DataSourceAdapter-Pattern + SiteExportService schlanker + Page-Services Scoped

- IDataSourceAdapter mit 3 Implementierungen (HANA, SAP_GATEWAY, MANUAL_EXCEL)
  und DataSourceAdapterResolver ersetzen das if/else auf ConnectionKind.
- SiteExportService von 338 auf 187 Zeilen reduziert: Pipeline
  Resolve -> Fetch -> Transform -> Excel -> Central -> SharePoint.
- Page-Services auf Scoped (per Blazor-Circuit); Orchestrator bleibt Singleton
  fuer geteilten Export-Status.

TrafagSalesExporter/Program.cs

@@ -2,6 +2,7 @@ using Microsoft.EntityFrameworkCore;
 using MudBlazor.Services;
 using TrafagSalesExporter.Data;
 using TrafagSalesExporter.Services;
+using TrafagSalesExporter.Services.DataSources;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -14,6 +15,7 @@ builder.Services.AddHttpClient(nameof(ExchangeRateImportService));
 builder.Services.AddDbContextFactory<AppDbContext>(options =>
     options.UseSqlite("Data Source=trafag_exporter.db;Default Timeout=60"));
 
+// Stateless Infrastruktur- und Connector-Services: Singleton.
 builder.Services.AddSingleton<IHanaQueryService, HanaQueryService>();
 builder.Services.AddSingleton<IExcelExportService, ExcelExportService>();
 builder.Services.AddSingleton<ISharePointUploadService, SharePointUploadService>();
@@ -36,7 +38,6 @@ builder.Services.AddSingleton<IRecordTransformationService, RecordTransformation
 builder.Services.AddSingleton<IAppEventLogService, AppEventLogService>();
 builder.Services.AddSingleton<IManagementCockpitService, ManagementCockpitService>();
 builder.Services.AddSingleton<IManualExcelImportService, ManualExcelImportService>();
-builder.Services.AddSingleton<ISiteExportService, SiteExportService>();
 builder.Services.AddSingleton<IConsolidatedExportService, ConsolidatedExportService>();
 builder.Services.AddSingleton<IExportLogService, ExportLogService>();
 builder.Services.AddSingleton<ICentralSalesRecordService, CentralSalesRecordService>();
@@ -44,18 +45,29 @@ builder.Services.AddSingleton<IConfigTransferService, ConfigTransferService>();
 builder.Services.AddSingleton<IDatabaseSchemaMaintenanceService, DatabaseSchemaMaintenanceService>();
 builder.Services.AddSingleton<IDatabaseSeedService, DatabaseSeedService>();
 builder.Services.AddSingleton<IDatabaseInitializationService, DatabaseInitializationService>();
-builder.Services.AddSingleton<ISettingsPageService, SettingsPageService>();
-builder.Services.AddSingleton<IStandortePageService, StandortePageService>();
-builder.Services.AddSingleton<IStandorteSapEditorService, StandorteSapEditorService>();
-builder.Services.AddSingleton<IManagementCockpitPageService, ManagementCockpitPageService>();
-builder.Services.AddSingleton<IDashboardPageService, DashboardPageService>();
-builder.Services.AddSingleton<ILogsPageService, LogsPageService>();
-builder.Services.AddSingleton<ITransformationsPageService, TransformationsPageService>();
 builder.Services.AddSingleton<IUiTextService, UiTextService>();
+
+// Datenquellen-Adapter (Strategy per ConnectionKind).
+builder.Services.AddSingleton<IDataSourceAdapter, HanaDataSourceAdapter>();
+builder.Services.AddSingleton<IDataSourceAdapter, SapGatewayDataSourceAdapter>();
+builder.Services.AddSingleton<IDataSourceAdapter, ManualExcelDataSourceAdapter>();
+builder.Services.AddSingleton<IDataSourceAdapterResolver, DataSourceAdapterResolver>();
+builder.Services.AddSingleton<ISiteExportService, SiteExportService>();
+
+// Orchestrator mit gemeinsamem Status ueber alle Circuits.
 builder.Services.AddSingleton<ExportOrchestrationService>();
 builder.Services.AddSingleton<TimerBackgroundService>();
 builder.Services.AddHostedService(sp => sp.GetRequiredService<TimerBackgroundService>());
 
+// UI-/Page-Services: Scoped = pro Blazor-Circuit.
+builder.Services.AddScoped<ISettingsPageService, SettingsPageService>();
+builder.Services.AddScoped<IStandortePageService, StandortePageService>();
+builder.Services.AddScoped<IStandorteSapEditorService, StandorteSapEditorService>();
+builder.Services.AddScoped<IManagementCockpitPageService, ManagementCockpitPageService>();
+builder.Services.AddScoped<IDashboardPageService, DashboardPageService>();
+builder.Services.AddScoped<ILogsPageService, LogsPageService>();
+builder.Services.AddScoped<ITransformationsPageService, TransformationsPageService>();
+
 var app = builder.Build();
 
 using (var scope = app.Services.CreateScope())

