Dear @erik_andersson,
Please have a look at this post from @Federico_Stefanato, where he has made a template that can be adapted and the transition steps to be set according your flow
In the table “workflows” the actual reporting can be made, and this table can be amended with a starting, ending date or whatever relevant
Doc idea to build (just for fun & learn)
Just one more advice, learned from @Paul_Danyliuk, work with views from these actual bases and then filter the view with for example only the "open"active instances.
In this way you keep it clean and in the actual bases you will always have the references.
I will be glad to build it this weekend if you feel the need for it 