diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 3098f14..bfc1512 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -15,6 +15,7 @@
 - Build app: `dotnet build Fuchs/Fuchs.csproj -c Debug`. Build all: `dotnet build Fuchs_Intranet.slnx -c Debug`.
 - Frontend assets are source-built: run the gulp tasks in `Fuchs/` (`npx gulp min`, or `npx gulp all` when copied/static assets also need refreshing) whenever JS or SCSS/CSS sources change. The generated files under `Fuchs/wwwroot/web/` are what the app serves.
 - Test: `dotnet test Fuchs.Tests/Fuchs.Tests.csproj -c Debug`.
+- Submodules include the OCORE projects and `eRechnungLib` (ZUGFeRD/Factur-X + XRechnung generation) — invoices are moving to eRechnung output.
 - Project structure (relative to `Fuchs/`):
   - `Controllers/` — `IntranetController` partials (no area)
   - `code/` — business logic, PDF, email, widgets, data models
diff --git a/.gitmodules b/.gitmodules
index b5daf74..61f0707 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "OCORE_Charting"]
 	path = OCORE_Charting
 	url = https://git.processweb.de/Stefan/OCORE_Charting.git
+[submodule "eRechnungLib"]
+	path = eRechnungLib
+	url = https://git.processweb.de/ProcessWeb_Tools/eRechnungLib.git
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..5e4f082
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,8 @@
+{
+    "chat.tools.terminal.autoApprove": {
+        "dotnet run": true,
+        "dotnet test": true,
+        "dotnet build": true,
+        "npx gulp": true
+    }
+}
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
index a7bbac7..c6b1216 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -11,7 +11,7 @@
 ## Project Overview
 - **Fuchs Intranet** — ASP.NET Core (**.NET 10**) web app; the intranet IS the whole website, served from `/`.
 - Routes: `/{fn?}/{id?}/{code?}` → `IntranetController.Index`; `/do/{fn?}/{id?}/{code?}` → `IntranetController.Do` (dispatches by `fn` to `Do_Process_*`).
-- Solution `Fuchs_Intranet.slnx`. Key projects: `Fuchs` (web), `Fuchs_DataService` (MFR sync worker), `MFR_RESTClient`, `CAMTParser`, `Fuchs.Tests`, and the OCORE submodules (`OCORE`, `OCORE_web`, `OCORE_web_pdf`, `OCORE_Charting`). `MT940Parser` is an external referenced project.
+- Solution `Fuchs_Intranet.slnx`. Key projects: `Fuchs` (web), `Fuchs_DataService` (MFR sync worker), `MFR_RESTClient`, `CAMTParser`, `Fuchs.Tests`, and the OCORE submodules (`OCORE`, `OCORE_web`, `OCORE_web_pdf`, `OCORE_Charting`). `eRechnungLib` is a submodule (ZUGFeRD/Factur-X + XRechnung generation) — invoices are moving to eRechnung output. `MT940Parser` is an external referenced project.
 
 ## Build & Test (workflow)
 - Build app: `dotnet build Fuchs/Fuchs.csproj -c Debug`. Build all: `dotnet build Fuchs_Intranet.slnx -c Debug`.
diff --git a/CODEX.md b/CODEX.md
index e83a569..9058e9c 100644
--- a/CODEX.md
+++ b/CODEX.md
@@ -11,7 +11,7 @@
 ## Project Overview
 - **Fuchs Intranet** — ASP.NET Core (**.NET 10**) web app; the intranet IS the whole website, served from `/`.
 - Routes: `/{fn?}/{id?}/{code?}` -> `IntranetController.Index`; `/do/{fn?}/{id?}/{code?}` -> `IntranetController.Do` (dispatches by `fn` to `Do_Process_*`).
-- Solution `Fuchs_Intranet.slnx`. Key projects: `Fuchs` (web), `Fuchs_DataService` (MFR sync worker), `MFR_RESTClient`, `CAMTParser`, `Fuchs.Tests`, and the OCORE submodules (`OCORE`, `OCORE_web`, `OCORE_web_pdf`, `OCORE_Charting`). `MT940Parser` is an external referenced project.
+- Solution `Fuchs_Intranet.slnx`. Key projects: `Fuchs` (web), `Fuchs_DataService` (MFR sync worker), `MFR_RESTClient`, `CAMTParser`, `Fuchs.Tests`, and the OCORE submodules (`OCORE`, `OCORE_web`, `OCORE_web_pdf`, `OCORE_Charting`). `eRechnungLib` is a submodule (ZUGFeRD/Factur-X + XRechnung generation) — invoices are moving to eRechnung output. `MT940Parser` is an external referenced project.
 