TrafagSalesExporter/Services/DataSources/DataSourceAdapterResolver.cs

@@ -0,0 +1,27 @@
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class DataSourceAdapterResolver : IDataSourceAdapterResolver
+{
+    private readonly Dictionary<string, IDataSourceAdapter> _adapters;
+
+    public DataSourceAdapterResolver(IEnumerable<IDataSourceAdapter> adapters)
+    {
+        _adapters = adapters.ToDictionary(
+            a => a.ConnectionKind,
+            StringComparer.OrdinalIgnoreCase);
+    }
+
+    public IDataSourceAdapter Resolve(string connectionKind)
+    {
+        if (string.IsNullOrWhiteSpace(connectionKind))
+            connectionKind = SourceSystemConnectionKinds.Hana;
+
+        if (_adapters.TryGetValue(connectionKind, out var adapter))
+            return adapter;
+
+        throw new InvalidOperationException(
+            $"Kein DataSourceAdapter fuer ConnectionKind '{connectionKind}' registriert.");
+    }
+}

TrafagSalesExporter/Services/DataSources/DataSourceCredentials.cs

@@ -0,0 +1,24 @@
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+internal static class DataSourceCredentials
+{
+    public static (string Username, string Password) Resolve(Site site, SourceSystemDefinition sourceDefinition)
+        => (FirstNonEmpty(site.UsernameOverride, sourceDefinition.CentralUsername),
+            FirstNonEmpty(site.PasswordOverride, sourceDefinition.CentralPassword));
+
+    public static string ResolveSapServiceUrl(Site site, SourceSystemDefinition sourceDefinition)
+        => FirstNonEmpty(site.SapServiceUrl, sourceDefinition.CentralServiceUrl);
+
+    public static string FirstNonEmpty(params string[] values)
+    {
+        foreach (var value in values)
+        {
+            if (!string.IsNullOrWhiteSpace(value))
+                return value.Trim();
+        }
+
+        return string.Empty;
+    }
+}

TrafagSalesExporter/Services/DataSources/DataSourceFetchContext.cs

@@ -0,0 +1,12 @@
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class DataSourceFetchContext
+{
+    public required Site Site { get; init; }
+    public required SourceSystemDefinition SourceDefinition { get; init; }
+    public required ExportSettings Settings { get; init; }
+    public SharePointConfig? SharePointConfig { get; init; }
+    public Action<string>? UpdateStatus { get; init; }
+}

TrafagSalesExporter/Services/DataSources/DataSourceFetchResult.cs

@@ -0,0 +1,14 @@
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class DataSourceFetchResult
+{
+    public required List<SalesRecord> Records { get; init; }
+
+    /// <summary>
+    /// Wenn gesetzt, liefert der Adapter bereits eine Referenz-Datei (z. B. manueller Excel-Import).
+    /// SiteExportService erzeugt dann keine neue Excel-Datei.
+    /// </summary>
+    public string? ReferenceFilePath { get; init; }
+}

TrafagSalesExporter/Services/DataSources/HanaDataSourceAdapter.cs

@@ -0,0 +1,71 @@
+using Microsoft.EntityFrameworkCore;
+using TrafagSalesExporter.Data;
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class HanaDataSourceAdapter : IDataSourceAdapter
+{
+    private readonly IDbContextFactory<AppDbContext> _dbFactory;
+    private readonly IHanaQueryService _hanaService;
+    private readonly IAppEventLogService _appEventLogService;
+
+    public HanaDataSourceAdapter(
+        IDbContextFactory<AppDbContext> dbFactory,
+        IHanaQueryService hanaService,
+        IAppEventLogService appEventLogService)
+    {
+        _dbFactory = dbFactory;
+        _hanaService = hanaService;
+        _appEventLogService = appEventLogService;
+    }
+
+    public string ConnectionKind => SourceSystemConnectionKinds.Hana;
+
+    public async Task<DataSourceFetchResult> FetchAsync(DataSourceFetchContext context)
+    {
+        var site = context.Site;
+        var sourceDefinition = context.SourceDefinition;
+
+        using var db = await _dbFactory.CreateDbContextAsync();
+        var exportServer = await BuildEffectiveServerAsync(db, site, sourceDefinition);
+
+        context.UpdateStatus?.Invoke("HANA Abfrage...");
+        await _appEventLogService.WriteAsync("Export", "HANA Abfrage gestartet",
+            siteId: site.Id, land: site.Land,
+            details: exportServer.GetConnectionStringPreview());
+
+        var records = await Task.Run(() => _hanaService.GetSalesRecords(
+            exportServer, site.Schema, site.TSC, site.Land, context.Settings.DateFilter));
+
+        return new DataSourceFetchResult { Records = records };
+    }
+
+    private static async Task<HanaServer> BuildEffectiveServerAsync(
+        AppDbContext db, Site site, SourceSystemDefinition sourceDefinition)
+    {
+        var centralServer = await db.HanaServers
+            .AsNoTracking()
+            .OrderBy(x => x.Id)
+            .FirstOrDefaultAsync(x => x.SourceSystem == sourceDefinition.Code)
+            ?? throw new InvalidOperationException(
+                $"Fuer Quellsystem '{sourceDefinition.Code}' ist keine zentrale HANA-Konfiguration vorhanden.");
+
+        var credentials = DataSourceCredentials.Resolve(site, sourceDefinition);
+
+        return new HanaServer
+        {
+            Id = centralServer.Id,
+            SourceSystem = centralServer.SourceSystem,
+            Name = centralServer.Name,
+            Host = centralServer.Host,
+            Port = centralServer.Port,
+            Username = credentials.Username,
+            Password = credentials.Password,
+            DatabaseName = centralServer.DatabaseName,
+            UseSsl = centralServer.UseSsl,
+            ValidateCertificate = centralServer.ValidateCertificate,
+            AdditionalParams = centralServer.AdditionalParams
+        };
+    }
+}

