Module service 

Cache service over localcache (Appendix A §8–§12).

Rules enforced here:

• cache payloads live in orbok-cache.sqlite3, never in the catalog (Appendix A §3);
• the catalog stays authoritative — this service stores derived payloads only, keyed by canonical source path;
• reads and writes take a ValidatedPath so nothing outside the PathGuard boundary can be cached (RFC-003 §8 carried through);
• cleanup runs only from a validated CleanupPlan (RFC-001 §14);
• engines self-register in the catalog cache_engines table (RFC-002 §7.16) so the storage dashboard can enumerate them.

Structs

CacheCleanupOutcome

Result of a cache-side cleanup run.

CacheService

The orbok cache service. One per data directory.

EngineOptions

Tuning for one engine.

NamespaceUsage

Per-namespace usage for storage accounting (Appendix A §11).