Metadata and filtered retrieval

Metadata turns semantic search into scoped semantic search. Filtering by source, type, or date removes whole classes of wrong answer.

What this lesson covers

• Attach source, type, and timestamp to every chunk
• Filter before ranking to cut the candidate set
• Use metadata to attribute answers back to a source

This lesson sits in Ingestion and Indexing, part of Retrieval-Augmented Generation from Scratch. It assumes what came before it and leads directly into the next lesson in the module.