From c9e02f666d65d73cd27cdb69cfb92c52dde9ce47 Mon Sep 17 00:00:00 2001
From: kevin314 <kevin.lin.cs1@gmail.com>
Date: Fri, 23 Oct 2026 09:27:21 +0000
Subject: [PATCH] Add reference image previews

---
 apps/fastvideo_studio/mock_server.py          | 103 ++++++++++++++++--
 apps/fastvideo_studio/reference_preview.py    |  28 +++++
 apps/fastvideo_studio/server.py               |  10 ++
 .../components/jobs/CreateJobModal.test.tsx   |  45 +++++++-
 .../src/components/jobs/CreateJobModal.tsx    |  27 ++++-
 .../components/jobs/ReferenceThumbnail.tsx    |  35 ++++++
 apps/fastvideo_studio/src/lib/api.ts          |   5 +
 .../tests/test_mock_server_jobs.py            |  56 ++++++++++
 8 files changed, 300 insertions(+), 9 deletions(-)
 create mode 100644 apps/fastvideo_studio/reference_preview.py
 create mode 100644 apps/fastvideo_studio/src/components/jobs/ReferenceThumbnail.tsx

diff --git a/apps/fastvideo_studio/mock_server.py b/apps/fastvideo_studio/mock_server.py
index 02402202f..a6989c556 100644
--- a/apps/fastvideo_studio/mock_server.py
+++ b/apps/fastvideo_studio/mock_server.py
@@ -20,10 +20,17 @@ snapshot taken once at startup: nothing created or changed while the mock
 runs is ever written back to that database, so it's safe to point at the
 same ``--data-dir`` a real ``server.py`` is using.
 
+Pass ``--state-file`` to keep the mock's own job changes across restarts:
+after every job create/edit/queue/delete the mock writes the jobs it created
+or changed (and the snapshot jobs it deleted) to that JSON file, and applies
+it on top of the snapshot at the next startup. The SQLite database is still
+never written; delete the file to reset the mock.
+
 Usage (from the ``apps/`` directory)::
 
     PYTHONPATH=.. python -m fastvideo_studio.mock_server --port 8190
-    PYTHONPATH=.. python -m fastvideo_studio.mock_server --port 8190 --data-dir ../outputs/ui_data
+    PYTHONPATH=.. python -m fastvideo_studio.mock_server --port 8190 --data-dir ../outputs/ui_data \
+        --state-file ../outputs/ui_data/mock_state.json
 """
 
 from __future__ import annotations
@@ -51,12 +58,12 @@ from fastapi.responses import FileResponse, PlainTextResponse
 from fastvideo_studio.database import Database, default_settings_dict
 from fastvideo_studio.job_queue import circular_dependency, dependencies, plan_dispatch
 from fastvideo_studio.merge import MergeError, merge_jobs, merged_path
+from fastvideo_studio.reference_preview import reference_image_response
 from fastvideo_studio.scene_writer.routes import router as scene_writer_router
 from fastvideo_studio.scene_writer.runner import use_server_data_dir
 from fastvideo_studio.trim import BRIGHTNESS_RANGE, CONTRAST_RANGE, SATURATION_RANGE
 from fastvideo_studio.models import (CreateDatasetRequest, CreateJobRequest, GradeSegment, MergeSceneRequest,
-                                     QueueJobsRequest, SettingsUpdate, TrimRequest, UpdateCaptionRequest,
-                                     model_label)
+                                     QueueJobsRequest, SettingsUpdate, TrimRequest, UpdateCaptionRequest, model_label)
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(name)s: %(message)s")
 logger = logging.getLogger("fastvideo.studio.mock")
@@ -122,6 +129,9 @@ _jobs: dict[str, dict[str, Any]] = {}
 _datasets: dict[str, dict[str, Any]] = {}
 # dataset_id -> {"file_names": [...], "captions": {file_name: caption}}
 _dataset_files: dict[str, dict[str, Any]] = {}
+# Each snapshot job as loaded, so --state-file saves only what the mock changed.
+_snapshot_originals: dict[str, dict[str, Any]] = {}
+_state_file: Path | None = None
 
