new_contents: from django.contrib import admin
  
  from .models import Project, Timeline, Event, TimelineMapping
  
  
  admin.site.register(
      Project,
      list_display=["title", "slug", "created_by", "created_at"],
      list_filter=["created_at", "created_by"],
      read_only_fields=["slug"],
      raw_id_fields=["created_by"],
      search_fields=["title"],
  )
  admin.site.register(
      Timeline,
      list_display=["project", "identifier", "media_type", "name", "created_by", "created_at"],
      list_filter=["project", "media_type", "created_at", "created_by"],
      raw_id_fields=["project", "created_by"],
      search_fields=["project__title", "name"]
  )
  admin.site.register(
      Event,
      list_display=["description", "created_by", "created_at"],
      list_filter=["created_at", "created_by"],
      search_fields=["description"]
  )
  admin.site.register(
      TimelineMapping,
      list_display=["created_by", "created_at"],
      list_filter=["timeline", "event", "created_at", "created_by"],
      search_fields=["timeline__name", "event__description", "timeline__project__title"],
      raw_id_fields=["timeline", "event"]
  )
  
subject: Add some admin