Changes! Changes!
Sorry @danohu for interrupting you, but I had to change the software design … tried eComma thoroughly, and it does not seem to be the right base software for us 
I will detail this in the software design wiki after sleep.
So, could you implement this based on Drupal module annotator and the associated storage module annotation? Tell us how much work you had to redo and we can find a solution re. the budget …