[FA-misc] Initial MassTransit implementation seems to work

Reviewed-on: #61

.gitea/workflows/build-gateway.yml

@@ -28,6 +28,9 @@ jobs:
           - name: user-service
             project: FictionArchive.Service.UserService
             subgraph: User
+          - name: usernoveldata-service
+            project: FictionArchive.Service.UserNovelDataService
+            subgraph: UserNovelData
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -110,6 +113,12 @@ jobs:
           name: user-service-subgraph
           path: subgraphs/user
 
+      - name: Download UserNovelData Service subgraph
+        uses: christopherhx/gitea-download-artifact@v4
+        with:
+          name: usernoveldata-service-subgraph
+          path: subgraphs/usernoveldata
+
       - name: Configure subgraph URLs for Docker
         run: |
           for fsp in subgraphs/*/*.fsp; do

.gitea/workflows/release.yml

@@ -27,6 +27,8 @@ jobs:
             dockerfile: FictionArchive.Service.SchedulerService/Dockerfile
           - name: authentication-service
             dockerfile: FictionArchive.Service.AuthenticationService/Dockerfile
+          - name: usernoveldata-service
+            dockerfile: FictionArchive.Service.UserNovelDataService/Dockerfile
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.gitignore

@@ -140,3 +140,6 @@ appsettings.Local.json
 schema.graphql
 *.fsp
 gateway.fgp
+
+# Git worktrees
+.worktrees/

FictionArchive.Service.AuthenticationService/Controllers/AuthenticationWebhookController.cs

@@ -1,36 +0,0 @@
-using FictionArchive.Service.AuthenticationService.Models.Requests;
-using FictionArchive.Service.AuthenticationService.Models.IntegrationEvents;
-using FictionArchive.Service.Shared.Services.EventBus;
-using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc;
-
-namespace FictionArchive.Service.AuthenticationService.Controllers
-{
-    [Route("api/[controller]")]
-    [ApiController]
-    public class AuthenticationWebhookController : ControllerBase
-    {
-        private readonly IEventBus _eventBus;
-
-        public AuthenticationWebhookController(IEventBus eventBus)
-        {
-            _eventBus = eventBus;
-        }
-
-        [HttpPost(nameof(UserRegistered))]
-        public async Task<ActionResult> UserRegistered([FromBody] UserRegisteredWebhookPayload payload)
-        {
-            var authUserAddedEvent = new AuthUserAddedEvent
-            {
-                OAuthProviderId = payload.OAuthProviderId,
-                InviterOAuthProviderId = payload.InviterOAuthProviderId,
-                EventUserEmail = payload.EventUserEmail,
-                EventUserUsername = payload.EventUserUsername
-            };
-
-            await _eventBus.Publish(authUserAddedEvent);
-
-            return Ok();
-        }
-    }
-}

FictionArchive.Service.AuthenticationService/Dockerfile

@@ -1,23 +0,0 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
-USER $APP_UID
-WORKDIR /app
-EXPOSE 8080
-EXPOSE 8081
-
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
-ARG BUILD_CONFIGURATION=Release
-WORKDIR /src
-COPY ["FictionArchive.Service.AuthenticationService/FictionArchive.Service.AuthenticationService.csproj", "FictionArchive.Service.AuthenticationService/"]
-RUN dotnet restore "FictionArchive.Service.AuthenticationService/FictionArchive.Service.AuthenticationService.csproj"
-COPY . .
-WORKDIR "/src/FictionArchive.Service.AuthenticationService"
-RUN dotnet build "./FictionArchive.Service.AuthenticationService.csproj" -c $BUILD_CONFIGURATION -o /app/build
-
-FROM build AS publish
-ARG BUILD_CONFIGURATION=Release
-RUN dotnet publish "./FictionArchive.Service.AuthenticationService.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
-
-FROM base AS final
-WORKDIR /app
-COPY --from=publish /app/publish .
-ENTRYPOINT ["dotnet", "FictionArchive.Service.AuthenticationService.dll"]

FictionArchive.Service.AuthenticationService/FictionArchive.Service.AuthenticationService.csproj

@@ -1,29 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
-
-    <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
-        <Nullable>enable</Nullable>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
-    </PropertyGroup>
-
-    <ItemGroup>
-        <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="8.0.7" />
-        <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2"/>
-    </ItemGroup>
-
-    <ItemGroup>
-      <Content Include="..\.dockerignore">
-        <Link>.dockerignore</Link>
-      </Content>
-    </ItemGroup>
-
-    <ItemGroup>
-      <ProjectReference Include="..\FictionArchive.Service.Shared\FictionArchive.Service.Shared.csproj" />
-    </ItemGroup>
-
-    <ItemGroup>
-      <Folder Include="Controllers\" />
-    </ItemGroup>
-
-</Project>

FictionArchive.Service.AuthenticationService/FictionArchive.Service.AuthenticationService.http

@@ -1,6 +0,0 @@
-@FictionArchive.Service.AuthenticationService_HostAddress = http://localhost:5091
-
-GET {{FictionArchive.Service.AuthenticationService_HostAddress}}/weatherforecast/
-Accept: application/json
-
-###

FictionArchive.Service.AuthenticationService/Models/IntegrationEvents/AuthUserAddedEvent.cs

@@ -1,16 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.AuthenticationService.Models.IntegrationEvents;
-
-public class AuthUserAddedEvent : IIntegrationEvent
-{
-    public string OAuthProviderId { get; set; }
-    
-    public string InviterOAuthProviderId { get; set; }
-
-    // The email of the user that created the event
-    public string EventUserEmail { get; set; }
-
-    // The username of the user that created the event
-    public string EventUserUsername { get; set; }
-}

FictionArchive.Service.AuthenticationService/Models/Requests/UserRegisteredWebhookPayload.cs

@@ -1,17 +0,0 @@
-namespace FictionArchive.Service.AuthenticationService.Models.Requests;
-
-public class UserRegisteredWebhookPayload
-{
-    // The body of the notification message
-    public string Body { get; set; }
-    
-    public string OAuthProviderId { get; set; }
-    
-    public string InviterOAuthProviderId { get; set; }
-
-    // The email of the user that created the event
-    public string EventUserEmail { get; set; }
-
-    // The username of the user that created the event
-    public string EventUserUsername { get; set; }
-}

FictionArchive.Service.AuthenticationService/Program.cs

@@ -1,49 +0,0 @@
-using FictionArchive.Service.Shared;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
-
-namespace FictionArchive.Service.AuthenticationService;
-
-public class Program
-{
-    public static void Main(string[] args)
-    {
-        var builder = WebApplication.CreateBuilder(args);
-
-        // Add services to the container.
-
-        builder.Services.AddControllers();
-        // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
-        builder.Services.AddEndpointsApiExplorer();
-        builder.Services.AddSwaggerGen();
-
-        #region Event Bus
-
-        builder.Services.AddRabbitMQ(opt =>
-        {
-            builder.Configuration.GetSection("RabbitMQ").Bind(opt);
-        });
-        
-        #endregion
-
-        builder.Services.AddHealthChecks();
-        
-        var app = builder.Build();
-
-        // Configure the HTTP request pipeline.
-        if (app.Environment.IsDevelopment())
-        {
-            app.UseSwagger();
-            app.UseSwaggerUI();
-        }
-
-        app.UseHttpsRedirection();
-
-        app.MapHealthChecks("/healthz");
-        
-        app.UseAuthorization();
-        
-        app.MapControllers();
-
-        app.Run();
-    }
-}

