Replaces the L2 cache layer's SQLite implementation with an async SQLAlchemy-based database model (CacheEntries). Updates cache_manager.py to use db_query and db_save for cache operations, adds semantic cache handling with ChromaDB, and introduces async cache clearing and expiration cleaning methods. Adds the CacheEntries model and integrates it into the database API.
Introduces a ToolCache class to manage caching of tool invocation results with support for both exact and approximate (similarity-based) query matching. Includes methods for cache retrieval, storage, expiration, cleanup, and statistics. This helps improve efficiency by reusing previous results and reducing redundant tool executions.
Co-Authored-By: tt-P607 <68868379+tt-P607@users.noreply.github.com>
