LangChain Postgres Skill

Expert assistance for langchain-postgres: pgvector-backed vector store and PostgreSQL chat history for LangChain. Use v2 API (PGVectorStore + PGEngine) for new projects; v1 (PGVector) is legacy.

Install:

pip install -U langchain-postgres psycopg[binary] psycopg-pool
# Start PostgreSQL with pgvector:
docker run -p 5432:5432 -e POSTGRES_PASSWORD=password pgvector/pgvector:pg16

Reference: references/api.md (500 KB — full API reference).

When to Use This Skill