handler

type Math interface {
	Calculate(ctx context.Context, calculation *pb.Calculation) error
}

type Storage interface {
	CreateCalculation(ctx context.Context, owner, expression string) (*domain.Calculation, error)
	GetCalculation(ctx context.Context, id uint) (*domain.Calculation, error)
	GetCalculations(ctx context.Context) ([]*domain.Calculation, error)
	UpdateResult(ctx context.Context, id uint, result float64) error
}