fixup! fix(UserMountCache): Add back unique index for oc_mounts and use normal insert

Author: provokateurin

core/Listener/AddMissingIndicesListener.php

@@ -186,12 +186,6 @@ public function handle(Event $event): void {
 			'mounts_class_index',
 			['mount_provider_class']
 		);
-		$event->addMissingIndex(
-			'mounts',
-			'mounts_user_root_path_index',
-			['user_id', 'root_id', 'mount_point'],
-			['lengths' => [null, null, 128]]
-		);
 
 		$event->addMissingIndex(
 			'systemtag_object_mapping',