diff --git a/db/migrate/20170716191202_add_hide_notifications_to_mute.rb b/db/migrate/20170716191202_add_hide_notifications_to_mute.rb
index b817d512d..2ef5d2579 100644
--- a/db/migrate/20170716191202_add_hide_notifications_to_mute.rb
+++ b/db/migrate/20170716191202_add_hide_notifications_to_mute.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddHideNotificationsToMute < ActiveRecord::Migration[5.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    add_column_with_default :mutes, :hide_notifications, :boolean, default: true, allow_null: false
+    add_column :mutes, :hide_notifications, :boolean, default: true, null: false
   end
 
   def down
diff --git a/db/migrate/20171005171936_add_disabled_to_custom_emojis.rb b/db/migrate/20171005171936_add_disabled_to_custom_emojis.rb
index d6fd228f9..eaf5f4ef2 100644
--- a/db/migrate/20171005171936_add_disabled_to_custom_emojis.rb
+++ b/db/migrate/20171005171936_add_disabled_to_custom_emojis.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddDisabledToCustomEmojis < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :custom_emojis, :disabled, :bool, default: false }
+    safety_assured { add_column :custom_emojis, :disabled, :bool, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20171028221157_add_reblogs_to_follows.rb b/db/migrate/20171028221157_add_reblogs_to_follows.rb
index 0dab84c79..068d66d1d 100644
--- a/db/migrate/20171028221157_add_reblogs_to_follows.rb
+++ b/db/migrate/20171028221157_add_reblogs_to_follows.rb
@@ -1,16 +1,12 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddReblogsToFollows < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :follows, :show_reblogs, :boolean, default: true, allow_null: false
-      add_column_with_default :follow_requests, :show_reblogs, :boolean, default: true, allow_null: false
+      add_column :follows, :show_reblogs, :boolean, default: true, null: false
+      add_column :follow_requests, :show_reblogs, :boolean, default: true, null: false
     end
   end
 
diff --git a/db/migrate/20171107143332_add_memorial_to_accounts.rb b/db/migrate/20171107143332_add_memorial_to_accounts.rb
index 3cf782b81..35a98f45e 100644
--- a/db/migrate/20171107143332_add_memorial_to_accounts.rb
+++ b/db/migrate/20171107143332_add_memorial_to_accounts.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddMemorialToAccounts < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :accounts, :memorial, :bool, default: false }
+    safety_assured { add_column :accounts, :memorial, :bool, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20171107143624_add_disabled_to_users.rb b/db/migrate/20171107143624_add_disabled_to_users.rb
index 4ab4df737..055d05b10 100644
--- a/db/migrate/20171107143624_add_disabled_to_users.rb
+++ b/db/migrate/20171107143624_add_disabled_to_users.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddDisabledToUsers < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :users, :disabled, :bool, default: false }
+    safety_assured { add_column :users, :disabled, :bool, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20171109012327_add_moderator_to_accounts.rb b/db/migrate/20171109012327_add_moderator_to_accounts.rb
index e8fc313c8..6a29e5aaf 100644
--- a/db/migrate/20171109012327_add_moderator_to_accounts.rb
+++ b/db/migrate/20171109012327_add_moderator_to_accounts.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddModeratorToAccounts < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :users, :moderator, :bool, default: false }
+    safety_assured { add_column :users, :moderator, :bool, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20171130000000_add_embed_url_to_preview_cards.rb b/db/migrate/20171130000000_add_embed_url_to_preview_cards.rb
index e78373b24..f2336e8e2 100644
--- a/db/migrate/20171130000000_add_embed_url_to_preview_cards.rb
+++ b/db/migrate/20171130000000_add_embed_url_to_preview_cards.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddEmbedURLToPreviewCards < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :preview_cards, :embed_url, :string, default: '', allow_null: false
+      add_column :preview_cards, :embed_url, :string, default: '', null: false
     end
   end
 
