diff --git a/db/migrate/20160227230233_add_attachment_avatar_to_accounts.rb b/db/migrate/20160227230233_add_attachment_avatar_to_accounts.rb
index 3666abf1cc..534df25eed 100644
--- a/db/migrate/20160227230233_add_attachment_avatar_to_accounts.rb
+++ b/db/migrate/20160227230233_add_attachment_avatar_to_accounts.rb
@@ -3,7 +3,11 @@
 class AddAttachmentAvatarToAccounts < ActiveRecord::Migration[4.2]
   def self.up
     change_table :accounts do |t|
-      t.attachment :avatar
+      # The following corresponds to `t.attachment :avatar` in an older version of Paperclip
+      t.string :avatar_file_name
+      t.string :avatar_content_type
+      t.integer :avatar_file_size
+      t.datetime :avatar_updated_at
     end
   end
 
diff --git a/db/migrate/20160312193225_add_attachment_header_to_accounts.rb b/db/migrate/20160312193225_add_attachment_header_to_accounts.rb
index 37108fc189..b481fc5290 100644
--- a/db/migrate/20160312193225_add_attachment_header_to_accounts.rb
+++ b/db/migrate/20160312193225_add_attachment_header_to_accounts.rb
@@ -3,7 +3,11 @@
 class AddAttachmentHeaderToAccounts < ActiveRecord::Migration[4.2]
   def self.up
     change_table :accounts do |t|
-      t.attachment :header
+      # The following corresponds to `t.attachment :header` in an older version of Paperclip
+      t.string :header_file_name
+      t.string :header_content_type
+      t.integer :header_file_size
+      t.datetime :header_updated_at
     end
   end
 
diff --git a/db/migrate/20160905150353_create_media_attachments.rb b/db/migrate/20160905150353_create_media_attachments.rb
index 3903a7b9a1..92680db9f3 100644
--- a/db/migrate/20160905150353_create_media_attachments.rb
+++ b/db/migrate/20160905150353_create_media_attachments.rb
@@ -4,7 +4,13 @@ class CreateMediaAttachments < ActiveRecord::Migration[5.0]
   def change
     create_table :media_attachments do |t|
       t.integer :status_id, null: true, default: nil
-      t.attachment :file
+
+      # The following corresponds to `t.attachment :file` in an older version of Paperclip
+      t.string :file_file_name
+      t.string :file_content_type
+      t.integer :file_file_size
+      t.datetime :file_updated_at
+
       t.string :remote_url, null: false, default: ''
       t.integer :account_id
 
diff --git a/db/migrate/20170330164118_add_attachment_data_to_imports.rb b/db/migrate/20170330164118_add_attachment_data_to_imports.rb
index 908d4da96a..0daaa9d02e 100644
--- a/db/migrate/20170330164118_add_attachment_data_to_imports.rb
+++ b/db/migrate/20170330164118_add_attachment_data_to_imports.rb
@@ -3,7 +3,11 @@
 class AddAttachmentDataToImports < ActiveRecord::Migration[4.2]
   def self.up
     change_table :imports do |t|
-      t.attachment :data
+      # The following corresponds to `t.attachment :data` in an older version of Paperclip
+      t.string :data_file_name
+      t.string :data_content_type
+      t.integer :data_file_size
+      t.datetime :data_updated_at
     end
   end
 
diff --git a/db/migrate/20170901141119_truncate_preview_cards.rb b/db/migrate/20170901141119_truncate_preview_cards.rb
index b4ba8c45ea..f251841f2e 100644
--- a/db/migrate/20170901141119_truncate_preview_cards.rb
+++ b/db/migrate/20170901141119_truncate_preview_cards.rb
@@ -8,7 +8,13 @@ class TruncatePreviewCards < ActiveRecord::Migration[5.1]
       t.string     :url, default: '', null: false, index: { unique: true }
       t.string     :title, default: '', null: false
       t.string     :description, default: '', null: false
-      t.attachment :image
+
+      # The following corresponds to `t.attachment :image` in an older version of Paperclip
+      t.string :image_file_name
+      t.string :image_content_type
+      t.integer :image_file_size
+      t.datetime :image_updated_at
+
       t.integer    :type, default: 0, null: false
       t.text       :html, default: '', null: false
       t.string     :author_name, default: '', null: false
diff --git a/db/migrate/20170913000752_create_site_uploads.rb b/db/migrate/20170913000752_create_site_uploads.rb
index 43a793806f..16a95ea013 100644
--- a/db/migrate/20170913000752_create_site_uploads.rb
+++ b/db/migrate/20170913000752_create_site_uploads.rb
@@ -4,7 +4,13 @@ class CreateSiteUploads < ActiveRecord::Migration[5.1]
   def change
     create_table :site_uploads do |t|
       t.string :var, default: '', null: false, index: { unique: true }
-      t.attachment :file
+
+      # The following corresponds to `t.attachment :file` in an older version of Paperclip
+      t.string :file_file_name
+      t.string :file_content_type
+      t.integer :file_file_size
+      t.datetime :file_updated_at
+
       t.json :meta
       t.timestamps
     end
diff --git a/db/migrate/20170917153509_create_custom_emojis.rb b/db/migrate/20170917153509_create_custom_emojis.rb
index 984fcd2181..dedc8cde80 100644
--- a/db/migrate/20170917153509_create_custom_emojis.rb
+++ b/db/migrate/20170917153509_create_custom_emojis.rb
@@ -5,7 +5,12 @@ class CreateCustomEmojis < ActiveRecord::Migration[5.1]
     create_table :custom_emojis do |t|
       t.string :shortcode, null: false, default: ''
       t.string :domain
-      t.attachment :image
+
+      # The following corresponds to `t.attachment :image` in an older version of Paperclip
+      t.string :image_file_name
+      t.string :image_content_type
+      t.integer :image_file_size
+      t.datetime :image_updated_at
 
