buff2.0/docs/backfill_user_steam_account_limit.sql

/*
 ============================================================
 为已存在的用户回填 user_steam_account_limit 配置
 执行前请确保已创建表 user_steam_account_limit。
 仅为尚未在 user_steam_account_limit 中有记录的用户插入一条默认配置（max_steam_accounts = 3）。
 ============================================================
*/

SET NAMES utf8mb4;

-- 为所有未配置的用户插入默认 Steam 账号上限（3）
-- 仅插入 users 中 is_deleted = 0 且不在 user_steam_account_limit 中的 user_id
INSERT INTO `user_steam_account_limit` (`user_id`, `max_steam_accounts`, `created_at`, `updated_at`)
SELECT u.`id`, 3, NOW(), NOW()
FROM `users` u
LEFT JOIN `user_steam_account_limit` l ON l.`user_id` = u.`id`
WHERE (u.`is_deleted` = 0 OR u.`is_deleted` IS NULL)
  AND l.`user_id` IS NULL;