diff --git a/database/sql/schema.sql b/database/sql/schema.sql
index 8db508d..c9ac9e9 100644
--- a/database/sql/schema.sql
+++ b/database/sql/schema.sql
@@ -1,4 +1,37 @@
--- Create admins table
+-- 禁用外鍵檢查以避免在刪除表格時出現外鍵依賴問題
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ===========================
+-- 1. 刪除外鍵約束（如果存在）
+-- ===========================
+
+-- 刪除 `clients` 表的外鍵約束
+ALTER TABLE `clients` DROP FOREIGN KEY IF EXISTS `clients_llm_provider_id_foreign`;
+
+-- 刪除 `auth_tokens` 表的外鍵約束
+ALTER TABLE `auth_tokens` DROP FOREIGN KEY IF EXISTS `auth_tokens_client_id_foreign`;
+
+-- 刪除 `admin_client` 表的外鍵約束
+ALTER TABLE `admin_client` DROP FOREIGN KEY IF EXISTS `admin_client_admin_id_foreign`;
+ALTER TABLE `admin_client` DROP FOREIGN KEY IF EXISTS `admin_client_client_id_foreign`;
+
+-- ===========================
+-- 2. 刪除表格（如果存在）
+-- ===========================
+
+-- 按照依賴順序刪除表格
+DROP TABLE IF EXISTS `admin_client`;
+DROP TABLE IF EXISTS `auth_tokens`;
+DROP TABLE IF EXISTS `clients`;
+DROP TABLE IF EXISTS `llm_providers`;
+DROP TABLE IF EXISTS `admins`;
+DROP TABLE IF EXISTS `operation_logs`;
+
+-- ===========================
+-- 3. 創建表格
+-- ===========================
+
+-- 創建 `admins` 表
 CREATE TABLE `admins` (
     `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
     `username` VARCHAR(50) NOT NULL,
@@ -12,7 +45,7 @@ CREATE TABLE `admins` (
     KEY `admins_email_index` (`email`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- Create llm_providers table
+-- 創建 `llm_providers` 表
 CREATE TABLE `llm_providers` (
     `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
     `name` VARCHAR(100) NOT NULL,
@@ -28,7 +61,7 @@ CREATE TABLE `llm_providers` (
     KEY `llm_providers_status_index` (`status`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- Create clients table
+-- 創建 `clients` 表
 CREATE TABLE `clients` (
     `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
     `name` VARCHAR(100) NOT NULL,
@@ -45,7 +78,7 @@ CREATE TABLE `clients` (
         REFERENCES `llm_providers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- Create auth_tokens table
+-- 創建 `auth_tokens` 表
 CREATE TABLE `auth_tokens` (
     `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
     `client_id` BIGINT UNSIGNED NOT NULL,
@@ -60,7 +93,7 @@ CREATE TABLE `auth_tokens` (
         REFERENCES `clients` (`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- Create admin_client table (pivot table)
+-- 創建 `admin_client` 表（聯接表）
 CREATE TABLE `admin_client` (
     `admin_id` BIGINT UNSIGNED NOT NULL,
     `client_id` BIGINT UNSIGNED NOT NULL,
@@ -74,7 +107,7 @@ CREATE TABLE `admin_client` (
         REFERENCES `clients` (`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- Create operation_logs table
+-- 創建 `operation_logs` 表
 CREATE TABLE `operation_logs` (
     `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
     `user_type` ENUM('admin', 'client') NOT NULL,
@@ -85,3 +118,6 @@ CREATE TABLE `operation_logs` (
     PRIMARY KEY (`id`),
     KEY `operation_logs_user_type_user_id_index` (`user_type`, `user_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 啟用外鍵檢查
+SET FOREIGN_KEY_CHECKS = 1;