Optimize middleware for large datasets

**Description**
Currently helpers lacks proper filtering support.

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

**Priority**: Low/Medium

Start by locating the middleware and helpers referenced in the issue, then inspect how current data selection and configuration work. Look for existing tests covering middleware or helper behavior before deciding where filtering belongs. Done means configurable filtering is available with sensible defaults and its behavior is covered by tests.

Written by the indexing model from the issue text.