-- تعداد دعوت‌های هر معرف — AuthController::register → increment('total_referrals')
-- یک بار روی سرور: USE دیتابیس + بکاپ

START TRANSACTION;

SET @db = DATABASE();
SET @sql = IF(
    (SELECT COUNT(*) FROM information_schema.COLUMNS
        WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'customers' AND COLUMN_NAME = 'total_referrals') = 0,
    IF(
        (SELECT COUNT(*) FROM information_schema.COLUMNS
            WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'customers' AND COLUMN_NAME = 'referral_to_id') > 0,
        'ALTER TABLE `customers` ADD COLUMN `total_referrals` INT UNSIGNED NOT NULL DEFAULT 0 AFTER `referral_to_id`',
        'ALTER TABLE `customers` ADD COLUMN `total_referrals` INT UNSIGNED NOT NULL DEFAULT 0'
    ),
    'SELECT ''skip customers.total_referrals'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- هم‌تراز با تعداد ثبت‌نام‌های واقعی (اختیاری ولی توصیه می‌شود)
UPDATE `customers` AS c
SET c.`total_referrals` = (
  SELECT COUNT(*)
  FROM (
    SELECT `id`
    FROM `customers`
    WHERE `referral_to_id` = c.`referral_id`
      AND `deleted_at` IS NULL
  ) AS r
)
WHERE c.`referral_id` IS NOT NULL
  AND TRIM(c.`referral_id`) <> '';

COMMIT;