How to create a database that useful to the home and small orchard growers is something I have given thought to. It is why I spun up my own personal copy of GRIN. My research left me with the conclusion the hardest part of this endeavor is coming up with a set of useful descriptors.
You may already be familiar with the USDA descriptors GRIN uses.
This is a link to the European Cooperative Program for Plant Genetics Resources ECPGR: Fruit
The prunus descriptors where all adopted back in the 1980’s
Since then Malus/Pyrus has been revisited several times since 2012 to revise the standard. Prunus began revising in 2011
I had but I can not locate at the moment the new proposed descriptors. I think its great to keep up with standards but at the same time I dont think most would not match up with what your proposing. Which bring me back to my original question what descriptors do people really want?