# Sources Page Contract

## Purpose

Sources manages individual archived page/file records. It provides source-media viewing, current processing context, provider evidence inspection, previous/next page navigation, and human revision without allowing machine output to be edited.

## Routes

| Route | Purpose |
| --- | --- |
| `/sources` | Document-filtered or Job-filtered Source list; global route redirects to Documents. |
| `/sources/{source_id}` | View media, transcription, revision, metadata, and evidence. |
| `/sources/{source_id}/delete` | Confirm or block deletion. |

The list accepts optional `document_id` and `job_id` query parameters. Document context takes precedence if both parse successfully.

## List Behavior

- The global `/sources` route redirects to `/documents`.
- Filtered list titles are **Sources for Document** and **Sources for Job**.
- Filtered context provides **Back to Document** or **Back to Job**.
- Rows are ordered by page number and then upload name.
- Columns are Upload Title, Page Number, Document Name, Status, and Error Detail.
- Document Name, Upload Title, and Error Detail are left-aligned; Status is centered.
- Status labels are presented in uppercase for consistency with Jobs.
- Stored Filename is intentionally absent from the list.
- Selecting a row opens Source Detail.
- No records displays `No source asset records found in repository.`

## Detail Behavior

- The heading shows page number, upload name, and Source ID.
- **Back to Document** returns to Document Detail for the active source page.
- **Retranscribe Source** opens Create Processing Job with this Source and its Document locked.
- **Delete Source** opens the guarded delete route.
- Previous and Next navigate only among Sources belonging to the same Document in page order; unavailable boundary actions are disabled.
- The media viewer resolves the stored Source path through the configured upload root.
- The top layout is adaptive:
  - Standard pages use three columns with a wider Editable Revision column than the image column.
  - Wide+narrow landscape images switch to a stacked left layout (image above Editable Revision) with metadata on the right.
- Editable Revision is seeded from an existing revision or the preferred machine transcription.
- Source Metadata shows upload name, stored filename, page number, Document Name, Document ID, and stored path. Source ID appears in the page-header subtitle.
- SourceJob Metadata shows latest status (uppercase display), Job ID, execution time, provider, model, prompt, and failure detail.
- Revision Logistics shows revised state, last-revised time, and upload time.
- Candidate Machine Transcriptions appears below the image/revision area, remains compact until expanded, then compares it with the preferred
  machine result and requires confirmation before **Use this transcription**.
- Candidate promotion does not alter a human revision. Empty states distinguish no machine result from no candidates.
- An orientation-normalized artifact appears in evidence only when recognized metadata required a physical rotation.

## Provider Evidence

- Provider Evidence is associated with the latest JobSource execution.
- New attempts display separate expandable Request Manifest, Transport Response, OpenRouter SDK Response Snapshot,
  Normalized Metadata, Software Context, and Derived Artifacts sections.
- Historical `raw_api_response` values are labeled as OpenRouter SDK response snapshots.
- Missing evidence has an explicit empty state.
- Historical executions explicitly state that exact transport evidence was not captured.
- Quality warning artifacts remain attached to their machine attempt and are not recomputed during page rendering.
- **Export Evidence** downloads a versioned package containing source identity, attempts, artifacts, relationships,
  schema versions, and integrity digests without source binaries, credentials, or machine-local source paths.

## Revision Behavior

- Machine transcription is never edited directly.
- A revision must contain non-whitespace text.
- Save persists revised text and updates the saved timestamp without leaving the page.
- Reset restores the in-memory revision from page load or the most recent successful save. When no revision exists, it restores the machine transcription; it does not re-read the database.
- A failed latest execution displays guidance that a human revision can preserve corrected text.

## Delete Behavior

- Deletion is allowed only when the Source has no JobSource links.
- A linked Source shows cleanup guidance and navigation to Jobs.
- An unlinked Source requires explicit permanent deletion.
- Success returns to the Sources list.

## Acceptance Checklist

- Global, Document-filtered, and Job-filtered lists show the correct context and return action.
- List columns and alignments match this contract and omit Stored Filename.
- Previous/next navigation never crosses Document boundaries.
- Detail keeps machine output read-only and human revision separately editable.
- Retranscription, candidate comparison, warnings, and explicit promotion preserve every prior attempt.
- Empty, failed, and missing-evidence states remain explicit.
- JSON evidence is readable without being mislabeled as native transport evidence.
- Delete cannot remove a Source with processing-history links.

## Implementation Anchors

- `src/transcription/ui/pages/sources_page.py`
- `src/transcription/ui/components/table/sources.py`
- `src/transcription/services/sources.py`
- `tests/ui/test_sources_page.py`
- `tests/services/test_transcription_service.py`
- `tests/services/test_v2_crud.py`

## Planned Changes

- Source page reordering remains deferred unless a demonstrated workflow need emerges.