refactor: Introduce utility functions for exception handling and database operations; update auth and playlist services to use new exception methods

app/services/playlist.py

@@ -10,6 +10,11 @@ from app.models.playlist import Playlist
 from app.models.sound import Sound
 from app.repositories.playlist import PlaylistRepository
 from app.repositories.sound import SoundRepository
+from app.utils.exceptions import (
+    raise_bad_request,
+    raise_internal_server_error,
+    raise_not_found,
+)
 
 logger = get_logger(__name__)
 
@@ -27,10 +32,7 @@ class PlaylistService:
         """Get a playlist by ID."""
         playlist = await self.playlist_repo.get_by_id(playlist_id)
         if not playlist:
-            raise HTTPException(
-                status_code=status.HTTP_404_NOT_FOUND,
-                detail="Playlist not found",
-            )
+            raise_not_found("Playlist")
 
         return playlist
 
@@ -47,9 +49,8 @@ class PlaylistService:
         main_playlist = await self.playlist_repo.get_main_playlist()
 
         if not main_playlist:
-            raise HTTPException(
-                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
-                detail="Main playlist not found. Make sure to run database seeding."
+            raise_internal_server_error(
+                "Main playlist not found. Make sure to run database seeding."
             )
 
         return main_playlist