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Open WebUI v0.11.4: per-file metadata and faster hybrid search on large knowledge bases

Use cases
Open WebUI release v0.11.4, published on September 21, brings two direct RAG improvements: metadata attached to uploaded files now travels with each chunk and arrives with the retrieved sources, and hybrid search now runs natively in the database (pgvector) instead of loading the whole collection into memory, making large knowledge bases dramatically faster. The slim image also drops to around 175 MB.

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