presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/ShardCleaner.java/ShardCleaner/abortOldTransactions
class ShardCleaner:    @VisibleForTesting
    void abortOldTransactions()
    {
        dao.abortOldTransactions(maxTimestamp(maxTransactionAge));
    }