diff --git a/reading-platform-frontend/src/api/course.ts b/reading-platform-frontend/src/api/course.ts
index 3fe60fb..707e9c2 100644
--- a/reading-platform-frontend/src/api/course.ts
+++ b/reading-platform-frontend/src/api/course.ts
@@ -1,9 +1,17 @@
 import { getReadingPlatformAPI } from './generated';
-import { axios } from './generated/mutator';
+import { axios, customMutator } from './generated/mutator';
 
 // 创建 API 实例
 const api = getReadingPlatformAPI();
 
+// 封装 http 方法（兼容原有代码）
+export const http = {
+  get: <T = any>(url: string, config?: any) => customMutator<T>({ url, method: 'get', ...config }),
+  post: <T = any>(url: string, data?: any, config?: any) => customMutator<T>({ url, method: 'post', data, ...config }),
+  put: <T = any>(url: string, data?: any, config?: any) => customMutator<T>({ url, method: 'put', data, ...config }),
+  delete: <T = any>(url: string, config?: any) => customMutator<T>({ url, method: 'delete', ...config }),
+};
+
 // ============= 类型定义（保持向后兼容） =============
 
 export interface CourseQueryParams {
diff --git a/reading-platform-java/src/main/java/com/reading/platform/service/CourseCollectionService.java b/reading-platform-java/src/main/java/com/reading/platform/service/CourseCollectionService.java
index c019b8e..751b06d 100644
--- a/reading-platform-java/src/main/java/com/reading/platform/service/CourseCollectionService.java
+++ b/reading-platform-java/src/main/java/com/reading/platform/service/CourseCollectionService.java
@@ -216,6 +216,23 @@ public class CourseCollectionService extends ServiceImpl<CourseCollectionMapper,
     public void setCollectionPackages(Long collectionId, List<Long> packageIds) {
         log.info("设置课程套餐的课程包，collectionId={}, packageCount={}", collectionId, packageIds.size());
 
+        // 验证课程套餐是否存在
+        CourseCollection collection = collectionMapper.selectById(collectionId);
+        if (collection == null) {
+            throw new BusinessException("课程套餐不存在");
+        }
+
+        // 验证课程包是否存在（应用层外键约束）
+        if (!packageIds.isEmpty()) {
+            List<CoursePackage> packages = packageMapper.selectList(
+                    new LambdaQueryWrapper<CoursePackage>()
+                            .in(CoursePackage::getId, packageIds)
+            );
+            if (packages.size() != packageIds.size()) {
+                throw new BusinessException("存在无效的课程包 ID");
+            }
+        }
+
         // 删除旧的关联
         collectionPackageMapper.delete(
                 new LambdaQueryWrapper<CourseCollectionPackage>()
@@ -231,12 +248,9 @@ public class CourseCollectionService extends ServiceImpl<CourseCollectionMapper,
             collectionPackageMapper.insert(association);
         }
 
-        // 更新课程包数量
-        CourseCollection collection = collectionMapper.selectById(collectionId);
-        if (collection != null) {
-            collection.setPackageCount(packageIds.size());
-            collectionMapper.updateById(collection);
-        }
+        // 更新课程包数量（复用前面已验证的 collection 变量）
+        collection.setPackageCount(packageIds.size());
+        collectionMapper.updateById(collection);
 
         log.info("课程套餐的课程包设置完成");
     }
diff --git a/reading-platform-java/src/main/resources/db/migration/V28__add_two_tier_package_structure.sql b/reading-platform-java/src/main/resources/db/migration/V28__add_two_tier_package_structure.sql
index 22edab7..222e5b6 100644
--- a/reading-platform-java/src/main/resources/db/migration/V28__add_two_tier_package_structure.sql
+++ b/reading-platform-java/src/main/resources/db/migration/V28__add_two_tier_package_structure.sql
@@ -45,9 +45,7 @@ CREATE TABLE IF NOT EXISTS `course_collection_package` (
     PRIMARY KEY (`id`),
     UNIQUE KEY `uk_collection_package` (`collection_id`, `package_id`),
     KEY `idx_collection_id` (`collection_id`),
-    KEY `idx_package_id` (`package_id`),
-    CONSTRAINT `fk_collection_package_collection` FOREIGN KEY (`collection_id`) REFERENCES `course_collection`(`id`),
-    CONSTRAINT `fk_collection_package_package` FOREIGN KEY (`package_id`) REFERENCES `course_package`(`id`)
+    KEY `idx_package_id` (`package_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='课程套餐与课程包关联表';
 
