old_contents: # coding: UTF-8
  from django.db import models
  from django.db.models import fields
  
  
  class Mensagem(models.Model): 
      conteudo = models.TextField(null=False, blank=False)
      user_id = fields.CharField(null=False)
  
  
  class Config(models.Model):
      name = fields.CharField(null=False)
      value = fields.CharField(null=False)
  
      @classmethod
      def get(cls, name, default_value=''):
          try:
              config = cls.objects.get(name=name)
          except cls.DoesNotExist:
              config = Config(name=name, value=default_value)
              config.save()
          return config.value
new_contents: # coding: UTF-8
  from django.db import models
  from django.db.models import fields
  
  
  class Mensagem(models.Model): 
      conteudo = models.TextField(null=False, blank=False)
      user_id = fields.CharField(null=False, max_length=64)
  
  
  class Config(models.Model):
      name = fields.CharField(null=False, max_length=64)
      value = fields.CharField(null=False, max_length=512)
  
      @classmethod
      def get(cls, name, default_value=''):
          try:
              config = cls.objects.get(name=name)
          except cls.DoesNotExist:
              config = Config(name=name, value=default_value)
              config.save()
          return config.value
subject: deploy fix