transcription/docs/ver4/schema_v4.md

Database Schema (Version 4)

This document defines the relational schema for the document transcription system.

Entity Relationship Diagram

erDiagram
DOCUMENT_TYPE {
UUID id PK
TEXT label
TEXT normalized_label
BOOLEAN is_active
TIMESTAMPTZ created_at
TIMESTAMPTZ updated_at
}

PERSON_ROLE {
UUID id PK
TEXT code
TEXT label
BOOLEAN is_active
TIMESTAMPTZ created_at
TIMESTAMPTZ updated_at
}

PERSON {
UUID id PK
TEXT full_name
TEXT display_name
TEXT maiden_name
DATE birth_date
TEXT birth_date_raw
TEXT birth_place
DATE death_date
TEXT death_date_raw
TEXT death_place
TEXT biography
TEXT portrait_path
JSONB metadata
TIMESTAMPTZ created_at
TIMESTAMPTZ updated_at
}

DOCUMENT {
UUID id PK
UUID document_type_id FK
TEXT name
DATE document_date
TEXT document_date_raw
TEXT location_created
TEXT notes
TEXT archive_identifier
TIMESTAMPTZ created_at
TIMESTAMPTZ updated_at
}

DOCUMENT_PERSON {
UUID id PK
UUID document_id FK
UUID person_id FK
UUID role_id FK
TIMESTAMPTZ created_at
TIMESTAMPTZ updated_at
}

JOB {
UUID id PK
UUID document_id FK
VARCHAR status
INTEGER retry_count
TEXT provider
TEXT model
TEXT prompt_name
TEXT prompt_hash
TEXT system_prompt
TEXT user_prompt
FLOAT temperature
FLOAT top_p
TIMESTAMPTZ date_created
TIMESTAMPTZ date_updated
}

SOURCE {
UUID id PK
UUID document_id FK
INTEGER page_number
TEXT upload_name
TEXT filename
TEXT file_path
TEXT file_hash
BIGINT file_size_bytes
TEXT raw_transcription
TEXT revised_text
TIMESTAMPTZ date_uploaded
TIMESTAMPTZ date_revised
}

JOB_SOURCE {
UUID id PK
UUID job_id FK
UUID source_id FK
VARCHAR status
TEXT raw_transcription
JSONB ai_metadata
JSONB raw_api_response
TEXT error_detail
TIMESTAMPTZ executed_at
}

EXECUTION_ATTEMPT {
UUID id PK
UUID job_source_id FK
UUID job_id FK
UUID source_id FK
INTEGER attempt_number
VARCHAR status
JSONB request_manifest
TEXT request_manifest_sha256
INTEGER transport_status_code
BINARY transport_body
JSONB transport_safe_headers
JSONB sdk_response_snapshot
JSONB normalized_metadata
JSONB software_context
TEXT raw_transcription
TEXT failure_phase
TIMESTAMPTZ started_at
TIMESTAMPTZ finished_at
INTEGER duration_ms
}

PROCESSING_ARTIFACT {
UUID id PK
UUID source_id FK
UUID execution_attempt_id FK
TEXT artifact_type
TEXT media_type
TEXT schema_name
TEXT schema_version
TEXT producer
TEXT producer_version
JSONB inline_payload
TEXT external_reference
TEXT payload_sha256
BIGINT byte_size
JSONB coordinate_metadata
TIMESTAMPTZ created_at
}

DOCUMENT_TYPE ||--o{ DOCUMENT : classifies
DOCUMENT ||--o{ DOCUMENT_PERSON : has_people
PERSON ||--o{ DOCUMENT_PERSON : appears_in
PERSON_ROLE ||--o{ DOCUMENT_PERSON : labels
DOCUMENT ||--o{ JOB : has_jobs
DOCUMENT ||--o{ SOURCE : contains_pages
JOB ||--o{ JOB_SOURCE : executes
SOURCE ||--o{ JOB_SOURCE : processed_in
JOB_SOURCE ||--o{ EXECUTION_ATTEMPT : projects
SOURCE ||--o{ PROCESSING_ARTIFACT : derives
EXECUTION_ATTEMPT ||--o{ PROCESSING_ARTIFACT : produces

Domain Invariants and Provenance Rules

Page-Level Execution and AI Outputs

• Every single page execution by an AI model produces a dedicated JOB_SOURCE record.
• Every JOB stores the frozen prompt identifier, prompt text, and hyperparameters used at submission time.
• JOB_SOURCE.raw_api_response is a compatibility projection containing an SDK-serialized OpenRouter response snapshot. It is neither the exact HTTP body nor the native upstream-provider response.
• Every new provider call creates an immutable EXECUTION_ATTEMPT containing the frozen request manifest, exact OpenRouter-boundary response bytes when received, safe transport metadata, SDK snapshot, normalized metadata, timing, and outcome.
• EXECUTION_ATTEMPT(job_id, source_id, attempt_number) is unique; retries increment the persisted attempt number.
• Historical JOB_SOURCE rows without an EXECUTION_ATTEMPT remain SDK snapshots and are explicitly labeled as lacking transport evidence.
• SOURCE.raw_transcription caches the latest successful machine output for that page.

Generic Processing Artifacts

• PROCESSING_ARTIFACT stores provider-neutral versioned derived outputs.
• Exactly one of inline_payload and external_reference is populated.
• Externally stored artifacts use application-managed relative references and are verified by SHA-256 and byte size.
• Coordinate metadata declares units, origin, dimensions, and transformations when geometry is present.

Image Storage and Integrity

• Binary images are stored on disk; SOURCE.file_path stores the persisted path.
• SOURCE.file_hash stores a SHA-256 digest.
• SOURCE.file_size_bytes stores the original file size.

Page Ordering and Revisions

• SOURCE.page_number dictates page ordering within a document.
• SOURCE.raw_transcription remains immutable machine output.
• SOURCE.revised_text stores human edits and is the preferred display value when present.

Document-Person Role Governance

• Documents support zero, one, or many people per relationship role.
• Relationship roles are defined by PERSON_ROLE rather than hardcoded columns.
• DOCUMENT_PERSON must be unique for (document_id, person_id, role_id).
• Relationship writes must be deterministic and use explicit add/remove link intent.

Document Type Governance

• Every document type is defined by DOCUMENT_TYPE.
• DOCUMENT_TYPE.id is the sole machine identity.
• DOCUMENT_TYPE.label is mutable display text and is unique after trimming and case normalization.
• DOCUMENT_TYPE.normalized_label stores the normalized uniqueness key.
• Inactive types remain valid for historical rows but should be excluded from default selection UIs.

Constraint Summary

• DOCUMENT_TYPE.normalized_label is unique.
• PERSON_ROLE.code is unique.
• DOCUMENT_PERSON(document_id, person_id, role_id) is unique.

Indexing Guidance

• document(document_type_id)
• document_person(document_id)
• document_person(person_id)
• document_person(role_id)
• source(document_id, page_number)
• job(document_id, status)
• job_source(job_id)
• job_source(source_id)

Related Local References

• System Overview
• System Architecture
• System Requirements
• Error Handling Policy