 # Lazily-built, cached media clips (shared by every job/dataset media response),
 # keyed by extension: "mp4" (1s testsrc video) or "png" (single testsrc frame).
@@ -161,7 +171,7 @@ def _build_mock_media_with_pyav(kind: str, path: str) -> None:
         codec_name = "h264"
     except Exception:
         logger.warning("PyAV has no h264 encoder available; falling back to mpeg4, which most "
-                        "browsers cannot play in <video>. Install ffmpeg for real preview playback.")
+                       "browsers cannot play in <video>. Install ffmpeg for real preview playback.")
         codec_name = "mpeg4"
 
     container = pyav.open(path, mode="w")
@@ -194,7 +204,8 @@ def _build_mock_media(kind: str) -> str:
             except Exception as exc:
                 with contextlib.suppress(OSError):
                     os.remove(path)
-                raise HTTPException(status_code=500, detail=f"PyAV fallback failed to build mock {kind}: {exc}") from exc
+                raise HTTPException(status_code=500,
+                                    detail=f"PyAV fallback failed to build mock {kind}: {exc}") from exc
             if not os.path.isfile(path) or os.path.getsize(path) == 0:
                 raise HTTPException(status_code=500, detail=f"PyAV fallback produced no mock {kind} bytes")
             _mock_media_cache[kind] = path
@@ -511,6 +522,8 @@ def _load_snapshot_from_db(data_dir: Path) -> bool:
         _settings.update({k: v for k, v in settings.items() if v is not None})
         _jobs.clear()
         _jobs.update({j["id"]: j for j in jobs})
+        _snapshot_originals.clear()
+        _snapshot_originals.update({j["id"]: copy.deepcopy(j) for j in jobs})
         _datasets.clear()
         _datasets.update({d["id"]: d for d in datasets})
         _dataset_files.clear()
@@ -527,6 +540,45 @@ def _load_snapshot_from_db(data_dir: Path) -> bool:
     return True
 
 
+# --- Saved mock state (--state-file) -----------------------------------------
+
+
+def _save_state() -> None:
+    """Write the jobs the mock created or changed to _state_file. Lock held.
+
+    Snapshot jobs left as loaded are not saved, so later changes to the real
+    database still show through; deleted snapshot jobs are listed by id.
+    """
+    if _state_file is None:
+        return
+    jobs = [j for jid, j in _jobs.items() if _snapshot_originals.get(jid) != j]
+    deleted = [jid for jid in _snapshot_originals if jid not in _jobs]
+    tmp = _state_file.with_name(_state_file.name + ".tmp")
+    try:
+        tmp.write_text(json.dumps({"jobs": jobs, "deleted_job_ids": deleted}, indent=1))
+        os.replace(tmp, _state_file)
+    except (OSError, TypeError, ValueError):
+        logger.exception("Could not save mock state to %s", _state_file)
+
+
+def _load_state(path: Path) -> None:
+    """Apply a saved --state-file on top of whatever was seeded or snapshotted."""
+    if not path.is_file():
+        logger.info("No mock state at %s yet; it will be created on the first job change.", path)
+        return
+    try:
+        state = json.loads(path.read_text())
+    except (OSError, ValueError):
+        logger.exception("Could not read mock state from %s; starting without it.", path)
+        return
+    with _state_lock:
+        for job_id in state.get("deleted_job_ids", []):
+            _jobs.pop(job_id, None)
+        for job in state.get("jobs", []):
+            _jobs[job["id"]] = job
+    logger.info("Loaded %d saved job(s) from %s.", len(state.get("jobs", [])), path)
+
+
 # --- App --------------------------------------------------------------------
 
 app = FastAPI(title="FastVideo Studio Mock API", version="0.1.0")
@@ -542,6 +594,15 @@ app.add_middleware(
 app.include_router(scene_writer_router)
 