diff --git a/db/migrate/20180615122121_add_autofollow_to_invites.rb b/db/migrate/20180615122121_add_autofollow_to_invites.rb
index ef129003a..19a5f0d17 100644
--- a/db/migrate/20180615122121_add_autofollow_to_invites.rb
+++ b/db/migrate/20180615122121_add_autofollow_to_invites.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddAutofollowToInvites < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :invites, :autofollow, :bool, default: false, allow_null: false
+      add_column :invites, :autofollow, :bool, default: false, null: false
     end
   end
 
diff --git a/db/migrate/20180707154237_add_whole_word_to_custom_filter.rb b/db/migrate/20180707154237_add_whole_word_to_custom_filter.rb
index 793c3e6cf..519dfdfae 100644
--- a/db/migrate/20180707154237_add_whole_word_to_custom_filter.rb
+++ b/db/migrate/20180707154237_add_whole_word_to_custom_filter.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddWholeWordToCustomFilter < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def change
     safety_assured do
-      add_column_with_default :custom_filters, :whole_word, :boolean, default: true, allow_null: false
+      add_column :custom_filters, :whole_word, :boolean, default: true, null: false
     end
   end
 
diff --git a/db/migrate/20180814171349_add_confidential_to_doorkeeper_application.rb b/db/migrate/20180814171349_add_confidential_to_doorkeeper_application.rb
index 7360c71ac..6544b81c8 100644
--- a/db/migrate/20180814171349_add_confidential_to_doorkeeper_application.rb
+++ b/db/migrate/20180814171349_add_confidential_to_doorkeeper_application.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddConfidentialToDoorkeeperApplication < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :oauth_applications,
         :confidential,
         :boolean,
-        allow_null: false,
+        null: false,
         default: true # maintaining backwards compatibility: require secrets
       )
     end
diff --git a/db/migrate/20181010141500_add_silent_to_mentions.rb b/db/migrate/20181010141500_add_silent_to_mentions.rb
index f9bfc5169..029119e79 100644
--- a/db/migrate/20181010141500_add_silent_to_mentions.rb
+++ b/db/migrate/20181010141500_add_silent_to_mentions.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddSilentToMentions < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :mentions,
         :silent,
         :boolean,
-        allow_null: false,
+        null: false,
         default: false
       )
     end
diff --git a/db/migrate/20181017170937_add_reject_reports_to_domain_blocks.rb b/db/migrate/20181017170937_add_reject_reports_to_domain_blocks.rb
index b6cfd31d2..49bd2b02f 100644
--- a/db/migrate/20181017170937_add_reject_reports_to_domain_blocks.rb
+++ b/db/migrate/20181017170937_add_reject_reports_to_domain_blocks.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddRejectReportsToDomainBlocks < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :domain_blocks, :reject_reports, :boolean, default: false, allow_null: false
+      add_column :domain_blocks, :reject_reports, :boolean, default: false, null: false
     end
   end
 
diff --git a/db/migrate/20181018205649_add_unread_to_account_conversations.rb b/db/migrate/20181018205649_add_unread_to_account_conversations.rb
index fec947639..ae4576255 100644
--- a/db/migrate/20181018205649_add_unread_to_account_conversations.rb
+++ b/db/migrate/20181018205649_add_unread_to_account_conversations.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddUnreadToAccountConversations < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :account_conversations,
         :unread,
         :boolean,
-        allow_null: false,
+        null: false,
         default: false
       )
     end
diff --git a/db/migrate/20181127165847_add_show_replies_to_lists.rb b/db/migrate/20181127165847_add_show_replies_to_lists.rb
index 45d457b74..a391d9f6f 100644
--- a/db/migrate/20181127165847_add_show_replies_to_lists.rb
+++ b/db/migrate/20181127165847_add_show_replies_to_lists.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddShowRepliesToLists < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :lists,
         :replies_policy,
         :integer,
-        allow_null: false,
+        null: false,
         default: 0
       )
     end
diff --git a/db/migrate/20190201012802_add_overwrite_to_imports.rb b/db/migrate/20190201012802_add_overwrite_to_imports.rb
index fe9423ed0..b497950ee 100644
--- a/db/migrate/20190201012802_add_overwrite_to_imports.rb
+++ b/db/migrate/20190201012802_add_overwrite_to_imports.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddOverwriteToImports < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :imports, :overwrite, :boolean, default: false, allow_null: false
+      add_column :imports, :overwrite, :boolean, default: false, null: false
     end
   end
 
