Remove thing_type and thing_id columns from settings table (#31971)

db/migrate/20241205135901_remove_legacy_user_settings_data.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class RemoveLegacyUserSettingsData < ActiveRecord::Migration[7.2]
+  def up
+    connection.execute(<<~SQL.squish)
+      DELETE FROM settings
+      WHERE
+        thing_type IS NOT NULL
+        AND thing_id IS NOT NULL
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end