增加自动迁移数据表代码

api/store/model/invite_code.go

@@ -3,10 +3,14 @@ package model
 import "time"
 
 type InviteCode struct {
-	Id        uint `gorm:"primarykey;column:id"`
-	UserId    uint
-	Code      string
-	Hits      int // 点击次数
-	RegNum    int // 注册人数
-	CreatedAt time.Time
+	Id        uint       `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	UserId    uint       `gorm:"column:user_id;type:int;not null;comment:用户ID" json:"user_id"`
+	Code      string    `gorm:"column:code;type:char(8);uniqueIndex;not null;comment:邀请码" json:"code"`
+	Hits      int       `gorm:"column:hits;type:int;not null;comment:点击次数" json:"hits"`
+	RegNum    int       `gorm:"column:reg_num;type:smallint;not null;comment:注册数量" json:"reg_num"`
+	CreatedAt time.Time `gorm:"column:created_at;type:datetime;not null" json:"created_at"`
+}
+
+func (m *InviteCode) TableName() string {
+	return "chatgpt_invite_codes"
 }