 ## Build & Test (workflow)
 - Build app: `dotnet build Fuchs/Fuchs.csproj -c Debug`. Build all: `dotnet build Fuchs_Intranet.slnx -c Debug`.
diff --git a/Fuchs.Tests/Fuchs.Tests.csproj b/Fuchs.Tests/Fuchs.Tests.csproj
index 3cfb7ed..1e28bd3 100644
--- a/Fuchs.Tests/Fuchs.Tests.csproj
+++ b/Fuchs.Tests/Fuchs.Tests.csproj
@@ -28,6 +28,7 @@
     <ProjectReference Include="..\MFR_RESTClient\MFR_RESTClient.csproj" />
     <ProjectReference Include="..\..\..\WebProjectComponents\MT940Parser\MT940Parser\MT940Parser.csproj" />
     <ProjectReference Include="..\CAMTParser\CAMTParser.csproj" />
+    <ProjectReference Include="..\eRechnungLib\src\eRechnungLib\eRechnungLib.csproj" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Fuchs.Tests/PdfPipelineTests.cs b/Fuchs.Tests/PdfPipelineTests.cs
new file mode 100644
index 0000000..88f7772
--- /dev/null
+++ b/Fuchs.Tests/PdfPipelineTests.cs
@@ -0,0 +1,370 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using eRechnungLib;
+using eRechnungLib.Model;
+using eRechnungLib.Model.CodeLists;
+using eRechnungLib.Profiles;
+using Fuchs.intranet;
+using Fuchs.Services;
+using MigraDoc.DocumentObjectModel;
+using MigraDoc.Rendering;
+using Microsoft.Extensions.Configuration;
+using PdfSharp.Pdf.IO;
+using Xunit;
+
+namespace Fuchs.Tests;
+
+/// <summary>
+/// Exercises the invoice PDF pipeline end to end:
+///   1. a visual invoice PDF is produced with PdfSharp/MigraDoc,
+///   2. it is rasterised to preview images via Spire (the licensed path used by <c>sprep</c>),
+///   3. it is turned into a formally valid eRechnung (ZUGFeRD/Factur-X hybrid + XRechnung XML)
+///      via eRechnungLib — the direction the project is moving in (all invoices as eRechnung).
+/// Both an intentionally succeeding and an intentionally failing conversion path are covered.
+/// </summary>
+public class PdfPipelineTests
+{
+    // ── Stage 1 helper: a "dummy" visual invoice PDF built purely with PdfSharp/MigraDoc ──
+    private static byte[] BuildDummyPdfWithPdfSharp()
+    {
+        // Same font resolver the production render path installs (PdfSharp 6 no longer
+        // resolves system fonts on its own).
+        if (PdfSharp.Fonts.GlobalFontSettings.FontResolver is null ||
+            PdfSharp.Fonts.GlobalFontSettings.FontResolver.GetType() != typeof(OCORE_web_pdf.pdf.OCOREFontResolver))
+        {
+            PdfSharp.Fonts.GlobalFontSettings.FontResolver = new OCORE_web_pdf.pdf.OCOREFontResolver();
+        }
+
+        var doc = new Document();
+        doc.Info.Title = "Dummy Rechnung";
+        var normal = doc.Styles["Normal"]!;
+        normal.Font.Name = "Arial";
+        var sec = doc.AddSection();
+        var title = sec.AddParagraph("Rechnung Nr. RE-2026-0001");
+        title.Format.Font.Size = 14;
+        title.Format.Font.Bold = true;
+        sec.AddParagraph("Position 1: Beratungsleistung — 200,00 EUR netto");
+        sec.AddParagraph("Position 2: Entwicklung — 500,00 EUR netto");
+
+        var renderer = new PdfDocumentRenderer { Document = doc };
+        renderer.RenderDocument();
+        using var ms = new MemoryStream();
+        renderer.PdfDocument.Save(ms, closeStream: false);
+        return ms.ToArray();
+    }
+
+    // ── Stage 3 helper: a minimal but EN 16931-complete domestic invoice model ──
+    private static Invoice BuildValidInvoice(string number = "RE-2026-0001")
+    {
+        var seller = new TradeParty
+        {
+            Name = "Sebastian Fuchs Bad und Heizung GmbH & Co. KG",
+            Address = new PostalAddress
+            {
+                Line1 = "Germaniastraße 15",
+                City = "Düsseldorf",
+                PostalCode = "40223",
+                Country = CountryCode.Germany,
+            },
+            Contact = new TradeContact { Name = "Sebastian Fuchs", Email = "info@sanitaerfuchs.de", Telephone = "0211 3107222" },
+            ElectronicAddress = new Identifier("DE286366012", "0204"),
+        };
+        seller.TaxRegistrations.Add(new TaxRegistration("DE286366012", TaxRegistrationScheme.Vat));
+
+        var buyer = new TradeParty
+        {
+            Name = "Beispiel Kunde AG",
+            Address = new PostalAddress
+            {
+                Line1 = "Kundenweg 2",
+                City = "München",
+                PostalCode = "80331",
+                Country = CountryCode.Germany,
+            },
+        };
+
+        var invoice = new Invoice
+        {
+            InvoiceNumber = number,
+            IssueDate = new DateOnly(2026, 6, 1),
+            CurrencyCode = CurrencyCode.Eur,
+            BuyerReference = "04011000-12345-34",
+            Seller = seller,
+            Buyer = buyer,
+            Payment = new PaymentInstructions
+            {
+                MeansCode = PaymentMeansCode.SepaCreditTransfer,
+                RemittanceInformation = number,
+            },
+            PaymentTerms = new PaymentTerms
+            {
+                Description = "Zahlbar innerhalb von 14 Tagen netto.",
+                DueDate = new DateOnly(2026, 6, 15),
+            },
+        };
+        invoice.Payment.CreditTransfers.Add(new CreditTransferAccount
+        {
+            AccountId = "DE52301502000002091478",
+            AccountName = seller.Name,
+            BankId = "WELADED1KSD",
+        });
+        invoice.Lines.Add(new InvoiceLine
+        {
+            Id = "1",
+            Quantity = 1m,
+            UnitCode = UnitCode.One,
+            NetPrice = 200m,
+            VatCategory = VatCategoryCode.StandardRate,
+            VatRate = 19m,
+            Item = new TradeItem { Name = "Beratungsleistung", Description = "Beratung nach Aufwand" },
+        });
+        invoice.Lines.Add(new InvoiceLine
+        {
+            Id = "2",
+            Quantity = 1m,
+            UnitCode = UnitCode.One,
+            NetPrice = 500m,
+            VatCategory = VatCategoryCode.StandardRate,
+            VatRate = 19m,
+            Item = new TradeItem { Name = "Entwicklung", SellerItemId = "DEV-01" },
+        });
+
+        InvoiceCalculator.Recalculate(invoice);
+        return invoice;
+    }
+
+    // ── Stage 1 ───────────────────────────────────────────────────────────────
+    [Fact]
+    public void Stage1_PdfSharp_produces_a_valid_pdf()
+    {
+        byte[] pdf = BuildDummyPdfWithPdfSharp();
+
+        Assert.True(pdf.Length > 1000);
+        Assert.StartsWith("%PDF", Encoding.ASCII.GetString(pdf, 0, 4));
+    }
+
+    // ── Stage 2 (Spire rasterisation — the sprep preview path) ─────────────────
+    [Fact]
+    public async Task Stage2_Spire_rasterises_the_pdf_to_preview_images()
+    {
+        FuchsPdf.SetLicense();
+        byte[] pdf = BuildDummyPdfWithPdfSharp();
+
+        var images = await FuchsPdf.BytesToImageCollection(pdf);
+
+        Assert.True(images.TotalPages >= 1);
+        Assert.NotEmpty(images.ImgB64Array);
+        Assert.All(images.ImgB64Array, b64 => Assert.False(string.IsNullOrWhiteSpace(b64)));
+    }
+
+    // ── Stage 3 (eRechnung XML) ────────────────────────────────────────────────
+    [Theory]
+    [InlineData(XRechnungSyntax.Ubl)]
+    [InlineData(XRechnungSyntax.Cii)]
+    public void Stage3_eRechnung_XRechnung_is_valid(XRechnungSyntax syntax)
+    {
+        var result = EInvoice.CreateInvoice(BuildValidInvoice())
+            .ToXRechnung(syntax, XRechnungVersion.V4_0);
+
+        Assert.True(result.Success);
+        Assert.True(result.Validation.IsValid, result.Validation.ToString());
+        Assert.Contains("RE-2026-0001", Encoding.UTF8.GetString(result.Value!));
+    }
+
+    // ── Stage 3 (ZUGFeRD hybrid embedded into the PdfSharp visual PDF) ─────────
+    [Fact]
+    public void Stage3_eRechnung_Zugferd_embeds_xml_into_supplied_visual_pdf()
+    {
+        byte[] visualPdf = BuildDummyPdfWithPdfSharp();
+
+        var result = EInvoice.CreateInvoice(BuildValidInvoice())
+            .ToZugferd(ZugferdProfile.EN16931, visualPdf);
+
+        Assert.True(result.Success);
+        Assert.StartsWith("%PDF", Encoding.ASCII.GetString(result.Value!, 0, 4));
+
+        using var ms = new MemoryStream(result.Value!);
+        var pdfDoc = PdfReader.Open(ms, PdfDocumentOpenMode.Import);
+        // Factur-X associated-file array must be present on the catalog.
+        Assert.NotNull(pdfDoc.Internals.Catalog.Elements.GetArray("/AF"));
+    }
+
+    // ── Full chain: PdfSharp → Spire images → eRechnung hybrid ─────────────────
+    [Fact]
+    public async Task FullChain_pdfsharp_spire_eRechnung()
+    {
+        FuchsPdf.SetLicense();
+
+        // 1. Visual PDF via PdfSharp.
+        byte[] visualPdf = BuildDummyPdfWithPdfSharp();
+        Assert.StartsWith("%PDF", Encoding.ASCII.GetString(visualPdf, 0, 4));
+
+        // 2. Preview images via Spire.
+        var images = await FuchsPdf.BytesToImageCollection(visualPdf);
+        Assert.True(images.TotalPages >= 1);
+        Assert.NotEmpty(images.ImgB64Array);
+
+        // 3. eRechnung (ZUGFeRD/Factur-X) embedding the CII XML into the visual PDF.
+        var hybrid = EInvoice.CreateInvoice(BuildValidInvoice()).ToZugferd(ZugferdProfile.EN16931, visualPdf);
+        Assert.True(hybrid.Success);
+        Assert.True(hybrid.Validation.IsValid, hybrid.Validation.ToString());
+
+        using var ms = new MemoryStream(hybrid.Value!);
+        var pdfDoc = PdfReader.Open(ms, PdfDocumentOpenMode.Import);
+        var names = pdfDoc.Internals.Catalog.Elements.GetDictionary("/Names");
+        var embeddedFiles = names!.Elements.GetDictionary("/EmbeddedFiles");
+        var nameArray = embeddedFiles!.Elements.GetArray("/Names");
+        Assert.Contains(nameArray!.Elements, e => e.ToString()!.Contains("factur-x.xml"));
+    }
+
+    // ── Intentionally failing conversion path ──────────────────────────────────
+    [Fact]
+    public void eRechnung_strict_validation_withholds_output_on_invalid_invoice()
+    {
+        var invoice = BuildValidInvoice("RE-2026-0009");
+        invoice.BuyerReference = null; // violates BR-DE-15 for XRechnung
+
+        var result = EInvoice.CreateInvoice(invoice)
+            .ToXRechnung(XRechnungSyntax.Ubl, XRechnungVersion.V4_0,
+                new ConversionOptions { StrictValidation = true });
+
+        Assert.False(result.Success);
+        Assert.Null(result.Value);
+        Assert.Contains(result.Validation.Errors, m => m.RuleId == "BR-DE-15");
+    }
+
+    // ── Spire license selection (managed secret vs embedded fallback) ──────────
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    [InlineData("   ")]
+    public void ResolveLicenseKey_falls_back_to_embedded_when_secret_absent(string? provided)
+    {
+        string key = FuchsPdf.ResolveLicenseKey(provided);
+
+        Assert.False(string.IsNullOrWhiteSpace(key));
+        Assert.True(key.Length > 100); // the embedded key, not the (empty) input
+    }
+
+    [Fact]
+    public void ResolveLicenseKey_uses_managed_secret_when_present()
+    {
+        const string secret = "MANAGED-SECRET-LICENSE-VALUE";
+
+        Assert.Equal(secret, FuchsPdf.ResolveLicenseKey(secret));
+    }
+
+    [Fact]
+    public void LicenseConfigKey_matches_the_managed_secret_name_in_appsettings()
+    {
+        // The Key Vault secret is "fuchs--SpirePdf-License"; the secret-management layer strips
+        // the app prefix, splits "--" into ":" and maps "-" to "_" per segment. So the managed
+        // key "SpirePdf-License" must surface under the config key the service reads.
+        const string managedSecretName = "SpirePdf-License";
+        string expectedConfigKey = string.Join(':',
+            managedSecretName.Split("--").Select(seg => seg.Replace("-", "_")));
+
+        Assert.Equal(FuchsPdfService.LicenseConfigKey, expectedConfigKey);
+
+        // And that managed secret is actually registered in the real appsettings.json.
+        var config = new ConfigurationBuilder()
+            .SetBasePath(AppContext.BaseDirectory)
+            .AddJsonFile("appsettings.json", optional: false)
+            .Build();
+        var managedKeys = config.GetSection("SecretManagement:ManagedSecretKeys").Get<string[]>() ?? [];
+        Assert.Contains(managedSecretName, managedKeys);
+    }
+
+    [Theory]
+    [InlineData("SpirePdf_License")]   // managed-secret mapping (fuchs--SpirePdf-License → '-' to '_')
+    [InlineData("SpirePdf-License")]   // verbatim, e.g. appsettings.Development.json
+    [InlineData("SpirePdf:License")]   // ':'-hierarchy variant
+    [InlineData("fuchs:SpirePdf-License")]
+    public void ResolveLicenseFromConfiguration_FindsLicenseUnderEachKnownKeyVariant(string key)
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?> { [key] = "the-license-value" })
+            .Build();
+
+        string? value = FuchsPdfService.ResolveLicenseFromConfiguration(config, out string? matchedKey);
+
+        Assert.Equal("the-license-value", value);
+        Assert.Equal(key, matchedKey);
+    }
+
+    [Fact]
+    public void ResolveLicenseFromConfiguration_ReturnsNull_WhenNoCandidateHasAValue()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["SpirePdf_License"] = "   ",              // whitespace-only is treated as absent
+                ["Unrelated:Key"]    = "x"
+            })
+            .Build();
+
+        string? value = FuchsPdfService.ResolveLicenseFromConfiguration(config, out string? matchedKey);
+
+        Assert.Null(value);
+        Assert.Null(matchedKey);
+    }
+
+    [Fact]
+    public void ResolveLicenseFromConfiguration_ReturnsNull_WhenValueIsUnloadedManagedSecretPlaceholder()
+    {
+        // appsettings.json ships "SpirePdf_License": "MANAGED_BY_KEYVAULT" so the key always
+        // exists; until Key Vault/cache overrides it, the literal must be treated as "no license"
+        // so the embedded fallback is used rather than applying the placeholder as a bogus key.
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                [FuchsPdfService.LicenseConfigKey] = FuchsPdfService.UnloadedSecretPlaceholder
+            })
+            .Build();
+
+        string? value = FuchsPdfService.ResolveLicenseFromConfiguration(config, out string? matchedKey);
+
+        Assert.Null(value);
+        Assert.Null(matchedKey);
+    }
+
+    [Fact]
+    public void ResolveLicenseFromConfiguration_SkipsPlaceholder_AndReturnsRealValueFromAnotherCandidate()
+    {
+        // The canonical key still carries the unresolved placeholder while a real license was
+        // supplied verbatim (e.g. appsettings.Development.json) under a different candidate key.
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                [FuchsPdfService.LicenseConfigKey] = FuchsPdfService.UnloadedSecretPlaceholder,
+                ["SpirePdf-License"]               = "the-real-license"
+            })
+            .Build();
+
+        string? value = FuchsPdfService.ResolveLicenseFromConfiguration(config, out string? matchedKey);
+
+        Assert.Equal("the-real-license", value);
+        Assert.Equal("SpirePdf-License", matchedKey);
+    }
+
+    [Fact]
+    public void SpireLikeConfigKeys_ReportsSpireRelatedKeysForDiagnostics()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["fuchs:SpirePdf-License"] = "value",
+                ["Other:Setting"]          = "value"
+            })
+            .Build();
+
+        var keys = FuchsPdfService.SpireLikeConfigKeys(config).ToArray();
+
+        Assert.Contains("fuchs:SpirePdf-License", keys);
+        Assert.DoesNotContain("Other:Setting", keys);
+    }
+}
diff --git a/Fuchs.Tests/StartupSelfTestServiceTests.cs b/Fuchs.Tests/StartupSelfTestServiceTests.cs
new file mode 100644
index 0000000..ff0199a
--- /dev/null
+++ b/Fuchs.Tests/StartupSelfTestServiceTests.cs
@@ -0,0 +1,308 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Fuchs.intranet;
+using Fuchs.Services;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using Xunit;
+
+namespace Fuchs.Tests;
+
+public class StartupSelfTestServiceTests
+{
+    private static StartupSelfTestSettings CreateSettings(
+        bool enabled,
+        bool checkKeyVault = true,
+        bool checkDatabase = true,
+        bool checkMfr = true,
+        bool sendStartupEmail = false,
+        string startupRecipient = "",
+        bool checkPdfLicense = false) => new()
+        {
+            Enabled = enabled,
+            CheckKeyVault = checkKeyVault,
+            CheckDatabase = checkDatabase,
+            CheckMfr = checkMfr,
+            CheckPdfLicense = checkPdfLicense,
+            SendStartupEmail = sendStartupEmail,
+            StartupEmailRecipient = startupRecipient,
+            StartupEmailRecipientName = "Monitor"
+        };
+
+    private static IConfiguration CreateConfiguration() =>
+        new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
+        {
+            ["SecretManagement:AppName"] = "fuchs",
+            ["SecretManagement:ManagedSecretKeys:0"] = "Fuchs--Mailer--Token"
+        }).Build();
+
+    [Fact]
+    public async Task ExecuteAsync_Disabled_DoesNotRunAnyChecks()
+    {
+        using var service = new TestableStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            CreateConfiguration(),
+            Options.Create(CreateSettings(enabled: false)),
+            NullLogger<StartupSelfTestService>.Instance)
+        {
+            KeyVaultResult = true,
+            DatabaseResult = true,
+            MfrResult = true,
+            MailerResult = true
+        };
+
+        await service.RunForTestAsync(CancellationToken.None);
+
+        Assert.Equal(0, service.KeyVaultCalls);
+        Assert.Equal(0, service.DatabaseCalls);
+        Assert.Equal(0, service.MfrCalls);
+        Assert.Equal(0, service.MailerCalls);
+    }
+
+    [Fact]
+    public async Task ExecuteAsync_EnabledWithAllChecks_CallsAllProbes()
+    {
+        using var service = new TestableStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            CreateConfiguration(),
+            Options.Create(CreateSettings(enabled: true, checkKeyVault: true, checkDatabase: true, checkMfr: true, sendStartupEmail: true, startupRecipient: "ops@example.test", checkPdfLicense: true)),
+            NullLogger<StartupSelfTestService>.Instance)
+        {
+            KeyVaultResult = true,
+            DatabaseResult = true,
+            MfrResult = true,
+            MailerResult = true,
+            PdfLicenseResult = true
+        };
+
+        await service.RunForTestAsync(CancellationToken.None);
+
+        Assert.Equal(1, service.KeyVaultCalls);
+        Assert.Equal(1, service.DatabaseCalls);
+        Assert.Equal(1, service.MfrCalls);
+        Assert.Equal(1, service.MailerCalls);
+        Assert.Equal(1, service.PdfLicenseCalls);
+    }
+
+    [Fact]
+    public async Task ExecuteAsync_PdfLicenseCheckDisabled_DoesNotProbePdfLicense()
+    {
+        using var service = new TestableStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            CreateConfiguration(),
+            Options.Create(CreateSettings(enabled: true, checkKeyVault: false, checkDatabase: false, checkMfr: false, checkPdfLicense: false)),
+            NullLogger<StartupSelfTestService>.Instance)
+        {
+            PdfLicenseResult = true
+        };
+
+        await service.RunForTestAsync(CancellationToken.None);
+
+        Assert.Equal(0, service.PdfLicenseCalls);
+    }
+
+    [Fact]
+    public async Task ProbePdfLicenseAsync_MissingLicenseString_ReturnsFalse()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>())
+            .Build();
+        using var service = new ProbeExposingStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            config,
+            Options.Create(CreateSettings(enabled: true, checkPdfLicense: true)),
+            NullLogger<StartupSelfTestService>.Instance);
+
+        bool ok = await service.InvokeProbePdfLicenseAsync(CancellationToken.None);
+
+        Assert.False(ok);
+    }
+
+    [Fact]
+    public async Task ProbePdfLicenseAsync_EmptyLicenseString_ReturnsFalse()
+    {
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                [FuchsPdfService.LicenseConfigKey] = "   "
+            })
+            .Build();
+        using var service = new ProbeExposingStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            config,
+            Options.Create(CreateSettings(enabled: true, checkPdfLicense: true)),
+            NullLogger<StartupSelfTestService>.Instance);
+
+        bool ok = await service.InvokeProbePdfLicenseAsync(CancellationToken.None);
+
+        Assert.False(ok);
+    }
+
+    [Fact]
+    public async Task ProbePdfLicenseAsync_InvalidLicenseString_ReportsUnlicensed()
+    {
+        // A syntactically-present but invalid key leaves Spire.PDF in evaluation mode, which the
+        // probe must detect (the evaluation watermark appears on the rendered document).
+        var config = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                [FuchsPdfService.LicenseConfigKey] = "not-a-valid-spire-license-key"
+            })
+            .Build();
+        using var service = new ProbeExposingStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            config,
+            Options.Create(CreateSettings(enabled: true, checkPdfLicense: true)),
+            NullLogger<StartupSelfTestService>.Instance);
+
+        try
+        {
+            bool ok = await service.InvokeProbePdfLicenseAsync(CancellationToken.None);
+            Assert.False(ok);
+        }
+        finally
+        {
+            // Restore the embedded (valid-format) key so other Spire-using tests aren't left
+            // with a malformed license that makes Spire throw on save.
+            FuchsPdf.SetLicense();
+        }
+    }
+
+    [Fact]
+    public void SpirePdfIsLicensed_InEvaluationMode_ReturnsFalse()
+    {
+        // The embedded fallback key does not license current Spire.PDF, so Spire runs as the
+        // evaluation edition and stamps a watermark, which the detection reports as unlicensed.
+        FuchsPdf.SetLicense();
+
+        Assert.False(StartupSelfTestService.SpirePdfIsLicensed());
+    }
+
+    [Fact]
+    public async Task ExecuteAsync_EnabledWithMailerOnly_CallsOnlyMailerCheck()
+    {
+        using var service = new TestableStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            CreateConfiguration(),
+            Options.Create(CreateSettings(enabled: true, checkKeyVault: false, checkDatabase: false, checkMfr: false, sendStartupEmail: true, startupRecipient: "ops@example.test")),
+            NullLogger<StartupSelfTestService>.Instance)
+        {
+            KeyVaultResult = true,
+            DatabaseResult = true,
+            MfrResult = true,
+            MailerResult = false
+        };
+
+        await service.RunForTestAsync(CancellationToken.None);
+
+        Assert.Equal(0, service.KeyVaultCalls);
+        Assert.Equal(0, service.DatabaseCalls);
+        Assert.Equal(0, service.MfrCalls);
+        Assert.Equal(1, service.MailerCalls);
+    }
+
+    [Fact]
+    public async Task ExecuteAsync_ProbeThrows_ServiceDoesNotThrowAndContinuesRemainingChecks()
+    {
+        using var service = new TestableStartupSelfTestService(
+            new ServiceCollection().BuildServiceProvider(),
+            CreateConfiguration(),
+            Options.Create(CreateSettings(enabled: true, checkKeyVault: true, checkDatabase: true, checkMfr: true, sendStartupEmail: true, startupRecipient: "ops@example.test")),
+            NullLogger<StartupSelfTestService>.Instance)
+        {
+            KeyVaultException = new InvalidOperationException("probe failed"),
+            DatabaseResult = true,
+            MfrResult = true,
+            MailerResult = true
+        };
+
+        var exception = await Record.ExceptionAsync(async () =>
+        {
+            await service.RunForTestAsync(CancellationToken.None);
+        });
+
+        Assert.Null(exception);
+        Assert.Equal(1, service.KeyVaultCalls);
+        Assert.Equal(1, service.DatabaseCalls);
+        Assert.Equal(1, service.MfrCalls);
+        Assert.Equal(1, service.MailerCalls);
+    }
+
+    private sealed class TestableStartupSelfTestService : StartupSelfTestService
+    {
+        public int KeyVaultCalls { get; private set; }
+        public int DatabaseCalls { get; private set; }
+        public int MfrCalls { get; private set; }
+        public int MailerCalls { get; private set; }
+        public int PdfLicenseCalls { get; private set; }
+        public bool KeyVaultResult { get; set; }
+        public bool DatabaseResult { get; set; }
+        public bool MfrResult { get; set; }
+        public bool MailerResult { get; set; }
+        public bool PdfLicenseResult { get; set; }
+        public Exception? KeyVaultException { get; set; }
+
+        public TestableStartupSelfTestService(
+            IServiceProvider serviceProvider,
+            IConfiguration configuration,
+            IOptions<StartupSelfTestSettings> settings,
+            Microsoft.Extensions.Logging.ILogger<StartupSelfTestService> logger)
+            : base(serviceProvider, configuration, settings, logger)
+        {
+        }
+
+        protected override Task<bool> ProbeKeyVaultAsync(CancellationToken cancellationToken)
+        {
+            KeyVaultCalls++;
+            if (KeyVaultException is not null) throw KeyVaultException;
+            return Task.FromResult(KeyVaultResult);
+        }
+
+        protected override Task<bool> SendStartupEmailAsync(CancellationToken cancellationToken)
+        {
+            MailerCalls++;
+            return Task.FromResult(MailerResult);
+        }
+
+        protected override Task<bool> ProbeDatabaseAsync(CancellationToken cancellationToken)
+        {
+            DatabaseCalls++;
+            return Task.FromResult(DatabaseResult);
+        }
+
+        protected override Task<bool> ProbeMfrAsync(CancellationToken cancellationToken)
+        {
+            MfrCalls++;
+            return Task.FromResult(MfrResult);
+        }
+
+        protected override Task<bool> ProbePdfLicenseAsync(CancellationToken cancellationToken)
+        {
+            PdfLicenseCalls++;
+            return Task.FromResult(PdfLicenseResult);
+        }
+
+        public Task RunForTestAsync(CancellationToken cancellationToken)
+            => RunOnceAsync(cancellationToken);
+    }
+
+    /// <summary>Exposes the real (non-overridden) PDF license probe for direct testing.</summary>
+    private sealed class ProbeExposingStartupSelfTestService : StartupSelfTestService
+    {
+        public ProbeExposingStartupSelfTestService(
+            IServiceProvider serviceProvider,
+            IConfiguration configuration,
+            IOptions<StartupSelfTestSettings> settings,
+            Microsoft.Extensions.Logging.ILogger<StartupSelfTestService> logger)
+            : base(serviceProvider, configuration, settings, logger)
+        {
+        }
+
+        public Task<bool> InvokeProbePdfLicenseAsync(CancellationToken cancellationToken)
+            => ProbePdfLicenseAsync(cancellationToken);
+    }
+}
diff --git a/Fuchs/Controllers/IntranetController.Banking.cs b/Fuchs/Controllers/IntranetController.Banking.cs
index 6c69d04..efbb431 100644
--- a/Fuchs/Controllers/IntranetController.Banking.cs
+++ b/Fuchs/Controllers/IntranetController.Banking.cs
@@ -235,7 +235,7 @@ public partial class IntranetController
             }
 
