Add Fuchs_Database SSDT project (schema source of truth)

Adds the SQL Server Data Tools project for the fuchs_fds database — tables,
table types, functions and stored procedures that the backend calls (e.g.
fds__getInvoice, fds__merge_bankingtransactions, fds__tt__bankingtransactions,
fds__admin_getReportCatalog, fis_* auth). Build/model caches (bin, obj,
*.dbmdl, *.jfm, *.user) are git-ignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fuchs_Database/dbo/Stored Procedures/mfr__updt__attachments.sql

@@ -0,0 +1,39 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[mfr__updt__attachments]
+	@tblname as nvarchar(50)
+	, @referencetable nvarchar(50)
+	, @tgtid bigint
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+    DECLARE @tmp [dbo].[mfr__tt__attachments];
+
+	DECLARE @tmp_cmd nvarchar(1000) = N'SELECT DISTINCT * FROM ' + @tblname
+	INSERT INTO @tmp EXECUTE [sp_executesql] @tmp_cmd;
+
+
+	MERGE [dbo].[mfr__attachments] as TARGET
+		USING @tmp as SOURCE ON TARGET.[Id] = SOURCE.[Id]
+	WHEN MATCHED AND (TARGET.[Version] <= SOURCE.[Version])  THEN
+		UPDATE
+			SET [Id] = SOURCE.[Id]
+			  ,[Version] = SOURCE.[Version]
+			  ,[URI] = SOURCE.[URI]
+			  ,[StepId] = SOURCE.[StepId]
+	WHEN NOT MATCHED BY TARGET THEN
+		INSERT
+			   ([Id]
+				  ,[Version]
+				  ,[URI]
+				  ,[StepId])
+		 VALUES
+			    (SOURCE.[Id]
+				  ,SOURCE.[Version]
+				  ,SOURCE.[URI]
+				  ,SOURCE.[StepId]);
+END