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Add LangChain vector sample - #2492

#2492
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shaowei6 wants to merge 1 commit into
getdozer:maingetdozer/dozer:mainfrom
shaowei6:codex/dozer-llm-langchain-sampleshaowei6/dozer:codex/dozer-llm-langchain-sampleCopy head branch name to clipboard
Open

Add LangChain vector sample#2492
shaowei6 wants to merge 1 commit into
getdozer:maingetdozer/dozer:mainfrom
shaowei6:codex/dozer-llm-langchain-sampleshaowei6/dozer:codex/dozer-llm-langchain-sampleCopy head branch name to clipboard

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@shaowei6

@shaowei6 shaowei6 commented May 17, 2026

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Adds a complete Dozer + LangChain sample for #1690.

Summary:

  • Adds samples/llm-vector-langchain with customer profiles, transactions, and credit card product data.
  • Includes a Dozer config that exposes the datasets as REST endpoints for the sample app.
  • Builds a LangChain + Chroma recommendation flow, with OpenAI support when OPENAI_API_KEY is set and a deterministic local fallback for development.
  • Adds offline tests for the recommendation/context-building helpers.

Testing:

  • python -m unittest discover -s tests
  • python -m py_compile app.py dozer_client.py recommender.py tests/test_recommender.py

/claim #1690
Closes #1690

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Sample: Dozer + LLM + Vector database + Langchain sample

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