added revisions to transcription table

src/transcription/models.py

@@ -1,16 +1,16 @@
 """SQLModel domain models for the transcription system.
 
 Three models capture the MVP lifecycle:
-  Document  ->  one-to-many  ->  Job  ->  one-to-one  ->  Transcript
+    Document  ->  one-to-many  ->  Job  ->  one-to-many  ->  Transcript
 """
 
 from datetime import UTC
 from datetime import datetime
 from enum import StrEnum
-from typing import Optional
 from uuid import UUID
 from uuid import uuid4
 
+from sqlalchemy import UniqueConstraint
 from sqlmodel import Field
 from sqlmodel import Relationship
 from sqlmodel import SQLModel
@@ -47,7 +47,7 @@ class Job(SQLModel, table=True):
 
     # --- relationships ---
     document: Document = Relationship(back_populates="jobs")
-    transcript: Optional["Transcript"] = Relationship(back_populates="job")
+    transcripts: list["Transcript"] = Relationship(back_populates="job")
 
     @property
     def filename(self) -> str:
@@ -59,8 +59,10 @@ class Transcript(SQLModel, table=True):
     """The output of a transcription job."""
 
     id: UUID = Field(default_factory=uuid4, primary_key=True)
-    job_id: UUID = Field(foreign_key="job.id", unique=True)
-    """ID for the associated job. There's a 1-1 relationship bewteen transcripts and jobs."""
+    job_id: UUID = Field(foreign_key="job.id")
+    """ID for the associated job."""
+    revision: int = Field(default=0, ge=0)
+    """Revision number for this job's transcript history, starting at 0."""
     provider: str
     """Name of the transcription provider used to generate this transcript."""
     prompt_name: str
@@ -71,5 +73,7 @@ class Transcript(SQLModel, table=True):
     """Details of any error that occurred during transcription."""
     created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
 
+    __table_args__ = (UniqueConstraint("job_id", "revision", name="uq_transcript_job_revision"),)
+
     # --- relationships ---
-    job: Job = Relationship(back_populates="transcript")
+    job: Job = Relationship(back_populates="transcripts")

src/transcription/services/transcription.py

@@ -4,10 +4,12 @@ from __future__ import annotations
 
 import logging
 import mimetypes
+from collections.abc import Sequence
 from contextlib import contextmanager
 from pathlib import Path
 from uuid import UUID
 
+from sqlalchemy import func
 from sqlalchemy.ext.asyncio import async_sessionmaker
 from sqlalchemy.orm import selectinload
 from sqlmodel import select
@@ -108,38 +110,76 @@ class TranscriptionService(ServiceBase):
             settings=self.settings,
             provider=self.provider,
         )
-        await self.create_transcript(transcript=result.to_transcript(job_id=job_id), session=session)
+        await self.create_transcript_for_job(
+            job_id=job_id,
+            text=result.text,
+            provider=result.provider,
+            prompt_name=result.prompt_name,
+            session=session,
+        )
 
-    async def upsert_transcript_by_job(
+    async def create_transcript_for_job(
         self,
         *,
         job_id: UUID,
         text: str | None,
-        error_detail: str | None,
+        error_detail: str | None = None,
         provider: str | None = None,
         prompt_name: str = DEFAULT_PROMPT_FILE,
         session: AsyncSession | None = None,
     ) -> Transcript:
-        """Create or update a transcript for a job id."""
+        """Create a new transcript revision for a job id."""
         async with self._session_scope(session) as _session:
-            transcript = (await _session.exec(select(Transcript).where(Transcript.job_id == job_id))).first()
-            if transcript is None:
-                transcript = Transcript(
-                    job_id=job_id,
-                    provider=provider or self.settings.provider.value,
-                    prompt_name=prompt_name,
-                )
-
-            transcript.text = text
-            transcript.error_detail = error_detail
-            if provider is not None:
-                transcript.provider = provider
-            transcript.prompt_name = prompt_name
+            rev_query = select(func.max(Transcript.revision)).where(Transcript.job_id == job_id)
+            rev_result = await _session.exec(rev_query)
+            max_revision = -1 if (rev := rev_result.one_or_none()) is None else rev
+            next_revision = max_revision + 1
 
