Removed unused methods from queue repository

app/src/main/java/com/cappielloantonio/play/database/dao/PlaylistDao.java

@@ -16,18 +16,9 @@ public interface PlaylistDao {
     @Query("SELECT * FROM playlist")
     LiveData<List<Playlist>> getAll();
 
-    @Query("SELECT EXISTS(SELECT * FROM playlist WHERE id = :id)")
-    boolean exist(String id);
-
-    @Insert(onConflict = OnConflictStrategy.REPLACE)
-    void insert(Playlist playlist);
-
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     void insertAll(List<Playlist> playlists);
 
-    @Delete
-    void delete(Playlist playlist);
-
     @Query("DELETE FROM playlist")
     void deleteAll();
 }