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/fis_widgets_setCache.sql

@@ -0,0 +1,30 @@
+-- =============================================
+-- Author:		Dr. Stefan Ott
+-- Create date: <Create Date,,>
+-- Description:	<Description,,>
+-- =============================================
+CREATE PROCEDURE [dbo].[fis_widgets_setCache]
+	@account varchar(50)
+	,@short_name varchar(50)
+	,@login_guid varchar(36)
+	,@data nvarchar(max)
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+	DECLARE @IsCacheable bit, @Personalized bit;
+	SELECT @IsCacheable = [daycache], @personalized = [personalized] 
+		FROM [dbo].[fis_widgets] 
+		WHERE ([account] = @account OR [account] = '*') AND [short_name] = @short_name;
+
+	DELETE FROM [dbo].[fis_widgets_cache]
+		WHERE [date] <> CAST(GETUTCDATE() as date)
+			OR ([account] = @account AND [short_name] = @short_name AND @Personalized = 0)
+			OR ([account] = @account AND [short_name] = @short_name AND @Personalized = 1 AND [person_guid] = @login_guid);
+
+	IF @IsCacheable = 1
+		BEGIN
+			INSERT INTO [dbo].[fis_widgets_cache]
+				VALUES( @account, @short_name, @login_guid, CAST(GETUTCDATE() as date), @data );
+		END
+END