Depends on what you mean by high profile. I would not say there are high profile projects but that's only because it's quite a new project. The latest version which imo is the first one to be a truly powerful one is only a month old. But there are people using in production for close to a year now.

Oh, and i've seen someone on HN saying it's used in something like the upcoming Kosovo land property tax system or something like that but i am not directly aware of that.

And since GraphQL is all the rage now, I'm using PostgREST here https://graphqlapi.com/ so i would say Haskell is picking up steam in terms of user facing products

You can apparently get a web-based UI too by simply using ng-admin: https://github.com/marmelab/ng-admin-postgrest