model

type ChatMessage struct {
	ID        uint      `gorm:"primaryKey" json:"id"`
	UserID    uint      `gorm:"not null" json:"user_id"`
	Content   string    `gorm:"type:text;not null" json:"content"`
	Role      string    `gorm:"size:20;not null" json:"role"`
	CreatedAt time.Time `json:"created_at"`
}

type User struct {
	ID        uint      `gorm:"primaryKey" json:"id"`
	Username  string    `gorm:"size:50;not null;unique" json:"username"`
	Password  string    `gorm:"size:100;not null" json:"-"`
	Email     string    `gorm:"size:100;unique" json:"email"`
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}