code: private void createSequencesConstraintsStatements(Statements statements, Iterable<Sequence> sequences) {
  		Statement statement = createUniqueConstraintStatement( SEQUENCE_NAME_PROPERTY, NodeLabel.SEQUENCE.name() );
  		statements.addStatement( statement );
  	}
docs: Create the sequence nodes setting the initial value if the node does not exist already.
  <p>
  All nodes are created inside the same transaction.