Sorting importers by "Last Run" brings up a DataTables alert, does not change order.

[lsat12357]

On the importers index page, clicking on "Last Run" brings up a DataTables alert box with the following message:
DataTables warning: table id=importers-table - Ajax error. For more information about this error, please see http://datatables.net/tn/7

In the console, there is an ActiveRecord error:
ActiveRecord::StatementInvalid (PG::UndefinedColumn: ERROR: column "last_imported_at" does not exist
...
SELECT "bulkrax_importers".* FROM "bulkrax_importers" ORDER BY last_imported_at asc