add css for highliting a specific forum post

app/assets/stylesheets/specific/forum.css.scss

@@ -9,6 +9,10 @@ div.list-of-forum-posts {
     margin-bottom: 3em;
     word-wrap: break-word;
 
+    &:target {
+      background-color: #FFC;
+    }
+
     div.author {
       width: 12em;
       float: left;

app/models/forum_topic.rb

@@ -154,6 +154,10 @@ class ForumTopic < ActiveRecord::Base
     self.updater_id = CurrentUser.id
   end
 
+  def page_for(post_id)
+    (posts.where("id < ?", post_id).count / Danbooru.config.posts_per_page.to_f).ceil
+  end
+
   def last_page
     (response_count / Danbooru.config.posts_per_page.to_f).ceil
   end

app/models/post_archive.rb

@@ -74,7 +74,7 @@ class PostArchive < ActiveRecord::Base
         sqs_service.send_message(msg)
       end
 
-      def export_to_archives(version_id = 1451061)
+      def export_to_archives(version_id = 4394763)
         PostVersion.where("id > ?", version_id).find_each do |version|
           previous = version.previous
           tags = version.tags.scan(/\S+/)