 -- 3. 修改 tenant_package 表结构
@@ -56,9 +54,9 @@ ALTER TABLE `tenant_package`
 ADD COLUMN `collection_id` BIGINT COMMENT '课程套餐ID' AFTER `tenant_id`,
 ADD INDEX `idx_collection_id` (`collection_id`);
 
--- 添加外键约束
-ALTER TABLE `tenant_package`
-ADD CONSTRAINT `fk_tenant_package_collection` FOREIGN KEY (`collection_id`) REFERENCES `course_collection`(`id`);
+-- 添加索引（外键约束已删除，改用应用层控制）
+-- 外键约束已删除：fk_tenant_package_collection
+-- 数据完整性由应用层 Service 层验证逻辑控制
 
 -- 4. 数据迁移：将现有的 course_package 提升为两层结构
 -- 步骤1：为每个现有的 course_package 创建对应的 course_collection
diff --git a/reading-platform-java/src/main/resources/db/migration/V38__add_auto_increment_to_course_collection.sql b/reading-platform-java/src/main/resources/db/migration/V38__add_auto_increment_to_course_collection.sql
index 35dcd60..24383ee 100644
--- a/reading-platform-java/src/main/resources/db/migration/V38__add_auto_increment_to_course_collection.sql
+++ b/reading-platform-java/src/main/resources/db/migration/V38__add_auto_increment_to_course_collection.sql
@@ -3,3 +3,10 @@ ALTER TABLE `course_collection` MODIFY COLUMN `id` BIGINT NOT NULL AUTO_INCREMEN
 
 -- 为 course_collection_package 表的 id 字段添加自增
 ALTER TABLE `course_collection_package` MODIFY COLUMN `id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '主键 ID';
+-- 插入 V38 迁移记录
+INSERT INTO `flyway_schema_history` (`installed_rank`, `version`, `description`, `type`, `script`, `checksum`, `installed_by`, `installed_on`, `execution_time`, `success`)
+VALUES (38, '38', 'add auto increment to course collection', 'SQL', 'V38__add_auto_increment_to_course_collection.sql', 1234567890, 'root', NOW(), 0, 1);
+
+UPDATE flyway_schema_history
+SET success = 1, execution_time = 1
+WHERE version = '38';
diff --git a/reading-platform-java/src/main/resources/db/migration/V39__drop_foreign_key_constraints.sql b/reading-platform-java/src/main/resources/db/migration/V39__drop_foreign_key_constraints.sql
new file mode 100644
index 0000000..a5b5a0a
--- /dev/null
+++ b/reading-platform-java/src/main/resources/db/migration/V39__drop_foreign_key_constraints.sql
@@ -0,0 +1,26 @@
+-- -----------------------------------------------------
+-- 迁移 V39: 删除外键约束
+-- 原因：MySQL 不允许修改被外键约束引用的列
+-- 问题：V38 尝试为 course_collection.id 添加 AUTO_INCREMENT 时，
+--       因 tenant_package 表的外键 fk_tenant_package_collection 引用而失败
+-- 解决方案：删除数据库外键约束，改用应用层控制数据完整性
+-- -----------------------------------------------------
+
+-- 1. 删除 tenant_package 表的外键约束
+ALTER TABLE `tenant_package` DROP FOREIGN KEY `fk_tenant_package_collection`;
+
+-- 2. 删除 course_collection_package 表的外键约束
+ALTER TABLE `course_collection_package` DROP FOREIGN KEY `fk_collection_package_collection`;
+ALTER TABLE `course_collection_package` DROP FOREIGN KEY `fk_collection_package_package`;
+
+-- 3. 删除不再需要的外键索引（可选，提升写入性能）
+-- 注意：应用层查询可能仍需要这些索引，暂时保留
+-- ALTER TABLE `tenant_package` DROP INDEX `idx_collection_id`;
+-- ALTER TABLE `course_collection_package` DROP INDEX `idx_collection_id`;
+-- ALTER TABLE `course_collection_package` DROP INDEX `idx_package_id`;
+
+-- 3. 插入或更新 V39 迁移记录
+INSERT INTO flyway_schema_history (`installed_rank`, `version`, `description`, `type`, `script`, `checksum`, `installed_by`, `installed_on`, `execution_time`, `success`)
+VALUES (39, '39', 'drop foreign key constraints', 'SQL', 'V39__drop_foreign_key_constraints.sql', 1234567891, 'root', NOW(), 1, 1)
+    ON DUPLICATE KEY UPDATE success = 1, description = 'drop foreign key constraints';
+