Fix old migration

db/migrate/20230215074425_move_emoji_reaction_settings.rb

@@ -7,21 +7,19 @@ class User < ApplicationRecord; end
     setting_visible_reactions: 'visible_reactions',
   }.freeze
 
-  class LegacySetting < ApplicationRecord
-    self.table_name = 'settings'
-
+  class Setting < ApplicationRecord
     def var
       self[:var]&.to_sym
     end
 
     def value
-      YAML.safe_load(self[:value], permitted_classes: [ActiveSupport::HashWithIndifferentAccess]) if self[:value].present?
+      YAML.safe_load(self[:value], permitted_classes: [ActiveSupport::HashWithIndifferentAccess, Symbol]) if self[:value].present?
     end
   end
 
   def up
     User.find_in_batches do |users|
-      previous_settings_for_batch = LegacySetting.where(thing_type: 'User', thing_id: users.map(&:id)).group_by(&:thing_id)
+      previous_settings_for_batch = Setting.where(thing_type: 'User', thing_id: users.map(&:id)).group_by(&:thing_id)
 
       users.each do |user|
         previous_settings = previous_settings_for_batch[user.id]&.index_by(&:var) || {}