FictionArchive.Service.AuthenticationService/Properties/launchSettings.json

@@ -1,41 +0,0 @@
-{
-  "$schema": "http://json.schemastore.org/launchsettings.json",
-  "iisSettings": {
-    "windowsAuthentication": false,
-    "anonymousAuthentication": true,
-    "iisExpress": {
-      "applicationUrl": "http://localhost:23522",
-      "sslPort": 44397
-    }
-  },
-  "profiles": {
-    "http": {
-      "commandName": "Project",
-      "dotnetRunMessages": true,
-      "launchBrowser": true,
-      "launchUrl": "swagger",
-      "applicationUrl": "http://localhost:5091",
-      "environmentVariables": {
-        "ASPNETCORE_ENVIRONMENT": "Development"
-      }
-    },
-    "https": {
-      "commandName": "Project",
-      "dotnetRunMessages": true,
-      "launchBrowser": true,
-      "launchUrl": "swagger",
-      "applicationUrl": "https://localhost:7223;http://localhost:5091",
-      "environmentVariables": {
-        "ASPNETCORE_ENVIRONMENT": "Development"
-      }
-    },
-    "IIS Express": {
-      "commandName": "IISExpress",
-      "launchBrowser": true,
-      "launchUrl": "swagger",
-      "environmentVariables": {
-        "ASPNETCORE_ENVIRONMENT": "Development"
-      }
-    }
-  }
-}

FictionArchive.Service.AuthenticationService/appsettings.Development.json

@@ -1,8 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  }
-}

FictionArchive.Service.AuthenticationService/appsettings.json

@@ -1,13 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  },
-  "RabbitMQ": {
-    "ConnectionString": "amqp://localhost",
-    "ClientIdentifier": "AuthenticationService"
-  },
-  "AllowedHosts": "*"
-}

FictionArchive.Service.FileService/Consumers/FileUploadRequestCreatedConsumer.cs

@@ -0,0 +1,74 @@
+using Amazon.S3;
+using Amazon.S3.Model;
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.FileService.Contracts;
+using FictionArchive.Service.FileService.Models;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace FictionArchive.Service.FileService.Consumers;
+
+public class FileUploadRequestCreatedConsumer : IConsumer<IFileUploadRequestCreated>
+{
+    private readonly ILogger<FileUploadRequestCreatedConsumer> _logger;
+    private readonly AmazonS3Client _amazonS3Client;
+    private readonly IPublishEndpoint _publishEndpoint;
+    private readonly S3Configuration _s3Configuration;
+    private readonly ProxyConfiguration _proxyConfiguration;
+
+    public FileUploadRequestCreatedConsumer(
+        ILogger<FileUploadRequestCreatedConsumer> logger,
+        AmazonS3Client amazonS3Client,
+        IPublishEndpoint publishEndpoint,
+        IOptions<S3Configuration> s3Configuration,
+        IOptions<ProxyConfiguration> proxyConfiguration)
+    {
+        _logger = logger;
+        _amazonS3Client = amazonS3Client;
+        _publishEndpoint = publishEndpoint;
+        _s3Configuration = s3Configuration.Value;
+        _proxyConfiguration = proxyConfiguration.Value;
+    }
+
+    public async Task Consume(ConsumeContext<IFileUploadRequestCreated> context)
+    {
+        var message = context.Message;
+
+        var putObjectRequest = new PutObjectRequest
+        {
+            BucketName = _s3Configuration.Bucket,
+            Key = message.FilePath
+        };
+
+        using var memoryStream = new MemoryStream(message.FileData);
+        putObjectRequest.InputStream = memoryStream;
+
+        var s3Response = await _amazonS3Client.PutObjectAsync(putObjectRequest);
+
+        if (s3Response.HttpStatusCode != System.Net.HttpStatusCode.OK)
+        {
+            _logger.LogError("Failed to upload file {FilePath} to S3", message.FilePath);
+
+            await _publishEndpoint.Publish<IFileUploadRequestStatusUpdate>(
+                new FileUploadRequestStatusUpdate(
+                    RequestId: message.RequestId,
+                    Status: RequestStatus.Failed,
+                    FileAccessUrl: null,
+                    ErrorMessage: "An error occurred while uploading file to S3."));
+            return;
+        }
+
+        var fileAccessUrl = _proxyConfiguration.BaseUrl + "/" + message.FilePath;
+
+        _logger.LogInformation("Successfully uploaded file {FilePath} to S3", message.FilePath);
+
+        await _publishEndpoint.Publish<IFileUploadRequestStatusUpdate>(
+            new FileUploadRequestStatusUpdate(
+                RequestId: message.RequestId,
+                Status: RequestStatus.Success,
+                FileAccessUrl: fileAccessUrl,
+                ErrorMessage: null));
+    }
+}

FictionArchive.Service.FileService/Contracts/FileUploadRequestStatusUpdate.cs

@@ -0,0 +1,10 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.FileService.Contracts;
+
+public record FileUploadRequestStatusUpdate(
+    Guid RequestId,
+    RequestStatus Status,
+    string? FileAccessUrl,
+    string? ErrorMessage) : IFileUploadRequestStatusUpdate;

FictionArchive.Service.FileService/Models/IntegrationEvents/FileUploadRequestCreatedEvent.cs

@@ -1,10 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.FileService.Models.IntegrationEvents;
-
-public class FileUploadRequestCreatedEvent : IIntegrationEvent
-{
-    public Guid RequestId { get; set; }
-    public string FilePath { get; set; }
-    public byte[] FileData { get; set; }
-}

FictionArchive.Service.FileService/Models/IntegrationEvents/FileUploadRequestStatusUpdateEvent.cs

@@ -1,22 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.FileService.Models.IntegrationEvents;
-
-public class FileUploadRequestStatusUpdateEvent : IIntegrationEvent
-{
-    public Guid RequestId { get; set; }
-    public RequestStatus Status { get; set; }
-    
-    #region Success
-    
-    public string? FileAccessUrl { get; set; }
-    
-    #endregion
-    
-    #region Failure
-    
-    public string? ErrorMessage { get; set; }
-    
-    #endregion
-}

FictionArchive.Service.FileService/Program.cs

@@ -1,11 +1,9 @@
 using Amazon.Runtime;
 using Amazon.S3;
 using FictionArchive.Common.Extensions;
+using FictionArchive.Service.FileService.Consumers;
 using FictionArchive.Service.FileService.Models;
-using FictionArchive.Service.FileService.Models.IntegrationEvents;
-using FictionArchive.Service.FileService.Services.EventHandlers;
 using FictionArchive.Service.Shared.Extensions;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using Microsoft.Extensions.Options;
 
 namespace FictionArchive.Service.FileService;
@@ -24,13 +22,14 @@ public class Program
 
         builder.Services.AddHealthChecks();
         
-        #region Event Bus
+        #region MassTransit
 
-        builder.Services.AddRabbitMQ(opt =>
-        {
-            builder.Configuration.GetSection("RabbitMQ").Bind(opt);
-        })
-        .Subscribe<FileUploadRequestCreatedEvent, FileUploadRequestCreatedEventHandler>();
+        builder.Services.AddFictionArchiveMassTransit(
+            builder.Configuration,
+            x =>
+            {
+                x.AddConsumer<FileUploadRequestCreatedConsumer>();
+            });
 
         #endregion
         

FictionArchive.Service.FileService/Services/EventHandlers/FileUploadRequestCreatedEventHandler.cs

