diff --git a/pos/database.py b/pos/database.py
index 4491905..6e17049 100644
--- a/pos/database.py
+++ b/pos/database.py
@@ -94,9 +94,9 @@ class User(Base):
     uid = Column(Integer, primary_key=True)
     username = Column(String, nullable=False, unique=True)
     password = Column(PasswordType(schemes=PASSWORD_SCHEMES), nullable=False)
-    created_at = Column(DateTime, nullable=False, default=datetime.now)
     is_active = Column(Boolean, nullable=False, server_default='1')
     is_authenticated = Column(Boolean, nullable=False, server_default='0')
+    created_at = Column(DateTime, nullable=False, default=datetime.now)
 
     def get_id(self):
         return u'{}'.format(self.uid)
@@ -106,9 +106,9 @@ class Event(Base):
     __tablename__ = 'events'
     uid = Column(Integer, primary_key=True)
     name = Column(String, nullable=False)
-    created_at = Column(DateTime, nullable=False, default=datetime.now)
     starts_at = Column(DateTime, nullable=False, default=datetime.now)
     ends_at = Column(DateTime)
+    created_at = Column(DateTime, nullable=False, default=datetime.now)
 
     transactions = relationship('Transaction', lazy='joined')
 
@@ -119,8 +119,8 @@ class Product(Base):
     name = Column(String, nullable=False)
     price = Column(Integer, nullable=False)
     sort = Column(Integer, nullable=False, server_default='0')
-    created_at = Column(DateTime, nullable=False, default=datetime.now)
     is_active = Column(Boolean, nullable=False, server_default='1')
+    created_at = Column(DateTime, nullable=False, default=datetime.now)
 
 
 order_entry_association = Table(
@@ -133,8 +133,8 @@ order_entry_association = Table(
 class Transaction(Base):
     __tablename__ = 'transactions'
     uid = Column(Integer, primary_key=True)
-    created_at = Column(DateTime, nullable=False, default=datetime.now)
     event_uid = Column(Integer, ForeignKey('events.uid'), nullable=False)
+    created_at = Column(DateTime, nullable=False, default=datetime.now)
 
     event = relationship('Event')
     orders = relationship('Order', lazy='joined',