old_contents: from django.contrib import admin
  from django.db.models import get_models, get_app
  
  # Register your models here.
  
  
  for model in get_models(get_app('board')):
      admin.site.register(model)
  
new_contents: from django.contrib import admin
  from django.db.models import get_models, get_app
  
  
  for model in get_models(get_app('board')):
      admin.site.register(model)
  
subject: Remove unnecessary comments