FIX: rate limit user posts export

lib/guardian.rb

@@ -249,8 +249,10 @@ class Guardian
     @can_see_emails
   end
 
-  def can_export_admin_entity?(user)
-    user.staff?
+  def can_export_entity?(entity_type)
+    return true if is_staff?
+    return false if entity_type == "admin"
+    UserExport.where(user_id: @user.id, created_at: (Time.zone.now.beginning_of_day..Time.zone.now.end_of_day)).count == 0
   end
 
   private