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LangChain

LangChain supplies code to connect a document loader, vector store and retrieval flow.

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Where does LangChain sit between the app and the database?

The framework can connect loading, splitting, creating vectors and finding passages. The store you configure is where vectors live. Use the app’s access checks before choosing which passages to retrieve. The exact filters you can apply depend on the store integration.

What should travel with the code if you switch stores?

The core framework is MIT-licensed. Connected models, hosted stores and other services have their own costs and privacy settings. Keep the original files, index configuration, source labels and retrieval checks. Verify a small set of expected results again if you move stores or change how vectors are produced.

What would tell you that a fictional search still works after a move?

Draw one public sample instruction, a similar internal note and an unrelated public page.

  1. Write the expected search result
    The authorized public user sees the public instruction and its source.
  2. Change one component in the sketch
    Swap the store and mark which filters and expected results need to be checked again.