+            transcript = Transcript(
+                job_id=job_id,
+                revision=next_revision,
+                provider=provider or self.settings.provider.value,
+                prompt_name=prompt_name,
+                text=text,
+                error_detail=error_detail,
+            )
             _session.add(transcript)
             await self._finalize(session=_session, caller_session=session, refresh=(transcript,))
             return transcript
 
+    async def read_latest_transcript_by_job(
+        self,
+        job_id: UUID,
+        *,
+        session: AsyncSession | None = None,
+    ) -> Transcript | None:
+        """Read the latest transcript revision for a job id."""
+        async with self._session_scope(session) as _session:
+            query = _transcript_job_query(job_id=job_id).limit(1)
+            result = await _session.exec(query)
+            return result.one_or_none()
+
+    async def list_transcripts_by_job(
+        self,
+        job_id: UUID,
+        *,
+        session: AsyncSession | None = None,
+    ) -> Sequence[Transcript]:
+        """List transcript revisions for a job id in ascending revision order."""
+        async with self._session_scope(session) as _session:
+            query = _transcript_job_query(job_id=job_id)
+            result = await _session.exec(query)
+            return result.all()
+
+
+def _transcript_job_query(job_id: UUID):
+    return (
+        select(Transcript)
+        .where(Transcript.job_id == job_id)
+        .options(selectinload(Transcript.job))  # pyright: ignore[reportArgumentType]
+        .order_by(Transcript.revision)  # pyright: ignore[reportArgumentType]
+    )  # fmt: skip
+
 
 async def transcribe_document_image(
     image_path: str | Path,

src/transcription/services/workflows.py

@@ -121,7 +121,7 @@ async def _finalize_transcribed(
     """Transaction B: transcript + TRANSCRIBED in one commit."""
     if session is None:
         async with services.jobs._session_scope() as local_session:
-            await services.transcriptions.upsert_transcript_by_job(
+            await services.transcriptions.create_transcript_for_job(
                 job_id=job.id,
                 text=result.text,
                 error_detail=None,
@@ -137,7 +137,7 @@ async def _finalize_transcribed(
             await local_session.commit()
             return updated_job
 
-    await services.transcriptions.upsert_transcript_by_job(
+    await services.transcriptions.create_transcript_for_job(
         job_id=job.id,
         text=result.text,
         error_detail=None,
@@ -165,7 +165,7 @@ async def _finalize_retry(
     """Transaction C: transcript error + QUEUED + retry increment in one commit."""
     if session is None:
         async with services.jobs._session_scope() as local_session:
-            await services.transcriptions.upsert_transcript_by_job(
+            await services.transcriptions.create_transcript_for_job(
                 job_id=job.id,
                 text=None,
                 error_detail=format_error_detail(error),
@@ -180,7 +180,7 @@ async def _finalize_retry(
             )
             await local_session.commit()
     else:
-        await services.transcriptions.upsert_transcript_by_job(
+        await services.transcriptions.create_transcript_for_job(
             job_id=job.id,
             text=None,
             error_detail=format_error_detail(error),
@@ -210,7 +210,7 @@ async def _finalize_failed(
     """Transaction B: transcript error + FAILED in one commit."""
     if session is None:
         async with services.jobs._session_scope() as local_session:
-            await services.transcriptions.upsert_transcript_by_job(
+            await services.transcriptions.create_transcript_for_job(
                 job_id=job.id,
                 text=None,
                 error_detail=format_error_detail(error),
@@ -225,7 +225,7 @@ async def _finalize_failed(
             await local_session.commit()
             return updated_job
 
