> ## Documentation Index
> Fetch the complete documentation index at: https://project-brain.rocheaiops.net/llms.txt
> Use this file to discover all available pages before exploring further.

# Canonical state

> What must survive a provider change and what can be rebuilt.

## Canonical where implemented

Structured sessions, events, learning records, authority, confidence, status, evidence references, predecessor links, document metadata, source checksums, immutable originals, normalized document artifacts, durable job/audit state, migrations, policy definitions, and evidence records are canonical within their respective stores.

## Derived and rebuildable

Embeddings, chunk/vector index state, caches, temporary provider state, and presentation views are derived. The provider/model/dimension metadata needed to rebuild a compatible index is retained. A vector must never be the only copy of knowledge.

Git owns source, migrations, configuration templates, tests, and project documentation. PostgreSQL and portable artifacts own runtime cognitive/source data. See [storage](/architecture/storage).