Show HN: NeuronDB – Embeddings and vector search for PostgreSQL (github.com)

NeuronDB runs vector storage, similarity search, and RAG primitives directly inside PostgreSQL. The goal focuses on keeping embeddings, metadata, and query planning in one system. The repository includes a PostgreSQL extension, vector indexing logic, and SQL-first query patterns. Feedback on design tradeoffs, performance behavior, and failure modes under load would help.