             default:
-                return Ok();
+                return await JSONAsync(new { ok = true });
         }
     }
 
diff --git a/Fuchs/Controllers/IntranetController.Invoices.cs b/Fuchs/Controllers/IntranetController.Invoices.cs
index a4ccf3e..cbc0dbb 100644
--- a/Fuchs/Controllers/IntranetController.Invoices.cs
+++ b/Fuchs/Controllers/IntranetController.Invoices.cs
@@ -36,7 +36,7 @@ public partial class IntranetController
                         StdParamlist(SQL_VarChar("@Id", invoiceId)),
                         Security: DbSec, options: SqlOpt(fn, id, code));
                     if (!ok) _logger.LogError("setpyd: SQL failed for invoice {InvoiceId}, user={User}", invoiceId, UserAccountID);
-                    return ok ? Ok() : StatusCode(500);
+                    return ok ? await JSONAsync(new { ok = true }) : StatusCode(500);
                 }
 
             case "setupd":
@@ -50,7 +50,7 @@ public partial class IntranetController
                         StdParamlist(SQL_VarChar("@Id", invoiceId)),
                         Security: DbSec, options: SqlOpt(fn, id, code));
                     if (!ok) _logger.LogError("setupd: SQL failed for invoice {InvoiceId}, user={User}", invoiceId, UserAccountID);
-                    return ok ? Ok() : StatusCode(500);
+                    return ok ? await JSONAsync(new { ok = true }) : StatusCode(500);
                 }
 
             case "setvat":
@@ -72,7 +72,7 @@ public partial class IntranetController
                         _intranet.Intranet_SqlCon(), ref sqlEx, ref sqlCode, pl, Security: DbSec);
                     if (!string.IsNullOrEmpty(sqlEx))
                         _logger.LogError("setvat: SQL error for report {ReportId}: {SqlError}, user={User}", Form("id"), sqlEx, UserAccountID);
-                    return string.IsNullOrEmpty(sqlEx) ? Ok() : StatusCode(500, new { error = sqlEx });
+                    return string.IsNullOrEmpty(sqlEx) ? await JSONAsync(new { ok = true }) : StatusCode(500, new { error = sqlEx });
                 }
 
             case "sis":
@@ -94,7 +94,7 @@ public partial class IntranetController
                     }
                     else
                         await _events.InvoiceMarkedSentAsync(invoiceId, invoiceId, UserAccountID);
-                    return string.IsNullOrEmpty(dt2.Exception) ? Ok() : StatusCode(500);
+                    return string.IsNullOrEmpty(dt2.Exception) ? await JSONAsync(new { ok = true }) : StatusCode(500);
                 }
 
             case "pget":
@@ -156,11 +156,11 @@ public partial class IntranetController
                 using (var mfr = _mfrFactory.Create())
                     await mfr.Update__entitytable(EntityTypes.Invoice,
                         fds.FdsMfr.UpdateNeed.Reset, new[] { relId });
-                return Ok();
+                return await JSONAsync(new { ok = true });
 
             default:
                 _logger.LogWarning("Do_Process_Invoices: unhandled action id={Id}, user={User}", id, UserAccountID);
-                return Ok();
+                return await JSONAsync(new { ok = true });
         }
     }
 }
diff --git a/Fuchs/Controllers/IntranetController.Invoices2.cs b/Fuchs/Controllers/IntranetController.Invoices2.cs
index fbc1019..319dcfc 100644
--- a/Fuchs/Controllers/IntranetController.Invoices2.cs
+++ b/Fuchs/Controllers/IntranetController.Invoices2.cs
@@ -58,7 +58,7 @@ public partial class IntranetController
             _logger.LogInformation("HandleInvoicePget reset complete for tgtid={TgtId} invoices={InvCount} serviceRequests={SrqCount} user={User}",
                 tgtid, invIds.Count, srqIds.Count, UserAccountID);
         }
-        return Ok();
+        return await JSONAsync(new { ok = true });
     }
 
     private async Task<IActionResult> HandleInvoiceGet(string fn, string id, string code)
diff --git a/Fuchs/Controllers/IntranetController.Reminder.cs b/Fuchs/Controllers/IntranetController.Reminder.cs
index 45b42d8..3c57213 100644
--- a/Fuchs/Controllers/IntranetController.Reminder.cs
+++ b/Fuchs/Controllers/IntranetController.Reminder.cs
@@ -66,7 +66,7 @@ public partial class IntranetController
                     await _events.ReminderIssueAsync(
                         $"Mahnung {Form("id")} konnte nicht als versandt markiert werden.",
                         UserAccountID, Form("id"));
-                return string.IsNullOrEmpty(dt2.Exception) ? Ok() : StatusCode(500);
+                return string.IsNullOrEmpty(dt2.Exception) ? await JSONAsync(new { ok = true }) : StatusCode(500);
             }
 
             case "rdoc":
@@ -98,7 +98,7 @@ public partial class IntranetController
                 });
             }
 
-            default: return Ok();
+            default: return await JSONAsync(new { ok = true });
         }
     }
 
@@ -160,7 +160,7 @@ public partial class IntranetController
                     $"Die Mahn-PDF {frdic.nz("DocumentName", "").ne($"Zahlungserinnerung_{remId}.pdf")} konnte nicht erstellt werden.",
                     UserAccountID, remId);
             }
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         return await ReminderIssueResult("Die Mahnung konnte aufgrund eines Fehlers nicht erstellt werden.");
     }
@@ -223,7 +223,7 @@ public partial class IntranetController
                         UserAccountID, remId);
                 }
             }
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         return await ReminderIssueResult("Die Mahnung konnte aufgrund eines Fehlers nicht versandt werden.");
     }
diff --git a/Fuchs/Controllers/IntranetController.Requests.cs b/Fuchs/Controllers/IntranetController.Requests.cs
index 26d818d..2ec8e1f 100644
--- a/Fuchs/Controllers/IntranetController.Requests.cs
+++ b/Fuchs/Controllers/IntranetController.Requests.cs
@@ -92,13 +92,13 @@ public partial class IntranetController
                     _intranet.Intranet__SQLConnectionString,
                     StdParamlist(SQL_VarChar("@Id", Form("id"))),
                     Security: DbSec, options: SqlOpt(fn, id, code));
-                return Ok();
+                return await JSONAsync(new { ok = true });
 
             case "sconf":  return await HandleRequestSconf(fn, id, code);
             case "idoc":   return await HandleRequestIdoc(fn, id, code);
             case "resend": return await HandleRequestResend(fn, id, code);
 
