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pgvector

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pgvector is an open-source extension that adds vector data types and similarity-search operators to PostgreSQL, supporting cosine distance, L2 distance, and inner product with both HNSW and IVFFlat indexing. It lets applications store embeddings alongside relational data in the same database and transaction, and is widely used for semantic search, recommendation systems, and retrieval-augmented generation, with cloud providers including Supabase, Neon, and Azure offering built-in support.