Rana Tahir Bilal on Instagram: "The no.1 mistake people make while building RAGS is Optimizing embeddings while ignoring metadata filtering. Vector search answers *how similar* documents are. Metadata decides which documents are even allowed to compete. If you don’t pre-filter, your system: - Searches 2019 docs for 2025 questions ❌ - Wastes 75% of the context window ❌ - Adds +30ms latency for worse recall ❌ 🔍 Production smell test Query: *“What were our Q4 2025 cloud infrastructure costs?”* If