@@ -1,58 +0,0 @@
-using Amazon.S3;
-using Amazon.S3.Model;
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.FileService.Models;
-using FictionArchive.Service.FileService.Models.IntegrationEvents;
-using FictionArchive.Service.Shared.Services.EventBus;
-using Microsoft.Extensions.Options;
-
-namespace FictionArchive.Service.FileService.Services.EventHandlers;
-
-public class FileUploadRequestCreatedEventHandler : IIntegrationEventHandler<FileUploadRequestCreatedEvent>
-{
-    private readonly ILogger<FileUploadRequestCreatedEventHandler> _logger;
-    private readonly AmazonS3Client _amazonS3Client;
-    private readonly IEventBus _eventBus;
-    private readonly S3Configuration _s3Configuration;
-    private readonly ProxyConfiguration _proxyConfiguration;
-
-    public FileUploadRequestCreatedEventHandler(ILogger<FileUploadRequestCreatedEventHandler> logger, AmazonS3Client amazonS3Client, IEventBus eventBus, IOptions<S3Configuration> s3Configuration, IOptions<ProxyConfiguration> proxyConfiguration)
-    {
-        _logger = logger;
-        _amazonS3Client = amazonS3Client;
-        _eventBus = eventBus;
-        _proxyConfiguration = proxyConfiguration.Value;
-        _s3Configuration = s3Configuration.Value;
-    }
-
-    public async Task Handle(FileUploadRequestCreatedEvent @event)
-    {
-        var putObjectRequest = new PutObjectRequest();
-        putObjectRequest.BucketName = _s3Configuration.Bucket;
-        putObjectRequest.Key = @event.FilePath;
-        putObjectRequest.UseChunkEncoding = false; // Needed to avoid an error with Garage
-        
-        using MemoryStream memoryStream = new MemoryStream(@event.FileData);
-        putObjectRequest.InputStream = memoryStream;
-
-        var s3Response = await _amazonS3Client.PutObjectAsync(putObjectRequest);
-        if (s3Response.HttpStatusCode != System.Net.HttpStatusCode.OK)
-        {
-            _logger.LogError("An error occurred while uploading file to S3. Response code: {responsecode}", s3Response.HttpStatusCode);
-            await _eventBus.Publish(new FileUploadRequestStatusUpdateEvent()
-            {
-                RequestId = @event.RequestId,
-                Status = RequestStatus.Failed,
-                ErrorMessage = "An error occurred while uploading file to S3."
-            });
-            return;
-        }
-
-        await _eventBus.Publish(new FileUploadRequestStatusUpdateEvent()
-        {
-            Status = RequestStatus.Success,
-            RequestId = @event.RequestId,
-            FileAccessUrl = _proxyConfiguration.BaseUrl + "/" + @event.FilePath
-        });
-    }
-}

FictionArchive.Service.FileService/appsettings.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
     }
   },
   "ProxyConfiguration": {

FictionArchive.Service.NovelService.Tests/NovelUpdateServiceTests.cs

@@ -1,5 +1,4 @@
 using FictionArchive.Common.Enums;
-using FictionArchive.Service.FileService.IntegrationEvents;
 using FictionArchive.Service.NovelService.Models.Configuration;
 using FictionArchive.Service.NovelService.Models.Enums;
 using FictionArchive.Service.NovelService.Models.Images;
@@ -8,9 +7,10 @@ using FictionArchive.Service.NovelService.Models.Novels;
 using FictionArchive.Service.NovelService.Models.SourceAdapters;
 using FictionArchive.Service.NovelService.Services;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
-using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.Shared.Contracts.Events;
 using FluentAssertions;
 using HtmlAgilityPack;
+using MassTransit;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
@@ -42,6 +42,13 @@ public class NovelUpdateServiceTests
             Images = new List<Image>()
         };
 
+        var volume = new Volume
+        {
+            Order = 1,
+            Name = LocalizationKey.CreateFromText("Main Story", Language.En),
+            Chapters = new List<Chapter> { chapter }
+        };
+
         var novel = new Novel
         {
             Url = "http://demo/novel",
@@ -52,20 +59,20 @@ public class NovelUpdateServiceTests
             Source = source,
             Name = LocalizationKey.CreateFromText("Demo Novel", Language.En),
             Description = LocalizationKey.CreateFromText("Description", Language.En),
-            Chapters = new List<Chapter> { chapter },
+            Volumes = new List<Volume> { volume },
             Tags = new List<NovelTag>()
         };
 
         dbContext.Novels.Add(novel);
         dbContext.SaveChanges();
 
-        return new NovelCreateResult(novel, chapter);
+        return new NovelCreateResult(novel, volume, chapter);
     }
 
     private static NovelUpdateService CreateService(
         NovelServiceDbContext dbContext,
         ISourceAdapter adapter,
-        IEventBus eventBus,
+        IPublishEndpoint publishEndpoint,
         string pendingImageUrl = "https://pending/placeholder.jpg")
     {
         var options = Options.Create(new NovelUpdateServiceConfiguration
@@ -73,7 +80,7 @@ public class NovelUpdateServiceTests
             PendingImageUrl = pendingImageUrl
         });
 
-        return new NovelUpdateService(dbContext, NullLogger<NovelUpdateService>.Instance, new[] { adapter }, eventBus, options);
+        return new NovelUpdateService(dbContext, NullLogger<NovelUpdateService>.Instance, new[] { adapter }, publishEndpoint, options);
     }
 
     [Fact]
@@ -81,7 +88,7 @@ public class NovelUpdateServiceTests
     {
         using var dbContext = CreateDbContext();
         var source = new Source { Name = "Demo", Key = "demo", Url = "http://demo" };
-        var (novel, chapter) = CreateNovelWithSingleChapter(dbContext, source);
+        var (novel, volume, chapter) = CreateNovelWithSingleChapter(dbContext, source);
 
         var rawHtml = "<p>Hello</p><img src=\"http://img/x1.jpg\" alt=\"first\" /><img src=\"http://img/x2.jpg\" alt=\"second\" />";
         var image1 = new ImageData { Url = "http://img/x1.jpg", Data = new byte[] { 1, 2, 3 } };
@@ -95,15 +102,15 @@ public class NovelUpdateServiceTests
             ImageData = new List<ImageData> { image1, image2 }
         }));
 
-        var publishedEvents = new List<FileUploadRequestCreatedEvent>();
-        var eventBus = Substitute.For<IEventBus>();
-        eventBus.Publish(Arg.Do<FileUploadRequestCreatedEvent>(publishedEvents.Add)).Returns(Task.CompletedTask);
-        eventBus.Publish(Arg.Any<object>(), Arg.Any<string>()).Returns(Task.CompletedTask);
+        var publishedEvents = new List<IFileUploadRequestCreated>();
+        var publishEndpoint = Substitute.For<IPublishEndpoint>();
+        publishEndpoint.Publish(Arg.Do<IFileUploadRequestCreated>(e => publishedEvents.Add(e)), Arg.Any<CancellationToken>())
+            .Returns(Task.CompletedTask);
 
         var pendingImageUrl = "https://pending/placeholder.jpg";
-        var service = CreateService(dbContext, adapter, eventBus, pendingImageUrl);
+        var service = CreateService(dbContext, adapter, publishEndpoint, pendingImageUrl);
 
