$edits = $dbr->selectField( 'revision', 'COUNT(*)', '', __METHOD__ );
$edits += $dbr->selectField( 'archive', 'COUNT(*)', '', __METHOD__ );
$edits = $dbr->selectField( 'revision', 'COUNT(*)', '', __METHOD__ );
$edits += $dbr->selectField( 'archive', 'COUNT(*)', '', __METHOD__ );