old_contents: from django.contrib import admin
  
  from .models import Breach
  
  admin.site.register(Breach)
  
new_contents: from django.contrib import admin
  
  from .models import Target, Victim, SampleSet, AttackVectorElement
  
  admin.site.register(Target)
  admin.site.register(Victim)
  admin.site.register(SampleSet)
  admin.site.register(AttackVectorElement)
  
subject: Fix imported models in breach admin