**Area:** testing · **Effort:** S\n\n**What:** Write tests for cache hit, cache miss, TTL expiry, and invalidation scenarios.\n\n**Why:** Caching bugs silently serve stale contract data.\n\n**Hints:**\n- `backend/src/common/cache/contract-cache.service.ts`
Area: testing · Effort: S\n\nWhat: Write tests for cache hit, cache miss, TTL expiry, and invalidation scenarios.\n\nWhy: Caching bugs silently serve stale contract data.\n\nHints:\n-
backend/src/common/cache/contract-cache.service.ts