 
+@app.middleware("http")
+async def save_state_after_job_changes(request, call_next):
+    response = await call_next(request)
+    if _state_file is not None and request.method != "GET" and request.url.path.startswith("/api/jobs"):
+        with _state_lock:
+            _save_state()
+    return response
+
+
 @app.get("/api/__mock__")
 def mock_sentinel() -> dict[str, bool]:
     """Mock-only marker so the e2e suite can prove it isn't hitting a real
@@ -939,8 +1000,16 @@ def _enqueue(job_ids: list[str]) -> list[dict[str, Any]]:
             )
     for job in jobs:
         job.pop(_FROM_SNAPSHOT_KEY, None)
-        job.update(status="queued", queued_at=time.time(), error=None, output_path=None, log_file_path=None,
-                   started_at=None, finished_at=None, progress=0.0, progress_msg="", phase="queued")
+        job.update(status="queued",
+                   queued_at=time.time(),
+                   error=None,
+                   output_path=None,
+                   log_file_path=None,
+                   started_at=None,
+                   finished_at=None,
+                   progress=0.0,
+                   progress_msg="",
+                   phase="queued")
         # Strictly increasing, so jobs queued together keep their order.
         others = [j["queued_at"] for j in _jobs.values() if j.get("queued_at") and j is not job]
         job["queued_at"] = max([job["queued_at"], *[o + 1e-6 for o in others]])
@@ -1065,6 +1134,16 @@ def get_video(job_id: str) -> FileResponse:
     return FileResponse(_build_mock_media("mp4"), media_type="video/mp4", filename=f"job_{job_id}.mp4")
 
 
+@app.get("/api/jobs/{job_id}/reference")
+def get_reference_image(job_id: str, source: str) -> FileResponse:
+    with _state_lock:
+        job = _jobs.get(job_id)
+        if job is None:
+            raise HTTPException(status_code=404, detail="Job not found")
+        references = list(job.get("references") or [])
+    return reference_image_response(references, source)
+
+
 _MERGED_DIR = tempfile.mkdtemp(prefix="fvstudio_merged_")
 
 
@@ -1199,6 +1278,7 @@ def delete_dataset(dataset_id: str) -> dict[str, str]:
 
 
 def main() -> None:
+    global _state_file
     import argparse
 
     import uvicorn
@@ -1214,12 +1294,21 @@ def main() -> None:
               "fastvideo_ui.db under this directory (its --data-dir) instead "
               "of fake demo data. Nothing the mock does is written back."),
     )
+    parser.add_argument(
+        "--state-file",
+        default=None,
+        help=("JSON file that keeps jobs created or changed in the mock across "
+              "restarts (applied on top of --data-dir). Delete it to reset."),
+    )
     args = parser.parse_args()
 
     if args.data_dir is None or not _load_snapshot_from_db(Path(args.data_dir).resolve()):
         _seed()
     if args.data_dir is not None:
         use_server_data_dir(Path(args.data_dir).resolve())
+    if args.state_file:
+        _state_file = Path(args.state_file).resolve()
+        _load_state(_state_file)
 
     uvicorn.run(app, host=args.host, port=args.port, log_level="info")
 
