/**
  * Keeps track of the given relationship and makes use of it later in {@link #accept(long)} and
  * {@link #apply(long, long)}
  *
  * @param deletedRelationship relationship that has been deleted in this transaction.
  */
 public void deleted(RelationshipRecord deletedRelationship) {
   nodes.add(deletedRelationship.getFirstNode());
   nodes.add(deletedRelationship.getSecondNode());
   relationships.put(deletedRelationship.getId(), deletedRelationship);
 }