feat: add "Nur Ohne Deutsch" scan option to rescan only current missing-German entries without clearing cache

Add "missing" job state to jobs dict with idle/total/done/error tracking. Update start_scan() to handle "missing" source by filtering radarr_rows() and sonarr_groups() for is_german_review_candidate() entries without has_german_track(). Skip cache deletion for missing-German scan in api_rescan() with comment explaining cache preservation. Add "Nur Ohne Deutsch" option to scanSource select

app.py

@@ -75,7 +75,7 @@ def service_worker():
     return response
 executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "2")))
 scan_executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "4")))
-jobs = {"radarr": {"state": "idle", "total": 0, "done": 0, "error": None}, "sonarr": {"state": "idle", "total": 0, "done": 0, "error": None}}
+jobs = {"radarr": {"state": "idle", "total": 0, "done": 0, "error": None}, "sonarr": {"state": "idle", "total": 0, "done": 0, "error": None}, "missing": {"state": "idle", "total": 0, "done": 0, "error": None}}
 job_lock = threading.Lock()
 system_lock = threading.Lock()
 previous_cpu = None
@@ -828,9 +828,15 @@ def start_scan(source, force=False):
             if source == "radarr":
                 for row in radarr_rows():
                     if row["local_path"] != "—" and row["pending"]: paths.append(row["local_path"])
-            else:
+            elif source == "sonarr":
                 for group in sonarr_groups():
                     paths.extend(r["local_path"] for r in group["episodes"] if r["local_path"] != "—" and r["pending"])
+            else:
+                for row in radarr_rows():
+                    if row["local_path"] != "—" and is_german_review_candidate(row) and not has_german_track(row): paths.append(row["local_path"])
+                if SONARR_URL and SONARR_API_KEY:
+                    for group in sonarr_groups():
+                        paths.extend(r["local_path"] for r in group["episodes"] if r["local_path"] != "—" and is_german_review_candidate(r) and not has_german_track(r))
             with job_lock: jobs[source]["total"] = len(paths)
             futures = [scan_executor.submit(scan_one, path) for path in paths]
             for future in as_completed(futures):
@@ -888,6 +894,8 @@ def api_rescan():
     con = db()
     if source in ("radarr", "all"): con.execute("DELETE FROM media_cache WHERE path NOT LIKE ?", (LOCAL_SERIES_PATH.rstrip("/") + "/%",))
     if source in ("sonarr", "all"): con.execute("DELETE FROM media_cache WHERE path LIKE ?", (LOCAL_SERIES_PATH.rstrip("/") + "/%",))
+    # The missing-German scan deliberately keeps the cache: it re-processes
+    # only current candidates and leaves the rest of the library untouched.
     con.commit(); con.close()
     if source == "all":
         start_scan("radarr", force=True)