diff --git a/apps/fastvideo_studio/reference_preview.py b/apps/fastvideo_studio/reference_preview.py
new file mode 100644
index 000000000..8cae65e6a
--- /dev/null
+++ b/apps/fastvideo_studio/reference_preview.py
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: Apache-2.0
+"""Serve a job's image reference so the job form can show a thumbnail of it.
+
+Only a file the job itself lists as an image reference is served: the API may
+be reachable from outside (a tunnel), so a path from the request alone never
+opens a file.
+"""
+
+from __future__ import annotations
+
+import mimetypes
+import os
+from typing import Any
+
+from fastapi import HTTPException
+from fastapi.responses import FileResponse
+
+IMAGE_EXTENSIONS = {".png", ".jpg", ".jpeg", ".webp", ".bmp"}
+
+
+def reference_image_response(references: list[dict[str, Any]] | None, source: str) -> FileResponse:
+    listed = any(r.get("source") == source and r.get("media_type") == "image" for r in references or [])
+    ext = os.path.splitext(source)[1].lower()
+    if not listed or ext not in IMAGE_EXTENSIONS:
+        raise HTTPException(status_code=404, detail="No such image reference on this job")
+    if not os.path.isfile(source):
+        raise HTTPException(status_code=404, detail="Reference file not found on disk")
+    return FileResponse(source, media_type=mimetypes.guess_type(source)[0] or "application/octet-stream")
diff --git a/apps/fastvideo_studio/server.py b/apps/fastvideo_studio/server.py
index 71ec5e074..486995fd8 100644
--- a/apps/fastvideo_studio/server.py
+++ b/apps/fastvideo_studio/server.py
@@ -37,6 +37,7 @@ from fastvideo_studio.frames import FrameError, last_clip_for_job, last_frame_fo
 from fastvideo_studio.gpu import get_gpu_snapshot
 from fastvideo_studio.job_runner import JobRunner, JobStatus
 from fastvideo_studio.merge import MergeError, merge_jobs, merged_path
+from fastvideo_studio.reference_preview import reference_image_response
 from fastvideo_studio.scene_writer.routes import router as scene_writer_router
 from fastvideo_studio.scene_writer.runner import use_server_data_dir
 from fastvideo_studio.models import (CreateDatasetRequest, CreateJobRequest, MergeSceneRequest, QueueJobsRequest,
@@ -706,6 +707,15 @@ def get_video(job_id: str) -> FileResponse:
     return FileResponse(job.output_path, media_type=media_type)
 
 
+@app.get("/api/jobs/{job_id}/reference")
+def get_reference_image(job_id: str, source: str) -> FileResponse:
+    """One of the job's image references, for a thumbnail in the job form."""
+    job = job_runner.get_job(job_id)
+    if job is None:
+        raise HTTPException(status_code=404, detail="Job not found")
+    return reference_image_response(job.references, source)
+
+
 @app.post("/api/jobs/{job_id}/last-frame")
 def extract_last_frame(job_id: str) -> dict[str, str]:
     """Save the last frame of a completed job's video and return its path.
diff --git a/apps/fastvideo_studio/src/components/jobs/CreateJobModal.test.tsx b/apps/fastvideo_studio/src/components/jobs/CreateJobModal.test.tsx
index 2b7417a32..d16ce082f 100644
--- a/apps/fastvideo_studio/src/components/jobs/CreateJobModal.test.tsx
+++ b/apps/fastvideo_studio/src/components/jobs/CreateJobModal.test.tsx
@@ -5,7 +5,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 import CreateJobModal from './CreateJobModal';
 import { toast } from 'sonner';
-import { createJob, getDatasets, getModels, uploadImage } from '@/lib/api';
+import { createJob, getDatasets, getModels, uploadImage, uploadMedia } from '@/lib/api';
 import { defaultOptionsStore } from '@/stores/defaultOptions';
 import { DEFAULT_OPTIONS } from '@/lib/defaultOptions';
 