TrafagSalesExporter/Services/DataSources/IDataSourceAdapter.cs

@@ -0,0 +1,11 @@
+namespace TrafagSalesExporter.Services.DataSources;
+
+public interface IDataSourceAdapter
+{
+    /// <summary>
+    /// Der Wert aus <see cref="Models.SourceSystemConnectionKinds"/>, den dieser Adapter behandelt.
+    /// </summary>
+    string ConnectionKind { get; }
+
+    Task<DataSourceFetchResult> FetchAsync(DataSourceFetchContext context);
+}

TrafagSalesExporter/Services/DataSources/IDataSourceAdapterResolver.cs

@@ -0,0 +1,6 @@
+namespace TrafagSalesExporter.Services.DataSources;
+
+public interface IDataSourceAdapterResolver
+{
+    IDataSourceAdapter Resolve(string connectionKind);
+}

TrafagSalesExporter/Services/DataSources/ManualExcelDataSourceAdapter.cs

@@ -0,0 +1,93 @@
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class ManualExcelDataSourceAdapter : IDataSourceAdapter
+{
+    private readonly ISharePointUploadService _sharePointService;
+    private readonly IManualExcelImportService _manualExcelImportService;
+    private readonly IAppEventLogService _appEventLogService;
+
+    public ManualExcelDataSourceAdapter(
+        ISharePointUploadService sharePointService,
+        IManualExcelImportService manualExcelImportService,
+        IAppEventLogService appEventLogService)
+    {
+        _sharePointService = sharePointService;
+        _manualExcelImportService = manualExcelImportService;
+        _appEventLogService = appEventLogService;
+    }
+
+    public string ConnectionKind => SourceSystemConnectionKinds.ManualExcel;
+
+    public async Task<DataSourceFetchResult> FetchAsync(DataSourceFetchContext context)
+    {
+        var site = context.Site;
+
+        if (string.IsNullOrWhiteSpace(site.ManualImportFilePath))
+            throw new InvalidOperationException($"Standort '{site.Land}' hat keine manuelle Excel-Datei.");
+
+        var manualImportPath = site.ManualImportFilePath.Trim();
+        string filePath;
+        string? tempManualImportPath = null;
+        try
+        {
+            if (File.Exists(manualImportPath))
+            {
+                filePath = manualImportPath;
+            }
+            else if (LooksLikeSharePointReference(manualImportPath))
+            {
+                var spConfig = context.SharePointConfig
+                    ?? throw new InvalidOperationException(
+                        "Fuer SharePoint-Manuellimport fehlt eine vollstaendige SharePoint-Konfiguration in Settings.");
+
+                if (string.IsNullOrWhiteSpace(spConfig.TenantId) ||
+                    string.IsNullOrWhiteSpace(spConfig.ClientId) ||
+                    string.IsNullOrWhiteSpace(spConfig.ClientSecret) ||
+                    string.IsNullOrWhiteSpace(spConfig.SiteUrl))
+                {
+                    throw new InvalidOperationException(
+                        "Fuer SharePoint-Manuellimport fehlt eine vollstaendige SharePoint-Konfiguration in Settings.");
+                }
+
+                context.UpdateStatus?.Invoke("Manuelle Excel von SharePoint laden...");
+                await _appEventLogService.WriteAsync("Export", "Manuelle Excel von SharePoint laden",
+                    siteId: site.Id, land: site.Land, details: manualImportPath);
+
+                tempManualImportPath = await _sharePointService.DownloadToTempFileAsync(
+                    spConfig.TenantId, spConfig.ClientId, spConfig.ClientSecret,
+                    spConfig.SiteUrl, manualImportPath);
+                filePath = manualImportPath;
+            }
+            else
+            {
+                throw new InvalidOperationException(
+                    $"Die manuelle Excel-Datei wurde nicht gefunden: {manualImportPath}");
+            }
+
+            var readPath = tempManualImportPath ?? filePath;
+            context.UpdateStatus?.Invoke("Manuelle Excel lesen...");
+            await _appEventLogService.WriteAsync("Export", "Manuelle Excel lesen",
+                siteId: site.Id, land: site.Land, details: filePath);
+
+            var records = await _manualExcelImportService.ReadSalesRecordsAsync(readPath, site);
+            return new DataSourceFetchResult
+            {
+                Records = records,
+                ReferenceFilePath = filePath
+            };
+        }
+        finally
+        {
+            if (!string.IsNullOrWhiteSpace(tempManualImportPath) && File.Exists(tempManualImportPath))
+                File.Delete(tempManualImportPath);
+        }
+    }
+
+    private static bool LooksLikeSharePointReference(string path)
+        => path.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ||
+           path.StartsWith("https://", StringComparison.OrdinalIgnoreCase) ||
+           path.StartsWith("/Shared Documents/", StringComparison.OrdinalIgnoreCase) ||
+           path.StartsWith("Shared Documents/", StringComparison.OrdinalIgnoreCase);
+}