-            default: return Ok();
+            default: return await JSONAsync(new { ok = true });
         }
     }
 
@@ -165,7 +165,13 @@ public partial class IntranetController
 
     private async Task<IActionResult> HandleRequestPget(string fn, string id, string code)
     {
-        if (!HasForm("id") || !long.TryParse(Form("id"), out long tgtid)) return BadRequest400();
+        if (!HasForm("id") || !long.TryParse(Form("id"), out long tgtid))
+        {
+            _logger.LogWarning("HandleRequestPget: missing/invalid 'id' value='{Value}' user={User}", Form("id"), UserAccountID);
+            return BadRequest400();
+        }
+        _logger.LogDebug("HandleRequestPget tgtid={TgtId} user={User}", tgtid, UserAccountID);
+
         var dt = await getSQLDatatable_async(
             "SELECT * FROM [dbo].[fds__getRequestTreeIds](@srqid);",
             _intranet.Intranet__SQLConnectionString,
@@ -181,15 +187,19 @@ public partial class IntranetController
                 if (iid > 0 && !ids.Contains(iid)) ids.Add(iid);
             }
         }
+        _logger.LogDebug("HandleRequestPget tgtid={TgtId} resolved {Count} related ids: {Ids}", tgtid, ids.Count, string.Join(",", ids));
+
         var schemaDic = new Dictionary<string, fds.FdsMfrClient.DatabaseSchema>
         {
             [EntityHelper.EntityName(EntityTypes.ServiceRequest)] =
                 new fds.FdsMfrClient.DatabaseSchema(EntityTypes.ServiceRequest)
         };
         using var mfr = _mfrFactory.Create();
-        await mfr.Update__entitytable(EntityTypes.ServiceRequest,
+        bool ok = await mfr.Update__entitytable(EntityTypes.ServiceRequest,
             fds.FdsMfr.UpdateNeed.Reset, ids.ToArray(), schemaDic: schemaDic);
-        return Ok();
+        _logger.LogInformation("HandleRequestPget MFR update complete tgtid={TgtId} ids={Count} success={Success} user={User}",
+            tgtid, ids.Count, ok, UserAccountID);
+        return await JSONAsync(new { ok });
     }
 
     private async Task<IActionResult> HandleRequestGet(string fn, string id, string code)
@@ -321,7 +331,7 @@ public partial class IntranetController
                     $"Die Rechnungs-PDF {frdic.nz("DocumentName").ne($"Rechnung_{invId}.pdf")} konnte nicht erstellt werden.",
                     UserAccountID, invId);
             }
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         return await InvoiceIssueResult("Die Rechnung konnte aufgrund eines Fehlers nicht erstellt werden.");
     }
@@ -381,7 +391,7 @@ public partial class IntranetController
                         UserAccountID, invId);
                 }
             }
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         return await InvoiceIssueResult("Die Rechnung konnte aufgrund eines Fehlers nicht versandt werden.");
     }
diff --git a/Fuchs/Controllers/IntranetController.cs b/Fuchs/Controllers/IntranetController.cs
index c516489..2342e6a 100644
--- a/Fuchs/Controllers/IntranetController.cs
+++ b/Fuchs/Controllers/IntranetController.cs
@@ -144,7 +144,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
         {
             IActionResult? result = fn.ToLower() switch
             {
-                "ping"    => Ok(),
+                "ping"    => await JSONAsync(new { ok = true }),
                 "wdg"     => await _widgets.GetWidgetAsync(id, UserAccountID, DbSec, Request),
                 "todos"   => new PhysicalFileResult(
                                  Path.Combine(Directory.GetCurrentDirectory(), "Data", "ProjectToDos.html"),
@@ -168,7 +168,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
                 _logger.LogWarning("No handler matched fn={Fn}", fn);
             else
                 _logger.LogDebug("Do completed fn={Fn}/{Id} result={ResultType}", fn, id, result.GetType().Name);
-            return result ?? Ok();
+            return result ?? await JSONAsync(new { ok = true });
         }
         catch (Exception ex)
         {
@@ -255,7 +255,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
             UserAccountID, HttpContext.Connection.RemoteIpAddress);
         await HttpContext.SignOutAsync(Fuchs_intranet.AuthScheme);
         _logger.LogDebug("Logout sign-out complete for user={User}", UserAccountID);
-        return Ok();
+        return await JSONAsync(new { ok = true });
     }
 
     // ── Password helpers ──────────────────────────────────────────────────────
@@ -285,7 +285,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
         {
             _logger.LogDebug("HandleSendPasswordCode: no SMS sent for email={Email} (user not found, name mismatch, no mobile, or localhost)", email);
         }
-        return Ok(); // always OK to prevent enumeration
+        return await JSONAsync(new { ok = true }); // always OK to prevent enumeration
     }
 
     private async Task<IActionResult> HandleSendPassword(string fn, string id, string code)
@@ -323,7 +323,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
         {
             _logger.LogWarning("HandleSendPassword: TOTP verification failed for email={Email}", email);
         }
-        return Ok();
+        return await JSONAsync(new { ok = true });
     }
 
     private async Task<IActionResult> HandleAccount(string fn, string id, string code)
@@ -345,7 +345,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
                 {
                     _logger.LogDebug("HandleAccount sms: no SMS sent for user={User} (no mobile or localhost)", UserAccountID);
                 }
-                return Ok();
+                return await JSONAsync(new { ok = true });
 
             case "changepassword":
                 string? npw  = Request.Form["npw"];
@@ -400,10 +400,10 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
                     },
                     Security: DbSec, options: SqlOpt(fn, id, code));
                 _logger.LogDebug("Password changed successfully for user={User}", UserAccountID);
-                return Ok();
+                return await JSONAsync(new { ok = true });
         }
         _logger.LogWarning("HandleAccount unknown action={Action} user={User}", id, UserAccountID);
-        return Ok();
+        return await JSONAsync(new { ok = true });
     }
 
     private async Task<IActionResult> HandleMfr(string fn, string id, string code)
@@ -429,7 +429,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
         }
         _logger.LogWarning("HandleMfr access denied for user={User} authorization={Auth}",
             UserAccountID, UserIdent.Authorization);
-        return Ok();
+        return await JSONAsync(new { ok = true });
     }
 
     private async Task<IActionResult> HandleMfrUpdate(string fn, string id, string code)
@@ -444,7 +444,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
             using var mfrSingle = _mfrFactory.Create();
             await mfrSingle.Update__entitytable(et, fds.FdsMfr.UpdateNeed.Short);
             _logger.LogDebug("MfrUpdate Short completed for entity={EntityType}", et);
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         if (et != EntityTypes.none && !string.IsNullOrEmpty(Request.Form["need"]))
         {
@@ -453,7 +453,7 @@ public partial class IntranetController : Microsoft.AspNetCore.Mvc.Controller
             using var mfr = _mfrFactory.Create();
             await mfr.Update__entitytable(et, updateNeed: need, debugDetails: false);
             _logger.LogDebug("MfrUpdate completed for entity={EntityType} need={Need}", et, need);
-            return Ok();
+            return await JSONAsync(new { ok = true });
         }
         _logger.LogWarning("HandleMfrUpdate bad request: unknown type={Type} user={User}", typeParam, UserAccountID);
         return BadRequest400();
diff --git a/Fuchs/Docs/Decisions/0005-pdf-generation-and-erechnung.md b/Fuchs/Docs/Decisions/0005-pdf-generation-and-erechnung.md
new file mode 100644
index 0000000..c3d2497
--- /dev/null
+++ b/Fuchs/Docs/Decisions/0005-pdf-generation-and-erechnung.md
@@ -0,0 +1,84 @@
+---
+status: Accepted
+date: 2026-07-05
+applyTo:
+  - "Fuchs/code/FuchsPdf.cs"
+  - "Fuchs/Services/FuchsPdfService.cs"
+  - "Fuchs/Services/InvoiceService.cs"
+  - "Fuchs/Services/ReminderService.cs"
+  - "eRechnungLib/**"
+supersededBy: ""
+---
+
+# 0005 — PDF generation, rendering, and eRechnung output
+
+## Context
+Fuchs produces letters, invoices, and reminders as PDFs. The layout is a faithful
+port of the legacy VB module `fuchs_fds_pdf.vb` (letterhead, DIN address window,
+admin block, four-block footer with page numbers, invoice item table, GiroCode).
+The port had silently drifted — wrong letterhead image filenames (`image1.png`
+instead of the shipped `image1.jpeg`, which `AddHeaderImage` skips via
+`File.Exists`), a too-small bottom margin, and a reworked footer/admin block — so
+generated PDFs (e.g. the `sprep` invoice preview) rendered broken.
+
+Separately, German B2B/B2G invoicing now requires **eRechnung** (structured
+electronic invoices). The company direction is that **all invoices are emitted as
+eRechnung**, not just human-readable PDFs.
+
+Rendering also depends on **Spire.PDF** (commercial, licensed) for PDF/A
+conversion and rasterising PDFs to preview images.
+
+## Decision
+- **PDF layout stays a 1:1 port of the legacy `fuchs_fds_pdf.vb`.** `FuchsPdf`
+  (MigraDoc/PdfSharp) is the single source of the visual layout. When changing
+  the letter/invoice/reminder layout, compare against the legacy module and keep
+  the letterhead assets (`Fuchs/Data/image1-3.jpeg`, `image4.png`, `overlay.png`),
+  margins, sender line, label-over-value admin block, absolutely-positioned
+  four-block footer, and `Seite X von Y` page numbers aligned with it. Reference
+  the shipped asset filenames exactly — `AddHeaderImage` no-ops on a missing file,
+  so a wrong extension silently drops a logo.
+- **Rendering pipeline:** `FuchsPdf.DocToPdfBytes` renders MigraDoc → PDF and
+  post-processes to PDF/A; `DocToImageCollection` / `BytesToImageCollection`
+  rasterise via Spire for the on-screen invoice preview (`sprep`/`sedit`). The
+  OCORE `OCOREFontResolver` must be installed before any PdfSharp rendering.
+- **Spire license comes from a managed secret.** `FuchsPdfService` reads the
+  license from configuration key `SpirePdf_License` (Key Vault secret
+  `fuchs--SpirePdf-License`, registered in `ManagedSecretKeys`) and passes it to
+  `FuchsPdf.SetLicense(key)`. An embedded fallback key keeps local/dev rendering
+  working without Key Vault.
+- **eRechnung via `eRechnungLib`.** The `eRechnungLib` submodule is the single
+  library for structured invoices. Invoices are to be produced as eRechnung:
+  build an `eRechnungLib.Model.Invoice` from the Fuchs invoice data, then
+  `EInvoice.CreateInvoice(model).ToZugferd(ZugferdProfile.EN16931, visualPdfBytes)`
+  to embed the CII XML into the FuchsPdf-rendered visual PDF (ZUGFeRD/Factur-X
+  hybrid PDF/A-3), or `ToXRechnung(...)` for pure UBL/CII XML. The visual PDF is
+  the FuchsPdf output — the two layers stay consistent (same amounts/parties).
+  Default `ConversionOptions` runs model + XSD validation; use `StrictValidation`
+  when a malformed invoice must withhold output rather than ship with findings.
+
+## Consequences
+- Layout edits must be validated against the legacy reference and the shipped
+  `Data/` assets; do not invent new positions/sizes. The pipeline test
+  `Fuchs.Tests/PdfPipelineTests.cs` exercises the full chain (PdfSharp visual PDF
+  → Spire preview images → eRechnung hybrid/XML) and must stay green.
+- Do **not** upgrade Spire.PDF beyond 8.10.5 (see project libraries rule). The
+  license must never be hard-coded in new code paths — read it from
+  `SpirePdf_License`.
+- Wiring the app's invoice flow to emit eRechnung is the follow-up: map
+  `FdsInvoiceData`/`InvoiceRegistration` → `eRechnungLib.Model.Invoice`
+  (parties, lines, VAT breakdown, payment/IBAN, buyer reference, seller
+  electronic address) and persist/deliver the ZUGFeRD PDF and/or XRechnung XML.
+- eRechnungLib depends only on open-source libraries (PDFsharp/MigraDoc; optional
+  SaxonCS-HE for Schematron) — no new commercial dependency for the structured
+  output itself.
+
+## Alternatives considered
+- **Hand-rolling ZUGFeRD/XRechnung XML** in Fuchs: rejected — EN 16931 + CIUS
+  validation, multiple profiles/syntaxes, and PDF/A-3 embedding are error-prone;
+  a dedicated, validated library is safer.
+- **Rewriting the PDF layout from scratch** rather than porting the legacy module:
+  rejected — the letterhead is a fixed corporate design; the legacy VB is the
+  authoritative spec, so faithful porting avoids visual regressions.
+- **Bundling a Spire license file / hard-coding the key**: rejected in favor of
+  the managed-secret path so the production key is centrally rotated and never
+  committed, with the embedded key only as a dev fallback.
diff --git a/Fuchs/Program.cs b/Fuchs/Program.cs
index ce550e3..b2ad009 100644
--- a/Fuchs/Program.cs
+++ b/Fuchs/Program.cs
@@ -37,6 +37,14 @@ public class Program
         // Key Vault + DPAPI secret management (must run before FuchsOcmsIntranet.Initialize)
         builder.AddSecretManagement();
 
