new_contents: import back
  import data
  
  link = {}
  
  with db_session:
      for node in back.Node.select():
          _node = data.Node(name=node.name, text=node.text, note=node.notes)
          link[node.serial] = _node.serial
  
  print(link)
      
  
subject: Create from_back_to_data.py