       t.timestamps
     end
diff --git a/db/migrate/20200627125810_add_thumbnail_columns_to_media_attachments.rb b/db/migrate/20200627125810_add_thumbnail_columns_to_media_attachments.rb
index a3c6b55fd2..c11a24e8b5 100644
--- a/db/migrate/20200627125810_add_thumbnail_columns_to_media_attachments.rb
+++ b/db/migrate/20200627125810_add_thumbnail_columns_to_media_attachments.rb
@@ -2,7 +2,12 @@
 
 class AddThumbnailColumnsToMediaAttachments < ActiveRecord::Migration[5.2]
   def up
-    add_attachment :media_attachments, :thumbnail
+    # The following corresponds to `add_attachment :media_attachments, :thumbnail` in an older version of Paperclip
+    add_column :media_attachments, :thumbnail_file_name, :string
+    add_column :media_attachments, :thumbnail_content_type, :string
+    add_column :media_attachments, :thumbnail_file_size, :integer
+    add_column :media_attachments, :thumbnail_updated_at, :datetime
+
     add_column :media_attachments, :thumbnail_remote_url, :string
   end
 
diff --git a/db/post_migrate/20240307180905_migrate_devise_two_factor_secrets.rb b/db/post_migrate/20240307180905_migrate_devise_two_factor_secrets.rb
index 360e4806da..6194cf9ee3 100644
--- a/db/post_migrate/20240307180905_migrate_devise_two_factor_secrets.rb
+++ b/db/post_migrate/20240307180905_migrate_devise_two_factor_secrets.rb
@@ -18,7 +18,13 @@ class MigrateDeviseTwoFactorSecrets < ActiveRecord::Migration[7.1]
     users_with_otp_enabled.find_each do |user|
       # Gets the new value on already-updated users
       # Falls back to legacy value on not-yet-migrated users
-      otp_secret = user.otp_secret
+      otp_secret = begin
+        user.otp_secret
+      rescue OpenSSL::OpenSSLError
+        next if ENV['MIGRATION_IGNORE_INVALID_OTP_SECRET'] == 'true'
+
+        abort_with_decryption_error(user)
+      end
 
       Rails.logger.debug { "Processing #{user.email}" }
 
@@ -36,4 +42,22 @@ class MigrateDeviseTwoFactorSecrets < ActiveRecord::Migration[7.1]
   def users_with_otp_enabled
     MigrationUser.where(otp_required_for_login: true, otp_secret: nil)
   end
+
+  def abort_with_decryption_error(user)
+    abort <<~MESSAGE
+
+      ERROR: Unable to decrypt OTP secret for user #{user.id}.
+
+      This is most likely because you have changed the value of `OTP_SECRET` at some point in
+      time after the user configured 2FA.
+
+      In this case, their OTP secret had already been lost with the change to `OTP_SECRET`, and
+      proceeding with this migration will not make the situation worse.
+
+      Please double-check that you have not accidentally changed `OTP_SECRET` just for this
+      migration, and re-run the migration with `MIGRATION_IGNORE_INVALID_OTP_SECRET=true`.
+
+      Migration aborted.
+    MESSAGE
+  end
 end
diff --git a/spec/system/filters_spec.rb b/spec/system/filters_spec.rb
new file mode 100644
index 0000000000..9d18e90460
--- /dev/null
+++ b/spec/system/filters_spec.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'Filters' do
+  let(:user) { Fabricate(:user) }
+  let(:filter_title) { 'Filter of fun and games' }
+
+  before { sign_in(user) }
+
+  describe 'Creating a filter' do
+    it 'Populates a new filter from form' do
+      navigate_to_filters
+
+      click_on I18n.t('filters.new.title')
+      fill_in_filter_form
+      expect(page).to have_content(filter_title)
+    end
+  end
+
+  describe 'Editing an existing filter' do
+    let(:new_title) { 'Change title value' }
+
+    before { Fabricate :custom_filter, account: user.account, title: filter_title }
+
+    it 'Updates the saved filter' do
+      navigate_to_filters
+
+      click_on filter_title
+
+      fill_in filter_title_field, with: new_title
+      click_on I18n.t('generic.save_changes')
+
+      expect(page).to have_content(new_title)
+    end
+  end
+
+  describe 'Destroying an existing filter' do
+    before { Fabricate :custom_filter, account: user.account, title: filter_title }
+
+    it 'Deletes the filter' do
+      navigate_to_filters
+
+      expect(page).to have_content filter_title
+      expect do
+        click_on I18n.t('filters.index.delete')
+      end.to change(CustomFilter, :count).by(-1)
+
+      expect(page).to_not have_content(filter_title)
+    end
+  end
+
+  def navigate_to_filters
+    visit settings_path
+
+    click_on I18n.t('filters.index.title')
+    expect(page).to have_content I18n.t('filters.index.title')
+  end
+
+  def fill_in_filter_form
+    fill_in filter_title_field, with: filter_title
+    check I18n.t('filters.contexts.home')
+    within('.custom_filter_keywords_keyword') do
+      fill_in with: 'Keyword'
+    end
+    click_on I18n.t('filters.new.save')
+  end
+
+  def filter_title_field
+    I18n.t('simple_form.labels.defaults.title')
+  end
+end