-        var updatedChapter = await service.PullChapterContents(novel.Id, chapter.Order);
+        var updatedChapter = await service.PullChapterContents(novel.Id, volume.Id, chapter.Order);
 
         updatedChapter.Images.Should().HaveCount(2);
         updatedChapter.Images.Select(i => i.OriginalPath).Should().BeEquivalentTo(new[] { image1.Url, image2.Url });
@@ -131,7 +138,7 @@ public class NovelUpdateServiceTests
     {
         using var dbContext = CreateDbContext();
         var source = new Source { Name = "Demo", Key = "demo", Url = "http://demo" };
-        var (novel, chapter) = CreateNovelWithSingleChapter(dbContext, source);
+        var (novel, volume, chapter) = CreateNovelWithSingleChapter(dbContext, source);
 
         var rawHtml = "<p>Hi</p><img src=\"http://img/x1.jpg\">";
         var image = new ImageData { Url = "http://img/x1.jpg", Data = new byte[] { 7, 8, 9 } };
@@ -144,13 +151,11 @@ public class NovelUpdateServiceTests
             ImageData = new List<ImageData> { image }
         }));
 
-        var eventBus = Substitute.For<IEventBus>();
-        eventBus.Publish(Arg.Any<FileUploadRequestCreatedEvent>()).Returns(Task.CompletedTask);
-        eventBus.Publish(Arg.Any<object>(), Arg.Any<string>()).Returns(Task.CompletedTask);
+        var publishEndpoint = Substitute.For<IPublishEndpoint>();
 
-        var service = CreateService(dbContext, adapter, eventBus);
+        var service = CreateService(dbContext, adapter, publishEndpoint);
 
-        var updatedChapter = await service.PullChapterContents(novel.Id, chapter.Order);
+        var updatedChapter = await service.PullChapterContents(novel.Id, volume.Id, chapter.Order);
 
         var storedHtml = updatedChapter.Body.Texts.Single().Text;
         var doc = new HtmlDocument();
@@ -161,7 +166,7 @@ public class NovelUpdateServiceTests
         imgNode.GetAttributeValue("src", string.Empty).Should().Be("https://pending/placeholder.jpg");
     }
 
-    private record NovelCreateResult(Novel Novel, Chapter Chapter);
+    private record NovelCreateResult(Novel Novel, Volume Volume, Chapter Chapter);
 
     #region UpdateImage Tests
 
@@ -179,8 +184,8 @@ public class NovelUpdateServiceTests
         await dbContext.SaveChangesAsync();
 
         var adapter = Substitute.For<ISourceAdapter>();
-        var eventBus = Substitute.For<IEventBus>();
-        var service = CreateService(dbContext, adapter, eventBus);
+        var publishEndpoint = Substitute.For<IPublishEndpoint>();
+        var service = CreateService(dbContext, adapter, publishEndpoint);
 
         var newUrl = "https://cdn.example.com/uploaded/cover.jpg";
 
@@ -199,7 +204,7 @@ public class NovelUpdateServiceTests
         // Arrange
         using var dbContext = CreateDbContext();
         var source = new Source { Name = "Demo", Key = "demo", Url = "http://demo" };
-        var (novel, chapter) = CreateNovelWithSingleChapter(dbContext, source);
+        var (novel, _, chapter) = CreateNovelWithSingleChapter(dbContext, source);
 
         var image = new Image
         {
@@ -221,8 +226,8 @@ public class NovelUpdateServiceTests
         await dbContext.SaveChangesAsync();
 
         var adapter = Substitute.For<ISourceAdapter>();
-        var eventBus = Substitute.For<IEventBus>();
-        var service = CreateService(dbContext, adapter, eventBus, pendingUrl);
+        var publishEndpoint = Substitute.For<IPublishEndpoint>();
+        var service = CreateService(dbContext, adapter, publishEndpoint, pendingUrl);
 
         var newUrl = "https://cdn.example.com/uploaded/image.jpg";
 
@@ -252,7 +257,7 @@ public class NovelUpdateServiceTests
         // Arrange
         using var dbContext = CreateDbContext();
         var source = new Source { Name = "Demo", Key = "demo", Url = "http://demo" };
-        var (novel, chapter) = CreateNovelWithSingleChapter(dbContext, source);
+        var (_, _, chapter) = CreateNovelWithSingleChapter(dbContext, source);
 
         var image1 = new Image { OriginalPath = "http://original/img1.jpg", Chapter = chapter };
         var image2 = new Image { OriginalPath = "http://original/img2.jpg", Chapter = chapter };
@@ -270,8 +275,8 @@ public class NovelUpdateServiceTests
         await dbContext.SaveChangesAsync();
 
         var adapter = Substitute.For<ISourceAdapter>();
-        var eventBus = Substitute.For<IEventBus>();
-        var service = CreateService(dbContext, adapter, eventBus, pendingUrl);
+        var publishEndpoint = Substitute.For<IPublishEndpoint>();
+        var service = CreateService(dbContext, adapter, publishEndpoint, pendingUrl);
 
         var newUrl = "https://cdn.example.com/uploaded/img1.jpg";
 

FictionArchive.Service.NovelService/Consumers/ChapterPullRequestedConsumer.cs

@@ -0,0 +1,26 @@
+using FictionArchive.Service.NovelService.Services;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.NovelService.Consumers;
+
+public class ChapterPullRequestedConsumer : IConsumer<IChapterPullRequested>
+{
+    private readonly ILogger<ChapterPullRequestedConsumer> _logger;
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public ChapterPullRequestedConsumer(
+        ILogger<ChapterPullRequestedConsumer> logger,
+        NovelUpdateService novelUpdateService)
+    {
+        _logger = logger;
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Consume(ConsumeContext<IChapterPullRequested> context)
+    {
+        var message = context.Message;
+        await _novelUpdateService.PullChapterContents(message.NovelId, message.VolumeId, message.ChapterOrder);
+    }
+}

FictionArchive.Service.NovelService/Consumers/FileUploadRequestStatusUpdateConsumer.cs

@@ -0,0 +1,47 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.NovelService.Services;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.NovelService.Consumers;
+
+public class FileUploadRequestStatusUpdateConsumer : IConsumer<IFileUploadRequestStatusUpdate>
+{
+    private readonly ILogger<FileUploadRequestStatusUpdateConsumer> _logger;
+    private readonly NovelServiceDbContext _dbContext;
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public FileUploadRequestStatusUpdateConsumer(
+        ILogger<FileUploadRequestStatusUpdateConsumer> logger,
+        NovelServiceDbContext dbContext,
+        NovelUpdateService novelUpdateService)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Consume(ConsumeContext<IFileUploadRequestStatusUpdate> context)
+    {
+        var message = context.Message;
+
+        var image = await _dbContext.Images.FindAsync(message.RequestId);
+        if (image == null)
+        {
+            // Not a request we care about.
+            return;
+        }
+
+        if (message.Status == RequestStatus.Failed)
+        {
+            _logger.LogError("Image upload failed for image with id {imageId}", image.Id);
+            return;
+        }
+        else if (message.Status == RequestStatus.Success)
+        {
+            _logger.LogInformation("Image upload succeeded for image with id {imageId}", image.Id);
+            await _novelUpdateService.UpdateImage(image.Id, message.FileAccessUrl);
+        }
+    }
+}

FictionArchive.Service.NovelService/Consumers/NovelUpdateRequestedConsumer.cs

@@ -0,0 +1,26 @@
+using FictionArchive.Service.NovelService.Services;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.NovelService.Consumers;
+
+public class NovelUpdateRequestedConsumer : IConsumer<INovelUpdateRequested>
+{
+    private readonly ILogger<NovelUpdateRequestedConsumer> _logger;
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public NovelUpdateRequestedConsumer(
+        ILogger<NovelUpdateRequestedConsumer> logger,
+        NovelUpdateService novelUpdateService)
+    {
+        _logger = logger;
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Consume(ConsumeContext<INovelUpdateRequested> context)
+    {
+        var message = context.Message;
+        await _novelUpdateService.ImportNovel(message.NovelUrl);
+    }
+}