@@ -16,6 +16,9 @@ vi.mock('@/lib/api', () => ({
   getModels: vi.fn(),
   getDatasets: vi.fn(),
   uploadImage: vi.fn(),
+  uploadMedia: vi.fn(),
+  updateJob: vi.fn(),
+  getJobReferenceUrl: (jobId: string, source: string) => `/api/jobs/${jobId}/reference?source=${encodeURIComponent(source)}`,
   getSettings: vi.fn(),
   updateSettings: vi.fn(),
 }));
@@ -385,3 +388,43 @@ describe('CreateJobModal shot list on a raw prompt', () => {
     expect(screen.queryByRole('button', { name: 'Open shot list' })).not.toBeInTheDocument();
   });
 });
+
+describe('CreateJobModal reference previews', () => {
+  beforeEach(() => {
+    vi.mocked(getModels).mockResolvedValue([...MODELS, H3]);
+  });
+
+  const job = {
+    id: 'job-9',
+    model_id: H3.id,
+    name: 'diner-clip-01',
+    prompt: BASE_PROMPT,
+    workload_type: 'i2v',
+    status: 'pending',
+    references: [
+      { source: '/refs/dana.jpg', media_type: 'image' },
+      { source: '/refs/voice.mp3', media_type: 'audio' },
+    ],
+  };
+
+  it("shows a saved job's image references from the server and an icon for other media", async () => {
+    renderModal({ workloadType: 'i2v', editingJob: job as never });
+
+    const thumb = await screen.findByRole('img', { name: 'dana.jpg' });
+    expect(thumb).toHaveAttribute('src', '/api/jobs/job-9/reference?source=%2Frefs%2Fdana.jpg');
+    expect(screen.queryByRole('img', { name: 'voice.mp3' })).not.toBeInTheDocument();
+  });
+
+  it('previews a newly uploaded image from the local file', async () => {
+    const user = userEvent.setup();
+    URL.createObjectURL = vi.fn(() => 'blob:local-preview');
+    URL.revokeObjectURL = vi.fn();
+    vi.mocked(uploadMedia).mockResolvedValue({ path: '/uploads/u1/marcus.jpg', media_type: 'image' });
+    renderModal({ workloadType: 'i2v', editingJob: job as never });
+
+    await screen.findByRole('img', { name: 'dana.jpg' });
+    await user.upload(screen.getByLabelText('References (Ref2VA)'), new File(['x'], 'marcus.jpg', { type: 'image/jpeg' }));
+
+    expect(await screen.findByRole('img', { name: 'marcus.jpg' })).toHaveAttribute('src', 'blob:local-preview');
+  });
+});
diff --git a/apps/fastvideo_studio/src/components/jobs/CreateJobModal.tsx b/apps/fastvideo_studio/src/components/jobs/CreateJobModal.tsx
index bc5afb94a..cac0ded3d 100644
--- a/apps/fastvideo_studio/src/components/jobs/CreateJobModal.tsx
+++ b/apps/fastvideo_studio/src/components/jobs/CreateJobModal.tsx
@@ -24,6 +24,7 @@ import {
   createJob,
   updateJob,
   getDatasets,
+  getJobReferenceUrl,
   getModels,
   uploadImage,
   uploadMedia,
@@ -55,6 +56,7 @@ import { applyH3Tag, type H3Tag } from '@/lib/h3Tags';
 import { H3TagConsole } from '@/components/jobs/H3TagConsole';
 import { H3DialogueEditor } from '@/components/jobs/H3DialogueEditor';
 import { H3ShotListEditor } from '@/components/jobs/H3ShotListEditor';
+import { ReferenceThumbnail } from '@/components/jobs/ReferenceThumbnail';
 import { jobToFormFields, type JobLike } from '@/lib/jobToFields';
 import { readField, shotTarget, writeField, writeShotTarget } from '@/lib/h3PromptFields';
 import { toast } from 'sonner';
@@ -100,6 +102,16 @@ export default function CreateJobModal({
   const [lastImagePath, setLastImagePath] = React.useState('');
   const [references, setReferences] = React.useState<H3Reference[]>([]);
   const [isUploadingReference, setIsUploadingReference] = React.useState(false);
+  // Local previews of references uploaded in this session, by reference id; a saved job's own
+  // references are previewed from the server instead.
+  const [uploadPreviews, setUploadPreviews] = React.useState<Record<string, string>>({});
+  React.useEffect(() => {
+    if (isOpen) return;
+    setUploadPreviews((previews) => {