-    await services.transcriptions.upsert_transcript_by_job(
+    await services.transcriptions.create_transcript_for_job(
         job_id=job.id,
         text=None,
         error_detail=format_error_detail(error),

src/transcription/ui/components/job_detail.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from collections.abc import Sequence
+
 from nicegui import ui
 
 from transcription.models import Document
@@ -40,34 +42,36 @@ def _render_document_section(document: Document) -> None:
         render_document_panzoom(document=document)
 
 
-def _render_transcript_section(transcript: Transcript | None) -> None:
+def _render_transcript_section(transcripts: Sequence[Transcript]) -> None:
     with ui.card().classes("w-full bg-blue-grey-10 text-grey-1 q-pa-md"):
-        ui.label("Transcript").classes("text-subtitle1 text-weight-medium")
+        ui.label("Transcripts").classes("text-subtitle1 text-weight-medium")
         ui.separator().classes("q-my-sm bg-blue-grey-7")
 
-        if transcript is None:
-            ui.label("Transcript not available yet.").classes("text-body2 text-grey-3")
+        if not transcripts:
+            ui.label("Transcript history is not available yet.").classes("text-body2 text-grey-3")
             return
 
-        with ui.column().classes("w-full q-gutter-y-xs"):
-            _metadata_row("Provider", transcript.provider)
-            _metadata_row("Prompt", transcript.prompt_name)
-            _metadata_row("Created", transcript.created_at.isoformat())
+        for transcript in transcripts:
+            with ui.column().classes("w-full q-gutter-y-xs"):
+                _metadata_row("Revision", str(transcript.revision))
+                _metadata_row("Provider", transcript.provider)
+                _metadata_row("Prompt", transcript.prompt_name)
+                _metadata_row("Created", transcript.created_at.isoformat())
 
-        if transcript.text:
-            ui.separator().classes("q-my-sm bg-blue-grey-7")
-            with ui.card().classes("w-full bg-blue-grey-9 text-grey-1 q-pa-sm"):
-                ui.markdown(transcript.text).classes("text-grey-1")
-            return
+            if transcript.text:
+                ui.separator().classes("q-my-sm bg-blue-grey-7")
+                with ui.card().classes("w-full bg-blue-grey-9 text-grey-1 q-pa-sm"):
+                    ui.markdown(transcript.text).classes("text-grey-1")
+            elif transcript.error_detail:
+                ui.separator().classes("q-my-sm bg-blue-grey-7")
+                with ui.card().classes("w-full bg-red-1 text-red-10 q-pa-sm"):
+                    ui.label("Failure detail").classes("text-caption text-uppercase")
+                    ui.label(transcript.error_detail).classes("text-body2")
 
-        if transcript.error_detail:
-            ui.separator().classes("q-my-sm bg-blue-grey-7")
-            with ui.card().classes("w-full bg-red-1 text-red-10 q-pa-sm"):
-                ui.label("Failure detail").classes("text-caption text-uppercase")
-                ui.label(transcript.error_detail).classes("text-body2")
+            ui.separator().classes("q-my-md bg-blue-grey-7")
 
 
-def render_job_detail(*, job: Job, document: Document | None, transcript: Transcript | None) -> None:
+def render_job_detail(*, job: Job, document: Document | None, transcripts: Sequence[Transcript]) -> None:
     """Render all sections for the job detail page."""
     status_text = job.status.value
     with ui.column().classes("w-full max-w-4xl q-gutter-md"):
@@ -92,4 +96,4 @@ def render_job_detail(*, job: Job, document: Document | None, transcript: Transc
         if document is not None:
             _render_document_section(document)
 
-        _render_transcript_section(transcript)
+        _render_transcript_section(transcripts)

src/transcription/ui/pages/jobs_page.py

@@ -4,69 +4,45 @@ from __future__ import annotations
 
 from uuid import UUID
 
+from fastapi import Request
 from nicegui import ui
-from sqlalchemy.orm import selectinload
-from sqlmodel import desc
-from sqlmodel import select
 
