fix dates

models/Asset.py

@@ -2,7 +2,7 @@ from datetime import datetime, UTC
 from enum import Enum
 from typing import Optional, Any, List
 
-from pydantic import BaseModel, computed_field
+from pydantic import BaseModel, computed_field, Field
 
 
 class AssetType(str, Enum):
@@ -19,7 +19,8 @@ class Asset(BaseModel):
     tg_doc_file_id: Optional[str] = None
     tg_photo_file_id: Optional[str] = None
     tags: List[str] = []
-    created_at: datetime = datetime.now(UTC)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
 
     # --- CALCULATED FIELD ---
     @computed_field