user

type Model struct {
	ID           int    `json:"id" bson:"_id"`
	Username     string `json:"username" bson:"username"`
	PasswordHash string `json:"passwordHash" bson:"password_hash"`
}

type Repository interface {
	Migrate() error
	FindByID(context.Context, int, *Model) error
	FindByUsername(context.Context, string, *Model) error
}

type Service interface {
	Authenticate(ctx context.Context, string, password string, user *Model) error
}