diff --git a/db/migrate/20190306145741_add_lock_version_to_polls.rb b/db/migrate/20190306145741_add_lock_version_to_polls.rb
index 760818d97..ec4430ea9 100644
--- a/db/migrate/20190306145741_add_lock_version_to_polls.rb
+++ b/db/migrate/20190306145741_add_lock_version_to_polls.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddLockVersionToPolls < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :polls,
         :lock_version,
         :integer,
-        allow_null: false,
+        null: false,
         default: 0
       )
     end
diff --git a/db/migrate/20190307234537_add_approved_to_users.rb b/db/migrate/20190307234537_add_approved_to_users.rb
index 9abab29c9..ffdc24716 100644
--- a/db/migrate/20190307234537_add_approved_to_users.rb
+++ b/db/migrate/20190307234537_add_approved_to_users.rb
@@ -1,19 +1,15 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddApprovedToUsers < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default(
+      add_column(
         :users,
         :approved,
         :bool,
-        allow_null: false,
+        null: false,
         default: true
       )
     end
diff --git a/db/migrate/20191001213028_add_lock_version_to_account_stats.rb b/db/migrate/20191001213028_add_lock_version_to_account_stats.rb
index 0dc165559..3ffbacf25 100644
--- a/db/migrate/20191001213028_add_lock_version_to_account_stats.rb
+++ b/db/migrate/20191001213028_add_lock_version_to_account_stats.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddLockVersionToAccountStats < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :account_stats, :lock_version, :integer, allow_null: false, default: 0 }
+    safety_assured { add_column :account_stats, :lock_version, :integer, null: false, default: 0 }
   end
 
   def down
diff --git a/db/migrate/20200312144258_add_title_to_account_warning_presets.rb b/db/migrate/20200312144258_add_title_to_account_warning_presets.rb
index 78b854f82..63d339c49 100644
--- a/db/migrate/20200312144258_add_title_to_account_warning_presets.rb
+++ b/db/migrate/20200312144258_add_title_to_account_warning_presets.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddTitleToAccountWarningPresets < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :account_warning_presets, :title, :string, default: '', allow_null: false }
+    safety_assured { add_column :account_warning_presets, :title, :string, default: '', null: false }
   end
 
   def down
diff --git a/db/migrate/20200917192924_add_notify_to_follows.rb b/db/migrate/20200917192924_add_notify_to_follows.rb
index a57bb36dc..1dc831dc4 100644
--- a/db/migrate/20200917192924_add_notify_to_follows.rb
+++ b/db/migrate/20200917192924_add_notify_to_follows.rb
@@ -1,16 +1,12 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddNotifyToFollows < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :follows, :notify, :boolean, default: false, allow_null: false
-      add_column_with_default :follow_requests, :notify, :boolean, default: false, allow_null: false
+      add_column :follows, :notify, :boolean, default: false, null: false
+      add_column :follow_requests, :notify, :boolean, default: false, null: false
     end
   end
 
