text: import peewee as pw
  from playhouse.sqlite_ext import JSONField
  from echr.data_models.base import BaseModel
  from echr.data_models.case import Case
  
  
  class Attachment(BaseModel):
      tag = pw.CharField(null=False)
      case = pw.ForeignKeyField(Case, backref='cases')
  
      class Meta:
          '''
              Metaclass to assign the primary key
          '''
          primary_key = pw.CompositeKey('tag', 'case')
  
  
  class Table(Attachment):
      content = JSONField(null=False)
  
  