+        // Apply the Spire.PDF license as early as possible — Spire evaluates its license
+        // lazily on the first PDF operation per process and caches the result, so it must be
+        // set before any Spire use (self-test, first render) or the evaluation watermark sticks
+        // for the whole process. Sourced from the SpirePdf-License managed secret (config key
+        // SpirePdf_License, plus tolerated spelling variants); falls back to the embedded key.
+        FuchsPdf.SetLicense(
+            FuchsPdfService.ResolveLicenseFromConfiguration(builder.Configuration, out _));
+
         // Assemble connection strings from templates + resolved credentials.
         // In Development, "_Dev"-suffixed credential keys are preferred so a reachable
         // Key Vault can never override them with production DB credentials.
@@ -87,8 +95,10 @@ public class Program
         // Dev/test safety net: Fuchs:Email:OverrideRecipient redirects every outbound email
         // (see appsettings.Development.json) so real tenant-owners/end-customers are never emailed.
         builder.Services.Configure<FuchsEmailSettings>(builder.Configuration.GetSection("Fuchs:Email"));
+        builder.Services.Configure<StartupSelfTestSettings>(builder.Configuration.GetSection("Fuchs:StartupChecks"));
         builder.Services.AddHttpClient("ProcessWebMailer");
         builder.Services.AddScoped<IComService, ProcessWebComService>();
+        builder.Services.AddHostedService<StartupSelfTestService>();
 
         // Business services (DI migration — replaces the static helper / Active-Record pattern)
         builder.Services.AddSingleton<IBankingService, BankingService>();   // stateless parser
diff --git a/Fuchs/Services/FuchsPdfService.cs b/Fuchs/Services/FuchsPdfService.cs
index 3e05209..ba6d1f8 100644
--- a/Fuchs/Services/FuchsPdfService.cs
+++ b/Fuchs/Services/FuchsPdfService.cs
@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using Fuchs.intranet;
 using Fuchs.Observability;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
 using MigraDoc.DocumentObjectModel;
 
@@ -13,13 +14,90 @@ namespace Fuchs.Services;
 /// </summary>
 public class FuchsPdfService : IPdfService
 {
+    /// <summary>
+    /// Canonical configuration key holding the Spire.PDF license. Sourced from the
+    /// <c>SpirePdf-License</c> managed secret (Key Vault name <c>fuchs--SpirePdf-License</c>):
+    /// the secret-management layer strips the <c>fuchs--</c> app prefix and maps <c>-</c> to
+    /// <c>_</c> per segment, so <c>SpirePdf-License</c> surfaces here as <c>SpirePdf_License</c>.
+    /// </summary>
+    internal const string LicenseConfigKey = "SpirePdf_License";
+
+    /// <summary>
+    /// Placeholder appsettings.json carries for the managed secret until Key Vault (or the
+    /// DPAPI cache) supplies the real value. Treated as "no license configured" so the embedded
+    /// fallback key is used instead of applying this literal as a bogus Spire license key —
+    /// mirrors the convention in <see cref="AzureBlobStorageService"/>.
+    /// </summary>
+    internal const string UnloadedSecretPlaceholder = "MANAGED_BY_KEYVAULT";
+
+    /// <summary>
+    /// Every config-key spelling the license can realistically surface under, tried in order.
+    /// The managed-secret mapping yields <see cref="LicenseConfigKey"/>; the other variants cover
+    /// a value provided verbatim (appsettings), a <c>:</c>-hierarchy, or an app-prefixed key.
+    /// </summary>
+    internal static readonly string[] LicenseConfigKeyCandidates =
+    {
+        LicenseConfigKey,          // SpirePdf_License  (managed-secret mapping)
+        "SpirePdf-License",        // verbatim, e.g. appsettings.Development.json
+        "SpirePdf:License",        // ':'-hierarchy variant
+        "SpirePdfLicense",         // no separator
+        "fuchs:SpirePdf-License",  // default KV manager on the full secret name
+        "Fuchs:SpirePdf_License",
+    };
+
+    /// <summary>
+    /// Resolves the Spire license value from configuration, tolerating the different key spellings
+    /// the secret can surface under. Returns <see langword="null"/> when none carry a value;
+    /// <paramref name="matchedKey"/> reports which candidate matched (or <see langword="null"/>).
+    /// </summary>
+    internal static string? ResolveLicenseFromConfiguration(IConfiguration configuration, out string? matchedKey)
+    {
+        foreach (var key in LicenseConfigKeyCandidates)
+        {
+            string? value = configuration[key];
+            if (!string.IsNullOrWhiteSpace(value) &&
+                !string.Equals(value, UnloadedSecretPlaceholder, StringComparison.Ordinal))
+            {
+                matchedKey = key;
+                return value;
+            }
+        }
+        matchedKey = null;
+        return null;
+    }
+
+    /// <summary>Config keys that look Spire-related, for diagnostics when no candidate matched.</summary>
+    internal static IEnumerable<string> SpireLikeConfigKeys(IConfiguration configuration) =>
+        configuration.AsEnumerable()
+            .Where(kv => kv.Value is not null &&
+                         kv.Key.Contains("spire", StringComparison.OrdinalIgnoreCase))
+            .Select(kv => kv.Key)
+            .Distinct(StringComparer.OrdinalIgnoreCase);
+
     private readonly ILogger<FuchsPdfService> _logger;
 
-    public FuchsPdfService(ILogger<FuchsPdfService> logger)
+    public FuchsPdfService(ILogger<FuchsPdfService> logger, IConfiguration configuration)
     {
         _logger = logger;
-        FuchsPdf.SetLicense();
-        _logger.LogDebug("FuchsPdfService initialised (PDF license applied).");
+        // The license is normally applied once at startup (Program.cs) before any Spire use;
+        // re-applying here is a harmless safety net. If the managed secret is missing, the
+        // embedded fallback key is used — which does NOT license current Spire.PDF and leaves
+        // an evaluation watermark on rendered PDFs, so surface that as a warning.
+        string? licenseKey = ResolveLicenseFromConfiguration(configuration, out string? matchedKey);
+        FuchsPdf.SetLicense(licenseKey);
+        if (string.IsNullOrWhiteSpace(licenseKey))
+        {
+            var spireKeys = SpireLikeConfigKeys(configuration).ToArray();
+            _logger.LogWarning(
+                "Spire.PDF license not found under any known config key ({Candidates}). " +
+                "Config keys containing 'spire': [{FoundKeys}]. Using the embedded fallback key — " +
+                "rendered PDFs may carry the Spire evaluation watermark. Ensure the Key Vault secret " +
+                "'fuchs--SpirePdf-License' is present and reachable, or set it in appsettings.Development.json.",
+                string.Join(", ", LicenseConfigKeyCandidates),
+                spireKeys.Length > 0 ? string.Join(", ", spireKeys) : "(none)");
+        }
+        else
+            _logger.LogInformation("Spire.PDF license applied from config key '{MatchedKey}'.", matchedKey);
     }
 