FictionArchive.Service.NovelService/Consumers/TranslationRequestCompletedConsumer.cs

@@ -0,0 +1,48 @@
+using FictionArchive.Service.NovelService.Models.Localization;
+using FictionArchive.Service.NovelService.Services;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.NovelService.Consumers;
+
+public class TranslationRequestCompletedConsumer : IConsumer<ITranslationRequestCompleted>
+{
+    private readonly ILogger<TranslationRequestCompletedConsumer> _logger;
+    private readonly NovelServiceDbContext _dbContext;
+
+    public TranslationRequestCompletedConsumer(
+        ILogger<TranslationRequestCompletedConsumer> logger,
+        NovelServiceDbContext dbContext)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    public async Task Consume(ConsumeContext<ITranslationRequestCompleted> context)
+    {
+        var message = context.Message;
+
+        var localizationRequest = await _dbContext.LocalizationRequests
+            .Include(r => r.KeyRequestedForTranslation)
+            .ThenInclude(lk => lk.Texts)
+            .FirstOrDefaultAsync(lk => lk.Id == message.TranslationRequestId);
+
+        if (localizationRequest == null)
+        {
+            // Not one of our requests, discard it
+            return;
+        }
+
+        localizationRequest.KeyRequestedForTranslation.Texts.Add(new LocalizationText
+        {
+            Language = localizationRequest.TranslateTo,
+            Text = message.TranslatedText,
+            TranslationEngine = localizationRequest.Engine
+        });
+
+        _dbContext.LocalizationRequests.Remove(localizationRequest);
+        await _dbContext.SaveChangesAsync();
+    }
+}

FictionArchive.Service.NovelService/Contracts/ChapterCreated.cs

@@ -0,0 +1,11 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record ChapterCreated(
+    uint ChapterId,
+    uint NovelId,
+    uint VolumeId,
+    uint VolumeOrder,
+    uint ChapterOrder,
+    string ChapterTitle) : IChapterCreated;

FictionArchive.Service.NovelService/Contracts/ChapterPullRequested.cs

@@ -0,0 +1,8 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record ChapterPullRequested(
+    uint NovelId,
+    uint VolumeId,
+    uint ChapterOrder) : IChapterPullRequested;

FictionArchive.Service.NovelService/Contracts/FileUploadRequestCreated.cs

@@ -0,0 +1,8 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record FileUploadRequestCreated(
+    Guid RequestId,
+    string FilePath,
+    byte[] FileData) : IFileUploadRequestCreated;

FictionArchive.Service.NovelService/Contracts/NovelCreated.cs

@@ -0,0 +1,11 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record NovelCreated(
+    uint NovelId,
+    string Title,
+    Language OriginalLanguage,
+    string Source,
+    string AuthorName) : INovelCreated;

FictionArchive.Service.NovelService/Contracts/NovelUpdateRequested.cs

@@ -0,0 +1,6 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record NovelUpdateRequested(
+    string NovelUrl) : INovelUpdateRequested;

FictionArchive.Service.NovelService/Contracts/TranslationRequestCreated.cs

@@ -0,0 +1,11 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.NovelService.Contracts;
+
+public record TranslationRequestCreated(
+    Guid TranslationRequestId,
+    Language From,
+    Language To,
+    string Body,
+    string TranslationEngineKey) : ITranslationRequestCreated;

FictionArchive.Service.NovelService/GraphQL/Mutation.cs

@@ -1,11 +1,10 @@
+using FictionArchive.Service.NovelService.Contracts;
 using FictionArchive.Service.NovelService.Models.Enums;
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
 using FictionArchive.Service.NovelService.Models.Localization;
 using FictionArchive.Service.NovelService.Models.Novels;
 using FictionArchive.Service.NovelService.Models.SourceAdapters;
 using FictionArchive.Service.NovelService.Services;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
-using FictionArchive.Service.Shared.Services.EventBus;
 using HotChocolate.Authorization;
 using HotChocolate.Types;
 using Microsoft.EntityFrameworkCore;
@@ -15,17 +14,19 @@ namespace FictionArchive.Service.NovelService.GraphQL;
 public class Mutation
 {
     [Authorize]
-    public async Task<NovelUpdateRequestedEvent> ImportNovel(string novelUrl, NovelUpdateService service)
+    public async Task<NovelUpdateRequested> ImportNovel(string novelUrl, NovelUpdateService service)
     {
         return await service.QueueNovelImport(novelUrl);
     }
 
     [Authorize]
-    public async Task<ChapterPullRequestedEvent> FetchChapterContents(uint novelId,
-        uint chapterNumber,
+    public async Task<ChapterPullRequested> FetchChapterContents(
+        uint novelId,
+        uint volumeId,
+        uint chapterOrder,
         NovelUpdateService service)
     {
-        return await service.QueueChapterPull(novelId, chapterNumber);
+        return await service.QueueChapterPull(novelId, volumeId, chapterOrder);
     }
 
     [Error<KeyNotFoundException>]

FictionArchive.Service.NovelService/GraphQL/Query.cs

@@ -77,32 +77,45 @@ public class Query
                 }
                 : null,
 
-            Chapters = novel.Chapters.Select(chapter => new ChapterDto
+            Volumes = novel.Volumes.OrderBy(v => v.Order).Select(volume => new VolumeDto
             {
-                Id = chapter.Id,
-                CreatedTime = chapter.CreatedTime,
-                LastUpdatedTime = chapter.LastUpdatedTime,
-                Revision = chapter.Revision,
-                Order = chapter.Order,
-                Url = chapter.Url,
-                Name = chapter.Name.Texts
+                Id = volume.Id,
+                CreatedTime = volume.CreatedTime,
+                LastUpdatedTime = volume.LastUpdatedTime,
+                Order = volume.Order,
+                Name = volume.Name.Texts
                     .Where(t => t.Language == preferredLanguage)
                     .Select(t => t.Text)
                     .FirstOrDefault()
-                    ?? chapter.Name.Texts.Select(t => t.Text).FirstOrDefault()
+                    ?? volume.Name.Texts.Select(t => t.Text).FirstOrDefault()
                     ?? "",
-                Body = chapter.Body.Texts
-                    .Where(t => t.Language == preferredLanguage)
-                    .Select(t => t.Text)
-                    .FirstOrDefault()
-                    ?? chapter.Body.Texts.Select(t => t.Text).FirstOrDefault()
-                    ?? "",
-                Images = chapter.Images.Select(image => new ImageDto
+                Chapters = volume.Chapters.OrderBy(c => c.Order).Select(chapter => new ChapterDto
                 {
-                    Id = image.Id,
-                    CreatedTime = image.CreatedTime,
-                    LastUpdatedTime = image.LastUpdatedTime,
-                    NewPath = image.NewPath
+                    Id = chapter.Id,
+                    CreatedTime = chapter.CreatedTime,
+                    LastUpdatedTime = chapter.LastUpdatedTime,
+                    Revision = chapter.Revision,
+                    Order = chapter.Order,
+                    Url = chapter.Url,
+                    Name = chapter.Name.Texts
+                        .Where(t => t.Language == preferredLanguage)
+                        .Select(t => t.Text)
+                        .FirstOrDefault()
+                        ?? chapter.Name.Texts.Select(t => t.Text).FirstOrDefault()
+                        ?? "",
+                    Body = chapter.Body.Texts
+                        .Where(t => t.Language == preferredLanguage)
+                        .Select(t => t.Text)
+                        .FirstOrDefault()
+                        ?? chapter.Body.Texts.Select(t => t.Text).FirstOrDefault()
+                        ?? "",
+                    Images = chapter.Images.Select(image => new ImageDto
+                    {
+                        Id = image.Id,
+                        CreatedTime = image.CreatedTime,
+                        LastUpdatedTime = image.LastUpdatedTime,
+                        NewPath = image.NewPath
+                    }).ToList()
                 }).ToList()
             }).ToList(),
 
