Hello,
In the schema editor of Valentina Studio Pro, I have noticed that foreign keys appear under the Links subcategory under the tree view. When I go to edit a table, under the constraints tab I see a foreign keys tab but no entries appear there, not even the ones associated with fields in the edited table. I can understand from the development point of view the need to have a different interface to create the links (foreign keys) but they should at least be listed under the appropriate table. The tree view of the links is extremely generic and very hard to see if all the necessary foreign keys for a certain table have been created.