优化打卡服务的创建逻辑，调整参数传递方式，简化用户ID的处理。同时，更新训练计划服务的返回结构，直接返回行数据以提升性能。

src/checkins/checkins.service.ts

@@ -18,11 +18,11 @@ export class CheckinsService {
     private readonly activityLogsService: ActivityLogsService,
   ) { }
 
-  async create(dto: CreateCheckinDto): Promise<CheckinResponseDto> {
+  async create(dto: CreateCheckinDto, userId: string): Promise<CheckinResponseDto> {
     // 检查是否已存在未删除的记录
     const existingRecord = await this.checkinModel.findOne({
       where: {
-        userId: dto.userId,
+        userId,
         workoutId: dto.workoutId || null,
         planId: dto.planId || null,
         checkinDate: dto.checkinDate || null,
@@ -30,12 +30,14 @@ export class CheckinsService {
       },
     });
 
+    // 存在则更新
     if (existingRecord) {
+      await this.update({ ...dto, id: existingRecord.id! }, userId);
       return { code: ResponseCode.SUCCESS, message: 'success', data: existingRecord.toJSON() };
     }
 
     const record = await this.checkinModel.create({
-      userId: dto.userId,
+      userId,
       workoutId: dto.workoutId || null,
       planId: dto.planId || null,
       title: dto.title || null,
@@ -47,7 +49,7 @@ export class CheckinsService {
     });
 
     await this.activityLogsService.record({
-      userId: record.userId,
+      userId,
       entityType: ActivityEntityType.CHECKIN,
       action: ActivityActionType.CREATE,
       entityId: record.id,