     public Task<Document> WriteLetterAsync(FuchsPdf.FdsTextBlocks textBlocks, bool draft)
diff --git a/Fuchs/Services/StartupSelfTestService.cs b/Fuchs/Services/StartupSelfTestService.cs
new file mode 100644
index 0000000..91bb1a4
--- /dev/null
+++ b/Fuchs/Services/StartupSelfTestService.cs
@@ -0,0 +1,345 @@
+using Azure;
+using Azure.Security.KeyVault.Secrets;
+using Fuchs.intranet;
+using Microsoft.Data.SqlClient;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace Fuchs.Services;
+
+/// <summary>
+/// One-shot startup self-test that can verify Key Vault connectivity and optionally
+/// send a startup probe email. This service never throws to avoid blocking app startup.
+/// </summary>
+public class StartupSelfTestService : BackgroundService
+{
+    private readonly IServiceProvider _serviceProvider;
+    private readonly IConfiguration _configuration;
+    private readonly StartupSelfTestSettings _settings;
+    private readonly ILogger<StartupSelfTestService> _logger;
+
+    public StartupSelfTestService(
+        IServiceProvider serviceProvider,
+        IConfiguration configuration,
+        IOptions<StartupSelfTestSettings> settings,
+        ILogger<StartupSelfTestService> logger)
+    {
+        _serviceProvider = serviceProvider;
+        _configuration = configuration;
+        _settings = settings.Value;
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        => await RunOnceAsync(stoppingToken);
+
+    internal async Task RunOnceAsync(CancellationToken stoppingToken)
+    {
+        if (!_settings.Enabled)
+        {
+            _logger.LogDebug("StartupSelfTestService skipped - Fuchs:StartupChecks:Enabled is false.");
+            return;
+        }
+
+        bool keyVaultOk = true;
+        bool databaseOk = true;
+        bool mfrOk = true;
+        bool mailerOk = true;
+        bool pdfLicenseOk = true;
+
+        try
+        {
+            if (_settings.CheckKeyVault)
+            {
+                try
+                {
+                    keyVaultOk = await ProbeKeyVaultAsync(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    keyVaultOk = false;
+                    _logger.LogWarning(ex, "Startup Key Vault check failed with an exception.");
+                }
+            }
+
+            if (_settings.CheckDatabase)
+            {
+                try
+                {
+                    databaseOk = await ProbeDatabaseAsync(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    databaseOk = false;
+                    _logger.LogWarning(ex, "Startup database check failed with an exception.");
+                }
+            }
+
+            if (_settings.CheckMfr)
+            {
+                try
+                {
+                    mfrOk = await ProbeMfrAsync(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    mfrOk = false;
+                    _logger.LogWarning(ex, "Startup MFR check failed with an exception.");
+                }
+            }
+
+            if (_settings.CheckPdfLicense)
+            {
+                try
+                {
+                    pdfLicenseOk = await ProbePdfLicenseAsync(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    pdfLicenseOk = false;
+                    _logger.LogWarning(ex, "Startup PDF license check failed with an exception.");
+                }
+            }
+
+            if (_settings.SendStartupEmail)
+            {
+                try
+                {
+                    mailerOk = await SendStartupEmailAsync(stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    mailerOk = false;
+                    _logger.LogWarning(ex, "Startup mailer check failed with an exception.");
+                }
+            }
+
+            _logger.LogInformation(
+                "Startup self-test completed. KeyVaultOk={KeyVaultOk}, DatabaseOk={DatabaseOk}, MfrOk={MfrOk}, MailerOk={MailerOk}, PdfLicenseOk={PdfLicenseOk}",
+                keyVaultOk,
+                databaseOk,
+                mfrOk,
+                mailerOk,
+                pdfLicenseOk);
+        }
+        catch (OperationCanceledException)
+        {
+            _logger.LogWarning("Startup self-test canceled.");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Startup self-test failed unexpectedly.");
+        }
+    }
+
+    protected virtual async Task<bool> ProbeDatabaseAsync(CancellationToken cancellationToken)
+    {
+        string? connectionString = _configuration.GetConnectionString("fuchs_fds_ConnectionString");
+        if (string.IsNullOrWhiteSpace(connectionString))
+        {
+            _logger.LogWarning("Startup database check skipped - ConnectionStrings:fuchs_fds_ConnectionString is empty.");
+            return false;
+        }
+
+        try
+        {
+            await using var connection = new SqlConnection(connectionString);
+            await connection.OpenAsync(cancellationToken);
+            await using var command = new SqlCommand("SELECT 1;", connection);
+            object? scalar = await command.ExecuteScalarAsync(cancellationToken);
+            bool ok = scalar is not null && scalar.ToString() == "1";
+            if (!ok)
+            {
+                _logger.LogWarning("Startup database check failed - SELECT 1 returned '{Value}'.", scalar);
+                return false;
+            }
+
+            _logger.LogInformation("Startup database check succeeded.");
+            return true;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Startup database check failed.");
+            return false;
+        }
+    }
+
+    protected virtual async Task<bool> ProbeMfrAsync(CancellationToken cancellationToken)
+    {
+        try
+        {
+            var factory = _serviceProvider.GetService<IMfrClientFactory>();
+            if (factory is null)
+            {
+                _logger.LogWarning("Startup MFR check skipped - IMfrClientFactory is not registered.");
+                return false;
+            }
+
+            using var client = factory.Create();
+            string entities = await client.GetEntities(throwErrorIfNotOk: true);
+            if (string.IsNullOrWhiteSpace(entities))
+            {
+                _logger.LogWarning("Startup MFR check failed - empty response.");
+                return false;
+            }
+
+            _logger.LogInformation("Startup MFR check succeeded.");
+            return true;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Startup MFR check failed.");
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Verifies the Spire.PDF license: the license string must be configured (present and
+    /// non-empty) and Spire.PDF must actually be licensed. Spire exposes no public validity
+    /// API, so the licensed state is probed by creating a tiny document and checking the
+    /// output for the evaluation watermark it stamps when unlicensed.
+    /// </summary>
+    protected virtual async Task<bool> ProbePdfLicenseAsync(CancellationToken cancellationToken)
+    {
+        string? licenseKey = FuchsPdfService.ResolveLicenseFromConfiguration(_configuration, out string? matchedKey);
+        if (string.IsNullOrWhiteSpace(licenseKey))
+        {
+            var spireKeys = FuchsPdfService.SpireLikeConfigKeys(_configuration).ToArray();
+            _logger.LogWarning(
+                "Startup PDF license check failed - no license found under any known config key ({Candidates}). " +
+                "Config keys containing 'spire': [{FoundKeys}]. Rendered PDFs will carry the Spire evaluation watermark.",
+                string.Join(", ", FuchsPdfService.LicenseConfigKeyCandidates),
+                spireKeys.Length > 0 ? string.Join(", ", spireKeys) : "(none)");
+            return false;
+        }
+
+        _logger.LogInformation("Startup PDF license check - license found under config key '{MatchedKey}'.", matchedKey);
+        // Ensure the configured key is applied, then confirm Spire is not in evaluation mode.
+        FuchsPdf.SetLicense(licenseKey);
+        bool licensed = await Task.Run(SpirePdfIsLicensed, cancellationToken);
+
+        if (licensed)
+            _logger.LogInformation("Startup PDF license check succeeded - Spire.PDF is licensed.");
+        else
+            _logger.LogWarning(
+                "Startup PDF license check failed - Spire.PDF is in evaluation mode. The configured " +
+                "license key was rejected or does not cover this Spire.PDF version.");
+        return licensed;
+    }
+
+    /// <summary>
+    /// Returns <see langword="true"/> when Spire.PDF is licensed. Detects the evaluation edition
+    /// by rendering a minimal document and checking the extracted text for the watermark Spire
+    /// stamps on documents it creates while unlicensed.
+    /// </summary>
+    internal static bool SpirePdfIsLicensed()
+    {
+        try
+        {
+            using var doc = new Spire.Pdf.PdfDocument();
+            var page = doc.Pages.Add();
+            page.Canvas.DrawString(
+                "license probe",
+                new Spire.Pdf.Graphics.PdfFont(Spire.Pdf.Graphics.PdfFontFamily.Helvetica, 10f),
+                Spire.Pdf.Graphics.PdfBrushes.Black,
+                10f, 10f);
+
+            using var ms = new MemoryStream();
+            doc.SaveToStream(ms, Spire.Pdf.FileFormat.PDF);
+            ms.Position = 0;
+
+            using var check = new Spire.Pdf.PdfDocument();
+            check.LoadFromStream(ms);
+            string text = check.Pages[0].ExtractText();
+
+            return !text.Contains("Evaluation Warning", StringComparison.OrdinalIgnoreCase)
+                && !text.Contains("created with Spire.PDF", StringComparison.OrdinalIgnoreCase);
+        }
+        catch
+        {
+            // A malformed/rejected license key makes Spire throw during validation on save;
+            // any failure to produce a clean licensed document means "not licensed".
+            return false;
+        }
+    }
+
+    protected virtual async Task<bool> ProbeKeyVaultAsync(CancellationToken cancellationToken)
+    {
+        string appName = _configuration["SecretManagement:AppName"] ?? "";
+        string[] managedKeys = _configuration.GetSection("SecretManagement:ManagedSecretKeys").Get<string[]>() ?? [];
+
+        if (string.IsNullOrWhiteSpace(appName) || managedKeys.Length == 0)
+        {
+            _logger.LogWarning("Startup Key Vault check skipped - SecretManagement settings are incomplete.");
+            return false;
+        }
+
+        var secretClient = _serviceProvider.GetService<SecretClient>();
+        if (secretClient is null)
+        {
+            _logger.LogWarning("Startup Key Vault check skipped - SecretClient is not registered.");
+            return false;
+        }
+
+        string probeName = $"{appName}--{managedKeys[0]}";
+
+        try
+        {
+            KeyVaultSecret secret = await secretClient.GetSecretAsync(probeName, version: null, cancellationToken);
+            if (string.IsNullOrWhiteSpace(secret.Value))
+            {
+                _logger.LogWarning("Startup Key Vault check failed - secret '{SecretName}' is empty.", probeName);
+                return false;
+            }
+
+            _logger.LogInformation("Startup Key Vault check succeeded using '{SecretName}'.", probeName);
+            return true;
+        }
+        catch (RequestFailedException ex)
+        {
+            _logger.LogWarning(ex, "Startup Key Vault check failed for '{SecretName}' with status {Status}.", probeName, ex.Status);
+            return false;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Startup Key Vault check failed for '{SecretName}'.", probeName);
+            return false;
+        }
+    }
+
+    protected virtual async Task<bool> SendStartupEmailAsync(CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(_settings.StartupEmailRecipient))
+        {
+            _logger.LogWarning("Startup mailer check skipped - StartupEmailRecipient is empty.");
+            return false;
+        }
+
+        using var scope = _serviceProvider.CreateScope();
+        var comService = scope.ServiceProvider.GetRequiredService<IComService>();
+
+        string subject = $"[Startup] Fuchs Intranet started on {Environment.MachineName}";
+        string html = $"<p>Fuchs Intranet startup probe.</p>" +
+                      $"<p>UTC: {DateTimeOffset.UtcNow:O}<br/>Machine: {Environment.MachineName}</p>";
+
+        bool sent = await comService.SendEmailAsync(
+            "startup_probe",
+            subject,
+            html,
+            _settings.StartupEmailRecipient,
+            _settings.StartupEmailRecipientName,
+            attachments: null);
+
+        if (!sent)
+        {
+            _logger.LogWarning("Startup mailer check failed - probe email was not accepted by IComService.");
+            return false;
+        }
+
+        _logger.LogInformation("Startup mailer check succeeded.");
+        return true;
+    }
+}
diff --git a/Fuchs/Services/StartupSelfTestSettings.cs b/Fuchs/Services/StartupSelfTestSettings.cs
new file mode 100644
index 0000000..5c54f5d
--- /dev/null
+++ b/Fuchs/Services/StartupSelfTestSettings.cs
@@ -0,0 +1,47 @@
+namespace Fuchs.Services;
+
+/// <summary>
+/// Optional one-shot startup self-test settings, bound from "Fuchs:StartupChecks".
+/// Disabled by default to avoid accidental startup emails in production.
+/// </summary>
+public class StartupSelfTestSettings
+{
+    public bool Enabled { get; set; } = false;
+
+    /// <summary>
+    /// When enabled, verifies Key Vault access by reading one managed secret.
+    /// </summary>
+    public bool CheckKeyVault { get; set; } = true;
+
+    /// <summary>
+    /// When enabled, verifies SQL database connectivity by executing SELECT 1.
+    /// </summary>
+    public bool CheckDatabase { get; set; } = true;
+
+    /// <summary>
+    /// When enabled, verifies MFR API connectivity using the configured client credentials.
+    /// </summary>
+    public bool CheckMfr { get; set; } = true;
+
+    /// <summary>
+    /// When enabled, verifies that a Spire.PDF license string is configured (present and
+    /// non-empty) and that Spire.PDF is actually licensed (not running in evaluation mode).
+    /// </summary>
+    public bool CheckPdfLicense { get; set; } = true;
+
+    /// <summary>
+    /// When enabled, sends a startup probe email via <see cref="IComService"/>.
+    /// This applies to all environments, including Production.
+    /// </summary>
+    public bool SendStartupEmail { get; set; } = false;
+
+    /// <summary>
+    /// Recipient address for startup probe emails.
+    /// </summary>
+    public string StartupEmailRecipient { get; set; } = "";
+
+    /// <summary>
+    /// Recipient display name for startup probe emails.
+    /// </summary>
+    public string StartupEmailRecipientName { get; set; } = "Startup Monitor";
+}
diff --git a/Fuchs/appsettings.Development.json b/Fuchs/appsettings.Development.json
index d22416c..5cf9ec1 100644
--- a/Fuchs/appsettings.Development.json
+++ b/Fuchs/appsettings.Development.json
@@ -6,15 +6,24 @@
   },
   "Logging": {
     "LogLevel": {
-      "Default": "Warning",
-      "Microsoft.AspNetCore": "Warning",
-      "Microsoft.Hosting.Lifetime": "Information"
+      "Default": "Debug",
+      "Microsoft.AspNetCore": "Debug",
+      "Microsoft.Hosting.Lifetime": "Debug",
+      "fds": "Debug",
+      "Fuchs.Controllers": "Debug"
     }
   },
   "Fuchs": {
     "FDS_Intranet_DebugState": true,
     "DevAutoLogin": true,
     "DevAutoLoginEmail": "info@processweb.de",
+    "StartupChecks": {
+      "Enabled": true,
+      "CheckKeyVault": false,
+      "CheckDatabase": false,
+      "CheckMfr": false,
+      "CheckPdfLicense": true
+    },
     "Email": {
       "OverrideRecipient": "service@emails.processweb.de"
     },
diff --git a/Fuchs/appsettings.json b/Fuchs/appsettings.json
index 03dbbc9..d546cb8 100644
--- a/Fuchs/appsettings.json
+++ b/Fuchs/appsettings.json
@@ -13,7 +13,8 @@
       "Fuchs--fuchs-captcha-TOTP",
       "Fuchs--fuchs-intranet-TOTP",
       "Fds--MFR-UserName",
-      "Fds--MFR-Password"
+      "Fds--MFR-Password",
+      "SpirePdf-License"
     ]
   },
   "Logging": {
@@ -23,6 +24,7 @@
     }
   },
   "AllowedHosts": "*",
+  "SpirePdf_License": "MANAGED_BY_KEYVAULT",
   "ConnectionStrings": {
     "fuchs_fds_ConnectionString": "Data Source=MSSQL4.NBG4.DOMAINXYZ.DE,10439;Initial Catalog=site_fuchs_dev;Persist Security Info=False;TrustServerCertificate=true;Encrypt=true;User ID={username};password='{password}';Connect Timeout=60;Load Balance Timeout=240;Max Pool Size=500;",
     "fuchs_fds_username": "MANAGED_BY_KEYVAULT",
@@ -40,13 +42,22 @@
     "SMS_APIKey": "MANAGED_BY_KEYVAULT",
     "Mailer": {
       "BaseUrl": "https://api.processweb.de",
-      "AccountId": "",
+      "AccountId": "82d87114-c8c3-4d33-95e5-4c781a9229ab",
       "Token": "MANAGED_BY_KEYVAULT",
       "Enabled": false
     },
     "Email": {
       "OverrideRecipient": ""
     },
+    "StartupChecks": {
+      "Enabled": false,
+      "CheckKeyVault": true,
+      "CheckDatabase": true,
+      "CheckMfr": true,
+      "SendStartupEmail": true,
+      "StartupEmailRecipient": "",
+      "StartupEmailRecipientName": "Startup Monitor"
+    },
     "AzureStorage": {
       "Enabled": false,
       "InvoiceContainer": "fuchs-invoices",
diff --git a/Fuchs/code/FuchsPdf.cs b/Fuchs/code/FuchsPdf.cs
index 0ddd3ed..e2075a8 100644
--- a/Fuchs/code/FuchsPdf.cs
+++ b/Fuchs/code/FuchsPdf.cs
@@ -22,8 +22,23 @@ public static class FuchsPdf
     public const           string      ProjectAbbreviation = "fuchs";
 
     // ── Spire license ─────────────────────────────────────────────────────────
-    public static void SetLicense() =>
-        Spire.License.LicenseProvider.SetLicenseKey(
+    /// <summary>
+    /// Applies the Spire.PDF license. The key is supplied by the caller from the
+    /// <c>SpirePdf-License</c> managed secret (config key <c>SpirePdf_License</c>);
+    /// when no key is provided the embedded fallback key is used so PDF rendering
+    /// still works in local/dev setups without Key Vault access.
+    /// </summary>
+    public static void SetLicense(string? licenseKey = null) =>
+        Spire.License.LicenseProvider.SetLicenseKey(ResolveLicenseKey(licenseKey));
+
+    /// <summary>
+    /// Chooses the effective Spire license key: the managed-secret value when present,
+    /// otherwise the embedded fallback. Pure/side-effect-free for testability.
+    /// </summary>
+    internal static string ResolveLicenseKey(string? licenseKey) =>
+        string.IsNullOrWhiteSpace(licenseKey) ? EmbeddedLicenseKey : licenseKey;
+
+    private const string EmbeddedLicenseKey =
             "I+ztXu/77JVCXwEAwVQwRISgL4qlo1lOxO6csGdd02iJsOnMzEkqjhRx6oJ5rw5fgaF5wUf83LWMWwLE8PNc" +
             "/ZGUZIa8mTx9ovjM9fK2+xLk/VC3s555Qhd5+PLfgxIEsp4r6lw03P7YPvD6pvM745VQg0dd8thRoznmkWrkUf" +
             "/2/MiUZyUyVrH+qyEZgkniqpuDdqoaUNx1RfsK6TyiKKB7nsiqDy9xrduuYCMgOg1wii3aU+anA/pHUYh/jMO0" +
@@ -41,7 +56,7 @@ public static class FuchsPdf
             "uUg5LlJmPPXkTKHQJ/CM6EQkqIS4Foz7pBaaYRBgEz/zDujxbYUGN6LaJiANung4Zyl6k5arhHdCalRDe29avN1o" +
             "vxe/5tUHQQDxq+yQ1cNChPJTFHR1bKKu0T7SW7p19qH5850rXcjtzK4+6zGYXq8HItH6UNiev27o9VUoKTv+XZiD" +
             "27YE33vdwQHh5Kdc8CMMo+uaTI11uLBirUH63Na2oBkCGJjJzQk8Gc5NQs7+2DptJ/rNlOhwb/czZLB6OjH+vNCy" +
-            "HZBCGPd17rIW16JQzgWv+OBI9DbD7pXYzDyF++IrBiRKBPNKCTwg3trm89J4zWeGW80bFtD0QnIcArA==");
+            "HZBCGPd17rIW16JQzgWv+OBI9DbD7pXYzDyF++IrBiRKBPNKCTwg3trm89J4zWeGW80bFtD0QnIcArA==";
 