diff --git a/db/migrate/20201218054746_add_obfuscate_to_domain_blocks.rb b/db/migrate/20201218054746_add_obfuscate_to_domain_blocks.rb
index 91bba38c5..d7038c83d 100644
--- a/db/migrate/20201218054746_add_obfuscate_to_domain_blocks.rb
+++ b/db/migrate/20201218054746_add_obfuscate_to_domain_blocks.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddObfuscateToDomainBlocks < ActiveRecord::Migration[5.2]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :domain_blocks, :obfuscate, :boolean, default: false, allow_null: false }
+    safety_assured { add_column :domain_blocks, :obfuscate, :boolean, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20211231080958_add_category_to_reports.rb b/db/migrate/20211231080958_add_category_to_reports.rb
index f114cda61..a20a3155d 100644
--- a/db/migrate/20211231080958_add_category_to_reports.rb
+++ b/db/migrate/20211231080958_add_category_to_reports.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddCategoryToReports < ActiveRecord::Migration[6.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :reports, :category, :int, default: 0, allow_null: false
+      add_column :reports, :category, :int, default: 0, null: false
       change_table(:reports, bulk: true) do |t|
         t.column :action_taken_at, :datetime
         t.column :rule_ids, :bigint, array: true
diff --git a/db/migrate/20220613110834_add_action_to_custom_filters.rb b/db/migrate/20220613110834_add_action_to_custom_filters.rb
index c1daf3c94..ab2f7c65e 100644
--- a/db/migrate/20220613110834_add_action_to_custom_filters.rb
+++ b/db/migrate/20220613110834_add_action_to_custom_filters.rb
@@ -1,15 +1,11 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddActionToCustomFilters < ActiveRecord::Migration[6.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
     safety_assured do
-      add_column_with_default :custom_filters, :action, :integer, allow_null: false, default: 0
+      add_column :custom_filters, :action, :integer, null: false, default: 0
       execute 'UPDATE custom_filters SET action = 1 WHERE irreversible IS TRUE'
     end
   end
diff --git a/db/migrate/20230605085710_add_exclusive_to_lists.rb b/db/migrate/20230605085710_add_exclusive_to_lists.rb
index 315c9d487..abcb8fae1 100644
--- a/db/migrate/20230605085710_add_exclusive_to_lists.rb
+++ b/db/migrate/20230605085710_add_exclusive_to_lists.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddExclusiveToLists < ActiveRecord::Migration[6.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :lists, :exclusive, :boolean, default: false, allow_null: false }
+    safety_assured { add_column :lists, :exclusive, :boolean, default: false, null: false }
   end
 
   def down
diff --git a/db/migrate/20230725213448_add_image_description_to_preview_cards.rb b/db/migrate/20230725213448_add_image_description_to_preview_cards.rb
index 03020db65..7445a0e7f 100644
--- a/db/migrate/20230725213448_add_image_description_to_preview_cards.rb
+++ b/db/migrate/20230725213448_add_image_description_to_preview_cards.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddImageDescriptionToPreviewCards < ActiveRecord::Migration[7.0]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :preview_cards, :image_description, :string, default: '', allow_null: false }
+    safety_assured { add_column :preview_cards, :image_description, :string, default: '', null: false }
   end
 
   def down
diff --git a/db/migrate/20230814223300_add_indexable_to_accounts.rb b/db/migrate/20230814223300_add_indexable_to_accounts.rb
index 6729c05ef..0544eb92f 100644
--- a/db/migrate/20230814223300_add_indexable_to_accounts.rb
+++ b/db/migrate/20230814223300_add_indexable_to_accounts.rb
@@ -1,14 +1,10 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class AddIndexableToAccounts < ActiveRecord::Migration[7.0]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
-    safety_assured { add_column_with_default :accounts, :indexable, :boolean, default: false, allow_null: false }
+    safety_assured { add_column :accounts, :indexable, :boolean, default: false, null: false }
   end
 
