Change the graph enum to be a many to many since it doesn't make sense beyond the global tests page
The trouble is, 'graph' being yes or no doesn't work when you start talking about, say, showing multiple series of the same film comparing things like developers, or developer time. Here instead a many to many table might be better for the generic film tests page.
For comparing various things some means to search or select specific tests would also be good - perhaps that might be done via URL params instead of many-to-many tables? I dunno. It works for now but this could be improved.