fix activation code

app/auth/views/register.py

@@ -61,7 +61,10 @@ def register():
 
 
 def send_activation_email(user):
-    activation = ActivationCode.create(user_id=user.id, code=random_string(30))
+    # the activation code is valid for 1h
+    activation = ActivationCode.create(
+        user_id=user.id, code=random_string(30), expired=arrow.now().shift(hours=1)
+    )
     db.session.commit()
 
     # Send user activation email

app/models.py

@@ -196,8 +196,7 @@ class ActivationCode(db.Model, ModelMixin):
 
     user = db.relationship(User)
 
-    # the activation code is valid for 1h
-    expired = db.Column(ArrowType, default=arrow.now().shift(hours=1))
+    expired = db.Column(ArrowType)
 
 
 class ResetPasswordCode(db.Model, ModelMixin):