TrafagSalesExporter/Services/DataSources/SapGatewayDataSourceAdapter.cs

@@ -0,0 +1,81 @@
+using Microsoft.EntityFrameworkCore;
+using TrafagSalesExporter.Data;
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services.DataSources;
+
+public sealed class SapGatewayDataSourceAdapter : IDataSourceAdapter
+{
+    private readonly IDbContextFactory<AppDbContext> _dbFactory;
+    private readonly ISapCompositionService _sapCompositionService;
+    private readonly IAppEventLogService _appEventLogService;
+
+    public SapGatewayDataSourceAdapter(
+        IDbContextFactory<AppDbContext> dbFactory,
+        ISapCompositionService sapCompositionService,
+        IAppEventLogService appEventLogService)
+    {
+        _dbFactory = dbFactory;
+        _sapCompositionService = sapCompositionService;
+        _appEventLogService = appEventLogService;
+    }
+
+    public string ConnectionKind => SourceSystemConnectionKinds.SapGateway;
+
+    public async Task<DataSourceFetchResult> FetchAsync(DataSourceFetchContext context)
+    {
+        var site = context.Site;
+        var sourceDefinition = context.SourceDefinition;
+
+        var credentials = DataSourceCredentials.Resolve(site, sourceDefinition);
+        var sapServiceUrl = DataSourceCredentials.ResolveSapServiceUrl(site, sourceDefinition);
+        if (string.IsNullOrWhiteSpace(sapServiceUrl))
+            throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP Service URL.");
+
+        using var db = await _dbFactory.CreateDbContextAsync();
+        var sapSources = await db.SapSourceDefinitions.Where(s => s.SiteId == site.Id).ToListAsync();
+        var sapJoins = await db.SapJoinDefinitions.Where(j => j.SiteId == site.Id).ToListAsync();
+        var sapMappings = await db.SapFieldMappings.Where(m => m.SiteId == site.Id).ToListAsync();
+
+        if (sapSources.Count == 0)
+            throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP-Quellen konfiguriert.");
+        if (sapMappings.Count == 0)
+            throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP-Feldmappings.");
+
+        context.UpdateStatus?.Invoke("SAP Quellen laden...");
+        await _appEventLogService.WriteAsync("Export", "SAP Quellen laden",
+            siteId: site.Id, land: site.Land,
+            details: $"Sources={sapSources.Count} | Mappings={sapMappings.Count}");
+
+        var effectiveSite = CloneSiteWithSapServiceUrl(site, sapServiceUrl);
+        var records = await _sapCompositionService.BuildSalesRecordsAsync(
+            effectiveSite, sapSources, sapJoins, sapMappings,
+            credentials.Username, credentials.Password);
+
+        return new DataSourceFetchResult { Records = records };
+    }
+
+    private static Site CloneSiteWithSapServiceUrl(Site site, string sapServiceUrl)
+    {
+        return new Site
+        {
+            Id = site.Id,
+            HanaServerId = site.HanaServerId,
+            HanaServer = site.HanaServer,
+            Schema = site.Schema,
+            TSC = site.TSC,
+            Land = site.Land,
+            SourceSystem = site.SourceSystem,
+            UsernameOverride = site.UsernameOverride,
+            PasswordOverride = site.PasswordOverride,
+            LocalExportFolderOverride = site.LocalExportFolderOverride,
+            ManualImportFilePath = site.ManualImportFilePath,
+            ManualImportLastUploadedAtUtc = site.ManualImportLastUploadedAtUtc,
+            SapServiceUrl = sapServiceUrl,
+            SapEntitySet = site.SapEntitySet,
+            SapEntitySetsCache = site.SapEntitySetsCache,
+            SapEntitySetsRefreshedAtUtc = site.SapEntitySetsRefreshedAtUtc,
+            IsActive = site.IsActive
+        };
+    }
+}

TrafagSalesExporter/Services/SiteExportService.cs

@@ -2,45 +2,37 @@ using Microsoft.EntityFrameworkCore;
 using System.Diagnostics;
 using TrafagSalesExporter.Data;
 using TrafagSalesExporter.Models;
+using TrafagSalesExporter.Services.DataSources;
 
 namespace TrafagSalesExporter.Services;
 
 public class SiteExportService : ISiteExportService
 {
     private readonly IDbContextFactory<AppDbContext> _dbFactory;
-    private readonly IHanaQueryService _hanaService;
+    private readonly IDataSourceAdapterResolver _dataSourceResolver;
-    private readonly ISapGatewayService _sapGatewayService;
-    private readonly ISapCompositionService _sapCompositionService;
     private readonly IExcelExportService _excelService;
     private readonly ISharePointUploadService _sharePointService;
     private readonly IRecordTransformationService _transformationService;
     private readonly ICentralSalesRecordService _centralSalesRecordService;
-    private readonly IManualExcelImportService _manualExcelImportService;
     private readonly IAppEventLogService _appEventLogService;
     private readonly ILogger<SiteExportService> _logger;
 
