Problem with tds_ecto and float performance

create.sql

/****** Object:  Table [dbo].[SQLDBTable]    Script Date: 01/09/2015 17:43:03 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[SQLDBTable](
	[Ano] [smallint] NOT NULL,
	[Description] [nvarchar](20) NOT NULL,
	[Note] [nvarchar](3) NOT NULL,
	[FField00Plus] [money] NULL CONSTRAINT [SQLDBTable_FField00Plus_DF]  DEFAULT ((0)),
	[FField01Plus] [money] NULL CONSTRAINT [SQLDBTable_FField01Plus_DF]  DEFAULT ((0)),
	[FField02Plus] [money] NULL CONSTRAINT [SQLDBTable_FField02Plus_DF]  DEFAULT ((0)),
	[FField03Plus] [money] NULL CONSTRAINT [SQLDBTable_FField03Plus_DF]  DEFAULT ((0)),
	[FField04Plus] [money] NULL CONSTRAINT [SQLDBTable_FField04Plus_DF]  DEFAULT ((0)),
	[FField05Plus] [money] NULL CONSTRAINT [SQLDBTable_FField05Plus_DF]  DEFAULT ((0)),
	[FField06Plus] [money] NULL CONSTRAINT [SQLDBTable_FField06Plus_DF]  DEFAULT ((0)),
	[FField07Plus] [money] NULL CONSTRAINT [SQLDBTable_FField07Plus_DF]  DEFAULT ((0)),
	[FField08Plus] [money] NULL CONSTRAINT [SQLDBTable_FField08Plus_DF]  DEFAULT ((0)),
	[FField09Plus] [money] NULL CONSTRAINT [SQLDBTable_FField09Plus_DF]  DEFAULT ((0)),
	[FField10Plus] [money] NULL CONSTRAINT [SQLDBTable_FField10Plus_DF]  DEFAULT ((0)),
	[FField11Plus] [money] NULL CONSTRAINT [SQLDBTable_FField11Plus_DF]  DEFAULT ((0)),
	[FField12Plus] [money] NULL CONSTRAINT [SQLDBTable_FField12Plus_DF]  DEFAULT ((0)),
	[FField13Plus] [money] NULL CONSTRAINT [SQLDBTable_FField13Plus_DF]  DEFAULT ((0)),
	[FField14Plus] [money] NULL CONSTRAINT [SQLDBTable_FField14Plus_DF]  DEFAULT ((0)),
	[FField15Plus] [money] NULL CONSTRAINT [SQLDBTable_FField15Plus_DF]  DEFAULT ((0)),
	[FField00Minus] [money] NULL CONSTRAINT [SQLDBTable_FField00Minus_DF]  DEFAULT ((0)),
	[FField01Minus] [money] NULL CONSTRAINT [SQLDBTable_FField01Minus_DF]  DEFAULT ((0)),
	[FField02Minus] [money] NULL CONSTRAINT [SQLDBTable_FField02Minus_DF]  DEFAULT ((0)),
	[FField03Minus] [money] NULL CONSTRAINT [SQLDBTable_FField03Minus_DF]  DEFAULT ((0)),
	[FField04Minus] [money] NULL CONSTRAINT [SQLDBTable_FField04Minus_DF]  DEFAULT ((0)),
	[FField05Minus] [money] NULL CONSTRAINT [SQLDBTable_FField05Minus_DF]  DEFAULT ((0)),
	[FField06Minus] [money] NULL CONSTRAINT [SQLDBTable_FField06Minus_DF]  DEFAULT ((0)),
	[FField07Minus] [money] NULL CONSTRAINT [SQLDBTable_FField07Minus_DF]  DEFAULT ((0)),
	[FField08Minus] [money] NULL CONSTRAINT [SQLDBTable_FField08Minus_DF]  DEFAULT ((0)),
	[FField09Minus] [money] NULL CONSTRAINT [SQLDBTable_FField09Minus_DF]  DEFAULT ((0)),
	[FField10Minus] [money] NULL CONSTRAINT [SQLDBTable_FField10Minus_DF]  DEFAULT ((0)),
	[FField11Minus] [money] NULL CONSTRAINT [SQLDBTable_FField11Minus_DF]  DEFAULT ((0)),
	[FField12Minus] [money] NULL CONSTRAINT [SQLDBTable_FField12Minus_DF]  DEFAULT ((0)),
	[FField13Minus] [money] NULL CONSTRAINT [SQLDBTable_FField13Minus_DF]  DEFAULT ((0)),
	[FField14Minus] [money] NULL CONSTRAINT [SQLDBTable_FField14Minus_DF]  DEFAULT ((0)),
	[FField15Minus] [money] NULL CONSTRAINT [SQLDBTable_FField15Minus_DF]  DEFAULT ((0)),
	[FField01OR] [money] NULL CONSTRAINT [SQLDBTable_FField01OR_DF]  DEFAULT ((0)),
	[FField02OR] [money] NULL CONSTRAINT [SQLDBTable_FField02OR_DF]  DEFAULT ((0)),
	[FField03OR] [money] NULL CONSTRAINT [SQLDBTable_FField03OR_DF]  DEFAULT ((0)),
	[FField04OR] [money] NULL CONSTRAINT [SQLDBTable_FField04OR_DF]  DEFAULT ((0)),
	[FField05OR] [money] NULL CONSTRAINT [SQLDBTable_FField05OR_DF]  DEFAULT ((0)),
	[FField06OR] [money] NULL CONSTRAINT [SQLDBTable_FField06OR_DF]  DEFAULT ((0)),
	[FField07OR] [money] NULL CONSTRAINT [SQLDBTable_FField07OR_DF]  DEFAULT ((0)),
	[FField08OR] [money] NULL CONSTRAINT [SQLDBTable_FField08OR_DF]  DEFAULT ((0)),
	[FField09OR] [money] NULL CONSTRAINT [SQLDBTable_FField09OR_DF]  DEFAULT ((0)),
	[FField10OR] [money] NULL CONSTRAINT [SQLDBTable_FField10OR_DF]  DEFAULT ((0)),
	[FField11OR] [money] NULL CONSTRAINT [SQLDBTable_FField11OR_DF]  DEFAULT ((0)),
	[FField12OR] [money] NULL CONSTRAINT [SQLDBTable_FField12OR_DF]  DEFAULT ((0)),
	[Type] [varchar](3) NOT NULL CONSTRAINT [SQLDBTable_Type]  DEFAULT ('000'),
	[Nature] [varchar](1) NOT NULL CONSTRAINT [SQLDBTable_Nature]  DEFAULT ('C'),
 CONSTRAINT [SQLDBTable01] PRIMARY KEY CLUSTERED 
(
	[Type] ASC,
	[Ano] ASC,
	[Note] ASC,
	[Description] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
) ON [PRIMARY]

