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___PartnerSet.sql

@@ -0,0 +1,43 @@
+-- =============================================
+-- Author:		<Author,,Name>
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[mfr__updt__*PartnerSet]
+	@tblname as nvarchar(50)
+	, @referencetable nvarchar(50)
+	, @tgtid bigint
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+    DECLARE @tmp [dbo].[mfr__tt__*PartnerSet];
+
+	DECLARE @tmp_cmd nvarchar(1000) = N'SELECT DISTINCT * FROM [' + @tblname + ']';
+	INSERT INTO @tmp EXECUTE [sp_executesql] @tmp_cmd;
+
+
+	MERGE [dbo].[mfr__*PartnerSet] as TARGET
+		USING @tmp as SOURCE ON 
+				 TARGET.[Property] = SOURCE.[Property]
+				AND TARGET.[PartnerType] = SOURCE.[PartnerType]
+				AND TARGET.[PartnerId] = SOURCE.[PartnerId]
+				AND TARGET.[EntityId] = SOURCE.[EntityId]
+	WHEN MATCHED THEN
+		UPDATE
+			SET [Property] = SOURCE.[Property]
+				,[PartnerType] = SOURCE.[PartnerType]
+				,[PartnerId] = SOURCE.[PartnerId]
+				,[EntityId] = SOURCE.[EntityId]
+	WHEN NOT MATCHED BY TARGET THEN
+		INSERT
+			   ( [Property]
+				,[PartnerType]
+				,[PartnerId]
+				,[EntityId])
+		 VALUES
+			    (SOURCE.[Property]
+				,SOURCE.[PartnerType]
+				,SOURCE.[PartnerId]
+				,SOURCE.[EntityId]);
+END