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feat(examples): add LangChain and ChromaDB vector similarity search sample with Dozer - #2553

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cocvn157 wants to merge 1 commit into
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cocvn157:feat-llm-vector-langchain-sample-1690
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cocvn157 wants to merge 1 commit into
getdozer:mainfrom
cocvn157:feat-llm-vector-langchain-sample-1690

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@cocvn157 cocvn157 commented Nov 6, 2026

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Adds a sample application in use-cases/llm-vector-langchain demonstrating real-time document ingestion with Dozer and semantic vector similarity search using LangChain and ChromaDB. The pipeline streams knowledge base articles from PostgreSQL through Dozer's gRPC endpoints (articles and priority_articles) into a Python consumer that indexes vector embeddings and answers natural-language queries with source citations. Includes a unit test suite in tests/test_qa_pipeline.py covering gRPC record parsing, incremental indexing/deletion, and retrieval-augmented question answering.

Fixes #1690
/claim #1690

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Sample: Dozer + LLM + Vector database + Langchain sample

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