+      Object.values(previews).forEach((url) => URL.revokeObjectURL(url));
+      return {};
+    });
+  }, [isOpen]);
   const [referenceError, setReferenceError] = React.useState<string | null>(null);
   const [promptFields, setPromptFields] = React.useState<H3PromptFields>(
     EMPTY_H3_PROMPT_FIELDS,
@@ -531,10 +543,15 @@ export default function CreateJobModal({
     setReferenceError(null);
     try {
       const { path, media_type } = await uploadMedia(file);
+      const id = `${Date.now()}-${file.name}`;
+      if (media_type === 'image') {
+        const url = URL.createObjectURL(file);
+        setUploadPreviews((previews) => ({ ...previews, [id]: url }));
+      }
       const next: H3Reference[] = [
         ...references,
         {
-          id: `${Date.now()}-${file.name}`,
+          id,
           source: path,
           media_type,
           fileName: file.name,
@@ -911,6 +928,14 @@ export default function CreateJobModal({
                       key={reference.id}
                       className="flex items-center gap-2 text-xs text-muted-foreground"
                     >
+                      <ReferenceThumbnail
+                        mediaType={reference.media_type}
+                        src={
+                          uploadPreviews[reference.id] ??
+                          (editingJob ? getJobReferenceUrl(editingJob.id, reference.source) : null)
+                        }
+                        alt={reference.fileName}
+                      />
                       <code className="font-mono text-accent-blue">
                         {labelReferences(references)[index]}
                       </code>
diff --git a/apps/fastvideo_studio/src/components/jobs/ReferenceThumbnail.tsx b/apps/fastvideo_studio/src/components/jobs/ReferenceThumbnail.tsx
new file mode 100644
index 000000000..3aa12710b
--- /dev/null
+++ b/apps/fastvideo_studio/src/components/jobs/ReferenceThumbnail.tsx
@@ -0,0 +1,35 @@
+'use client';
+
+import * as React from 'react';
+import { FileAudio, FileVideo, ImageOff } from 'lucide-react';
+
+import type { MediaType } from '@/lib/api';
+
+export interface ReferenceThumbnailProps {
+  mediaType: MediaType;
+  /** where the image can be loaded from; null when it cannot be previewed */
+  src: string | null;
+  alt: string;
+}
+
+/** A small square preview of a reference: the image itself, or an icon for video, audio, or an unreadable image. */
+export function ReferenceThumbnail({ mediaType, src, alt }: ReferenceThumbnailProps) {
+  const [failed, setFailed] = React.useState(false);
+  React.useEffect(() => setFailed(false), [src]);
+
+  const box = 'flex size-12 shrink-0 items-center justify-center overflow-hidden rounded border border-border bg-muted';
+  if (mediaType === 'image' && src && !failed) {
+    return (
+      <a href={src} target="_blank" rel="noreferrer" className={box} title="Open full size">
+        {/* eslint-disable-next-line @next/next/no-img-element -- served by the Studio API, not a static asset */}
+        <img src={src} alt={alt} loading="lazy" onError={() => setFailed(true)} className="size-full object-cover" />
+      </a>
+    );
+  }
+  const Icon = mediaType === 'video' ? FileVideo : mediaType === 'audio' ? FileAudio : ImageOff;
+  return (
+    <span className={box} aria-hidden>
+      <Icon className="size-5 text-muted-foreground" />
+    </span>
+  );
+}
diff --git a/apps/fastvideo_studio/src/lib/api.ts b/apps/fastvideo_studio/src/lib/api.ts
index 431b80478..29d3bbd96 100644
--- a/apps/fastvideo_studio/src/lib/api.ts
+++ b/apps/fastvideo_studio/src/lib/api.ts
@@ -61,6 +61,11 @@ export function getJobVideoUrl(jobId: string, version?: number): string {
 	return version ? `${base}?v=${version}` : base;
 }
 
