Module cache 

Per-edge query result cache.

Hash-keyed by (query_fingerprint, params_hash). Each entry carries a monotonic version so an invalidation can sweep everything older than a known commit point in one pass.

LRU eviction kicks in at max_entries. Concurrent reads share a parking_lot RwLock; concurrent writes are serialised by the same lock — fine because writes are rare on the edge (only on pull-on-miss + invalidation sweeps).

Structs

CacheEntry

One cached query result.

CacheKey

Cache key — the (fingerprint, params_hash) pair. Both sides are strings so the same key works whether params are plain text or hashed by an upstream caller.

EdgeCache

LRU + version + TTL cache. Cheap to clone via Arc.

EdgeCacheStats