Enhance logging and update solution structure

Replaced `DigitalData.MessagingService.Client.DependencyInjection`
with `DigitalData.MessagingService.Client` in the solution file,
updating project references and build configurations.

Improved logging by integrating Serilog's SQLite sink and `Serilog.UI`
for web-based log visualization. Added dynamic log directory
resolution and SQLite-based log storage in `Program.cs`.

Enhanced `DigitalData.MessagingService.API.csproj` with metadata
properties for better documentation and packaging. Added new NuGet
dependencies for logging and removed unused `<Folder>` entries.

Updated `appsettings.json` to include `Application:LogDirectory`
and `Swagger:Enabled` settings for configurable logging and Swagger
availability.

DigitalData.MessagingService.sln

@@ -35,10 +35,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.MessagingServic
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.MessagingService.API", "src\presentation\DigitalData.MessagingService.API\DigitalData.MessagingService.API.csproj", "{8BF22107-3CB9-C326-B94B-C40C99DA9B68}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.MessagingService.Client.DependencyInjection", "src\presentation\DigitalData.MessagingService.Client.DependencyInjection\DigitalData.MessagingService.Client.DependencyInjection.csproj", "{B67C6FA8-DA47-41EC-B15A-511C5B19C036}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.MessagingService.Publisher", "src\infrastructure\DigitalData.MessagingService.Publisher\DigitalData.MessagingService.Publisher.csproj", "{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DigitalData.MessagingService.Client", "src\presentation\DigitalData.MessagingService.Client\DigitalData.MessagingService.Client.csproj", "{770E96B0-C3C9-A9A3-4F98-F7A0295D1599}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -73,14 +73,14 @@ Global
 		{8BF22107-3CB9-C326-B94B-C40C99DA9B68}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8BF22107-3CB9-C326-B94B-C40C99DA9B68}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8BF22107-3CB9-C326-B94B-C40C99DA9B68}.Release|Any CPU.Build.0 = Release|Any CPU
-		{B67C6FA8-DA47-41EC-B15A-511C5B19C036}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{B67C6FA8-DA47-41EC-B15A-511C5B19C036}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{B67C6FA8-DA47-41EC-B15A-511C5B19C036}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{B67C6FA8-DA47-41EC-B15A-511C5B19C036}.Release|Any CPU.Build.0 = Release|Any CPU
 		{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{770E96B0-C3C9-A9A3-4F98-F7A0295D1599}.Debug|Any CPU.ActiveCfg = Release|Any CPU
+		{770E96B0-C3C9-A9A3-4F98-F7A0295D1599}.Debug|Any CPU.Build.0 = Release|Any CPU
+		{770E96B0-C3C9-A9A3-4F98-F7A0295D1599}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{770E96B0-C3C9-A9A3-4F98-F7A0295D1599}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -96,8 +96,8 @@ Global
 		{56607AAB-3DEC-CB78-3062-56A8EEF5E9D2} = {71BEA4D0-7835-4A8C-B11E-1088E0801DCE}
 		{4CF993A6-FA3E-CBF7-C4CB-FFAEBFCFF705} = {71BEA4D0-7835-4A8C-B11E-1088E0801DCE}
 		{8BF22107-3CB9-C326-B94B-C40C99DA9B68} = {B52B4CEE-1C67-424B-8659-370FEA7EAF2A}
-		{B67C6FA8-DA47-41EC-B15A-511C5B19C036} = {B52B4CEE-1C67-424B-8659-370FEA7EAF2A}
 		{8DBBAA7C-C4D3-4ADD-8372-B0D6260C8FFC} = {71BEA4D0-7835-4A8C-B11E-1088E0801DCE}
+		{770E96B0-C3C9-A9A3-4F98-F7A0295D1599} = {B52B4CEE-1C67-424B-8659-370FEA7EAF2A}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {90E29FDC-F6C6-414F-94BF-25DF61D18060}

src/presentation/DigitalData.MessagingService.API/DigitalData.MessagingService.API.csproj

@@ -1,25 +1,35 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFrameworks>net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
-	<UserSecretsId>dotnet-DigitalData.MessagingService.Service-e7ef6a9a-436f-48a1-b4f6-ec9381c8cb47</UserSecretsId>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <PackageId>DigitalData.MessagingService.API</PackageId>
+    <Title></Title>
+    <Authors>Digital Data GmbH</Authors>
+    <Company>Digital Data GmbH</Company>
+    <Product>DigitalData.MessagingService.API</Product>
+    <Version>1.0.0-beta</Version>
+    <FileVersion>1.0.0.0</FileVersion>
+    <AssemblyVersion>1.0.0.0</AssemblyVersion>
+    <Copyright>Copyright © 2026 Digital Data GmbH. All rights reserved.</Copyright>
+	<DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
+    <PackageReference Include="Serilog.Settings.Configuration" Version="10.0.1" />
     <PackageReference Include="Serilog.Sinks.Console" Version="6.1.1" />
     <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
+    <PackageReference Include="Serilog.Sinks.SQLite" Version="7.0.0" />
+    <PackageReference Include="Serilog.UI" Version="3.2.0" />
+    <PackageReference Include="Serilog.UI.SqliteProvider" Version="1.1.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
 	<PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.10" />
 	<PackageReference Include="System.Security.Cryptography.Xml" Version="10.0.10" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="Properties\" />
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\core\DigitalData.MessagingService.Application\DigitalData.MessagingService.Application.csproj" />
     <ProjectReference Include="..\..\core\DigitalData.MessagingService.Domain\DigitalData.MessagingService.Domain.csproj" />

src/presentation/DigitalData.MessagingService.API/Program.cs

@@ -3,15 +3,40 @@ using DigitalData.MessagingService.Application;
 using DigitalData.MessagingService.Application.Common.Dtos;
 using DigitalData.MessagingService.Infrastructure;
 using Serilog;
+using Serilog.Ui.Core.Extensions;
+using Serilog.Ui.SqliteDataProvider.Extensions;
+using Serilog.Ui.Web.Extensions;
 
