madmax1301
diff --git a/‎backend/scripts/recover_set_titles.py‎
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+#!/usr/bin/env python3
+"""Recovery-Tool für Falsch-Matches wenn die Container-Logs nicht mehr da sind.
+
+Companion zu ``cleanup_set_mismatches.py``: jenes Script braucht das Tonus-
+Log um die echten YT-Titel zu kennen. Wenn der Container recreated wurde
+(z.B. via ``docker compose pull && up -d``), ist der alte Log verloren.
+
+Dieses Script geht den anderen Weg:
+
+  1. Walked die Navidrome-Library, findet Audio-Files > MAX_TRACK_DURATION_S
+     (default 900s = 15min). Aus dem Pfad ``/music/<Artist>/<Album>/<Title>``
+     wird die ursprüngliche Spotify-Anfrage abgeleitet.
+  2. Replayed die Legacy-Suche: ``ytsearch1: <Artist> <Title> official audio``
+     mit yt-dlp (NO download — nur metadata-extract). Top-Result-Title wird
+     als der "echte" Set-Name angenommen.
+  3. Plant Rename + Retag (TITLE + ALBUM tags) damit die Datei unter dem
+     richtigen Namen in der Library erscheint.
+
+Limitations:
+
+  - YT-Search-Results können sich seit dem Original-Download geändert haben.
+    Für stabile Festival-Sets (Defqon.1, Q-dance) mit Millionen Views ist
+    das Top-Result aber praktisch deterministisch — daher der Recovery-
+    Ansatz hier robust genug.
+  - Funktioniert nur für Files die der Tonus-Pfad-Konvention folgen
+    (``/music/<Artist>/<Album>/<Title>.<ext>``). File-Drops außerhalb davon
+    werden übersprungen.
+  - Macht KEINEN echten Download. Nur metadata-extract via yt-dlp — schnell.
+
+Default ``--dry-run`` — zeigt was passieren würde ohne irgendwas anzufassen.
+``--apply`` schreibt tatsächlich Tags + File-Rename.
+
+Usage (auf NAS via docker exec)::
+
+    sudo docker exec tonus python3 /app/backend/scripts/recover_set_titles.py \\
+        --library /music \\
+        --dry-run
+
+    # Nach Review:
+    sudo docker exec tonus python3 /app/backend/scripts/recover_set_titles.py \\
+        --library /music \\
+        --apply
+
+Danach: Navidrome-Library-Scan triggern damit Subsonic-DB die neuen Titel
+sieht.
+"""
+
+from __future__ import annotations
+
+import argparse
+import re
+import sys
+from pathlib import Path
+from typing import Iterator, List, Optional, Tuple
+
+try:
+    from mutagen import File as MutagenFile
+except ImportError:
+    print("ERROR: mutagen not installed. Run: pip install mutagen", file=sys.stderr)
+    sys.exit(1)
+
+try:
+    import yt_dlp
+except ImportError:
+    print("ERROR: yt-dlp not installed. Run: pip install yt-dlp", file=sys.stderr)
+    sys.exit(1)
+
+
+# 15min Default. Wenn die Library auch legitime Extended-Mixes von 12-15min
+# hat, lieber höher setzen damit die nicht versehentlich getroffen werden.
+DEFAULT_MIN_DURATION_S = 900
+
+_FORBIDDEN_FILENAME_CHARS = re.compile(r'[<>:"/\\|?*\x00-\x1f]')
+_AUDIO_EXTS = {".opus", ".mp3", ".m4a", ".ogg", ".flac", ".wav"}
+
+# Folder unter dem Library-Root den wir überspringen — User kann hier
+# Falsch-Matches manuell quarantänen ohne dass das Script sie zweimal anpackt.
+_SKIP_DIRS = {"_falsch-matched", "_sets", "_quarantine"}
+
+
+# ──────────────────────────────────────────────────────────────────────
+# Library-Walker
+# ──────────────────────────────────────────────────────────────────────
+
+
+def iter_library_audio(library_root: Path) -> Iterator[Path]:
+    """Yield audio-files unter dem library-root, skipt Quarantäne-Folder."""
+    for p in library_root.rglob("*"):
+        if not p.is_file() or p.suffix.lower() not in _AUDIO_EXTS:
+            continue
+        # Skip quarantäne-ähnliche Folder
+        if any(part.lower() in _SKIP_DIRS for part in p.relative_to(library_root).parts):
+            continue
+        yield p
+
+
+def parse_request_from_path(path: Path, library_root: Path) -> Optional[Tuple[str, str]]:
+    """Parse Tonus' default path convention.
