diff --git a/features/extension/storage/storage.go b/features/extension/storage/storage.go
index d53cdb86f..4ed58671a 100644
--- a/features/extension/storage/storage.go
+++ b/features/extension/storage/storage.go
@@ -9,15 +9,17 @@ type ScopedPersistentStorage interface {
 	Put(ctx context.Context, key []byte, value []byte) error
 	Get(ctx context.Context, key []byte) ([]byte, error)
 	List(ctx context.Context, keyPrefix []byte) ([][]byte, error)
-	ClearIfCharacteristicMismatch(ctx context.Context, characteristic []byte) error
+	Clear(ctx context.Context)
 	NarrowScope(ctx context.Context, key []byte) (ScopedPersistentStorage, error)
+	DropScope(ctx context.Context, key []byte) error
 }
 
 type ScopedTransientStorage interface {
 	ScopedTransientStorage()
-	Put(ctx context.Context, key []byte, value interface{}) error
-	Get(ctx context.Context, key []byte) (interface{}, error)
-	List(ctx context.Context, keyPrefix []byte) ([][]byte, error)
+	Put(ctx context.Context, key string, value interface{}) error
+	Get(ctx context.Context, key string) (interface{}, error)
+	List(ctx context.Context, keyPrefix string) ([]string, error)
 	Clear(ctx context.Context)
-	NarrowScope(ctx context.Context, key []byte) (ScopedPersistentStorage, error)
+	NarrowScope(ctx context.Context, key string) (ScopedPersistentStorage, error)
+	DropScope(ctx context.Context, key string) error
 }