cleanup

docs/ver2/V2 Python Pydantic Models.md

@@ -1,6 +1,6 @@
 # SQLModel Table Models
 
-Each V2 table is represented by one `SQLModel` class. Because `SQLModel` is built on Pydantic and SQLAlchemy, these classes provide application validation and PostgreSQL mappings without parallel row and create models.
+These models implement the canonical [Version 2 database schema](../schema_v2.md). Each schema entity is represented by exactly one `SQLModel` table class. Because `SQLModel` is built on Pydantic and SQLAlchemy, these classes provide application validation and PostgreSQL mappings without parallel row and create models.
 
 Database-generated UUIDs and timestamps are `None` until PostgreSQL supplies their values during insert. The database columns remain non-nullable. `Person.metadata_` maps to the `metadata` column because `metadata` is reserved by SQLAlchemy's declarative API.
 
@@ -405,4 +405,12 @@ The enum annotations validate application values while the mapped columns retain
 
 `ai_metadata`, `raw_api_response`, and `metadata_` accept any JSON value supported by `JSONB`. Validate provider-specific payload structure before assigning it to these fields, while preserving the complete raw response in `raw_api_response`.
 
-Relationships use `lazy="raise"` to prevent implicit database I/O in async code. Queries must explicitly load relationships they need, for example with `selectinload()`.
+Relationships use `lazy="raise"` to prevent implicit database I/O in async code. Queries must explicitly load relationships they need, for example with `selectinload()`.
+
+The schema's behavioral invariants are enforced outside the table shape where appropriate:
+
+- `PersonRole`, `JobStatus`, and `JobSourceStatus` define the exact values listed by the schema.
+- `unique_document_person_role` enforces role uniqueness for `(document_id, person_id, role)`.
+- Services order document sources by `Source.document_id` and `Source.page_number`.
+- Services derive aggregate `Job.status` from related `JobSource.status` values.
+- Services preserve `JobSource.raw_transcription` and `JobSource.raw_api_response` as point-in-time outputs while updating the active text on `Source`.