I see, i guess the main issue with such a plugin would be to have the expectations low enough 
I think instead of stuff like prepared statements i would then rather do stuff like:
- Automatically create database tables from a given UObject
- load a UObject from the database
- persist a UObject into the database
This may get a bit tricky with child objects, i am not really sure if that would be feasible. Also, automatically altering the table structure if the object is changed (i.e. if you add a new property) would not be implemented. If you want to seriously use a database backend you should usually create the database tables by hand and set primary keys, indices etc. so it will perform well even with much data in it.
I think i will finish the “persist UObject” thing and then make a WIP thread in the marketplace section to get what people are actually thinking about this
Cheers,