@@ -140,11 +153,12 @@ public class Query
     public IQueryable<ChapterReaderDto> GetChapter(
         NovelServiceDbContext dbContext,
         uint novelId,
+        uint volumeOrder,
         uint chapterOrder,
         Language preferredLanguage = Language.En)
     {
         return dbContext.Chapters
-            .Where(c => c.Novel.Id == novelId && c.Order == chapterOrder)
+            .Where(c => c.Volume.Novel.Id == novelId && c.Volume.Order == volumeOrder && c.Order == chapterOrder)
             .Select(chapter => new ChapterReaderDto
             {
                 Id = chapter.Id,
@@ -176,24 +190,74 @@ public class Query
                     NewPath = image.NewPath
                 }).ToList(),
 
-                NovelId = chapter.Novel.Id,
-                NovelName = chapter.Novel.Name.Texts
+                NovelId = chapter.Volume.Novel.Id,
+                NovelName = chapter.Volume.Novel.Name.Texts
                     .Where(t => t.Language == preferredLanguage)
                     .Select(t => t.Text)
                     .FirstOrDefault()
-                    ?? chapter.Novel.Name.Texts.Select(t => t.Text).FirstOrDefault()
+                    ?? chapter.Volume.Novel.Name.Texts.Select(t => t.Text).FirstOrDefault()
                     ?? "",
-                TotalChapters = chapter.Novel.Chapters.Count,
-                PrevChapterOrder = chapter.Novel.Chapters
+
+                // Volume context
+                VolumeId = chapter.Volume.Id,
+                VolumeName = chapter.Volume.Name.Texts
+                    .Where(t => t.Language == preferredLanguage)
+                    .Select(t => t.Text)
+                    .FirstOrDefault()
+                    ?? chapter.Volume.Name.Texts.Select(t => t.Text).FirstOrDefault()
+                    ?? "",
+                VolumeOrder = chapter.Volume.Order,
+                TotalChaptersInVolume = chapter.Volume.Chapters.Count,
+
+                // Previous chapter: first try same volume, then last chapter of previous volume
+                PrevChapterVolumeOrder = chapter.Volume.Chapters
+                    .Where(c => c.Order < chapterOrder)
+                    .OrderByDescending(c => c.Order)
+                    .Select(c => (int?)chapter.Volume.Order)
+                    .FirstOrDefault()
+                    ?? chapter.Volume.Novel.Volumes
+                        .Where(v => v.Order < chapter.Volume.Order)
+                        .OrderByDescending(v => v.Order)
+                        .SelectMany(v => v.Chapters.OrderByDescending(c => c.Order).Take(1))
+                        .Select(c => (int?)c.Volume.Order)
+                        .FirstOrDefault(),
+
+                PrevChapterOrder = chapter.Volume.Chapters
                     .Where(c => c.Order < chapterOrder)
                     .OrderByDescending(c => c.Order)
                     .Select(c => (uint?)c.Order)
-                    .FirstOrDefault(),
-                NextChapterOrder = chapter.Novel.Chapters
+                    .FirstOrDefault()
+                    ?? chapter.Volume.Novel.Volumes
+                        .Where(v => v.Order < chapter.Volume.Order)
+                        .OrderByDescending(v => v.Order)
+                        .SelectMany(v => v.Chapters.OrderByDescending(c => c.Order).Take(1))
+                        .Select(c => (uint?)c.Order)
+                        .FirstOrDefault(),
+
+                // Next chapter: first try same volume, then first chapter of next volume
+                NextChapterVolumeOrder = chapter.Volume.Chapters
+                    .Where(c => c.Order > chapterOrder)
+                    .OrderBy(c => c.Order)
+                    .Select(c => (int?)chapter.Volume.Order)
+                    .FirstOrDefault()
+                    ?? chapter.Volume.Novel.Volumes
+                        .Where(v => v.Order > chapter.Volume.Order)
+                        .OrderBy(v => v.Order)
+                        .SelectMany(v => v.Chapters.OrderBy(c => c.Order).Take(1))
+                        .Select(c => (int?)c.Volume.Order)
+                        .FirstOrDefault(),
+
+                NextChapterOrder = chapter.Volume.Chapters
                     .Where(c => c.Order > chapterOrder)
                     .OrderBy(c => c.Order)
                     .Select(c => (uint?)c.Order)
                     .FirstOrDefault()
+                    ?? chapter.Volume.Novel.Volumes
+                        .Where(v => v.Order > chapter.Volume.Order)
+                        .OrderBy(v => v.Order)
+                        .SelectMany(v => v.Chapters.OrderBy(c => c.Order).Take(1))
+                        .Select(c => (uint?)c.Order)
+                        .FirstOrDefault()
             });
     }
 }

FictionArchive.Service.NovelService/Migrations/20251229203027_AddVolumes.Designer.cs

