OPC # 0001: Extract Clarity into standalone repo

Clarity.MigrationService/Clarity.MigrationService.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Worker">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UserSecretsId>dotnet-Clarity.MigrationService-bf435d60-c671-4bd2-bd5a-41edaf989137</UserSecretsId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" />
+    <PackageReference Include="Aspire.Npgsql.EntityFrameworkCore.PostgreSQL" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Clarity.Server\Clarity.Server.csproj" />
+    <ProjectReference Include="..\Clarity.ServiceDefaults\Clarity.ServiceDefaults.csproj" />
+  </ItemGroup>
+</Project>

Clarity.MigrationService/Program.cs

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+using Clarity.MigrationService;
+using Clarity.Server.Data;
+using Microsoft.EntityFrameworkCore;
+
+var builder = Host.CreateApplicationBuilder(args);
+builder.AddServiceDefaults();
+builder.Services.AddHostedService<Worker>();
+
+var connectionString = builder.Configuration.GetConnectionString("postgresdb")
+    ?? throw new InvalidOperationException("Connection string 'postgresdb' not found.");
+
+builder.Services.AddDbContext<ApplicationDbContext>(options =>
+    options.UseNpgsql(connectionString));
+
+var host = builder.Build();
+host.Run();

Clarity.MigrationService/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "Clarity.MigrationService": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Clarity.MigrationService/Worker.cs

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+using Clarity.Server.Data;
+using Microsoft.EntityFrameworkCore;
+using System.Diagnostics;
+
+namespace Clarity.MigrationService;
+
+public class Worker(
+    IServiceProvider serviceProvider,
+    IHostApplicationLifetime hostApplicationLifetime) : BackgroundService
+{
+    public const string ActivitySourceName = "Migrations";
+    private static readonly ActivitySource s_activitySource = new(ActivitySourceName);
+
+    protected override async Task ExecuteAsync(
+        CancellationToken cancellationToken)
+    {
+        using var activity = s_activitySource.StartActivity(
+            "Migrating database", ActivityKind.Client);
+
+        try
+        {
+            using var scope = serviceProvider.CreateScope();
+            var dbContext = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+
+            await RunMigrationAsync(dbContext, cancellationToken);
+        }
+        catch (Exception ex)
+        {
+            activity?.AddException(ex);
+            throw;
+        }
+
+        hostApplicationLifetime.StopApplication();
+    }
+
+    private static async Task RunMigrationAsync(
+        ApplicationDbContext dbContext, CancellationToken cancellationToken)
+    {
+        var strategy = dbContext.Database.CreateExecutionStrategy();
+        await strategy.ExecuteAsync(async () =>
+        {
+            // Run migration in a transaction to avoid partial migration if it fails.
+            await dbContext.Database.MigrateAsync(cancellationToken);
+        });
+    }
+}

Clarity.MigrationService/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

Clarity.MigrationService/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}