Optimize services for large datasets

**Description**
Currently controllers lacks proper pagination support.

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

**Priority**: Low/Medium

Start by locating the controllers and their current handling of large datasets. Review how list operations work and identify where configurable pagination and defaults belong. Done means controller responses are paginated with sensible configurable defaults and existing behavior remains covered by the relevant tests, if present.

Written by the indexing model from the issue text.