Ciao mpk2
I'm here because of `review_requested=yes` :)
Thanks for correcting the opening_hours here.

Volgs are listed as supermarkets in the Name Suggestion Index: https://nsi.guide/index.html?t=brands&k=shop&v=supermarket&tt=volg

The distinction between supermarket/convenience is not always easy, generally I think that Volgs have the 'role' of supermarkets.
I would change that on a case-by-case basis, especially for smaller Volgs.

Happy mapping,
habi

PS: We can also discuss in German if you'd like.