Persistence

SQLite + Chroma persistence for transcripts, topic trees, and topic embeddings:

• autorag.db — SQLite handle and AudioClip row schema via pydantic_sqlite.

• autorag.persistence — topic-tree serialization, session-id derivation, base-safe transcript readers.

• autorag.chroma_store — persistent Chroma collection for topic embeddings, used by the /viz page.

• autorag.db
• autorag.persistence
• autorag.chroma_store