GO

model.ex

defmodule Example.Sync.SQLDBTable do
  use Example.Web, :model
  alias Example.Repo
  alias Example.SQLDBRepo

  @primary_key {:id, :string, autogenerate: false}
  schema "example_table" do
    field :name, :string
    field :year, :integer
    field :description,   :string
    field :note,  :string
    field :ffield00plus, :float
    field :ffield00minus, :float
    field :ffield01plus, :float
    field :ffield01minus,  :float
    field :total01,       :float
    field :ffield02plus, :float
    field :ffield02minus, :float
    field :total02, :float
    field :ffield03plus, :float
    field :ffield03minus, :float
    field :total03, :float
    field :ffield04plus, :float
    field :ffield04minus, :float
    field :total04, :float
    field :ffield05plus, :float
    field :ffield05minus, :float
    field :total05, :float
    field :ffield06plus, :float
    field :ffield06minus, :float
    field :total06, :float
    field :ffield07plus, :float
    field :ffield07minus, :float
    field :total07, :float
    field :ffield08plus, :float
    field :ffield08minus, :float
    field :total08, :float
    field :ffield09plus, :float
    field :ffield09minus, :float
    field :total09, :float
    field :ffield10plus, :float
    field :ffield10minus, :float
    field :total10, :float
    field :ffield11plus, :float
    field :ffield11minus, :float
    field :total11, :float
    field :ffield12plus, :float
    field :ffield12minus, :float
    field :total12, :float
    field :type, :string
  end

  @required_fields ~w()
  @optional_fields ~w()

end