diff --git a/app/models/bookmark.rb b/app/models/bookmark.rb
index aa48363ac6a..54dc9534512 100644
--- a/app/models/bookmark.rb
+++ b/app/models/bookmark.rb
@@ -1,13 +1,6 @@
 # frozen_string_literal: true
 
 class Bookmark < ActiveRecord::Base
-  # these columns were here for a very short amount of time,
-  # hence the very short ignore time
-  self.ignored_columns = [
-    "topic_id", # TODO 2022-04-01: remove
-    "reminder_type" # TODO 2021-04-01: remove
-  ]
-
   cattr_accessor :registered_bookmarkables
   self.registered_bookmarkables = []
 
diff --git a/app/models/topic_timer.rb b/app/models/topic_timer.rb
index 2a9a690adef..5e80b5d4edd 100644
--- a/app/models/topic_timer.rb
+++ b/app/models/topic_timer.rb
@@ -3,10 +3,6 @@
 class TopicTimer < ActiveRecord::Base
   MAX_DURATION_MINUTES = 20.years.to_i / 60
 
-  self.ignored_columns = [
-    "duration" # TODO(2021-06-01): remove
-  ]
-
   include Trashable
 
   belongs_to :user
diff --git a/app/models/upload.rb b/app/models/upload.rb
index ff2aafa16e7..2ac393401cd 100644
--- a/app/models/upload.rb
+++ b/app/models/upload.rb
@@ -3,10 +3,6 @@
 require "digest/sha1"
 
 class Upload < ActiveRecord::Base
-  self.ignored_columns = [
-    "verified" # TODO(2020-12-10): remove
-  ]
-
   include ActionView::Helpers::NumberHelper
   include HasUrl