Remove IP tracking columns from users table (#16409)

app/serializers/rest/admin/account_serializer.rb

@@ -9,6 +9,7 @@ class REST::Admin::AccountSerializer < ActiveModel::Serializer
   attribute :created_by_application_id, if: :created_by_application?
   attribute :invited_by_account_id, if: :invited?
 
+  has_many :ips, serializer: REST::Admin::IpSerializer
   has_one :account, serializer: REST::AccountSerializer
 
   def id
@@ -19,10 +20,6 @@ class REST::Admin::AccountSerializer < ActiveModel::Serializer
     object.user_email
   end
 
-  def ip
-    object.user_current_sign_in_ip.to_s.presence
-  end
-
   def role
     object.user_role
   end
@@ -74,4 +71,12 @@ class REST::Admin::AccountSerializer < ActiveModel::Serializer
   def created_by_application?
     object.user&.created_by_application_id&.present?
   end
+
+  def ips
+    object.user&.ips
+  end
+
+  def ip
+    ips&.first
+  end
 end