feat: add email_send_log table to track email sends and registration status

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/service/user_service.go

@@ -21,12 +21,14 @@ import (
 )
 
 type UserService struct {
-	userDao *dao.UserDao
+	userDao         *dao.UserDao
+	emailSendLogDao *dao.EmailSendLogDao
 }
 
 func NewUserService() *UserService {
 	return &UserService{
-		userDao: dao.NewUserDao(),
+		userDao:         dao.NewUserDao(),
+		emailSendLogDao: dao.NewEmailSendLogDao(),
 	}
 }
 
@@ -141,6 +143,12 @@ func (svc *UserService) SendEmailVerifyCode(ctx context.Context, emailAddr strin
 	if cacheErr := cache.SetUserSendEmailLimit(ctx, emailAddr); cacheErr != nil {
 		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "set send email limit error", "error", cacheErr)
 	}
+
+	record := &dao.EmailSendLog{Email: emailAddr, Status: dao.EmailSendStatusSent}
+	if logErr := svc.emailSendLogDao.Create(dao.DB.WithContext(ctx), record); logErr != nil {
+		log.Error(ctx, "func", "SendEmailVerifyCode", "msg", "create email send log error", "error", logErr)
+	}
+
 	return nil
 }
 
@@ -156,7 +164,16 @@ func (svc *UserService) RegisterByEmail(ctx context.Context, emailAddr, password
 
 	_ = cache.DeleteUserEmailCode(ctx, emailAddr)
 
-	return svc.registerByEmailInternal(ctx, emailAddr, password)
+	uid, err = svc.registerByEmailInternal(ctx, emailAddr, password)
+	if err != nil {
+		return 0, err
+	}
+
+	if logErr := svc.emailSendLogDao.MarkRegistered(dao.DB.WithContext(ctx), emailAddr); logErr != nil {
+		log.Error(ctx, "func", "RegisterByEmail", "msg", "mark email send log registered error", "error", logErr)
+	}
+
+	return uid, nil
 }
 
 func (svc *UserService) registerByEmailInternal(ctx context.Context, emailAddr, password string) (uid int64, err error) {