Show indicator on weekly planner

It would be helpful to show indicators on the weekly planner when it is opened through a recipe to avoid double planned meals on a day.

For me the workflow is, open a recipe, add it from there to the weekly planner and I only see the dates and have to remember on which dates I haven't already planned a meal.

In this case a small indicator on which dates a meal is planned would be helpful. (Maybe even different colours for the different type of meals.)