     public SiteExportService(
         IDbContextFactory<AppDbContext> dbFactory,
-        IHanaQueryService hanaService,
+        IDataSourceAdapterResolver dataSourceResolver,
-        ISapGatewayService sapGatewayService,
-        ISapCompositionService sapCompositionService,
         IExcelExportService excelService,
         ISharePointUploadService sharePointService,
         IRecordTransformationService transformationService,
         ICentralSalesRecordService centralSalesRecordService,
-        IManualExcelImportService manualExcelImportService,
         IAppEventLogService appEventLogService,
         ILogger<SiteExportService> logger)
     {
         _dbFactory = dbFactory;
-        _hanaService = hanaService;
+        _dataSourceResolver = dataSourceResolver;
-        _sapGatewayService = sapGatewayService;
-        _sapCompositionService = sapCompositionService;
         _excelService = excelService;
         _sharePointService = sharePointService;
         _transformationService = transformationService;
         _centralSalesRecordService = centralSalesRecordService;
-        _manualExcelImportService = manualExcelImportService;
         _appEventLogService = appEventLogService;
         _logger = logger;
     }
@@ -58,167 +50,63 @@ public class SiteExportService : ISiteExportService
 
         try
         {
-            await _appEventLogService.WriteAsync("Export", "Export gestartet", siteId: site.Id, land: site.Land,
-                details: $"Quelle={NormalizeSourceSystem(site.SourceSystem)} | TSC={site.TSC}");
-            using var db = await _dbFactory.CreateDbContextAsync();
-            var settings = await db.ExportSettings.FirstOrDefaultAsync() ?? new ExportSettings();
-            var spConfig = await db.SharePointConfigs.FirstOrDefaultAsync();
-            var outputDir = ResolveSiteOutputDirectory(settings, site);
             var sourceSystem = NormalizeSourceSystem(site.SourceSystem);
-            var sourceDefinition = await db.SourceSystemDefinitions
+            await _appEventLogService.WriteAsync("Export", "Export gestartet",
-                .AsNoTracking()
+                siteId: site.Id, land: site.Land,
-                .OrderBy(x => x.Id)
+                details: $"Quelle={sourceSystem} | TSC={site.TSC}");
-                .FirstOrDefaultAsync(x => x.Code == sourceSystem)
-                ?? throw new InvalidOperationException($"Quellsystem '{sourceSystem}' ist nicht konfiguriert.");
-            var records = new List<SalesRecord>();
-            string filePath;
 
-            if (string.Equals(sourceDefinition.ConnectionKind, SourceSystemConnectionKinds.SapGateway, StringComparison.OrdinalIgnoreCase))
+            var (settings, spConfig, sourceDefinition, rules) = await LoadExportConfigAsync(site, sourceSystem);
+            var outputDir = ResolveSiteOutputDirectory(settings, site);
+
+            var adapter = _dataSourceResolver.Resolve(sourceDefinition.ConnectionKind);
+            var fetchResult = await adapter.FetchAsync(new DataSourceFetchContext
             {
-                var credentials = ResolveCredentials(site, sourceDefinition);
+                Site = site,
-                var sapServiceUrl = ResolveSapServiceUrl(site, sourceDefinition);
+                SourceDefinition = sourceDefinition,
-                if (string.IsNullOrWhiteSpace(sapServiceUrl))
+                Settings = settings,
-                    throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP Service URL.");
+                SharePointConfig = spConfig,
-                var sapSources = await db.SapSourceDefinitions.Where(s => s.SiteId == site.Id).ToListAsync();
+                UpdateStatus = updateStatus
-                var sapJoins = await db.SapJoinDefinitions.Where(j => j.SiteId == site.Id).ToListAsync();
+            });
-                var sapMappings = await db.SapFieldMappings.Where(m => m.SiteId == site.Id).ToListAsync();
-                if (sapSources.Count == 0)
-                    throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP-Quellen konfiguriert.");
-                if (sapMappings.Count == 0)
-                    throw new InvalidOperationException($"Standort '{site.Land}' hat keine SAP-Feldmappings.");
 
