fix: Rezeptverlauf-Bilder lokal speichern und Windows-Subprocess-Fix

- Bilder beim Extrahieren lokal cachen (data/images/{id}.ext) und über GET /api/history/{id}/image ausliefern; Löschen bei Verlaufseintrag-Entfernung
- history.db in ./data/ Volume verschoben, damit sie Container-Rebuilds überlebt
- yt-dlp Subprocess-Aufrufe auf Windows gefixt: run_in_executor statt asyncio.create_subprocess_exec (SelectorEventLoop-Kompatibilität)
- ./data:/app/data Docker-Volume für persistente Datenhaltung hinzugefügt

app/api/extract.py

@@ -1,5 +1,6 @@
 """GET /api/extract/stream – SSE endpoint."""
 from __future__ import annotations
+import asyncio
 import json
 import logging
 from typing import AsyncGenerator
@@ -13,12 +14,22 @@ from app.extractors.video import extract_video
 from app.models import Recipe, StatusEvent, ErrorEvent, ExtractResponse
 from app.services.nutrition import enrich_nutrition
 from app.services.tandoor_service import recipe_to_tandoor
-from app.services.history_service import save_recipe as save_to_history
+from app.services.history_service import save_recipe as save_to_history, update_image_url
+from app.services import image_service
 
 log = logging.getLogger(__name__)
 router = APIRouter()
 
 
+async def _cache_image_background(history_id: int, remote_url: str) -> None:
+    local_path = await image_service.download_and_cache(history_id, remote_url)
+    if local_path:
+        try:
+            update_image_url(history_id, local_path)
+        except Exception as e:
+            log.warning("Failed to update image_url in DB: %s", e)
+
+
 def _sse(event: str, data: str) -> str:
     return f"event: {event}\ndata: {data}\n\n"
 
@@ -51,6 +62,8 @@ async def _stream(url: str) -> AsyncGenerator[str, None]:
             history_id = save_to_history(base.model_dump())
         except Exception as db_err:
             log.warning("History save failed: %s", db_err)
+        if history_id and recipe.image_url:
+            asyncio.create_task(_cache_image_background(history_id, recipe.image_url))
         response = ExtractResponse(recipe=recipe, tandoor_json=tandoor_json, history_id=history_id)
         yield _sse("result", response.model_dump_json())
 

app/api/history.py

@@ -1,6 +1,8 @@
-"""GET /api/history, DELETE /api/history/{id}"""
+"""GET /api/history, DELETE /api/history/{id}, GET /api/history/{id}/image"""
 from fastapi import APIRouter, HTTPException
+from fastapi.responses import FileResponse
 from app.services.history_service import get_all, delete_recipe
+from app.services import image_service
 
 router = APIRouter()
 
@@ -13,8 +15,21 @@ async def get_history():
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.get("/history/{history_id}/image")
+async def get_history_image(history_id: int):
+    path = image_service.find_cached_image(history_id)
+    if path is None:
+        raise HTTPException(status_code=404, detail="No cached image")
+    ext_to_mime = {v: k for k, v in image_service.MIME_TO_EXT.items()}
+    media_type = ext_to_mime.get(path.suffix.lstrip("."), "image/jpeg")
+    return FileResponse(path, media_type=media_type)
+
+
 @router.delete("/history/{history_id}")
 async def delete_history_entry(history_id: int):
+    cached = image_service.find_cached_image(history_id)
+    if cached:
+        cached.unlink(missing_ok=True)
     try:
         delete_recipe(history_id)
         return {"status": "ok"}

app/config.py

@@ -12,6 +12,7 @@ class Settings(BaseSettings):
     app_host: str = "0.0.0.0"
     app_port: int = 8000
     tmp_dir: str = "/app/tmp"
+    images_dir: str = "/app/data/images"
     ffmpeg_location: str = ""  # Optional: full path to ffmpeg binary dir (for Windows local dev)
 
 

app/extractors/video.py

@@ -4,7 +4,9 @@ import asyncio
 import json
 import logging
 import os
+import subprocess
 import uuid
+from functools import partial
 from pathlib import Path
 from typing import AsyncGenerator
 
@@ -122,19 +124,20 @@ def _ffmpeg_args() -> list[str]:
     return ["--ffmpeg-location", loc] if loc else []
 
 
+async def _run_yt_dlp(*args: str, timeout: int) -> tuple[bytes, bytes, int]:
+    """Run yt-dlp in a thread executor — works on any event loop (Windows + Linux)."""
+    loop = asyncio.get_event_loop()
+    func = partial(subprocess.run, args, capture_output=True, timeout=timeout)
+    result = await loop.run_in_executor(None, func)
+    return result.stdout, result.stderr, result.returncode
+
+
 async def _get_metadata(url: str) -> dict:
     """Run yt-dlp --dump-json to get metadata without downloading."""
-    proc = await asyncio.create_subprocess_exec(
-        "yt-dlp",
-        "--dump-json",
-        "--no-playlist",
-        *_ffmpeg_args(),
-        url,
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE,
+    stdout, stderr, returncode = await _run_yt_dlp(
+        "yt-dlp", "--dump-json", "--no-playlist", *_ffmpeg_args(), url, timeout=60
     )
-    stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=60)
-    if proc.returncode != 0:
+    if returncode != 0:
         err = stderr.decode(errors="replace")
         _check_tiktok_error(err, url)
         raise RuntimeError(f"yt-dlp Metadaten-Fehler: {err[:500]}")
@@ -148,26 +151,23 @@ async def _download_audio(url: str, output_path: Path) -> None:
     """Download audio only via yt-dlp subprocess (non-blocking)."""
     output_path.parent.mkdir(parents=True, exist_ok=True)
 
