Add rate limiting for filtering

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

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

**Priority**: Low/Medium

No files, tests, or entry points are named. Start by locating the validation and filtering implementation, then clarify whether the intended change is search support, rate limiting, or both, including configurable options and sensible defaults. The issue does not define completion criteria.

Written by the indexing model from the issue text.