Consider deprecating old core API

**Description**
Currently api lacks proper caching support.

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

**Priority**: Low/Medium

Start by locating the core API entry point and checking how requests are currently handled. Review whether any caching behavior or tests already exist, then define the configurable options and sensible defaults before implementing them. Done means the API supports configurable caching and the behavior is covered by validation or tests.

Written by the indexing model from the issue text.