v0.27.1 Workaround for odd topic validation issue

gossamer_forums.rb

@@ -1,5 +1,5 @@
 # gossamer threads migration-import code
-# v0.27
+# v0.27.1
 
 require 'mysql2'
 require 'open-uri'
@@ -1098,7 +1098,11 @@ class GossamerForumsImporter < ImportScripts::Base
 #    end
     @db.execute("SELECT * FROM topic_last_post_time").each do |row|
       topic_id, last_post_time = row
-      Topic.find(topic_id).update!(
+# Validation error:     Topic.find(topic_id).update!(
+      topic = Topic.find(topic_id)
+
+      # Ensure we are only updating necessary fields
+      topic.update_columns(
         updated_at: Time.at(last_post_time),
         posts_count: fetch_db_topic_post_count(topic_id).to_i,
         last_posted_at: Time.at(last_post_time),