diff --git a/app/models/bookmark.rb b/app/models/bookmark.rb
index 35363b60d7e..e2f413bf13b 100644
--- a/app/models/bookmark.rb
+++ b/app/models/bookmark.rb
@@ -4,6 +4,8 @@ class Bookmark < ActiveRecord::Base
   # these columns were here for a very short amount of time,
   # hence the very short ignore time
   self.ignored_columns = [
+    "bookmarkable_id", # TODO 2022-04-01 remove
+    "bookmarkable_type", # TODO 2022-04-01 remove
     "topic_id", # TODO 2022-04-01: remove
     "reminder_type" # TODO 2021-04-01: remove
   ]
@@ -179,12 +181,9 @@ end
 #  auto_delete_preference :integer          default(0), not null
 #  pinned                 :boolean          default(FALSE)
 #  for_topic              :boolean          default(FALSE), not null
-#  bookmarkable_id        :integer
-#  bookmarkable_type      :string
 #
 # Indexes
 #
-#  idx_bookmarks_user_polymorphic_unique                 (user_id,bookmarkable_type,bookmarkable_id) UNIQUE
 #  index_bookmarks_on_post_id                            (post_id)
 #  index_bookmarks_on_reminder_at                        (reminder_at)
 #  index_bookmarks_on_reminder_set_at                    (reminder_set_at)
diff --git a/db/migrate/20220322024216_add_bookmark_polymorphic_columns_again.rb b/db/migrate/20220322024216_add_bookmark_polymorphic_columns_again.rb
deleted file mode 100644
index 0f4727f41e6..00000000000
--- a/db/migrate/20220322024216_add_bookmark_polymorphic_columns_again.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-# frozen_string_literal: true
-
-class AddBookmarkPolymorphicColumnsAgain < ActiveRecord::Migration[6.1]
-  def change
-    add_column :bookmarks, :bookmarkable_id, :integer
-    add_column :bookmarks, :bookmarkable_type, :string
-
-    add_index :bookmarks, [:user_id, :bookmarkable_type, :bookmarkable_id], name: "idx_bookmarks_user_polymorphic_unique", unique: true
-  end
-end