add renewwww queueueue

backend/src/song.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+
 from .connect import get_connection
 
 
@@ -19,7 +20,7 @@ def init_db():
     conn.close()
 
 
-@dataclass
+@dataclass(frozen=True)
 class Song:
     mbid: str
     title: str