$start = $dbw->selectField( 'recentchanges', 'MIN(rc_id)', false, __METHOD__ );
if ( !$start ) {
$this->output( "Nothing to do.\n" );
$start = $dbw->selectField( 'recentchanges', 'MIN(rc_id)', false, __METHOD__ );
if ( !$start ) {
$this->output( "Nothing to do.\n" );