Make the string ts_archived

core/DataTable.php

@@ -170,7 +170,7 @@ class DataTable implements DataTableInterface, \IteratorAggregate, \ArrayAccess
     const MAX_DEPTH_DEFAULT = 15;
 
     /** Name for metadata that describes when a report was archived. */
-    const ARCHIVED_DATE_METADATA_NAME = 'archived_date';
+    const ARCHIVED_DATE_METADATA_NAME = 'ts_archived';
 
     /** Name for metadata that describes which columns are empty and should not be shown. */
     const EMPTY_COLUMNS_METADATA_NAME = 'empty_column';