   def down
diff --git a/db/post_migrate/20220613110802_remove_whole_word_from_custom_filters.rb b/db/post_migrate/20220613110802_remove_whole_word_from_custom_filters.rb
index 99c3366a2..5e477d9b1 100644
--- a/db/post_migrate/20220613110802_remove_whole_word_from_custom_filters.rb
+++ b/db/post_migrate/20220613110802_remove_whole_word_from_custom_filters.rb
@@ -1,10 +1,6 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class RemoveWholeWordFromCustomFilters < ActiveRecord::Migration[6.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
@@ -15,7 +11,7 @@ class RemoveWholeWordFromCustomFilters < ActiveRecord::Migration[6.1]
 
   def down
     safety_assured do
-      add_column_with_default :custom_filters, :whole_word, :boolean, default: true, allow_null: false
+      add_column :custom_filters, :whole_word, :boolean, default: true, null: false
     end
   end
 end
diff --git a/db/post_migrate/20220613110903_remove_irreversible_from_custom_filters.rb b/db/post_migrate/20220613110903_remove_irreversible_from_custom_filters.rb
index 1c366ee53..1ed009fe9 100644
--- a/db/post_migrate/20220613110903_remove_irreversible_from_custom_filters.rb
+++ b/db/post_migrate/20220613110903_remove_irreversible_from_custom_filters.rb
@@ -1,10 +1,6 @@
 # frozen_string_literal: true
 
-require Rails.root.join('lib', 'mastodon', 'migration_helpers')
-
 class RemoveIrreversibleFromCustomFilters < ActiveRecord::Migration[6.1]
-  include Mastodon::MigrationHelpers
-
   disable_ddl_transaction!
 
   def up
@@ -15,7 +11,7 @@ class RemoveIrreversibleFromCustomFilters < ActiveRecord::Migration[6.1]
 
   def down
     safety_assured do
-      add_column_with_default :custom_filters, :irreversible, :boolean, allow_null: false, default: false
+      add_column :custom_filters, :irreversible, :boolean, null: false, default: false
     end
   end
 end
diff --git a/lib/mastodon/migration_helpers.rb b/lib/mastodon/migration_helpers.rb
index 7bc129883..1a2ce6420 100644
--- a/lib/mastodon/migration_helpers.rb
+++ b/lib/mastodon/migration_helpers.rb
@@ -104,18 +104,7 @@ module Mastodon
             'in the body of your migration class'
         end
 
-        # If default value is presented, use `add_column_with_default` method instead.
-        if options[:default]
-          add_column_with_default(
-            table_name,
-            column_name,
-            :datetime_with_timezone,
-            default: options[:default],
-            allow_null: options[:null]
-          )
-        else
-          add_column(table_name, column_name, :datetime_with_timezone, **options)
-        end
+        add_column(table_name, column_name, :datetime_with_timezone, **options)
       end
     end
 
@@ -377,34 +366,6 @@ module Mastodon
       end
     end
 
-    # Adds a column with a default value without locking an entire table.
-    #
-    # This method runs the following steps:
-    #
-    # 1. Add the column with a default value of NULL.
-    # 2. Change the default value of the column to the specified value.
-    # 3. Update all existing rows in batches.
-    # 4. Set a `NOT NULL` constraint on the column if desired (the default).
-    #
-    # These steps ensure a column can be added to a large and commonly used
-    # table without locking the entire table for the duration of the table
-    # modification.
-    #
-    # table - The name of the table to update.
-    # column - The name of the column to add.
-    # type - The column type (e.g. `:integer`).
-    # default - The default value for the column.
-    # limit - Sets a column limit. For example, for :integer, the default is
-    #         4-bytes. Set `limit: 8` to allow 8-byte integers.
-    # allow_null - When set to `true` the column will allow NULL values, the
-    #              default is to not allow NULL values.
-    #
-    # This method can also take a block which is passed directly to the
-    # `update_column_in_batches` method.
-    def add_column_with_default(table, column, type, default:, limit: nil, allow_null: false, &block)
-      add_column(table, column, type, default: default, limit: limit, null: allow_null)
-    end
-
     # Renames a column without requiring downtime.
     #
     # Concurrent renames work by using database triggers to ensure both the