old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  
  from reversion.admin import VersionAdmin
  
  from hr import models
  
  
  class EthnicityAdmin(VersionAdmin):
      pass
  
  
  class SexualOrientationAdmin(VersionAdmin):
      pass
  
  
  class AptitudeAdmin(VersionAdmin):
      pass
  
  
  class AchievementAdmin(VersionAdmin):
      pass
  
  
  class SanctionAdmin(VersionAdmin):
      pass
  
  
  class EmployeeAdmin(VersionAdmin):
      pass
  
  
  class LanguageAdmin(VersionAdmin):
      pass
  
  
  class EmployeeSpeaksLanguageAdmin(VersionAdmin):
      pass
  
  
  class EmployeeHasSanctionAdmin(VersionAdmin):
      pass
  
  
  class AcademicInstitutionAdmin(VersionAdmin):
      pass
  
  
  class DegreeAdmin(VersionAdmin):
      pass
  
  
  class EmployeeHasDegreeAdmin(VersionAdmin):
      pass
  
  
  admin.site.register(models.Ethnicity, EthnicityAdmin)
  admin.site.register(models.SexualOrientation, SexualOrientationAdmin)
  admin.site.register(models.Aptitude, AptitudeAdmin)
  admin.site.register(models.Achievement, AchievementAdmin)
  admin.site.register(models.Sanction, SanctionAdmin)
  admin.site.register(models.Employee, EmployeeAdmin)
  admin.site.register(models.Language, LanguageAdmin)
  admin.site.register(
      models.EmployeeSpeaksLanguage,
      EmployeeSpeaksLanguageAdmin
  )
  admin.site.register(models.EmployeeHasSanction, EmployeeHasSanctionAdmin)
  admin.site.register(models.AcademicInstitution, AcademicInstitutionAdmin)
  admin.site.register(models.Degree, DegreeAdmin)
  admin.site.register(models.EmployeeHasDegree, EmployeeHasDegreeAdmin)
  
  
subject: ADD initial hr/admin.py