-    proc = await asyncio.create_subprocess_exec(
-        "yt-dlp",
-        "--no-playlist",
-        "--extract-audio",
-        "--audio-format", "mp3",
-        "--audio-quality", "5",
-        "--max-filesize", MAX_FILESIZE,
-        *_ffmpeg_args(),
-        "--output", str(output_path).replace(".mp3", ".%(ext)s"),
-        url,
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE,
-    )
     try:
-        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=300)
-    except asyncio.TimeoutError:
-        proc.kill()
+        stdout, stderr, returncode = await _run_yt_dlp(
+            "yt-dlp",
+            "--no-playlist",
+            "--extract-audio",
+            "--audio-format", "mp3",
+            "--audio-quality", "5",
+            "--max-filesize", MAX_FILESIZE,
+            *_ffmpeg_args(),
+            "--output", str(output_path).replace(".mp3", ".%(ext)s"),
+            url,
+            timeout=300,
+        )
+    except subprocess.TimeoutExpired:
         raise RuntimeError("Audio-Download Timeout (5 Min.) überschritten.")
 
-    if proc.returncode != 0:
+    if returncode != 0:
         err = stderr.decode(errors="replace")
         _check_tiktok_error(err, url)
         raise RuntimeError(f"Audio-Download fehlgeschlagen: {err[:500]}")

app/services/history_service.py

@@ -11,7 +11,7 @@ from app.config import get_settings
 
 def _db_path() -> Path:
     settings = get_settings()
-    return Path(settings.tmp_dir).parent / "history.db"
+    return Path(settings.images_dir).parent / "history.db"
 
 
 def init_db() -> None:
@@ -73,6 +73,15 @@ def delete_recipe(history_id: int) -> None:
         conn.commit()
 
 
+def update_image_url(history_id: int, image_url: str) -> None:
+    with sqlite3.connect(_db_path()) as conn:
+        conn.execute(
+            "UPDATE recipe_history SET image_url = ? WHERE id = ?",
+            (image_url, history_id),
+        )
+        conn.commit()
+
+
 def mark_imported(history_id: int, tandoor_recipe_id: Optional[int]) -> None:
     now = datetime.now(timezone.utc).isoformat()
     with sqlite3.connect(_db_path()) as conn:

app/services/image_service.py

@@ -0,0 +1,50 @@
+"""Local image caching for recipe history."""
+from __future__ import annotations
+import logging
+from pathlib import Path
+from typing import Optional
+
+import httpx
+
+from app.config import get_settings
+
+log = logging.getLogger(__name__)
+
+MIME_TO_EXT = {
+    "image/jpeg": "jpg",
+    "image/png": "png",
+    "image/webp": "webp",
+    "image/gif": "gif",
+}
+
+
+def images_dir() -> Path:
+    p = Path(get_settings().images_dir)
+    p.mkdir(parents=True, exist_ok=True)
+    return p
+
+
+def find_cached_image(history_id: int) -> Optional[Path]:
+    """Return the cached image Path for a history entry, or None."""
+    for ext in MIME_TO_EXT.values():
+        p = images_dir() / f"{history_id}.{ext}"
+        if p.exists():
+            return p
+    return None
+
+
+async def download_and_cache(history_id: int, remote_url: str) -> Optional[str]:
+    """Download image from remote_url, save locally, return local API path or None on failure."""
+    try:
+        async with httpx.AsyncClient(timeout=15) as client:
+            resp = await client.get(remote_url, follow_redirects=True)
+            resp.raise_for_status()
+            ct = resp.headers.get("content-type", "image/jpeg").split(";")[0].strip()
+            ext = MIME_TO_EXT.get(ct, "jpg")
+            dest = images_dir() / f"{history_id}.{ext}"
+            dest.write_bytes(resp.content)
+            log.info("Cached image for history %d → %s", history_id, dest)
+            return f"/api/history/{history_id}/image"
+    except Exception as exc:
+        log.warning("Image cache failed for history %d: %s", history_id, exc)
+        return None

app/static/app.js

@@ -280,10 +280,11 @@ function buildHistoryCard(entry) {
   const header = document.createElement('div');
   header.className = 'history-card-header';
 
-  if (recipe.image_url) {
+  const imageUrl = entry.image_url || recipe.image_url;
+  if (imageUrl) {
     const img = document.createElement('img');
     img.className = 'history-thumb';
-    img.src = recipe.image_url;
+    img.src = imageUrl;
     img.alt = '';
     img.onerror = () => img.remove();
     header.appendChild(img);