style: apply ruff formatting to source and test files

app/domain/entities/base.py

@@ -2,7 +2,7 @@
 
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from typing import Any
 from uuid import UUID, uuid4
 
@@ -12,8 +12,8 @@ class BaseEntity(ABC):
     """Base class for all domain entities."""
 
     id: UUID = field(default_factory=uuid4)
-    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
-    updated_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
+    created_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    updated_at: datetime = field(default_factory=lambda: datetime.now(UTC))
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, BaseEntity):
@@ -25,7 +25,7 @@ class BaseEntity(ABC):
 
     def touch(self) -> None:
         """Update the updated_at timestamp."""
-        self.updated_at = datetime.now(timezone.utc)
+        self.updated_at = datetime.now(UTC)
 
     @abstractmethod
     def to_dict(self) -> dict[str, Any]: