old_contents: import datetime
  from flask import Markup
  from sqlalchemy import Table, Column, Integer, String, MetaData, ForeignKey, DateTime, Text
  from sqlalchemy.orm import relationship
  from app import db
  from flask.ext.appbuilder.models.mixins import AuditMixin, BaseMixin, FileColumn, ImageColumn
  from flask.ext.appbuilder.filemanager import ImageManager
  from flask.ext.appbuilder import Base
  
  class Group(BaseMixin, Base):
      id = Column(Integer, primary_key=True)
      name =  Column(String(50), unique = True, nullable=False)
      address =  Column(String(264))
      phone1 = Column(String(20))
      phone2 = Column(String(20))
      taxid = Column(Integer)
      notes = Column(Text())
  
      def __repr__(self):
          return self.name
  
  
  class Person(BaseMixin, Base):
      id = Column(Integer, primary_key=True)
      name =  Column(String(150), unique = True, nullable=False)
      address =  Column(String(564))
      birthday = Column(Date)
      photo = Column(ImageColumn, nullable=False )
      personal_phone = Column(String(20))
      personal_celphone = Column(String(20))
      personal_email = Column(String(64))
      notes = Column(Text())
      business_function = Column(String(64))
      business_phone = Column(String(20))
      business_celphone = Column(String(20))
      business_email = Column(String(64))
      group_id = Column(Integer, ForeignKey('group.id'))
      group = relationship("Group")
  
  
      def photo_img(self):
          im = ImageManager()
          if self.photo:
              return Markup('<a href="/persons/show/' + str(self.id) + '" class="thumbnail"><img src="' + im.get_url(self.photo) + '" alt="Photo" class="img-rounded img-responsive"></a>')
          else:
              return Markup('<a href="/persons/show/' + str(self.id) + '" class="thumbnail"><img src="//:0" alt="Photo" class="img-responsive"></a>')
          
  
new_contents: import datetime
  from flask import Markup
  from sqlalchemy import Table, Column, Integer, String, MetaData, ForeignKey, Date, Text
  from sqlalchemy.orm import relationship
  from app import db
  from flask.ext.appbuilder.models.mixins import AuditMixin, BaseMixin, FileColumn, ImageColumn
  from flask.ext.appbuilder.filemanager import ImageManager
  from flask.ext.appbuilder import Base
  
  class Group(BaseMixin, Base):
      id = Column(Integer, primary_key=True)
      name =  Column(String(50), unique = True, nullable=False)
      address =  Column(String(264))
      phone1 = Column(String(20))
      phone2 = Column(String(20))
      taxid = Column(Integer)
      notes = Column(Text())
  
      def __repr__(self):
          return self.name
  
  
  class Person(BaseMixin, Base):
      id = Column(Integer, primary_key=True)
      name =  Column(String(150), unique = True, nullable=False)
      address =  Column(String(564))
      birthday = Column(Date)
      photo = Column(ImageColumn, nullable=False )
      personal_phone = Column(String(20))
      personal_celphone = Column(String(20))
      personal_email = Column(String(64))
      notes = Column(Text())
      business_function = Column(String(64))
      business_phone = Column(String(20))
      business_celphone = Column(String(20))
      business_email = Column(String(64))
      group_id = Column(Integer, ForeignKey('group.id'))
      group = relationship("Group")
  
  
      def photo_img(self):
          im = ImageManager()
          if self.photo:
              return Markup('<a href="/persons/show/' + str(self.id) + '" class="thumbnail"><img src="' + im.get_url(self.photo) + '" alt="Photo" class="img-rounded img-responsive"></a>')
          else:
              return Markup('<a href="/persons/show/' + str(self.id) + '" class="thumbnail"><img src="//:0" alt="Photo" class="img-responsive"></a>')
          
  
subject: Update models.py