+
+    Erwartete Struktur::
+
+        /music/<Artist>/<Album>/<Track>.<ext>
+        /music/<Artist>/<Track>.<ext>        (no album subdir — selten)
+
+    Returns ``(artist, title)`` aus den Pfad-Komponenten. None wenn die
+    Struktur nicht passt (z.B. Track im Library-Root, oder verschachtelt
+    tiefer als 2 Ebenen).
+    """
+    try:
+        rel = path.relative_to(library_root)
+    except ValueError:
+        return None
+    parts = rel.parts
+    # parts: [Artist, Album, Title.ext] oder [Artist, Title.ext]
+    if len(parts) not in (2, 3):
+        return None
+    artist = parts[0].strip()
+    title = path.stem.strip()
+    if not artist or not title:
+        return None
+    return artist, title
+
+
+def get_audio_duration(path: Path) -> float:
+    """Read duration via mutagen. 0 bei Fehler."""
+    try:
+        mf = MutagenFile(str(path))
+        return float(mf.info.length) if mf and getattr(mf, "info", None) else 0.0
+    except Exception:
+        return 0.0
+
+
+# ──────────────────────────────────────────────────────────────────────
+# YT-Search-Replay
+# ──────────────────────────────────────────────────────────────────────
+
+
+def yt_search_top_title(artist: str, title: str, ydl: "yt_dlp.YoutubeDL") -> Optional[str]:
+    """Replay den Legacy-Fallback-Query und return den top-result-Title.
+
+    Identische Query-Form wie ``youtube.py::search_and_download`` im
+    Legacy-Fallback-Pfad (vor v0.3.1): ``<artist> <title> official audio``.
+    """
+    query = f"{artist} {title} official audio"
+    try:
+        info = ydl.extract_info(f"ytsearch1:{query}", download=False)
+    except Exception as e:
+        print(f"  WARN: ytsearch1 failed: {type(e).__name__}: {e}")
+        return None
+    if not info:
+        return None
+    entries = info.get("entries") or []
+    if not entries:
+        return None
+    top = entries[0]
+    if not top:
+        return None
+    return top.get("title")
+
+
+def sanitize_filename_segment(s: str) -> str:
+    cleaned = _FORBIDDEN_FILENAME_CHARS.sub("_", s)
+    return cleaned.strip(" .")[:200]
+
+
+def write_title_tags(audio_path: Path, new_title: str) -> bool:
+    """Updated TITLE-Tag. Album-Tag bleibt unverändert — User kann den
+    Album-Folder später manuell aufräumen wenn er konsistent benannt sein
+    soll.
+    """
+    try:
+        mf = MutagenFile(str(audio_path), easy=True)
+        if mf is None:
+            return False
+        mf["title"] = [new_title]
+        mf.save()
+        return True
+    except Exception as e:
+        print(f"  ERROR: cannot write title tag on {audio_path}: {type(e).__name__}: {e}")
+        return False
+
+
+def is_meaningful_change(old_title: str, new_title: str) -> bool:
+    """Heuristik: skip wenn der YT-Titel essentiell der gleiche Track ist.
+
+    Beispiel: requested "Lose Yourself" → YT returnt "Lose Yourself (Soundtrack)".
+    Das wäre kein Falsch-Match sondern ein echter Track mit Suffix. Wenn der
+    requested-Title (case+space-normalized) vollständig im YT-Titel
+    enthalten ist UND die Länge nicht dramatisch unterschiedlich ist
+    → skip, das war wahrscheinlich legit.
+    """
+    norm = lambda s: re.sub(r"[^a-z0-9]+", "", s.lower())
+    old_norm = norm(old_title)
+    new_norm = norm(new_title)
+    if old_norm in new_norm:
+        # Length-Ratio check: wenn der neue Titel 2x so lang wäre wie
+        # der alte oder mehr, ist es kein "nur Suffix" sondern wirklich
+        # ein anderer Title (z.B. Festival-Set-Header).
+        if len(new_norm) < 2 * len(old_norm):
+            return False  # not meaningful, probably legit extended mix
+    return True
+
+
+# ──────────────────────────────────────────────────────────────────────
+# Main
+# ──────────────────────────────────────────────────────────────────────
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        description="Recover real titles for falsch-matched long files via YT-reverse-search."
