diff --git a/lib/db/install.xml b/lib/db/install.xml
index 1a994f74a39..c1130151771 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="lib/db" VERSION="20231004" COMMENT="XMLDB file for core Moodle tables"
+<XMLDB PATH="lib/db" VERSION="20231123" COMMENT="XMLDB file for core Moodle tables"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../lib/xmldb/xmldb.xsd"
 >
@@ -754,6 +754,8 @@
       </KEYS>
       <INDEXES>
         <INDEX NAME="useridfrom" UNIQUE="false" FIELDS="useridfrom" COMMENT="The useridfrom would normally be a foreign key to the users table. But it can also contain some extra negative values with special semantics (-10 or -20 for no-reply or support user). Therefore we can't make it a foreign key and the index must be created explicitly."/>
+        <INDEX NAME="timecreated" UNIQUE="false" FIELDS="timecreated" COMMENT="Index on timecreated to speed up deletion of expired notifications."/>
+        <INDEX NAME="timeread" UNIQUE="false" FIELDS="timeread" COMMENT="Index on timeread to speed up deletion of read notifications."/>
       </INDEXES>
     </TABLE>
     <TABLE NAME="message_contacts" COMMENT="Maintains lists of contacts between users">
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index b805206224c..58484cee8dd 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -856,5 +856,28 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2023110900.00);
     }
 
+    if ($oldversion < 2023111600.01) {
+
+        // Define index timecreated (not unique) to be added to notifications.
+        $table = new xmldb_table('notifications');
+        $createdindex = new xmldb_index('timecreated', XMLDB_INDEX_NOTUNIQUE, ['timecreated']);
+
+        // Conditionally launch add index timecreated.
+        if (!$dbman->index_exists($table, $createdindex)) {
+            $dbman->add_index($table, $createdindex);
+        }
+
+        // Define index timeread (not unique) to be added to notifications.
+        $readindex = new xmldb_index('timeread', XMLDB_INDEX_NOTUNIQUE, ['timeread']);
+
+        // Conditionally launch add index timeread.
+        if (!$dbman->index_exists($table, $readindex)) {
+            $dbman->add_index($table, $readindex);
+        }
+
+        // Main savepoint reached.
+        upgrade_main_savepoint(true, 2023111600.01);
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index 2f71a86ceca..8e352642d71 100644
--- a/version.php
+++ b/version.php
@@ -29,7 +29,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$version  = 2023112400.00;              // YYYYMMDD      = weekly release date of this DEV branch.
+$version  = 2023112400.01;              // YYYYMMDD      = weekly release date of this DEV branch.
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.
 $release  = '4.4dev (Build: 20231124)'; // Human-friendly version name