localize collection manipulations

[art-in]

One issue with arch I've found is complexity with entity abstraction levels (dbo - model - viewmodel).
Particularly: constant remapping entities from one level to another.
Abstraction levels has certain advantages, but when working with entity you always have to ask yourself - is this dbo or model? should I remap it?

Instead we going to localize dbo ops in one place. In all other places it will always be model.