[Wikidata-bugs] [Maniphest] [Created] T173771: add an "acyclic" constraint?

[Bugreporter]

Bugreporter created this task. Bugreporter added projects: Wikibase-Quality, Wikibase-Quality-Constraints. Herald added a subscriber: Aklapper. Herald added a project: Wikidata.

TASK DESCRIPTION

Some properties (e.g. P22, P171 etc.) are easy to have value cycles (A=>B=>C=>...=>A). Maybe this can be prevented.

See https://www.wikidata.org/wiki/Property_talk:P22#Entity_being_their_own_ancestor

TASK DETAIL

https://phabricator.wikimedia.org/T173771

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To: Bugreporter
Cc: Aklapper, Bugreporter, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, Agabi10, Izno, Wikidata-bugs, aude, Mbch331

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