Consider deprecating old models API

**Description**
Currently routes lacks proper encryption support.

**Proposed solution**
Add configurable encryption with sensible defaults.

**Priority**: Low/Medium

Start by reconciling the title about deprecating the old models API with the description about route encryption. No files, tests, entry points, encryption mechanism, or acceptance criteria are named, so first locate the routes and models API in the repository and clarify the intended scope and sensible defaults with maintainers. Done should include agreed encryption behavior and validation that routes support it.

Written by the indexing model from the issue text.