-from transcription.db import get_session
-from transcription.models import Document
-from transcription.models import Job
-from transcription.models import Transcript
+from transcription.app_state import resolve_session_factory
+from transcription.services.jobs import JobService
+from transcription.services.transcription import TranscriptionService
 from transcription.ui.components.app_shell import render_navigation_header
 from transcription.ui.components.error_presenter import show_error
 from transcription.ui.components.error_presenter import summarize_error
 from transcription.ui.components.job_detail import render_job_detail
-from transcription.ui.components.table.jobs import JobTableRow
 from transcription.ui.components.table.jobs import render_jobs_table
 
-
-async def fetch_job_rows() -> list[JobTableRow]:
-    """Return jobs for display in most-recent-first order."""
-    async with get_session() as session:
-        jobs = (
-            await session.exec(
-                select(Job)
-                .options(selectinload(Job.document))  # pyright: ignore[reportArgumentType]
-                .order_by(desc(Job.created_at))
-            )
-        ).all()
-        return [
-            JobTableRow(
-                id=job.id,
-                status=job.status.value,
-                filename=job.filename,
-                retry_count=job.retry_count,
-                created_at=job.created_at.isoformat(),
-                updated_at=job.updated_at.isoformat(),
-            )
-            for job in jobs
-        ]
-
-
-async def fetch_job_detail(job_id: UUID) -> tuple[Job | None, Document | None, Transcript | None]:
-    """Return job, document, and transcript for detail view."""
-    async with get_session() as session:
-        job = await session.get(Job, job_id)
-        if job is None:
-            return None, None, None
-        document = await session.get(Document, job.document_id)
-        transcript = (await session.exec(select(Transcript).where(Transcript.job_id == job.id))).first()
-        return job, document, transcript
+from ..components.table.jobs import JobTableRow
 
 
 def register_page() -> None:
     """Register jobs list and detail routes."""
 
     @ui.page("/jobs")
-    async def jobs_page() -> None:
+    async def jobs_page(request: Request) -> None:
+        session_factory = resolve_session_factory(request.app.state)
+        jobs_service = JobService(session_factory=session_factory)
         render_navigation_header(current_path="/jobs")
         ui.label("Transcription Jobs")
         status = ui.label("Ready")
 
         @ui.refreshable
         async def render_table() -> None:
-            jobs = await fetch_job_rows()
+            jobs = [
+                JobTableRow(
+                    id=job.id,
+                    status=job.status.value,
+                    filename=job.filename,
+                    retry_count=job.retry_count,
+                    created_at=job.created_at.isoformat(),
+                    updated_at=job.updated_at.isoformat(),
+                )
+                for job in await jobs_service.list_jobs()
+            ]
             render_jobs_table(jobs)
 
         async def refresh() -> None:
@@ -83,7 +59,10 @@ def register_page() -> None:
         ui.link("Back to upload", "/upload")
 
     @ui.page("/jobs/{job_id}")
-    async def job_detail_page(job_id: str) -> None:
+    async def job_detail_page(job_id: str, request: Request) -> None:
+        session_factory = resolve_session_factory(request.app.state)
+        jobs_service = JobService(session_factory=session_factory)
+        transcription_service = TranscriptionService(session_factory=session_factory)
         render_navigation_header(current_path="/jobs")
         ui.label("Job Detail")
         try:
@@ -93,12 +72,14 @@ def register_page() -> None:
             ui.link("Back to jobs", "/jobs")
             return
 
-        job, document, transcript = await fetch_job_detail(parsed_id)
-        if job is None:
+        try:
+            job = await jobs_service.read_job(job_id=parsed_id)
+        except ValueError:
             ui.label("Job not found")
             ui.link("Back to jobs", "/jobs")
             return
 
-        render_job_detail(job=job, document=document, transcript=transcript)
+        transcripts = list(await transcription_service.list_transcripts_by_job(parsed_id))
+        render_job_detail(job=job, document=job.document, transcripts=transcripts)
 
         ui.link("Back to jobs", "/jobs")