Moved to Model model

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | todo

Adopted Model persistence model, analogue of https://github.com/symfony-cmf/RoutingBundle/pull/112/files#diff-20