added delete option

src/server/database/service.py

@@ -210,6 +210,25 @@ class AnimeSeriesService:
         )
         return result.scalar_one_or_none()
 
+    @staticmethod
+    async def get_folder_path(
+        db: AsyncSession,
+        series_key: str,
+    ) -> Optional[str]:
+        """Get the filesystem folder path for a series by its key.
+
+        Args:
+            db: Database session
+            series_key: Provider key (e.g. "attack-on-titan")
+
+        Returns:
+            Folder path string, or None if series not found
+        """
+        result = await db.execute(
+            select(AnimeSeries.folder).where(AnimeSeries.key == series_key)
+        )
+        return result.scalar_one_or_none()
+
     @staticmethod
     async def get_all(
         db: AsyncSession,