Provision house / bookbinder / barracks "inactive" sign suggestion

Suggestion : inactive sign when Provision house / bookbinder / barracks are not in production

When many of my buildings are out of resource, they show the "out of resource" sign, so I know i need to do something.

When I sleep a building, i get "ZZzzz" to show it is sleeping.

However provision house / bookbinder / barracks all work on a different principle. I understand that. I must set them to work.
What I find frustrating is that I sometimes miss when a production is complete. OK, a message pops up, but i dont always notice.
Recently I have found that I thought i set the bookbinder to produce a book, but when i come back it hasnt started. I know this is my error. However the game could tell me that in fact the bookbinder is having a "day off".

So my suggestion is - a sign on these buildings that show when they are not "actively producing an order".

The game developers could make some fun signs for each building too, if required.