-                updateStatus?.Invoke("SAP Quellen laden...");
+            var records = fetchResult.Records;
-                await _appEventLogService.WriteAsync("Export", "SAP Quellen laden", siteId: site.Id, land: site.Land,
+
-                    details: $"Sources={sapSources.Count} | Mappings={sapMappings.Count}");
+            updateStatus?.Invoke("Transformationen anwenden...");
-                var effectiveSite = CloneSiteWithSapServiceUrl(site, sapServiceUrl);
+            await _appEventLogService.WriteAsync("Export", "Transformationen anwenden",
-                records = await _sapCompositionService.BuildSalesRecordsAsync(effectiveSite, sapSources, sapJoins, sapMappings, credentials.Username, credentials.Password);
+                siteId: site.Id, land: site.Land,
-                updateStatus?.Invoke("Transformationen anwenden...");
+                details: $"Records vor Transformation={records.Count}");
-                await _appEventLogService.WriteAsync("Export", "Transformationen anwenden", siteId: site.Id, land: site.Land,
+            _transformationService.Apply(records, rules);
-                    details: $"Records vor Transformation={records.Count}");
+
-                var rules = await db.FieldTransformationRules
+            var filePath = fetchResult.ReferenceFilePath;
-                    .Where(r => r.IsActive && r.SourceSystem == sourceSystem)
+            if (string.IsNullOrWhiteSpace(filePath))
-                    .OrderBy(r => r.SortOrder)
+            {
-                    .ToListAsync();
-                _transformationService.Apply(records, rules);
                 updateStatus?.Invoke("Excel erstellen...");
-                await _appEventLogService.WriteAsync("Export", "Excel erstellen", siteId: site.Id, land: site.Land,
+                await _appEventLogService.WriteAsync("Export", "Excel erstellen",
+                    siteId: site.Id, land: site.Land,
                     details: $"Records={records.Count}");
                 filePath = _excelService.CreateExcelFile(outputDir, site.TSC, DateTime.UtcNow.Date, records);
-                log.RowCount = records.Count;
             }
-            else if (string.Equals(sourceDefinition.ConnectionKind, SourceSystemConnectionKinds.ManualExcel, StringComparison.OrdinalIgnoreCase))
-            {
-                if (string.IsNullOrWhiteSpace(site.ManualImportFilePath))
-                    throw new InvalidOperationException($"Standort '{site.Land}' hat keine manuelle Excel-Datei.");
-                string? tempManualImportPath = null;
-                try
-                {
-                    var manualImportPath = site.ManualImportFilePath.Trim();
-                    if (File.Exists(manualImportPath))
-                    {
-                        filePath = manualImportPath;
-                    }
-                    else if (LooksLikeSharePointReference(manualImportPath))
-                    {
-                        if (spConfig is null ||
-                            string.IsNullOrWhiteSpace(spConfig.TenantId) ||
-                            string.IsNullOrWhiteSpace(spConfig.ClientId) ||
-                            string.IsNullOrWhiteSpace(spConfig.ClientSecret) ||
-                            string.IsNullOrWhiteSpace(spConfig.SiteUrl))
-                        {
-                            throw new InvalidOperationException("Fuer SharePoint-Manuellimport fehlt eine vollstaendige SharePoint-Konfiguration in Settings.");
-                        }
 
-                        updateStatus?.Invoke("Manuelle Excel von SharePoint laden...");
+            log.RowCount = records.Count;
-                        await _appEventLogService.WriteAsync("Export", "Manuelle Excel von SharePoint laden", siteId: site.Id, land: site.Land,
-                            details: manualImportPath);
-                        tempManualImportPath = await _sharePointService.DownloadToTempFileAsync(
-                            spConfig.TenantId, spConfig.ClientId, spConfig.ClientSecret, spConfig.SiteUrl, manualImportPath);
-                        filePath = manualImportPath;
-                    }
-                    else
-                    {
-                        throw new InvalidOperationException($"Die manuelle Excel-Datei wurde nicht gefunden: {manualImportPath}");
-                    }
-
-                    var readPath = tempManualImportPath ?? filePath;
-                    updateStatus?.Invoke("Manuelle Excel lesen...");
-                    await _appEventLogService.WriteAsync("Export", "Manuelle Excel lesen", siteId: site.Id, land: site.Land,
-                        details: filePath);
-                    records = await _manualExcelImportService.ReadSalesRecordsAsync(readPath, site);
-                }
-                finally
-                {
-                    if (!string.IsNullOrWhiteSpace(tempManualImportPath) && File.Exists(tempManualImportPath))
-                        File.Delete(tempManualImportPath);
-                }
-
-                updateStatus?.Invoke("Transformationen anwenden...");
-                await _appEventLogService.WriteAsync("Export", "Transformationen anwenden", siteId: site.Id, land: site.Land,
-                    details: $"Records vor Transformation={records.Count}");
-                var rules = await db.FieldTransformationRules
-                    .Where(r => r.IsActive && r.SourceSystem == sourceSystem)
-                    .OrderBy(r => r.SortOrder)
-                    .ToListAsync();
-                _transformationService.Apply(records, rules);
-
-                log.RowCount = records.Count;
-            }
-            else
-            {
-                var exportServer = await BuildEffectiveServerAsync(db, site, sourceDefinition);
-                updateStatus?.Invoke("HANA Abfrage...");
-                await _appEventLogService.WriteAsync("Export", "HANA Abfrage gestartet", siteId: site.Id, land: site.Land,
-                    details: exportServer.GetConnectionStringPreview());
-                records = await Task.Run(() => _hanaService.GetSalesRecords(
-                    exportServer, site.Schema, site.TSC, site.Land, settings.DateFilter));
-
-                updateStatus?.Invoke("Transformationen anwenden...");
-                await _appEventLogService.WriteAsync("Export", "Transformationen anwenden", siteId: site.Id, land: site.Land,
-                    details: $"Records vor Transformation={records.Count}");
-                var rules = await db.FieldTransformationRules
-                    .Where(r => r.IsActive && r.SourceSystem == sourceSystem)
-                    .OrderBy(r => r.SortOrder)
-                    .ToListAsync();
-                _transformationService.Apply(records, rules);
-
-                updateStatus?.Invoke("Excel erstellen...");
-                await _appEventLogService.WriteAsync("Export", "Excel erstellen", siteId: site.Id, land: site.Land,
-                    details: $"Records={records.Count}");
-                filePath = _excelService.CreateExcelFile(outputDir, site.TSC, DateTime.UtcNow.Date, records);
-                log.RowCount = records.Count;
-            }
 
