Module vector_cache 

Vector embedding cache with LRU eviction.

Provides an in-memory cache for embedding vectors with:

• LRU eviction (configurable max entries)
• Cache warming (preload frequently accessed vectors)
• Hit/miss statistics tracking
• Memory-bounded eviction
• Cache invalidation (by key, by prefix, clear all)
• Optional per-entry TTL-based expiry
• Batch get/put operations
• Cache persistence (save/load)

Structs

CacheSnapshot

A serializable representation of the cache for persistence.

CacheStatistics

Hit/miss statistics for the cache.

VectorCache

An LRU cache for embedding vectors.

VectorCacheConfig

Configuration for the vector cache.