old_contents: from django.contrib import admin
  import stocksApi
  
  # Register your models here.
  
  @admin.register(stocksApi.models.AndroidToken)
  class AndroidTokenAdmin(admin.ModelAdmin):
      fields = ("user", "token")
      actions = [stocksApi.models.AndroidToken.ping]
  
  @admin.register(stocksApi.models.SessionId)
  class SessionIdAdmin(admin.ModelAdmin):
      fields = ("id_string", "associated_user", "exp_date")
      actions = []
  
new_contents: from django.contrib import admin
  import stocksApi
  
  def deleteAllSessionIds(admin, request, queryset):
      stocksApi.models.SessionId.objects.all().delete()
  deleteAllSessionIds.short_description = "Delete all session ids"
  # Register your models here.
  
  @admin.register(stocksApi.models.AndroidToken)
  class AndroidTokenAdmin(admin.ModelAdmin):
      fields = ("user", "token")
      actions = [stocksApi.models.AndroidToken.ping]
  
  @admin.register(stocksApi.models.SessionId)
  class SessionIdAdmin(admin.ModelAdmin):
      fields = ("id_string", "associated_user", "exp_date")
      actions = [deleteAllSessionIds]
  
subject: Improve admin