event/message_sent.php
index e3309191361..9b3a8c5244e 100644
--- a/lib/classes/event/message_sent.php
+++ b/lib/classes/event/message_sent.php
@@ -32,7 +32,6 @@ defined('MOODLE_INTERNAL') || die();
  * @property-read array $other {
  *      Extra information about event.
  *
- *      - int messageid: the id of the message.
  *      - int courseid: the id of the related course.
  * }
  *
@@ -69,14 +68,11 @@ class message_sent extends base {
         }
 
         $event = self::create(array(
+            'objectid' => $messageid,
             'userid' => $userfromid,
             'context' => \context_system::instance(),
             'relateduserid' => $usertoid,
             'other' => array(
-                // In earlier versions it can either be the id in the 'message_read' or 'message' table.
-                // Now it is always the id from 'message' table. Please note that the record is still moved
-                // to the 'message_read' table later when message marked as read.
-                'messageid' => $messageid,
                 'courseid' => $courseid
             )
         ));
@@ -88,6 +84,7 @@ class message_sent extends base {
      * Init method.
      */
     protected function init() {
+        $this->data['objecttable'] = 'messages';
         $this->data['crud'] = 'c';
         $this->data['edulevel'] = self::LEVEL_OTHER;
     }
@@ -133,8 +130,9 @@ class message_sent extends base {
         // The add_to_log function was only ever called when we sent a message from one user to another. We do not want
         // to return the legacy log data if we are sending a system message, so check that the userid is valid.
         if (\core_user::is_real_user($this->userid)) {
+            $messageid = $this->other['messageid'] ?? $this->objectid; // For BC we may have 'messageid' in other.
             return array(SITEID, 'message', 'write', 'index.php?user=' . $this->userid . '&id=' . $this->relateduserid .
-                '&history=1#m' . $this->other['messageid'], $this->userid);
+                '&history=1#m' . $messageid, $this->userid);
         }
 
         return null;
@@ -153,26 +151,18 @@ class message_sent extends base {
             throw new \coding_exception('The \'relateduserid\' must be set.');
         }
 
-        if (!isset($this->other['messageid'])) {
-            throw new \coding_exception('The \'messageid\' value must be set in other.');
-        }
-
         if (!isset($this->other['courseid'])) {
             throw new \coding_exception('The \'courseid\' value must be set in other.');
         }
     }
 
     public static function get_objectid_mapping() {
-        // Messages are not backed up, so no need to map them.
-        return false;
+        return array('db' => 'messages', 'restore' => base::NOT_MAPPED);
     }
 
     public static function get_other_mapping() {
-        // Messages are not backed up, so no need to map them on restore.
         $othermapped = array();
-        // The messages table could vary for older events - so cannot be mapped.
-        $othermapped['messageid'] = array('db' => base::NOT_MAPPED, 'restore' => base::NOT_MAPPED);
-        $othermapped['courseid'] = array('db' => base::NOT_MAPPED, 'restore' => base::NOT_MAPPED);
+        $othermapped['courseid'] = array('db' => 'course', 'restore' => base::NOT_MAPPED);
         return $othermapped;
     }
 }
diff --git a/lib/classes/event/message_viewed.php b/lib/classes/event/message_viewed.php
index 8e129475114..35ae1ffae73 100644
--- a/lib/classes/event/message_viewed.php
+++ b/lib/classes/event/message_viewed.php
@@ -46,7 +46,7 @@ class message_viewed extends base {
      * Init method.
      */
     protected function init() {
-        $this->data['objecttable'] = 'message_read';
+        $this->data['objecttable'] = 'message_user_actions';
         $this->data['crud'] = 'c';
         $this->data['edulevel'] = self::LEVEL_OTHER;
     }
@@ -97,15 +97,13 @@ class message_viewed extends base {
     }
 
     public static function get_objectid_mapping() {
-        // Messages are not backed up, so no need to map them.
-        return array('db' => 'message_read', 'restore' => base::NOT_MAPPED);
+        return array('db' => 'message_user_actions', 'restore' => base::NOT_MAPPED);
     }
 
     public static function get_other_mapping() {
         // Messages are not backed up, so no need to map them on restore.
         $othermapped = array();
-        // The messages table could vary for older events - so cannot be mapped.
-        $othermapped['messageid'] = array('db' => base::NOT_MAPPED, 'restore' => base::NOT_MAPPED);
+        $othermapped['messageid'] = array('db' => 'messages', 'restore' => base::NOT_MAPPED);
         return $othermapped;
     }
 }