added create_time factory

core/database/classes/dataset.py

@@ -1,11 +1,15 @@
 from __future__ import annotations
 
 import random
+from datetime import datetime
+from datetime import UTC
 
 from pydantic import BaseModel
+from pydantic import Field
 
 
 class Dataset(BaseModel):
+    create_time: datetime = Field(default_factory=lambda: datetime.now(UTC))
     train_names: list[str]
     test_names: list[str]
     validation_names: list[str]