docs: 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