+/** One of a job's image references, served only when the job lists it. */
+export function getJobReferenceUrl(jobId: string, source: string): string {
+	return `${getApiBaseUrl()}/jobs/${jobId}/reference?source=${encodeURIComponent(source)}`;
+}
+
 export interface CreateJobRequest {
 	model_id: string;
 	/** Optional label; the card and output filename fall back to the prompt. */
diff --git a/apps/fastvideo_studio/tests/test_mock_server_jobs.py b/apps/fastvideo_studio/tests/test_mock_server_jobs.py
index 5737bb34b..23a46072e 100644
--- a/apps/fastvideo_studio/tests/test_mock_server_jobs.py
+++ b/apps/fastvideo_studio/tests/test_mock_server_jobs.py
@@ -470,3 +470,59 @@ def test_snapshot_job_never_edited_has_an_empty_segment_list(client, snapshot_db
     assert mock_server._load_snapshot_from_db(data_dir)
 
     assert client.get("/api/jobs/fresh").json()["edit_segments"] == []
+
+
+def test_reference_preview_serves_only_the_jobs_own_image_references(tmp_path):
+    from fastapi.testclient import TestClient
+
+    image = tmp_path / "dana.jpg"
+    image.write_bytes(b"\xff\xd8\xff\xe0 not really a jpeg")
+    audio = tmp_path / "voice.mp3"
+    audio.write_bytes(b"ID3")
+    other = tmp_path / "secret.png"
+    other.write_bytes(b"\x89PNG")
+    client = TestClient(mock_server.app)
+    job = client.post("/api/jobs", json={"model_id": "MiniMaxAI/MiniMax-H3", "name": "p-clip-01", "prompt": "p",
+                                         "references": [{"source": str(image), "media_type": "image"},
+                                                        {"source": str(audio), "media_type": "audio"}]}).json()
+
+    def get(source, job_id=job["id"]):
+        return client.get(f"/api/jobs/{job_id}/reference", params={"source": source})
+
+    ok = get(str(image))
+    assert ok.status_code == 200 and ok.headers["content-type"] == "image/jpeg"
+    assert get(str(other)).status_code == 404  # an existing file the job does not list
+    assert get(str(audio)).status_code == 404  # listed, but not an image
+    assert get(str(image), job_id="missing").status_code == 404
+
+
+def test_state_file_keeps_mock_job_changes_across_a_restart(client, tmp_path, monkeypatch):
+    state = tmp_path / "mock_state.json"
+    snapshot_kept = {"id": "kept", "status": "completed", "prompt": "old", mock_server._FROM_SNAPSHOT_KEY: True}
+    snapshot_gone = {"id": "gone", "status": "completed", "prompt": "old", mock_server._FROM_SNAPSHOT_KEY: True}
+    monkeypatch.setattr(mock_server, "_state_file", state)
+    monkeypatch.setattr(mock_server, "_snapshot_originals", {"kept": dict(snapshot_kept), "gone": dict(snapshot_gone)})
+    mock_server._jobs.update({"kept": dict(snapshot_kept), "gone": dict(snapshot_gone)})
+
+    job = _create(client, name="diner-envelope-clip-01")
+    client.patch(f"/api/jobs/{job['id']}", json={"prompt": "edited"})
+    assert client.delete("/api/jobs/gone").status_code == 200
+
+    saved = __import__("json").loads(state.read_text())
+    assert [j["id"] for j in saved["jobs"]] == [job["id"]]  # the untouched snapshot job is not copied
+    assert saved["deleted_job_ids"] == ["gone"]
+
+    # "Restart": the snapshot loads again, then the saved state goes on top.
+    mock_server._jobs.clear()
+    mock_server._jobs.update({"kept": dict(snapshot_kept), "gone": dict(snapshot_gone)})
+    mock_server._load_state(state)
+
+    assert set(mock_server._jobs) == {"kept", job["id"]}
+    assert client.get(f"/api/jobs/{job['id']}").json()["prompt"] == "edited"
+
+
+def test_without_a_state_file_nothing_is_written(client, tmp_path, monkeypatch):
+    monkeypatch.setattr(mock_server, "_state_file", None)
+    monkeypatch.chdir(tmp_path)
+    _create(client)
+    assert list(tmp_path.iterdir()) == []