text: class DatabaseRouter:
      def db_for_read(self, model, **hints):
          if model._meta.app_label == 'custom_db_logger':
              return 'logger'
          return None
  
      def db_for_write(self, model, **hints):
          if model._meta.app_label == 'custom_db_logger':
              return 'logger'
          return None
  
      def allow_migrate(self, db, app_label, model_name=None, **hints):
          # Make sure custom_db_logger only appears in the 'logger' database
          if app_label == 'custom_db_logger':
              return db == 'logger'
          else:
              return db == 'default'
          return None