diff --git a/selfprivacy_api/backup/__init__.py b/selfprivacy_api/backup/__init__.py
index bd16488..9722b71 100644
--- a/selfprivacy_api/backup/__init__.py
+++ b/selfprivacy_api/backup/__init__.py
@@ -48,6 +48,7 @@ class NotDeadError(AssertionError):
     """
     This error is raised when we try to back up a service that is not dead yet.
     """
+
     def __init__(self, service: Service):
         self.service_name = service.get_id()
         super().__init__()
diff --git a/selfprivacy_api/backup/storage.py b/selfprivacy_api/backup/storage.py
index bda7f09..f7384a0 100644
--- a/selfprivacy_api/backup/storage.py
+++ b/selfprivacy_api/backup/storage.py
@@ -32,6 +32,7 @@ redis = RedisPool().get_connection()
 
 class Storage:
     """Static class for storing backup related data in redis"""
+
     @staticmethod
     def reset() -> None:
         """Deletes all backup related data from redis"""
diff --git a/selfprivacy_api/repositories/tokens/redis_tokens_repository.py b/selfprivacy_api/repositories/tokens/redis_tokens_repository.py
index 80825bc..8e683d2 100644
--- a/selfprivacy_api/repositories/tokens/redis_tokens_repository.py
+++ b/selfprivacy_api/repositories/tokens/redis_tokens_repository.py
@@ -128,7 +128,9 @@ class RedisTokensRepository(AbstractTokensRepository):
 
     @staticmethod
     def _prepare_model_dict(model_dict: dict[str, Any]) -> None:
-        date_keys = [key for key in model_dict.keys() if RedisTokensRepository._is_date_key(key)]
+        date_keys = [
+            key for key in model_dict.keys() if RedisTokensRepository._is_date_key(key)
+        ]
         for date in date_keys:
             if model_dict[date] != "None":
                 model_dict[date] = datetime.fromisoformat(model_dict[date])