def relate_to(self, part, reltype):
        rel = self.rels.get_or_add(reltype, part)
        return rel.rId
:param timestamp: Exections older than this timestamp will be deleted.
dataset/ETHPy150Open scanny/python-pptx/pptx/opc/package.py/OpcPackage.relate_to--crossover with--dataset/ETHPy150Open StackStorm/st2/st2common/st2common/garbage_collection/executions.py/purge_executions