feat: genre field in DetailPanel and ID3 TCON tag

- Added genre column to clips table (auto-migration)
- Genre field in DetailPanel metadata section (between Album and Comment)
- Genre saved via PATCH /api/clips/:id/metadata
- Genre embedded in ID3 TCON tag on download
- Placeholder text: 'e.g. Hardcore Techno, Phonk, Dark Ambient...'

backend/src/database.py

@@ -98,6 +98,11 @@ async def init_db():
             await db.execute("ALTER TABLE clips ADD COLUMN comment TEXT")
         except Exception:
             pass  # Column already exists
+        # Migration: add genre column if it doesn't exist
+        try:
+            await db.execute("ALTER TABLE clips ADD COLUMN genre TEXT")
+        except Exception:
+            pass  # Column already exists
         await db.commit()
 
 async def create_clip(prompt: str, model: str, duration: int, prompt_structure: str = None) -> str:
@@ -176,11 +181,11 @@ async def rename_clip(clip_id: str, title: str):
         )
         await db.commit()
 
-async def update_metadata(clip_id: str, artist: str = None, album: str = None, comment: str = None):
+async def update_metadata(clip_id: str, artist: str = None, album: str = None, comment: str = None, genre: str = None):
     async with aiosqlite.connect(DB_PATH) as db:
         await db.execute(
-            "UPDATE clips SET artist = ?, album = ?, comment = ? WHERE id = ?",
-            (artist, album, comment, clip_id)
+            "UPDATE clips SET artist = ?, album = ?, comment = ?, genre = ? WHERE id = ?",
+            (artist, album, comment, genre, clip_id)
         )
         await db.commit()
 

backend/src/main.py

@@ -135,7 +135,7 @@ async def stream_audio(clip_id: str):
     return FileResponse(file_path, media_type="audio/mpeg", filename=clip["filename"])
 
 from mutagen.mp3 import MP3
-from mutagen.id3 import ID3, TIT1, TIT2, TPE1, TALB, COMM, TBPM, TKEY, APIC, PictureType
+from mutagen.id3 import ID3, TIT1, TIT2, TPE1, TALB, COMM, TBPM, TKEY, APIC, PictureType, TCON
 
 @app.get("/api/clips/{clip_id}/download")
 async def download_clip(clip_id: str):
@@ -197,6 +197,10 @@ async def download_clip(clip_id: str):
             if clip.get("key"):
                 audio.tags["TKEY"] = TKEY(encoding=3, text=clip["key"])
             
+            # Genre
+            if clip.get("genre"):
+                audio.tags["TCON"] = TCON(encoding=3, text=clip["genre"])
+            
             # Album art
             if clip.get("artwork_filename"):
                 artwork_path = ARTWORK_DIR / clip["artwork_filename"]
@@ -496,7 +500,7 @@ async def update_clip_metadata(clip_id: str, request: MetadataRequest):
     clip = await get_clip(clip_id)
     if not clip:
         raise HTTPException(status_code=404, detail="Clip not found")
-    await update_metadata(clip_id, request.artist, request.album, request.comment)
+    await update_metadata(clip_id, request.artist, request.album, request.comment, request.genre)
     updated = await get_clip(clip_id)
     return updated
 

backend/src/models.py

@@ -92,6 +92,7 @@ class MetadataRequest(BaseModel):
     artist: Optional[str] = None
     album: Optional[str] = None
     comment: Optional[str] = None
+    genre: Optional[str] = None
 
 class GenerateArtworkRequest(BaseModel):
     prompt: str