+    )
+    parser.add_argument(
+        "--library",
+        type=Path,
+        required=True,
+        help="Navidrome library root (z.B. /music im Container, /volume1/music auf Host)",
+    )
+    parser.add_argument(
+        "--min-duration",
+        type=int,
+        default=DEFAULT_MIN_DURATION_S,
+        help=f"Nur Files mit duration > N seconds anfassen (default: {DEFAULT_MIN_DURATION_S})",
+    )
+    parser.add_argument(
+        "--apply",
+        action="store_true",
+        help="Tatsächlich umbenennen + retaggen (default: dry-run)",
+    )
+    parser.add_argument(
+        "--limit",
+        type=int,
+        default=0,
+        help="Nur die ersten N Kandidaten verarbeiten (für Tests). 0 = unlimitiert.",
+    )
+    args = parser.parse_args()
+
+    if not args.library.exists() or not args.library.is_dir():
+        print(f"ERROR: library not found: {args.library}", file=sys.stderr)
+        return 1
+
+    dry_run = not args.apply
+
+    # ── Step 1: Library walken + Kandidaten sammeln ──
+    print(f"Scanning {args.library} for files > {args.min_duration}s …")
+    candidates: List[Tuple[Path, str, str, float]] = []  # (path, artist, title, duration)
+    for audio_path in iter_library_audio(args.library):
+        duration = get_audio_duration(audio_path)
+        if duration <= args.min_duration:
+            continue
+        parsed = parse_request_from_path(audio_path, args.library)
+        if parsed is None:
+            continue
+        artist, title = parsed
+        candidates.append((audio_path, artist, title, duration))
+
+    print(f"  Found {len(candidates)} candidate file(s)")
+    if not candidates:
+        print("Nothing to do.")
+        return 0
+
+    if args.limit and args.limit < len(candidates):
+        print(f"  Limiting to first {args.limit} for this run")
+        candidates = candidates[: args.limit]
+
+    # ── Step 2: YT-Search-Replay pro Kandidat ──
+    ydl_opts = {
+        "quiet": True,
+        "no_warnings": True,
+        "skip_download": True,
+        "noplaylist": True,
+        "extract_flat": False,
+    }
+
+    rename_plan: List[Tuple[Path, Path, str, str]] = []  # (old, new, old_title, new_title)
+    skipped_no_match = 0
+    skipped_not_meaningful = 0
+
+    print(f"\nReplaying YT-searches for {len(candidates)} candidate(s) …")
+    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
+        for audio_path, artist, title, duration in candidates:
+            print(f"  • {artist} — {title}  ({duration:.0f}s)")
+            actual_title = yt_search_top_title(artist, title, ydl)
+            if not actual_title:
+                print("    (no YT result)")
+                skipped_no_match += 1
+                continue
+            if not is_meaningful_change(title, actual_title):
+                print(f"    → {actual_title!r}  (skipped: similar to requested)")
+                skipped_not_meaningful += 1
+                continue
+            new_filename = (
+                f"{sanitize_filename_segment(artist)} - "
+                f"{sanitize_filename_segment(actual_title)}{audio_path.suffix}"
+            )
+            new_path = audio_path.parent / new_filename
+            if new_path == audio_path:
+                continue
+            rename_plan.append((audio_path, new_path, title, actual_title))
+            print(f"    → {actual_title!r}")
+
+    print()
+    print(f"Summary: {len(rename_plan)} rename(s) planned, "
+          f"{skipped_no_match} skipped (no YT result), "
+          f"{skipped_not_meaningful} skipped (not meaningful change)")
+
+    if not rename_plan:
+        return 0
+
+    # ── Step 3: Apply oder Dry-Run-Ausgabe ──
+    print()
+    if dry_run:
+        print("=== DRY RUN — no changes will be made ===")
+    else:
+        print("=== APPLYING CHANGES ===")
+    print()
+
+    renamed_ok = 0
+    failed = 0
+    for old_path, new_path, old_title, new_title in rename_plan:
+        rel_old = old_path.relative_to(args.library)
+        rel_new = new_path.relative_to(args.library)
+        size_mb = old_path.stat().st_size / (1024 * 1024)
+
+        print(f"  {rel_old}  ({size_mb:.1f} MB)")
+        print(f"  → {rel_new}")
+        print(f"    title-tag: {old_title!r} → {new_title!r}")
+
+        if not dry_run:
+            if not write_title_tags(old_path, new_title):
+                print("    ❌ tag-write failed, skipping rename")
+                failed += 1
+                print()
+                continue
+            if new_path.exists():
+                print(f"    ❌ target exists, skipping rename: {new_path.name}")
+                failed += 1
+                print()
+                continue
+            try:
+                old_path.rename(new_path)
+                print("    ✓ renamed + retagged")
+                renamed_ok += 1
+            except OSError as e:
+                print(f"    ❌ rename failed: {e}")
+                failed += 1
+        print()
+
+    if dry_run:
+        print(f"\n{len(rename_plan)} files would be renamed. Re-run with --apply to commit.")
+    else:
+        print(f"\n✓ {renamed_ok} renamed")
+        if failed:
+            print(f"❌ {failed} failed")
+        print("Trigger a Navidrome library scan to refresh Subsonic-DB.")
+
+    return 0 if failed == 0 else 2
+
+
+if __name__ == "__main__":
+    sys.exit(main())