+ if ( $wgChangeTagsSchemaMigrationStage === MIGRATION_OLD ) {
+ // Return "success", but don't flag it as done so the next run will retry
+ $this->output( '... Not run, $wgChangeTagsSchemaMigrationStage === MIGRATION_OLD' . "\n" );
+ return true;
+ }
+ return parent::execute();
+ }
+
+ protected function doDBUpdates() {