Part 3 of 3. 391 real SCOTUS cases, four retrieval strategies running side by side, multi-hop Cypher that no hybrid search can match, and the production-ready 3-stage architecture you should actually ship.
Part 2 of 3. A complete Docker setup for Postgres 16 with pgvector and Apache AGE, plus your first vector similarity query and your first Cypher traversal — with the gotchas that cost me an afternoon the first time.
Part 1 of 3. Users ask three shapes of questions and only one of them needs a graph. Honest benchmarks, a 3-stage retrieval architecture, and why graph is a multiplier — not a replacement.
Runnable sample app: Postgres 16 with Apache AGE and pgvector, a FastAPI orchestrator, and four retrieval strategies compared side by side on 391 real SCOTUS cases.
A layered training corpus — domain pairs, public ballast, and a reusable Postgres syntax corpus — is 80% of the work for a NL2SQL LoRA. The training config is YAML and patience.
A step-by-step walkthrough of building a PostgreSQL semantic layer in pg_agents — crawl the schema, enrich it, define your vocabulary, lock down categoricals, and promote the queries that work.
Raw LLMs hit 10-20% accuracy on real enterprise schemas with cryptic column names and tribal-knowledge joins. Here’s why, and the semantic-layer fix that takes you from toy to production.
Local-first MCP server that indexes code and docs into Postgres + pgvector for hybrid retrieval by LLM coding clients.
