ALTER TABLE telegram_bot_settings
  ALTER COLUMN command_auto_delete_seconds SET DEFAULT 60;

-- The preceding migration introduced this setting with a disabled default.
-- Enable the requested cleanup for existing installations while retaining 0
-- as the explicit opt-out value in the administration UI.
UPDATE telegram_bot_settings
SET command_auto_delete_seconds = 60
WHERE singleton AND command_auto_delete_seconds = 0;