Store an uploaded doctor report / discharge letter and stage extracted
structured facts for review. Two models:
- InboundDocument: the uploaded document, raw bytes encrypted at rest via
the shared AES-256-GCM Bytes codec (content_encrypted), with queryable
metadata (kind, mime, size, status, report date).
- ExtractedFact: the review-then-confirm staging row — fact type, status,
per-field provenance, a confidence score, and a needs-review gate, plus
the FHIR-staged payload (stated codes/status only) as JSONB.
Wire content_encrypted into the encryption-key rotation registry and the
rotation script so a key drop never strands a stored document.
