Hi!
In the past few months, the development team has mentored a student, Olga, to help us developing a user script https://www.wikidata.org/wiki/User:Jonas_Kress_%28WMDE%29/check_constraints.js that displays the constraints on the item pages.
This is awesome. Thanks so much for developing it!
Now, is there a place to submit bug reports? :) I have noticed this one: https://www.wikidata.org/wiki/Q5066005#P569 shows 2 violations, though the date appears to be completely fine.