# Personal AI Infrastructure — Cache Module

**Version**: v1.2.3 | **Status**: Active | **Last Updated**: March 2026

## Overview

The Cache module provides multi-backend caching with TTL support, LRU eviction, distributed caching, and cache invalidation strategies for optimizing repeated computations and API calls.

## PAI Capabilities

- In-memory LRU cache for session-scoped data
- Disk-backed cache for expensive computation results
- Distributed caching (Redis-compatible) for multi-agent scenarios
- TTL-based expiration and manual invalidation
- Cache warming and preloading strategies

## Key Exports

| Export | Type | Purpose |
|--------|------|---------|
| Cache backends | Various | In-memory, disk, distributed cache |
| Cache decorators | Various | Function-level result caching |
| Invalidation strategies | Various | TTL, LRU, manual eviction |

## PAI Algorithm Phase Mapping

| Phase | Cache Contribution |
|-------|---------------------|
| **OBSERVE** | Cache codebase scan results for repeated access |
| **EXECUTE** | Cache LLM responses and analysis results |
| **LEARN** | Persist frequently accessed data for faster retrieval |

## Architecture Role

**Foundation Layer** — Cross-cutting caching consumed by `performance/` (CacheManager), `llm/` (response caching), `graph_rag/` (query caching), and `agentic_memory/` (hot memory).

## Navigation

- **Self**: [PAI.md](PAI.md)
- **Parent**: [../PAI.md](../PAI.md) — Source-level PAI module map
- **Root Bridge**: [../../../PAI.md](../../../PAI.md) — Authoritative PAI system bridge doc
- **Siblings**: [README.md](README.md) | [AGENTS.md](AGENTS.md) | [SPEC.md](SPEC.md) | [API_SPECIFICATION.md](API_SPECIFICATION.md)
