fix: keep ambiguous legacy phones unbound

auth/src/main/resources/db/auth-login-identifiers.sql

@@ -20,15 +20,18 @@ DROP PROCEDURE IF EXISTS auth_backfill_login_phone;
 DELIMITER $$
 CREATE PROCEDURE auth_backfill_login_phone()
 BEGIN
-  IF EXISTS (
-      SELECT user.phone
-        FROM baiyue_iam.iam_user user
-       WHERE user.deleted = 0 AND user.phone REGEXP '^1[3-9][0-9]{9}$'
-       GROUP BY user.phone HAVING COUNT(DISTINCT user.auth_user_id) > 1) THEN
-    SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'IAM 存在重复手机号，禁止建立 Auth 唯一登录索引';
-  END IF;
+  UPDATE auth_account
+     SET phone = NULL
+   WHERE phone IS NOT NULL AND phone NOT REGEXP '^1[3-9][0-9]{9}$';
   UPDATE auth_account account
   JOIN baiyue_iam.iam_user user ON user.auth_user_id = account.id AND user.deleted = 0
+  JOIN (
+    SELECT phone
+      FROM baiyue_iam.iam_user
+     WHERE deleted = 0 AND phone REGEXP '^1[3-9][0-9]{9}$'
+     GROUP BY phone
+    HAVING COUNT(DISTINCT auth_user_id) = 1
+  ) unique_phone ON unique_phone.phone = user.phone
      SET account.phone = user.phone
    WHERE account.phone IS NULL AND user.phone REGEXP '^1[3-9][0-9]{9}$';
   IF NOT EXISTS (