             updateStatus?.Invoke("Zentrale Tabelle aktualisieren...");
-            await _appEventLogService.WriteAsync("Export", "Zentrale Tabelle aktualisieren", siteId: site.Id, land: site.Land,
+            await _appEventLogService.WriteAsync("Export", "Zentrale Tabelle aktualisieren",
+                siteId: site.Id, land: site.Land,
                 details: $"Records={records.Count}");
             await _centralSalesRecordService.ReplaceForSiteAsync(site, records, updateStatus);
 
-            var fileName = Path.GetFileName(filePath);
+            await UploadToSharePointIfConfiguredAsync(site, spConfig, filePath, updateStatus);
-
-            if (spConfig is not null &&
-                !string.IsNullOrWhiteSpace(spConfig.TenantId) &&
-                !string.IsNullOrWhiteSpace(spConfig.ClientId) &&
-                !string.IsNullOrWhiteSpace(spConfig.ClientSecret))
-            {
-                updateStatus?.Invoke("SharePoint Upload...");
-                await _appEventLogService.WriteAsync("Export", "SharePoint Upload gestartet", siteId: site.Id, land: site.Land,
-                    details: $"{spConfig.SiteUrl} | {spConfig.ExportFolder}");
-                await _sharePointService.UploadAsync(
-                    spConfig.TenantId, spConfig.ClientId, spConfig.ClientSecret,
-                    spConfig.SiteUrl, spConfig.ExportFolder, site.Land, filePath);
-            }
 
             sw.Stop();
             log.Status = "OK";
-            log.FileName = fileName;
+            log.FileName = Path.GetFileName(filePath);
             log.FilePath = filePath;
             log.DurationSeconds = sw.Elapsed.TotalSeconds;
 
             _logger.LogInformation("Export OK: {Land} ({TSC}) - {Rows} Zeilen in {Duration:F1}s",
                 site.Land, site.TSC, log.RowCount, sw.Elapsed.TotalSeconds);
-            await _appEventLogService.WriteAsync("Export", "Export erfolgreich", siteId: site.Id, land: site.Land,
+            await _appEventLogService.WriteAsync("Export", "Export erfolgreich",
-                details: $"Rows={log.RowCount} | Datei={fileName} | Pfad={filePath} | Dauer={sw.Elapsed.TotalSeconds:F1}s");
+                siteId: site.Id, land: site.Land,
+                details: $"Rows={log.RowCount} | Datei={log.FileName} | Pfad={filePath} | Dauer={sw.Elapsed.TotalSeconds:F1}s");
 
             return new SiteExportResult
             {
@@ -237,8 +125,8 @@ public class SiteExportService : ISiteExportService
             log.DurationSeconds = sw.Elapsed.TotalSeconds;
 
             _logger.LogError(ex, "Export Fehler: {Land} ({TSC})", site.Land, site.TSC);
-            await _appEventLogService.WriteAsync("Export", "Export fehlgeschlagen", "Error", siteId: site.Id, land: site.Land,
+            await _appEventLogService.WriteAsync("Export", "Export fehlgeschlagen", "Error",
-                details: ex.ToString());
+                siteId: site.Id, land: site.Land, details: ex.ToString());
 
             return new SiteExportResult
             {
@@ -249,90 +137,51 @@ public class SiteExportService : ISiteExportService
         }
     }
 
