Remove migration before 3.0

issue6470
review52421002

dashboard.py

@@ -22,12 +22,3 @@ class DashboardAction(sequence_ordered(), ModelSQL, ModelView):
                     ('groups', '=', None),
                 ],
             ])
-
-    @classmethod
-    def __register__(cls, module_name):
-        super(DashboardAction, cls).__register__(module_name)
-
-        table = cls.__table_handler__(module_name)
-
-        # Migration from 2.4: drop required on sequence
-        table.not_null_action('sequence', action='remove')

res.py

@@ -26,15 +26,6 @@ class User(metaclass=PoolMeta):
             'dashboard_actions',
             ]
 
-    @classmethod
-    def __register__(cls, module_name):
-        super(User, cls).__register__(module_name)
-
-        table = cls.__table_handler__(module_name)
-
-        # Migration from 1.6
-        table.not_null_action('dashboard_layout', action='remove')
-
     @staticmethod
     def default_dashboard_layout():
         return 'square'