@@ -0,0 +1,605 @@
+// <auto-generated />
+using System;
+using FictionArchive.Service.NovelService.Services;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using NodaTime;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace FictionArchive.Service.NovelService.Migrations
+{
+    [DbContext(typeof(NovelServiceDbContext))]
+    [Migration("20251229203027_AddVolumes")]
+    partial class AddVolumes
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.11")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Images.Image", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<long?>("ChapterId")
+                        .HasColumnType("bigint");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("NewPath")
+                        .HasColumnType("text");
+
+                    b.Property<string>("OriginalPath")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ChapterId");
+
+                    b.ToTable("Images");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("LocalizationKeys");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long>("EngineId")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid>("KeyRequestedForTranslationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("TranslateTo")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EngineId");
+
+                    b.HasIndex("KeyRequestedForTranslationId");
+
+                    b.ToTable("LocalizationRequests");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("Language")
+                        .HasColumnType("integer");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid?>("LocalizationKeyId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Text")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<long?>("TranslationEngineId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("LocalizationKeyId");
+
+                    b.HasIndex("TranslationEngineId");
+
+                    b.ToTable("LocalizationText");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Chapter", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Guid>("BodyId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("NameId")
+                        .HasColumnType("uuid");
+
+                    b.Property<long>("Order")
+                        .HasColumnType("bigint");
+
+                    b.Property<long>("Revision")
+                        .HasColumnType("bigint");
+
+                    b.Property<string>("Url")
+                        .HasColumnType("text");
+
+                    b.Property<long>("VolumeId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BodyId");
+
+                    b.HasIndex("NameId");
+
+                    b.HasIndex("VolumeId", "Order")
+                        .IsUnique();
+
+                    b.ToTable("Chapter");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Novel", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<long>("AuthorId")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid?>("CoverImageId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("DescriptionId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ExternalId")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("NameId")
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("RawLanguage")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("RawStatus")
+                        .HasColumnType("integer");
+
+                    b.Property<long>("SourceId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int?>("StatusOverride")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Url")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AuthorId");
+
+                    b.HasIndex("CoverImageId");
+
+                    b.HasIndex("DescriptionId");
+
+                    b.HasIndex("NameId");
+
+                    b.HasIndex("SourceId");
+
+                    b.HasIndex("ExternalId", "SourceId")
+                        .IsUnique();
+
+                    b.ToTable("Novels");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.NovelTag", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("DisplayNameId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long?>("SourceId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int>("TagType")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DisplayNameId");
+
+                    b.HasIndex("SourceId");
+
+                    b.ToTable("Tags");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Person", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("ExternalUrl")
+                        .HasColumnType("text");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("NameId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NameId");
+
+                    b.ToTable("Person");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Source", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Url")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Sources");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.TranslationEngine", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("TranslationEngines");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("NameId")
+                        .HasColumnType("uuid");
+
+                    b.Property<long>("NovelId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int>("Order")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NameId");
+
+                    b.HasIndex("NovelId", "Order")
+                        .IsUnique();
+
+                    b.ToTable("Volume");
+                });
+
+            modelBuilder.Entity("NovelNovelTag", b =>
+                {
+                    b.Property<long>("NovelsId")
+                        .HasColumnType("bigint");
+
+                    b.Property<long>("TagsId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("NovelsId", "TagsId");
+
+                    b.HasIndex("TagsId");
+
+                    b.ToTable("NovelNovelTag");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Images.Image", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Chapter", "Chapter")
+                        .WithMany("Images")
+                        .HasForeignKey("ChapterId");
+
+                    b.Navigation("Chapter");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.TranslationEngine", "Engine")
+                        .WithMany()
+                        .HasForeignKey("EngineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "KeyRequestedForTranslation")
+                        .WithMany()
+                        .HasForeignKey("KeyRequestedForTranslationId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Engine");
+
+                    b.Navigation("KeyRequestedForTranslation");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", null)
+                        .WithMany("Texts")
+                        .HasForeignKey("LocalizationKeyId");
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.TranslationEngine", "TranslationEngine")
+                        .WithMany()
+                        .HasForeignKey("TranslationEngineId");
+
+                    b.Navigation("TranslationEngine");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Chapter", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Body")
+                        .WithMany()
+                        .HasForeignKey("BodyId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Volume", "Volume")
+                        .WithMany("Chapters")
+                        .HasForeignKey("VolumeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Body");
+
+                    b.Navigation("Name");
+
+                    b.Navigation("Volume");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Novel", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Person", "Author")
+                        .WithMany()
+                        .HasForeignKey("AuthorId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Images.Image", "CoverImage")
+                        .WithMany()
+                        .HasForeignKey("CoverImageId");
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Description")
+                        .WithMany()
+                        .HasForeignKey("DescriptionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Source", "Source")
+                        .WithMany()
+                        .HasForeignKey("SourceId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Author");
+
+                    b.Navigation("CoverImage");
+
+                    b.Navigation("Description");
+
+                    b.Navigation("Name");
+
+                    b.Navigation("Source");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.NovelTag", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "DisplayName")
+                        .WithMany()
+                        .HasForeignKey("DisplayNameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Source", "Source")
+                        .WithMany()
+                        .HasForeignKey("SourceId");
+
+                    b.Navigation("DisplayName");
+
+                    b.Navigation("Source");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Person", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Name");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", "Novel")
+                        .WithMany("Volumes")
+                        .HasForeignKey("NovelId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Name");
+
+                    b.Navigation("Novel");
+                });
+
+            modelBuilder.Entity("NovelNovelTag", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", null)
+                        .WithMany()
+                        .HasForeignKey("NovelsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.NovelTag", null)
+                        .WithMany()
+                        .HasForeignKey("TagsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", b =>
+                {
+                    b.Navigation("Texts");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Chapter", b =>
+                {
+                    b.Navigation("Images");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Novel", b =>
+                {
+                    b.Navigation("Volumes");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
+                {
+                    b.Navigation("Chapters");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

FictionArchive.Service.NovelService/Migrations/20251229203027_AddVolumes.cs

@@ -0,0 +1,195 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using NodaTime;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace FictionArchive.Service.NovelService.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddVolumes : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // 1. Create the Volume table
+            migrationBuilder.CreateTable(
+                name: "Volume",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Order = table.Column<int>(type: "integer", nullable: false),
+                    NameId = table.Column<Guid>(type: "uuid", nullable: false),
+                    NovelId = table.Column<long>(type: "bigint", nullable: false),
+                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Volume", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Volume_LocalizationKeys_NameId",
+                        column: x => x.NameId,
+                        principalTable: "LocalizationKeys",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Volume_Novels_NovelId",
+                        column: x => x.NovelId,
+                        principalTable: "Novels",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Volume_NameId",
+                table: "Volume",
+                column: "NameId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Volume_NovelId_Order",
+                table: "Volume",
+                columns: new[] { "NovelId", "Order" },
+                unique: true);
+
+            // 2. Add nullable VolumeId column to Chapter (keep NovelId for now)
+            migrationBuilder.AddColumn<long>(
+                name: "VolumeId",
+                table: "Chapter",
+                type: "bigint",
+                nullable: true);
+
+            // 3. Data migration: Create volumes and link chapters for each novel
+            migrationBuilder.Sql(@"
+DO $$
+DECLARE
+    novel_rec RECORD;
+    loc_key_id uuid;
+    volume_id bigint;
+BEGIN
+    FOR novel_rec IN SELECT ""Id"", ""RawLanguage"" FROM ""Novels"" LOOP
+        -- Create LocalizationKey for volume name
+        loc_key_id := gen_random_uuid();
+        INSERT INTO ""LocalizationKeys"" (""Id"", ""CreatedTime"", ""LastUpdatedTime"")
+        VALUES (loc_key_id, NOW(), NOW());
+
+        -- Create LocalizationText for 'Main Story' in novel's raw language
+        INSERT INTO ""LocalizationText"" (""Id"", ""LocalizationKeyId"", ""Language"", ""Text"", ""CreatedTime"", ""LastUpdatedTime"")
+        VALUES (gen_random_uuid(), loc_key_id, novel_rec.""RawLanguage"", 'Main Story', NOW(), NOW());
+
+        -- Create Volume for this novel
+        INSERT INTO ""Volume"" (""Order"", ""NameId"", ""NovelId"", ""CreatedTime"", ""LastUpdatedTime"")
+        VALUES (1, loc_key_id, novel_rec.""Id"", NOW(), NOW())
+        RETURNING ""Id"" INTO volume_id;
+
+        -- Link all chapters of this novel to the new volume
+        UPDATE ""Chapter"" SET ""VolumeId"" = volume_id WHERE ""NovelId"" = novel_rec.""Id"";
+    END LOOP;
+END $$;
+            ");
+
+            // 4. Drop old FK and index for NovelId
+            migrationBuilder.DropForeignKey(
+                name: "FK_Chapter_Novels_NovelId",
+                table: "Chapter");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Chapter_NovelId",
+                table: "Chapter");
+
+            // 5. Drop NovelId column from Chapter
+            migrationBuilder.DropColumn(
+                name: "NovelId",
+                table: "Chapter");
+
+            // 6. Make VolumeId non-nullable
+            migrationBuilder.AlterColumn<long>(
+                name: "VolumeId",
+                table: "Chapter",
+                type: "bigint",
+                nullable: false,
+                oldClrType: typeof(long),
+                oldType: "bigint",
+                oldNullable: true);
+
+            // 7. Add unique index and FK for VolumeId
+            migrationBuilder.CreateIndex(
+                name: "IX_Chapter_VolumeId_Order",
+                table: "Chapter",
+                columns: new[] { "VolumeId", "Order" },
+                unique: true);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Chapter_Volume_VolumeId",
+                table: "Chapter",
+                column: "VolumeId",
+                principalTable: "Volume",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            // Add back NovelId column
+            migrationBuilder.AddColumn<long>(
+                name: "NovelId",
+                table: "Chapter",
+                type: "bigint",
+                nullable: true);
+
+            // Migrate data back: set NovelId from Volume
+            migrationBuilder.Sql(@"
+UPDATE ""Chapter"" c
+SET ""NovelId"" = v.""NovelId""
+FROM ""Volume"" v
+WHERE c.""VolumeId"" = v.""Id"";
+            ");
+
+            // Make NovelId non-nullable
+            migrationBuilder.AlterColumn<long>(
+                name: "NovelId",
+                table: "Chapter",
+                type: "bigint",
+                nullable: false,
+                oldClrType: typeof(long),
+                oldType: "bigint",
+                oldNullable: true);
+
+            // Drop VolumeId FK and index
+            migrationBuilder.DropForeignKey(
+                name: "FK_Chapter_Volume_VolumeId",
+                table: "Chapter");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Chapter_VolumeId_Order",
+                table: "Chapter");
+
+            // Drop VolumeId column
+            migrationBuilder.DropColumn(
+                name: "VolumeId",
+                table: "Chapter");
+
+            // Recreate NovelId index and FK
+            migrationBuilder.CreateIndex(
+                name: "IX_Chapter_NovelId",
+                table: "Chapter",
+                column: "NovelId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Chapter_Novels_NovelId",
+                table: "Chapter",
+                column: "NovelId",
+                principalTable: "Novels",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            // Note: Volume LocalizationKeys are not cleaned up in Down migration
+            // as they may have been modified. Manual cleanup may be needed.
+            migrationBuilder.DropTable(
+                name: "Volume");
+        }
+    }
+}

