diff --git a/backend/docs/swagger.json b/backend/docs/swagger.json
index 89063ed..d0d438c 100644
--- a/backend/docs/swagger.json
+++ b/backend/docs/swagger.json
@@ -2008,6 +2008,9 @@
                 },
                 "id": {
                     "type": "string"
+                },
+                "prompt": {
+                    "type": "string"
                 }
             }
         },
@@ -2464,6 +2467,12 @@
         },
         "domain.RegisterReq": {
             "type": "object",
+            "required": [
+                "code",
+                "email",
+                "password",
+                "username"
+            ],
             "properties": {
                 "code": {
                     "description": "邀请码",
@@ -2476,6 +2485,10 @@
                 "password": {
                     "description": "密码",
                     "type": "string"
+                },
+                "username": {
+                    "description": "用户名",
+                    "type": "string"
                 }
             }
         },
diff --git a/backend/domain/billing.go b/backend/domain/billing.go
index 64bee84..6a9c2c7 100644
--- a/backend/domain/billing.go
+++ b/backend/domain/billing.go
@@ -87,6 +87,7 @@ func (c *CompletionRecord) From(e *db.Task) *CompletionRecord {
 
 type CompletionInfo struct {
 	ID        string `json:"id"`
+	Prompt    string `json:"prompt"`
 	Content   string `json:"content"`
 	CreatedAt int64  `json:"created_at"`
 }
@@ -96,6 +97,7 @@ func (c *CompletionInfo) From(e *db.Task) *CompletionInfo {
 		return c
 	}
 	c.ID = e.TaskID
+	c.Prompt = e.Prompt
 	c.Content = e.Completion
 	c.CreatedAt = e.CreatedAt.Unix()
 	return c
diff --git a/backend/domain/user.go b/backend/domain/user.go
index 45f811d..9854cb8 100644
--- a/backend/domain/user.go
+++ b/backend/domain/user.go
@@ -95,9 +95,10 @@ type ListReq struct {
 }
 
 type RegisterReq struct {
-	Email    string `json:"email"`    // 邮箱
-	Password string `json:"password"` // 密码
-	Code     string `json:"code"`     // 邀请码
+	Username string `json:"username" validate:"required"` // 用户名
+	Email    string `json:"email" validate:"required"`    // 邮箱
+	Password string `json:"password" validate:"required"` // 密码
+	Code     string `json:"code" validate:"required"`     // 邀请码
 }
 
 type ListLoginHistoryResp struct {
diff --git a/backend/internal/user/repo/user.go b/backend/internal/user/repo/user.go
index 825306e..34d46d4 100644
--- a/backend/internal/user/repo/user.go
+++ b/backend/internal/user/repo/user.go
@@ -74,6 +74,7 @@ func (r *UserRepo) CreateUser(ctx context.Context, user *db.User) (*db.User, err
 		SetEmail(user.Email).
 		SetPassword(user.Password).
 		SetStatus(user.Status).
+		SetPlatform(user.Platform).
 		Save(ctx)
 }
 
diff --git a/backend/internal/user/usecase/user.go b/backend/internal/user/usecase/user.go
index aac64f1..ff936cc 100644
--- a/backend/internal/user/usecase/user.go
+++ b/backend/internal/user/usecase/user.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"log/slog"
 	"net/url"
-	"strings"
 	"time"
 
 	"github.com/google/uuid"
@@ -136,14 +135,12 @@ func (u *UserUsecase) Register(ctx context.Context, req *domain.RegisterReq) (*d
 	if err != nil {
 		return nil, err
 	}
-	parts := strings.Split(req.Email, "@")
-	if len(parts) != 2 {
-		return nil, errcode.ErrEmailInvalid
-	}
 	user := &db.User{
-		Username: parts[0],
+		Username: req.Username,
 		Email:    req.Email,
 		Password: string(hash),
+		Status:   consts.UserStatusActive,
+		Platform: consts.UserPlatformEmail,
 	}
 	n, err := u.repo.CreateUser(ctx, user)
 	if err != nil {