How can I prevent SqlPackage.exe from dropping and re-creating constraints when deploying a dacpac?

Question

I have a Visual Studio sql project with a table defined like the following:

CREATE TABLE [dbo].[Hoerses]
(
   [HoersId] INT NOT NULL PRIMARY KEY,
   [DatePurchased] datetime NOT NULL CONSTRAINT [DF_Hoerses_DatePurchased] DEFAULT DATETIMEFROMPARTS(1985,01,01,0,0,0,0)
)

When I target a preexisting SQL database with a "Script" command

sqlpackage.exe /Action:Script /SourceFile:DatabaseProject1.dacpac  /Profile:publish.xml /OutputPath:deployscript_test.sql /TargetPassword:redacted

Then I get the following generated SQL even though the constraint had the same name and definition before & after:

PRINT N'Dropping [dbo].[DF_Hoerses_DatePurchased]...';


GO
ALTER TABLE [dbo].[Hoerses] DROP CONSTRAINT [DF_Hoerses_DatePurchased];


GO
PRINT N'Creating [dbo].[DF_Hoerses_DatePurchased]...';


GO
ALTER TABLE [dbo].[Hoerses]
    ADD CONSTRAINT [DF_Hoerses_DatePurchased] DEFAULT DATETIMEFROMPARTS(1985,01,01,0,0,0,0) FOR [DatePurchased];


GO
PRINT N'Update complete.';


GO

(My main concern with trying to prevent this superfluous re-creation is because I occasionally see a "Lock request time out period exceeded." error when it's trying to drop a constraint during actual deployments/publishing)

Answer 1

The problem was apparently in the use of DATETIMEFROMPARTS.

If I instead declare the table as

CREATE TABLE [dbo].[Hoerses]
(
   [HoersId] INT NOT NULL PRIMARY KEY,
   [DatePurchased] datetime NOT NULL CONSTRAINT [DF_Hoerses_DatePurchased] DEFAULT '1985-01-01'
) 

Then SqlPackage.exe no longer tries to drop & re-add the constraint.