Update index

app/Models/Pages/Admin/Install.php

@@ -1055,7 +1055,7 @@ class Install extends Admin
                 'forum_id_idx'      => ['forum_id'],
                 'last_post_idx'     => ['last_post'],
                 'first_post_id_idx' => ['first_post_id'],
-                'multi_1_idx'       => ['moved_to', 'forum_id', 'num_replies'],
+                'multi_1_idx'       => ['moved_to', 'forum_id', 'num_replies', 'last_post'],
             ],
             'ENGINE' => $this->DBEngine,
         ];

app/Models/Pages/Admin/Update.php

@@ -887,7 +887,7 @@ class Update extends Admin
         $this->c->DB->addIndex('::posts', 'editor_id_idx', ['editor_id']);
 
         $this->c->DB->dropIndex('::topics', 'moved_to_idx');
-        $this->c->DB->addIndex('::topics', 'multi_1_idx', ['moved_to', 'forum_id', 'num_replies']);
+        $this->c->DB->addIndex('::topics', 'multi_1_idx', ['moved_to', 'forum_id', 'num_replies', 'last_post']);
 
         return null;
     }