     // ── Colors ────────────────────────────────────────────────────────────────
     private static readonly Color FuchsGray = Color.FromRgb(128, 128, 128);
@@ -193,21 +208,36 @@ public static class FuchsPdf
         DefineStyles_Letter(doc, Array.Empty<Style>(), tgtFont);
 
         var section = doc.AddSection();
-        section.PageSetup.TopMargin    = cm(1.8);
-        section.PageSetup.BottomMargin = cm(1.8);
+        section.PageSetup.PageHeight = doc.DefaultPageSetup.PageHeight;
+        section.PageSetup.PageWidth  = doc.DefaultPageSetup.PageWidth;
+
+        // Bottom margin reserves room for the four footer blocks + page-number row,
+        // exactly as the legacy layout computed it (22.5mm footer block + 2× the ISO
+        // page-number margin + one page-number row). A too-small bottom margin was one
+        // cause of body text overrunning the footer.
+        Unit isoPageNumMargin = mm(10);
+        Unit pageNumRowHeight = mm(doc.Styles["PageNumStyle"]!.Font.Size.Millimeter);
+        section.PageSetup.TopMargin    = cm(2.0);
+        section.PageSetup.BottomMargin = new Unit(
+            22.5 + 2 * isoPageNumMargin.Millimeter + pageNumRowHeight.Millimeter, UnitType.Millimeter);
         section.PageSetup.LeftMargin   = cm(2.5);
         section.PageSetup.RightMargin  = cm(2.0);
         section.PageSetup.DifferentFirstPageHeaderFooter = true;
+        section.PageSetup.HeaderDistance = cm(0);
 
         string dataBase = Path.Combine(AppContext.BaseDirectory, "Data");
 
-        // ── Header logos ──────────────────────────────────────────────────────
-        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image1.png"),
-            width: mm(155.5), top: cm(0.79), left: cm(2.0));
-        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image2.png"),
-            width: mm(34.5), top: cm(0.59), left: cm(15.27));
-        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image3.png"),
-            width: mm(25.4), top: cm(6.21), left: cm(17.51));
+        // ── Header logos (top-right corner of the letterhead) ─────────────────
+        // NOTE: the shipped assets are image1-3.jpeg + image4.png. Referencing the
+        // wrong extension made AddHeaderImage silently skip them (File.Exists == false),
+        // which is why the letterhead logos vanished. Sizes/positions match the legacy
+        // CreatePage_letter.
+        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image1.jpeg"),
+            width: mm(39.3), top: cm(1.73), left: cm(16.07));
+        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image2.jpeg"),
+            width: mm(25.4), top: cm(4.89), left: cm(17.5));
+        AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image3.jpeg"),
+            width: mm(26.0), top: cm(6.21), left: cm(17.51));
         AddHeaderImage(section.Headers.FirstPage, Path.Combine(dataBase, "image4.png"),
             width: mm(25.4), top: cm(7.79), left: cm(17.5));
 
@@ -243,12 +273,16 @@ public static class FuchsPdf
         {
             var tf = section.Headers.FirstPage.AddTextFrame();
             tf.RelativeVertical   = RelativeVertical.Page;
-            tf.RelativeHorizontal = RelativeHorizontal.Page;
-            tf.Top = cm(4.65); tf.Left = cm(2.0);
-            tf.Width = cm(8.5); tf.Height = cm(0.6);
+            tf.RelativeHorizontal = RelativeHorizontal.Margin;
+            tf.Left = ShapePosition.Left;
+            tf.Top = cm(5.3);
+            tf.Width = cm(14); tf.Height = mm(12.5);
             var p = tf.AddParagraph();
             p.Style = "AddressBoxSender";
-            p.AddText($"{tb.SenderLine1} \u25cf {tb.SenderLine2}");
+            if (!string.IsNullOrEmpty(tb.SenderLine1))
+                p.AddFormattedText(tb.SenderLine1, TextFormat.Bold);
+            p.AddText(" " + tb.SenderLine2);
+            tf.WrapFormat.Style = WrapStyle.Through;
         }
 
         // ── Recipient address box ─────────────────────────────────────────────
@@ -258,6 +292,7 @@ public static class FuchsPdf
             tf.RelativeHorizontal = RelativeHorizontal.Page;
             tf.Top = cm(5.6); tf.Left = cm(2.0);
             tf.Width = cm(9); tf.Height = cm(4);
+            tf.MarginLeft = cm(0.5); tf.MarginRight = cm(0.5); tf.MarginBottom = cm(0.5);
             tf.MarginTop = cm(0.2);
             if (tb.Address.Length > 0)
             {
@@ -267,26 +302,28 @@ public static class FuchsPdf
             }
         }
 
-        // ── Admin info block (right side) ─────────────────────────────────────
+        // ── Admin info block (right column, label over value) ─────────────────
         {
             var tf = section.Headers.FirstPage.AddTextFrame();
             tf.RelativeVertical   = RelativeVertical.Page;
             tf.RelativeHorizontal = RelativeHorizontal.Page;
-            tf.Top = cm(5.6); tf.Left = cm(13.0);
-            tf.Width = cm(5.5); tf.Height = cm(5.5);
-            void Row(string label, string value)
+            tf.Top = mm(52.5); tf.Left = cm(12.87);
+            tf.Width = cm(5); tf.Height = cm(12);
+            bool first = true;
+            void Block(string label, string value)
             {
-                var p = tf.AddParagraph(); p.Style = "AdminInfo";
-                p.AddFormattedText(label + ": ", TextFormat.Bold);
+                var p = tf.AddParagraph(); p.Style = "AdminBlock";
+                if (first) { p.Format.SpaceBefore = 0; first = false; }
+                p.AddFormattedText(label, "AdminBlockHead");
+                p.AddLineBreak();
                 p.AddText(value);
             }
-            Row(tb.AdminDatumLabel,  tb.AdminDatum);
-            if (!string.IsNullOrEmpty(tb.AdminRef))
-                Row("Nummer", tb.AdminRef);
-            if (!string.IsNullOrEmpty(tb.ProvisionPeriod))
-                Row(tb.AdminProvLabel, tb.ProvisionPeriod);
-            Row("Sachbearbeiter", tb.AdminUser);
-            Row("E-Mail",         tb.AdminUserEmail);
+            Block("Bearbeiter",       (tb.AdminUser       ?? "").ne(" "));
+            Block("Email",            (tb.AdminUserEmail  ?? "").ne("-"));
+            Block(tb.AdminDatumLabel, (tb.AdminDatum      ?? "").ne("-"));
+            Block(tb.AdminProvLabel,  (tb.ProvisionPeriod ?? "").ne("-"));
+            Block("Nummer",           (tb.AdminRef        ?? "").ne("-"));
+            tf.WrapFormat.Style = WrapStyle.Through;
         }
 
         // ── Ort und Zeit ──────────────────────────────────────────────────────
@@ -304,10 +341,25 @@ public static class FuchsPdf
             p.Format.Alignment  = ParagraphAlignment.Right;
         }
 
-        // ── Footer (all pages) ────────────────────────────────────────────────
-        AddLetterFooter(section.Footers.Primary,    tb, tgtFont);
-        AddLetterFooter(section.Footers.FirstPage,  tb, tgtFont);
-        AddLetterFooter(section.Footers.EvenPage,   tb, tgtFont);
+        // ── Footer blocks + page numbers (first page + all following pages) ───
+        AddLetterFooterBlocks(section, section.Footers.Primary,   tb);
+        AddLetterFooterBlocks(section, section.Footers.FirstPage, tb);
+        AddPageNumber(section, section.Footers.Primary,   isoPageNumMargin, pageNumRowHeight);
+        AddPageNumber(section, section.Footers.FirstPage, isoPageNumMargin, pageNumRowHeight);
+
+        // MigraDoc drops SpaceBefore on the very first body paragraph of a page. The letter
+        // body must start ~10 cm down (below the floating address window / admin block), which
+        // the invoice title / subject achieve via a large SpaceBefore — but only if they are
+        // not the first paragraph. This tiny empty anchor absorbs the first-paragraph
+        // suppression so the following content's SpaceBefore (the letterhead offset) is honored.
+        {
+            var anchor = section.AddParagraph();
+            anchor.Format.Font.Size = 1;
+            anchor.Format.SpaceBefore = 0;
+            anchor.Format.SpaceAfter  = 0;
+            anchor.Format.LineSpacingRule = LineSpacingRule.Exactly;
+            anchor.Format.LineSpacing = pt(1);
+        }
 
         // ── Subject + body ────────────────────────────────────────────────────
         if (!string.IsNullOrEmpty(tb.Subject))
@@ -339,8 +391,10 @@ public static class FuchsPdf
         normal.Font.Name = tgtFont;
         normal.Font.Size = 11;
 
-        AddStyle(doc, "PageNumStyle",  "Normal", s => s.Font.Size = 9);
+        AddStyle(doc, "PageNumStyle",  "Normal", s => s.Font.Size = 10);
         AddStyle(doc, "BodyText",      "Normal", s => { s.Font.Size = 11; s.ParagraphFormat.LineSpacing = 1.15; s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Multiple; });
+        // Base style for MigraDoc tables (invoice/reminder item grids reference "Table").
+        AddStyle(doc, "Table",         "Normal", s => { s.Font.Name = tgtFont; s.Font.Size = 11; s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Single; });
         AddStyle(doc, "AddressBox",    "Normal", s => { s.Font.Size = 10; s.Font.Name = tgtFont; });
         AddStyle(doc, "AddressBoxSender", "Normal", s => { s.Font.Size = 7; s.Font.Name = tgtFont; s.Font.Color = FuchsGray; });
         AddStyle(doc, "AdminInfo",     "Normal", s => s.Font.Size = 9);
@@ -367,6 +421,51 @@ public static class FuchsPdf
     {
         if (!SystemFontExists(tgtFont)) tgtFont = "Arial";
 
+        var normal = doc.Styles["Normal"]!;
+        normal.Font.Name  = tgtFont;
+        normal.Font.Color = Colors.Black;
+
+        AddStyle(doc, "BodyText", "Normal", s => { s.Font.Name = tgtFont; s.Font.Size = baseSize; });
+
+        // ── Letterhead frame styles (ported 1:1 from legacy fuchs_fds_pdf.vb) ──
+        AddStyle(doc, "AdminBlockHead", "Normal", s =>
+            s.Font = new Font(tgtFont, 9) { Color = FuchsGray, Bold = true });
+        AddStyle(doc, "AdminBlock", "Normal", s =>
+        {
+            s.Font = new Font(tgtFont, 9) { Color = Colors.Black, Bold = false };
+            s.ParagraphFormat.SpaceBefore     = cm(0.25);
+            s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Exactly;
+            s.ParagraphFormat.LineSpacing     = pt(9 * 1.2);
+        });
+        AddStyle(doc, "FooterBlock", "Normal", s =>
+        {
+            s.Font = new Font(tgtFont, 7) { Color = FuchsBlau };
+            s.ParagraphFormat.Alignment       = ParagraphAlignment.Left;
+            s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Exactly;
+            s.ParagraphFormat.LineSpacing     = pt(7.5);
+        });
+        AddStyle(doc, "AddressBoxSender", "Normal", s =>
+        {
+            s.Font = new Font(tgtFont, 7.5) { Color = FuchsBlau };
+            s.ParagraphFormat.Alignment       = ParagraphAlignment.Left;
+            s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Exactly;
+            s.ParagraphFormat.LineSpacing     = pt(7.5);
+        });
+        AddStyle(doc, "AddressBox", "Normal", s =>
+        {
+            s.Font = new Font(tgtFont, 10) { Color = Colors.Black };
+            s.ParagraphFormat.Alignment       = ParagraphAlignment.Left;
+            s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Exactly;
+            s.ParagraphFormat.LineSpacing     = pt(12);
+        });
+        AddStyle(doc, "PageNumStyle", "Normal", s =>
+        {
+            s.Font = new Font(tgtFont, 10) { Color = Colors.Black };
+            s.ParagraphFormat.Alignment       = ParagraphAlignment.Right;
+            s.ParagraphFormat.LineSpacingRule = LineSpacingRule.Exactly;
+            s.ParagraphFormat.LineSpacing     = pt(10);
+        });
+
         AddStyle(doc, "SubjectBig", "Normal",   s => { s.Font.Name = tgtFont; s.Font.Size = 13; s.Font.Bold = true; });
         AddStyle(doc, "HorizontalRule", "Normal", s =>
         {
@@ -618,9 +717,20 @@ public static class FuchsPdf
     // ── ApplyReminder ─────────────────────────────────────────────────────────
     public static void ApplyReminder(Document doc, FdsTextBlocks tb, FdsReminderData rem, bool draft = false)
     {
+        Apply_Invoice_Styles(doc);
         var sec = doc.Sections.Cast<Section>().First();
         string rtype = rem.ReminderType;
 
