try fix licenses

app/core/models/user/__init__.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 from sqlalchemy import Column, Integer, String, BigInteger, DateTime, JSON
 from sqlalchemy.orm import relationship
 
@@ -19,8 +20,9 @@ class User(AlchemyBase, DisplayMixin, TranslationCore, AuthenticationMixin_V1, W
     lang_code = Column(String(8), nullable=False, default="en")
     meta = Column(JSON, nullable=False, default={})
 
-    last_use = Column(DateTime, nullable=False, default=0)
-    created = Column(DateTime, nullable=False, default=0)
+    last_use = Column(DateTime, nullable=False, default=datetime.utcnow)
+    updated = Column(DateTime, nullable=False, default=datetime.utcnow)
+    created = Column(DateTime, nullable=False, default=datetime.utcnow)
 
     balances = relationship('UserBalance', back_populates='user')
     internal_transactions = relationship('InternalTransaction', back_populates='user')