chore(examples): add SQL Server DDL import test case and README

examples/sqlserver/README.md

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+# SQL Server Import Example
+
+This folder contains a sample SQL Server DDL that currently causes import errors in DrawDB.
+It can be used to reproduce and test issue #529.
+
+**File:** `employees-ddl.sql`
+
+Features included:
+- `IDENTITY` columns
+- `GO` batch separators
+- `getdate()` in CHECK constraints

examples/sqlserver/employees-ddl.sql

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+CREATE TABLE "Employees" (
+"EmployeeID" "int" IDENTITY (1, 1) NOT NULL ,
+"LastName" nvarchar (20) NOT NULL ,
+"FirstName" nvarchar (10) NOT NULL ,
+"Title" nvarchar (30) NULL ,
+"TitleOfCourtesy" nvarchar (25) NULL ,
+"BirthDate" "datetime" NULL ,
+"HireDate" "datetime" NULL ,
+"Address" nvarchar (60) NULL ,
+"City" nvarchar (15) NULL ,
+"Region" nvarchar (15) NULL ,
+"PostalCode" nvarchar (10) NULL ,
+"Country" nvarchar (15) NULL ,
+"HomePhone" nvarchar (24) NULL ,
+"Extension" nvarchar (4) NULL ,
+"Photo" "image" NULL ,
+"Notes" "ntext" NULL ,
+"ReportsTo" "int" NULL ,
+"PhotoPath" nvarchar (255) NULL ,
+CONSTRAINT "PK_Employees" PRIMARY KEY CLUSTERED
+(
+"EmployeeID"
+),
+CONSTRAINT "FK_Employees_Employees" FOREIGN KEY
+(
+"ReportsTo"
+) REFERENCES "dbo"."Employees" (
+"EmployeeID"
+),
+CONSTRAINT "CK_Birthdate" CHECK (BirthDate < getdate())
+)
+GO
+CREATE INDEX "LastName" ON "dbo"."Employees"("LastName")
+GO
+CREATE INDEX "PostalCode" ON "dbo"."Employees"("PostalCode")
+GO