#Vector Search

AI Tools

AI Context Caching Is Cache Invalidation With Worse Tooling

Context engineering borrowed cache vocabulary but skipped the part that matters: key design. Here's how versioned, provenance-based keys fix stale retrieval where TTL clocks can't.

August 17, 2026 AI Tools

pgvector Hybrid Search vs. Pure Vector: The Query Patterns That Flip the Winner

Pure cosine similarity returns garbage on version numbers, SKUs, and exact phrases. The fix is hybrid search in Postgres — two indexes, one CTE, and a rule for which leg to weight.

May 18, 2026