$dbw->doAtomicSection( __METHOD__, function ( IDatabase $dbw, $fname ) {
$dbw->insert( 'revision', self::$dummyRev, $fname );
$id = $dbw->insertId();
$dbw->doAtomicSection( __METHOD__, function ( IDatabase $dbw, $fname ) {
$dbw->insert( 'revision', self::$dummyRev, $fname );
$id = $dbw->insertId();