-// Configure Serilog early
+// Build temporary configuration to read log directory early
+var tempConfig = new ConfigurationBuilder()
+    .SetBasePath(Directory.GetCurrentDirectory())
+    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: false)
+    .AddJsonFile("appsettings.Secrets.json", optional: true, reloadOnChange: false)
+    .Build();
+
+var logDirectoryRaw = tempConfig.GetValue<string>("Application:LogDirectory") ?? "logs";
+// Always resolve to an absolute path so sink and UI provider point to the same file
+var logDirectory = Path.IsPathRooted(logDirectoryRaw)
+    ? logDirectoryRaw
+    : Path.Combine(AppContext.BaseDirectory, logDirectoryRaw);
+Directory.CreateDirectory(logDirectory);
+var sqliteDbPath = Path.Combine(logDirectory, "logs.db");
+
+// Configure Serilog early (bootstrap + full pipeline)
 Log.Logger = new LoggerConfiguration()
-    .WriteTo.Console()
+    .MinimumLevel.Information()
+    .MinimumLevel.Override("Microsoft", Serilog.Events.LogEventLevel.Warning)
+    .MinimumLevel.Override("Microsoft.AspNetCore", Serilog.Events.LogEventLevel.Warning)
+    .MinimumLevel.Override("Microsoft.EntityFrameworkCore", Serilog.Events.LogEventLevel.Warning)
+    .MinimumLevel.Override("System", Serilog.Events.LogEventLevel.Warning)
+    .Enrich.FromLogContext()
+    .WriteTo.Console(outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}")
     .WriteTo.File(
-        path: "logs/emailprofiler-.log",
+        path: Path.Combine(logDirectory, "emailprofiler-.log"),
         rollingInterval: RollingInterval.Day,
         retainedFileCountLimit: 30,
         outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}")
+    .WriteTo.SQLite(sqliteDbPath, storeTimestampInUtc: true)
     .CreateBootstrapLogger();
 
 try
@@ -25,12 +50,13 @@ try
         .ReadFrom.Configuration(context.Configuration)
         .ReadFrom.Services(services)
         .Enrich.FromLogContext()
-        .WriteTo.Console()
+        .WriteTo.Console(outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}")
         .WriteTo.File(
-            path: "logs/emailprofiler-.log",
+            path: Path.Combine(logDirectory, "emailprofiler-.log"),
             rollingInterval: RollingInterval.Day,
             retainedFileCountLimit: 30,
-            outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}"));
+            outputTemplate: "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}")
+        .WriteTo.SQLite(sqliteDbPath, storeTimestampInUtc: true));
 
     // Add appsettings.Secrets.json for sensitive configuration (not committed to git)
     builder.Configuration.AddJsonFile("appsettings.Secrets.json", optional: true, reloadOnChange: true);
@@ -50,6 +76,16 @@ try
     builder.Services.AddEndpointsApiExplorer();
     builder.Services.AddSwaggerGen();
 
+    // Register Serilog.UI with SQLite provider for web log viewer
+    builder.Services.AddSerilogUi(options =>
+    {
+        options.UseSqliteServer(dbOpt =>
+        {
+            dbOpt.WithConnectionString($"Data Source={sqliteDbPath}");
+            dbOpt.WithTable("Logs");
+        });
+    });
+
     var app = builder.Build();
 
     // Add global exception handling middleware
@@ -58,8 +94,11 @@ try
     // Add Serilog request logging
     app.UseSerilogRequestLogging();
 
-    // Configure the HTTP request pipeline.
+    // Configure Swagger — enabled in Development always, and in other environments based on appsettings
-    if (app.Environment.IsDevelopment())
+    var swaggerEnabled = app.Environment.IsDevelopment()
+        || app.Configuration.GetValue<bool>("Swagger:Enabled");
+
+    if (swaggerEnabled)
     {
         app.UseSwagger();
         app.UseSwaggerUI();
@@ -67,6 +106,9 @@ try
 
     app.UseHttpsRedirection();
 
+    // Serve Serilog.UI log viewer at /serilog-ui
+    app.UseSerilogUi();
+
     app.UseAuthorization();
 
     app.MapControllers();

src/presentation/DigitalData.MessagingService.API/appsettings.json

@@ -11,6 +11,12 @@
     }
   },
   "AllowedHosts": "*",
+  "Application": {
+    "LogDirectory": "logs"
+  },
+  "Swagger": {
+    "Enabled": true
+  },
   "Workers": {
     "EmailSender": {
       "Enabled": true