old_contents: from django.contrib.auth.models import User, Group
  from django.db import models
  from djangotoolbox.fields import ListField
  
  
  class UserPermissionList(models.Model):
      user = models.ForeignKey(User)
      
      permission_list = ListField(models.CharField(max_length=128))
      permission_fk_list = ListField(models.CharField(max_length=32))
  
      group_fk_list = ListField(models.CharField(max_length=32))
  
  
  class GroupPermissionList(models.Model):
      group = models.ForeignKey(Group)
      permission_list = ListField(models.CharField(max_length=128))
      permission_fk_list = ListField(models.CharField(max_length=32))
  
new_contents: from django.contrib.auth.models import User, Group
  from django.db import models
  from djangotoolbox.fields import ListField
  
  
  class UserPermissionList(models.Model):
      user = models.ForeignKey(User)
      
      permission_list = ListField(models.CharField(max_length=64))
      permission_fk_list = ListField(models.CharField(max_length=32))
  
      group_fk_list = ListField(models.CharField(max_length=32))
  
  
  class GroupPermissionList(models.Model):
      group = models.ForeignKey(Group)
      permission_list = ListField(models.CharField(max_length=64))
      permission_fk_list = ListField(models.CharField(max_length=32))
  
subject: reduce permission_list CharField length to 64