old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  
  
  class BondAdmin(admin.ModelAdmin):
      list_display = [
          'id',
          'name',
          'face_value',
          'annual_coupon_rate',
          'annual_payment_frequency',
          'issue_date',
          'settlement_date',
          'maturity_date'
      ]
  
subject: Add BondAdmin model class.