diff --git a/app/src/main/java/com/cappielloantonio/play/database/dao/PlaylistDao.java b/app/src/main/java/com/cappielloantonio/play/database/dao/PlaylistDao.java
index 486d9d5e..e1f026e6 100644
--- a/app/src/main/java/com/cappielloantonio/play/database/dao/PlaylistDao.java
+++ b/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();
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/cappielloantonio/play/repository/PlaylistRepository.java b/app/src/main/java/com/cappielloantonio/play/repository/PlaylistRepository.java
index b64c9294..d45f1dd5 100644
--- a/app/src/main/java/com/cappielloantonio/play/repository/PlaylistRepository.java
+++ b/app/src/main/java/com/cappielloantonio/play/repository/PlaylistRepository.java
@@ -25,83 +25,12 @@ public class PlaylistRepository {
         return listLivePlaylists;
     }
 
-    public boolean exist(Playlist playlist) {
-        boolean exist = false;
-
-        ExistThreadSafe existThread = new ExistThreadSafe(playlistDao, playlist);
-        Thread thread = new Thread(existThread);
-        thread.start();
-
-        try {
-            thread.join();
-            exist = existThread.exist();
-        }
-        catch (InterruptedException e) {
-            e.printStackTrace();
-        }
-
-        return exist;
-    }
-
-    public void insert(Playlist playlist) {
-        InsertThreadSafe insert = new InsertThreadSafe(playlistDao, playlist);
-        Thread thread = new Thread(insert);
-        thread.start();
-    }
-
     public void insertAll(ArrayList<Playlist> playlists) {
         InsertAllThreadSafe insertAll = new InsertAllThreadSafe(playlistDao, playlists);
         Thread thread = new Thread(insertAll);
         thread.start();
     }
 
-    public void delete(Playlist playlist) {
-        DeleteThreadSafe delete = new DeleteThreadSafe(playlistDao, playlist);
-        Thread thread = new Thread(delete);
-        thread.start();
-    }
-
-    public void deleteAll() {
-        DeleteAllThreadSafe delete = new DeleteAllThreadSafe(playlistDao);
-        Thread thread = new Thread(delete);
-        thread.start();
-    }
-
-    private static class ExistThreadSafe implements Runnable {
-        private PlaylistDao playlistDao;
-        private Playlist playlist;
-        private boolean exist = false;
-
-        public ExistThreadSafe(PlaylistDao playlistDao, Playlist playlist) {
-            this.playlistDao = playlistDao;
-            this.playlist = playlist;
-        }
-
-        @Override
-        public void run() {
-            exist = playlistDao.exist(playlist.getId());
-        }
-
-        public boolean exist() {
-            return exist;
-        }
-    }
-
-    private static class InsertThreadSafe implements Runnable {
-        private PlaylistDao playlistDao;
-        private Playlist playlist;
-
-        public InsertThreadSafe(PlaylistDao playlistDao, Playlist playlist) {
-            this.playlistDao = playlistDao;
-            this.playlist = playlist;
-        }
-
-        @Override
-        public void run() {
-            playlistDao.insert(playlist);
-        }
-    }
-
     private static class InsertAllThreadSafe implements Runnable {
         private PlaylistDao playlistDao;
         private ArrayList<Playlist> playlists;
@@ -118,19 +47,10 @@ public class PlaylistRepository {
         }
     }
 
-    private static class DeleteThreadSafe implements Runnable {
-        private PlaylistDao playlistDao;
-        private Playlist playlist;
-
-        public DeleteThreadSafe(PlaylistDao playlistDao, Playlist playlist) {
-            this.playlistDao = playlistDao;
-            this.playlist = playlist;
-        }
-
-        @Override
-        public void run() {
-            playlistDao.delete(playlist);
-        }
+    public void deleteAll() {
+        DeleteAllThreadSafe delete = new DeleteAllThreadSafe(playlistDao);
+        Thread thread = new Thread(delete);
+        thread.start();
     }
 
     private static class DeleteAllThreadSafe implements Runnable {