Add expiration/limited/reference icon on timeline

app/serializers/rest/status_serializer.rb

@@ -15,6 +15,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attribute :bookmarked, if: :current_user?
   attribute :pinned, if: :pinnable?
   attribute :reactions, if: :reactions?
+  attribute :expires_at, if: :will_expire?
   has_many :filtered, serializer: REST::FilterResultSerializer, if: :current_user?
 
   attribute :content, unless: :source_requested?
@@ -205,6 +206,14 @@ class REST::StatusSerializer < ActiveModel::Serializer
     object.active_mentions.to_a.sort_by(&:id)
   end
 
+  def will_expire?
+    object.scheduled_expiration_status.present?
+  end
+
+  def expires_at
+    object.scheduled_expiration_status.scheduled_at
+  end
+
   private
 
   def relationships