entity

type Balance struct {
	USD entity.USD
	BTC entity.BTC
}

type User struct {
	ID        uint64
	Name      string
	Username  string
	Email     *mail.Address
	Balance   Balance
	CreatedAt time.Time
	UpdatedAt time.Time
}

type UserRepository interface {
	Create(user *User) error
	Get(id uint64) (*User, error)
	// Update accept id of user, get it and pass in updFunc.
	// updFunc should update the user and return the updated user
	Update(
		id uint64, updFunc func(*User) (*User, error),
	) error
	Delete(id uint64) error
}