Add migration to fill unset default quote policy based on default post privacy (#36041)

db/migrate/20250911163952_fill_default_quote_policy_setting.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class FillDefaultQuotePolicySetting < ActiveRecord::Migration[8.0]
+  disable_ddl_transaction!
+
+  # Dummy classes, to make migration possible across version changes
+  class User < ApplicationRecord; end
+
+  def up
+    User.where.not(settings: nil).find_each do |user|
+      settings = Oj.load(user.attributes_before_type_cast['settings'])
+      next if settings.nil?
+
+      should_update_settings = false
+
+      if settings['notification_emails.quote'].blank? && settings['notification_emails.reblog'] == false && settings['notification_emails.mention'] == false
+        settings['notification_emails.quote'] = false
+        should_update_settings = true
+      end
+
+      if settings['default_privacy'] == 'private' && settings['default_quote_policy'] != 'nobody'
+        settings['default_quote_policy'] = 'nobody'
+        should_update_settings = true
+      elsif settings['default_quote_policy'].nil? && settings['default_privacy'] == 'unlisted'
+        settings['default_quote_policy'] = 'followers'
+        should_update_settings = true
+      end
+
+      user.update_column('settings', Oj.dump(settings)) if should_update_settings
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_09_09_100506) do
+ActiveRecord::Schema[8.0].define(version: 2025_09_11_163952) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"