Optimize routes for large datasets

**Description**
Currently validation lacks proper sorting support.

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

**Priority**: Low/Medium

No file, test, or entry point is identified in the issue. Start by locating the route-handling and validation code, then determine how large datasets are processed and where sorting can be configured. Done means validation supports configurable sorting with documented sensible defaults, with coverage for the relevant behavior.

Written by the indexing model from the issue text.