+        // Title — carries the letterhead top offset so the body starts below the address
+        // window / admin block (see the anchor note in CreatePage_Letter).
+        {
+            var p = sec.AddParagraph();
+            p.Style = "SubjectBig";
+            p.Format.SpaceBefore = cm(8.65);
+            p.Format.SpaceAfter  = cm(0.5);
+            p.AddText(rem.ReminderTitle.ne("Zahlungserinnerung"));
+        }
+
         // Opening text
         if (tb.ReminderTexts_before.TryGetValue(rtype, out var intro))
         {
@@ -706,9 +816,24 @@ public static class FuchsPdf
 
     // ── PDF rendering helpers ─────────────────────────────────────────────────
 
+    /// <summary>
+    /// Ensures PdfSharp's global font resolver is the OCORE one before any MigraDoc rendering.
+    /// PdfSharp 6+ no longer resolves system fonts (e.g. "Courier New") on its own — without this,
+    /// PdfDocumentRenderer.RenderDocument() throws "cannot be resolved for predefined error font".
+    /// </summary>
+    private static void EnsureFontResolver()
+    {
+        if (PdfSharp.Fonts.GlobalFontSettings.FontResolver == null ||
+            PdfSharp.Fonts.GlobalFontSettings.FontResolver.GetType() != typeof(OCORE_web_pdf.pdf.OCOREFontResolver))
+        {
+            PdfSharp.Fonts.GlobalFontSettings.FontResolver = new OCORE_web_pdf.pdf.OCOREFontResolver();
+        }
+    }
+
     /// <summary>Renders a MigraDoc Document to a PDF/A byte array.</summary>
     public static byte[] DocToPdfBytes(Document doc)
     {
+        EnsureFontResolver();
         var renderer = new PdfDocumentRenderer() { Document = doc };
         renderer.RenderDocument();
         using var ms = new MemoryStream();
@@ -771,30 +896,51 @@ public static class FuchsPdf
         img.WrapFormat.Style   = WrapStyle.Through;
     }
 
-    private static void AddLetterFooter(HeaderFooter footer, FdsTextBlocks tb, string font)
+    /// <summary>
+    /// Draws the four bottom-of-page footer text blocks (company / liability / contact / bank)
+    /// as absolutely positioned text frames, matching the legacy fuchs_fds_pdf.vb layout.
+    /// </summary>
+    private static void AddLetterFooterBlocks(Section section, HeaderFooter footer, FdsTextBlocks tb)
     {
-        // Horizontal rule
-        var rule = footer.AddParagraph(); rule.Style = "FooterText";
-        rule.Format.Borders.Top.Width = 0.5;
-        rule.Format.Borders.Top.Color = FuchsGray;
-        rule.Format.SpaceBefore = 4;
-
-        // Four-column footer table
-        var tbl = footer.AddTable();
-        tbl.Format.Font.Name = font; tbl.Format.Font.Size = 8;
-        tbl.Format.Font.Color = FuchsGray;
-        tbl.Borders.Visible = false;
-        double[] widths = { 4.2, 4.8, 4.2, 4.8 };
-        foreach (double w in widths) tbl.AddColumn(cm(w));
-        var row = tbl.AddRow(); row.HeightRule = RowHeightRule.Auto;
         string[][] blocks = { tb.FooterBlock1, tb.FooterBlock2, tb.FooterBlock3, tb.FooterBlock4 };
+        double topMm = section.PageSetup.PageHeight.Millimeter - 25;
         for (int col = 0; col < 4; col++)
         {
-            var p = row.Cells[col].AddParagraph();
+            var tf = footer.AddTextFrame();
+            tf.RelativeHorizontal = RelativeHorizontal.Page;
+            tf.RelativeVertical   = RelativeVertical.Page;
+            tf.Left   = cm(2.5 + col * 4.25);
+            tf.Top    = mm(topMm);
+            tf.Width  = cm(4.5);
+            tf.Height = cm(2);
+            tf.MarginTop = 0; tf.MarginBottom = 0; tf.MarginLeft = 0; tf.MarginRight = 0;
+            var p = tf.AddParagraph();
+            p.Style = "FooterBlock";
             foreach (string line in blocks[col]) { p.AddText(line); p.AddLineBreak(); }
         }
     }
 
+    /// <summary>Adds the right-aligned "Seite X von Y" page-number frame below the bottom margin.</summary>
+    private static void AddPageNumber(Section section, HeaderFooter footer, Unit isoMargin, Unit rowHeight)
+    {
+        var tf = footer.AddTextFrame();
+        tf.RelativeHorizontal = RelativeHorizontal.Margin;
+        tf.RelativeVertical   = RelativeVertical.Page;
+        tf.Left = ShapePosition.Right;
+        tf.Top  = mm(section.PageSetup.PageHeight.Millimeter
+                     - section.PageSetup.BottomMargin.Millimeter + isoMargin.Millimeter);
+        tf.Width  = cm(4.5);
+        tf.Height = rowHeight;
+        tf.MarginTop = 0; tf.MarginBottom = 0; tf.MarginLeft = 0; tf.MarginRight = 0;
+        var p = tf.AddParagraph();
+        p.Style = "PageNumStyle";
+        p.Format.Alignment = ParagraphAlignment.Right;
+        p.AddText("Seite ");
+        p.AddPageField();
+        p.AddText(" von ");
+        p.AddNumPagesField();
+    }
+
     /// <summary>
     /// Renders the SEPA "GiroCode" payment QR (EPC069-12) into a two-column box,
     /// matching the legacy fuchs_fds_pdf.vb invoice/reminder layout. No-op on failure.
diff --git a/Fuchs/wwwroot/web/tools.js b/Fuchs/wwwroot/web/tools.js
index ceb47a5..f36c9c0 100644
--- a/Fuchs/wwwroot/web/tools.js
+++ b/Fuchs/wwwroot/web/tools.js
@@ -1,4 +1,5 @@
-/*! js-cookie v3.0.1 | MIT */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self,function(){var n=e.Cookies,o=e.Cookies=t();o.noConflict=function(){return e.Cookies=n,o}}())}(this,(function(){"use strict";function e(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var o in n)e[o]=n[o]}return e}var t=function t(n,o){function r(t,r,i){if("undefined"!=typeof document){"number"==typeof(i=e({},o,i)).expires&&(i.expires=new Date(Date.now()+864e5*i.expires)),i.expires&&(i.expires=i.expires.toUTCString()),t=encodeURIComponent(t).replace(/%(2[346B]|5E|60|7C)/g,decodeURIComponent).replace(/[()]/g,escape);var c="";for(var u in i)i[u]&&(c+="; "+u,!0!==i[u]&&(c+="="+i[u].split(";")[0]));return document.cookie=t+"="+n.write(r,t)+c}}return Object.create({set:r,get:function(e){if("undefined"!=typeof document&&(!arguments.length||e)){for(var t=document.cookie?document.cookie.split("; "):[],o={},r=0;r<t.length;r++){var i=t[r].split("="),c=i.slice(1).join("=");try{var u=decodeURIComponent(i[0]);if(o[u]=n.read(c,u),e===u)break}catch(e){}}return e?o[e]:o}},remove:function(t,n){r(t,"",e({},n,{expires:-1}))},withAttributes:function(n){return t(this.converter,e({},this.attributes,n))},withConverter:function(n){return t(e({},this.converter,n),this.attributes)}},{attributes:{value:Object.freeze(o)},converter:{value:Object.freeze(n)}})}({read:function(e){return'"'===e[0]&&(e=e.slice(1,-1)),e.replace(/(%[\dA-F]{2})+/gi,decodeURIComponent)},write:function(e){return encodeURIComponent(e).replace(/%(2[346BF]|3[AC-F]|40|5[BDE]|60|7[BCD])/g,decodeURIComponent)}},{path:"/"});return t}));
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diff --git a/Fuchs_Database/dbo/Stored Procedures/fds__admin_getReportCatalog.sql b/Fuchs_Database/dbo/Stored Procedures/fds__admin_getReportCatalog.sql
index c2fc5e4..bc018c9 100644
--- a/Fuchs_Database/dbo/Stored Procedures/fds__admin_getReportCatalog.sql	
+++ b/Fuchs_Database/dbo/Stored Procedures/fds__admin_getReportCatalog.sql	
@@ -31,7 +31,7 @@ BEGIN
   
   --WITH nfo as (SELECT * FROM [dbo].[ctm__generic] where [typ] = 'udp_info')  
  WITH nfo as (SELECT *, ROW_NUMBER() OVER (ORDER BY [category],[display_order],[key]) as '#' FROM [dbo].[fds__admin_reportcatalog]) 
-  ,report_objects as (SELECT [object_id], [name] FROM [site_fuchs].[sys].[all_objects] WHERE [type_desc] = 'SQL_STORED_PROCEDURE' AND [schema_id] = 1 and (([name] like 'fds[_][_]r[_]%' or [name] like 'fds[_][_]xls[_]%') and [name] COLLATE SQL_Latin1_General_CP1_CI_AS not in ('ctm_r_base'))   )  
+  ,report_objects as (SELECT [object_id], [name] FROM [sys].[all_objects] WHERE [type_desc] = 'SQL_STORED_PROCEDURE' AND [schema_id] = 1 and (([name] like 'fds[_][_]r[_]%' or [name] like 'fds[_][_]xls[_]%') and [name] COLLATE SQL_Latin1_General_CP1_CI_AS not in ('ctm_r_base'))   )  
  INSERT INTO @PROCEDURES ([object_id], [typ], [ctype], [name], [label], [description], [tags_csv], [categories_csv], [link], [functions], [refresh], [auth], [help_url], [display_order])  
   SELECT o.[object_id]  
     , [typ]  = ISNULL(SUBSTRING([name], PATINDEX('%[_]%[_]%', [name]) + 1, CHARINDEX('_', [name], PATINDEX('%[_]%[_]%', [name]) + 1) - PATINDEX('%[_]%[_]%', [name]) - 1),'s')  
diff --git a/Fuchs_Intranet.slnx b/Fuchs_Intranet.slnx
index 6256fad..74242ee 100644
--- a/Fuchs_Intranet.slnx
+++ b/Fuchs_Intranet.slnx
@@ -8,6 +8,23 @@
     <Platform Name="x64" />
     <Platform Name="x86" />
   </Configurations>
+  <Folder Name="/eRechnungLib/" />
+  <Folder Name="/eRechnungLib/src/">
+    <Project Path="eRechnungLib/src/eRechnungLib.Validation.Saxon/eRechnungLib.Validation.Saxon.csproj">
+      <BuildType Solution="db-dev.processweb.de|*" Project="Debug" />
+      <BuildType Solution="server02.processweb.de|*" Project="Debug" />
+    </Project>
+    <Project Path="eRechnungLib/src/eRechnungLib/eRechnungLib.csproj">
+      <BuildType Solution="db-dev.processweb.de|*" Project="Debug" />
+      <BuildType Solution="server02.processweb.de|*" Project="Debug" />
+    </Project>
+  </Folder>
+  <Folder Name="/eRechnungLib/tests/">
+    <Project Path="eRechnungLib/tests/eRechnungLib.Tests/eRechnungLib.Tests.csproj">
+      <BuildType Solution="db-dev.processweb.de|*" Project="Debug" />
+      <BuildType Solution="server02.processweb.de|*" Project="Debug" />
+    </Project>
+  </Folder>
   <Project Path="../../WebProjectComponents/MT940Parser/MT940Parser/MT940Parser.csproj">
     <BuildType Solution="db-dev.processweb.de|Any CPU" Project="Debug" />
     <BuildType Solution="server02.processweb.de|Any CPU" Project="Debug" />
diff --git a/OCORE b/OCORE
index 3cf8cd1..d760efc 160000
--- a/OCORE
+++ b/OCORE
@@ -1 +1 @@
-Subproject commit 3cf8cd1dd5fb5a3f433c29e436b3e32cae4ac78e
+Subproject commit d760efc077c7a941c7906f1bfab9075dbf0a4c56
diff --git a/eRechnungLib b/eRechnungLib
new file mode 160000
index 0000000..3d37d8b
--- /dev/null
+++ b/eRechnungLib
@@ -0,0 +1 @@
+Subproject commit 3d37d8b08242c29900178a469823715cb14677b0