Deletes the relationship.

    :param manager:  Neo4jDBSessionManager
    :param relationship_id: Internal Neo4j relationship id
    :return: bool

def delete_relationship(manager, relationship_id):
    """
    Deletes the relationship.

    :param manager:  Neo4jDBSessionManager
    :param relationship_id: Internal Neo4j relationship id
    :return: bool
    """
    q = """
        MATCH ()-[r]->()
        WHERE ID(r) = {relationship_id}
        DELETE r
        """
    with manager.session as s:
        s.run(q, {'relationship_id': int(relationship_id)})
    return True