-    private static async Task<HanaServer> BuildEffectiveServerAsync(AppDbContext db, Site site, SourceSystemDefinition sourceDefinition)
+    private async Task<(ExportSettings settings, SharePointConfig? spConfig, SourceSystemDefinition sourceDefinition, List<FieldTransformationRule> rules)>
+        LoadExportConfigAsync(Site site, string sourceSystem)
     {
-        var centralServer = await db.HanaServers
+        using var db = await _dbFactory.CreateDbContextAsync();
+        var settings = await db.ExportSettings.FirstOrDefaultAsync() ?? new ExportSettings();
+        var spConfig = await db.SharePointConfigs.FirstOrDefaultAsync();
+        var sourceDefinition = await db.SourceSystemDefinitions
             .AsNoTracking()
             .OrderBy(x => x.Id)
-            .FirstOrDefaultAsync(x => x.SourceSystem == sourceDefinition.Code);
+            .FirstOrDefaultAsync(x => x.Code == sourceSystem)
-
+            ?? throw new InvalidOperationException($"Quellsystem '{sourceSystem}' ist nicht konfiguriert.");
-        if (centralServer is null)
+        var rules = await db.FieldTransformationRules
-            throw new InvalidOperationException($"Fuer Quellsystem '{sourceDefinition.Code}' ist keine zentrale HANA-Konfiguration vorhanden.");
+            .Where(r => r.IsActive && r.SourceSystem == sourceSystem)
-
+            .OrderBy(r => r.SortOrder)
-        var credentials = ResolveCredentials(site, sourceDefinition);
+            .ToListAsync();
-
+        return (settings, spConfig, sourceDefinition, rules);
-        return new HanaServer
-        {
-            Id = centralServer.Id,
-            SourceSystem = centralServer.SourceSystem,
-            Name = centralServer.Name,
-            Host = centralServer.Host,
-            Port = centralServer.Port,
-            Username = credentials.Username,
-            Password = credentials.Password,
-            DatabaseName = centralServer.DatabaseName,
-            UseSsl = centralServer.UseSsl,
-            ValidateCertificate = centralServer.ValidateCertificate,
-            AdditionalParams = centralServer.AdditionalParams
-        };
     }
 
-    private static (string Username, string Password) ResolveCredentials(Site site, SourceSystemDefinition sourceDefinition)
+    private async Task UploadToSharePointIfConfiguredAsync(
-        => (FirstNonEmpty(site.UsernameOverride, sourceDefinition.CentralUsername),
+        Site site, SharePointConfig? spConfig, string filePath, Action<string>? updateStatus)
-            FirstNonEmpty(site.PasswordOverride, sourceDefinition.CentralPassword));
+    {
+        if (spConfig is null ||
+            string.IsNullOrWhiteSpace(spConfig.TenantId) ||
+            string.IsNullOrWhiteSpace(spConfig.ClientId) ||
+            string.IsNullOrWhiteSpace(spConfig.ClientSecret))
+            return;
 
-    private static string ResolveSapServiceUrl(Site site, SourceSystemDefinition sourceDefinition)
+        updateStatus?.Invoke("SharePoint Upload...");
-        => FirstNonEmpty(site.SapServiceUrl, sourceDefinition.CentralServiceUrl);
+        await _appEventLogService.WriteAsync("Export", "SharePoint Upload gestartet",
+            siteId: site.Id, land: site.Land,
+            details: $"{spConfig.SiteUrl} | {spConfig.ExportFolder}");
+        await _sharePointService.UploadAsync(
+            spConfig.TenantId, spConfig.ClientId, spConfig.ClientSecret,
+            spConfig.SiteUrl, spConfig.ExportFolder, site.Land, filePath);
+    }
 
     private static string NormalizeSourceSystem(string? sourceSystem)
         => string.IsNullOrWhiteSpace(sourceSystem) ? "SAP" : sourceSystem.Trim().ToUpperInvariant();
 
-    private static string FirstNonEmpty(params string[] values)
-    {
-        foreach (var value in values)
-        {
-            if (!string.IsNullOrWhiteSpace(value))
-                return value.Trim();
-        }
-
-        return string.Empty;
-    }
-
     private static string ResolveSiteOutputDirectory(ExportSettings settings, Site site)
     {
-        var configured = FirstNonEmpty(site.LocalExportFolderOverride, settings.LocalSiteExportFolder);
+        var configured = DataSourceCredentials.FirstNonEmpty(
+            site.LocalExportFolderOverride, settings.LocalSiteExportFolder);
         return string.IsNullOrWhiteSpace(configured)
             ? Path.Combine(AppContext.BaseDirectory, "output")
             : configured;
     }
-
-    private static bool LooksLikeSharePointReference(string path)
-        => path.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ||
-           path.StartsWith("https://", StringComparison.OrdinalIgnoreCase) ||
-           path.StartsWith("/Shared Documents/", StringComparison.OrdinalIgnoreCase) ||
-           path.StartsWith("Shared Documents/", StringComparison.OrdinalIgnoreCase);
-
-    private static Site CloneSiteWithSapServiceUrl(Site site, string sapServiceUrl)
-    {
-        return new Site
-        {
-            Id = site.Id,
-            HanaServerId = site.HanaServerId,
-            HanaServer = site.HanaServer,
-            Schema = site.Schema,
-            TSC = site.TSC,
-            Land = site.Land,
-            SourceSystem = site.SourceSystem,
-            UsernameOverride = site.UsernameOverride,
-            PasswordOverride = site.PasswordOverride,
-            LocalExportFolderOverride = site.LocalExportFolderOverride,
-            ManualImportFilePath = site.ManualImportFilePath,
-            ManualImportLastUploadedAtUtc = site.ManualImportLastUploadedAtUtc,
-            SapServiceUrl = sapServiceUrl,
-            SapEntitySet = site.SapEntitySet,
-            SapEntitySetsCache = site.SapEntitySetsCache,
-            SapEntitySetsRefreshedAtUtc = site.SapEntitySetsRefreshedAtUtc,
-            IsActive = site.IsActive
-        };
-    }
 }