re #470

db/migrations/5.1.21_missing_indices_v50.php

 <?php
 final class MissingIndicesV50 extends Migration
 {
+    public function description()
+    {
+        return 'Add missing indices on some tables';
+    }
+
     public function up()
     {
         $query = "CREATE INDEX `range_id` ON `mvv_files_ranges` (`range_id`)";