FictionArchive.Service.NovelService/Migrations/NovelServiceDbContextModelSnapshot.cs

@@ -153,9 +153,6 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Guid>("NameId")
                         .HasColumnType("uuid");
 
-                    b.Property<long>("NovelId")
-                        .HasColumnType("bigint");
-
                     b.Property<long>("Order")
                         .HasColumnType("bigint");
 
@@ -165,13 +162,17 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<string>("Url")
                         .HasColumnType("text");
 
+                    b.Property<long>("VolumeId")
+                        .HasColumnType("bigint");
+
                     b.HasKey("Id");
 
                     b.HasIndex("BodyId");
 
                     b.HasIndex("NameId");
 
-                    b.HasIndex("NovelId");
+                    b.HasIndex("VolumeId", "Order")
+                        .IsUnique();
 
                     b.ToTable("Chapter");
                 });
@@ -357,6 +358,39 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.ToTable("TranslationEngines");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("NameId")
+                        .HasColumnType("uuid");
+
+                    b.Property<long>("NovelId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int>("Order")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NameId");
+
+                    b.HasIndex("NovelId", "Order")
+                        .IsUnique();
+
+                    b.ToTable("Volume");
+                });
+
             modelBuilder.Entity("NovelNovelTag", b =>
                 {
                     b.Property<long>("NovelsId")
@@ -427,9 +461,9 @@ namespace FictionArchive.Service.NovelService.Migrations
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
 
-                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", "Novel")
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Volume", "Volume")
                         .WithMany("Chapters")
-                        .HasForeignKey("NovelId")
+                        .HasForeignKey("VolumeId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
 
@@ -437,7 +471,7 @@ namespace FictionArchive.Service.NovelService.Migrations
 
                     b.Navigation("Name");
 
-                    b.Navigation("Novel");
+                    b.Navigation("Volume");
                 });
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Novel", b =>
@@ -509,6 +543,25 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Navigation("Name");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", "Novel")
+                        .WithMany("Volumes")
+                        .HasForeignKey("NovelId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Name");
+
+                    b.Navigation("Novel");
+                });
+
             modelBuilder.Entity("NovelNovelTag", b =>
                 {
                     b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", null)
@@ -535,6 +588,11 @@ namespace FictionArchive.Service.NovelService.Migrations
                 });
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Novel", b =>
+                {
+                    b.Navigation("Volumes");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Volume", b =>
                 {
                     b.Navigation("Chapters");
                 });

FictionArchive.Service.NovelService/Models/DTOs/ChapterReaderDto.cs

@@ -12,7 +12,16 @@ public class ChapterReaderDto : BaseDto<uint>
     // Navigation context
     public uint NovelId { get; init; }
     public required string NovelName { get; init; }
-    public int TotalChapters { get; init; }
+
+    // Volume context
+    public uint VolumeId { get; init; }
+    public required string VolumeName { get; init; }
+    public int VolumeOrder { get; init; }
+    public int TotalChaptersInVolume { get; init; }
+
+    // Cross-volume navigation (VolumeOrder + ChapterOrder identify a chapter)
+    public int? PrevChapterVolumeOrder { get; init; }
     public uint? PrevChapterOrder { get; init; }
+    public int? NextChapterVolumeOrder { get; init; }
     public uint? NextChapterOrder { get; init; }
 }

FictionArchive.Service.NovelService/Models/DTOs/NovelDto.cs

@@ -14,7 +14,7 @@ public class NovelDto : BaseDto<uint>
     public required string ExternalId { get; init; }
     public required string Name { get; init; }
     public required string Description { get; init; }
-    public required List<ChapterDto> Chapters { get; init; }
+    public required List<VolumeDto> Volumes { get; init; }
     public required List<NovelTagDto> Tags { get; init; }
     public ImageDto? CoverImage { get; init; }
 }

FictionArchive.Service.NovelService/Models/DTOs/VolumeDto.cs

@@ -0,0 +1,8 @@
+namespace FictionArchive.Service.NovelService.Models.DTOs;
+
+public class VolumeDto : BaseDto<uint>
+{
+    public int Order { get; init; }
+    public required string Name { get; init; }
+    public required List<ChapterDto> Chapters { get; init; }
+}

FictionArchive.Service.NovelService/Models/IntegrationEvents/ChapterPullRequestedEvent.cs

@@ -1,9 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
-
-public class ChapterPullRequestedEvent : IIntegrationEvent
-{
-    public uint NovelId { get; set; }
-    public uint ChapterNumber { get; set; }
-}

FictionArchive.Service.NovelService/Models/IntegrationEvents/FileUploadRequestCreatedEvent.cs

@@ -1,10 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.FileService.IntegrationEvents;
-
-public class FileUploadRequestCreatedEvent : IIntegrationEvent
-{
-    public Guid RequestId { get; set; }
-    public string FilePath { get; set; }
-    public byte[] FileData { get; set; }
-}

FictionArchive.Service.NovelService/Models/IntegrationEvents/FileUploadRequestStatusUpdateEvent.cs

@@ -1,22 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
-
-public class FileUploadRequestStatusUpdateEvent : IIntegrationEvent
-{
-    public Guid RequestId { get; set; }
-    public RequestStatus Status { get; set; }
-    
-    #region Success
-    
-    public string? FileAccessUrl { get; set; }
-    
-    #endregion
-    
-    #region Failure
-    
-    public string? ErrorMessage { get; set; }
-    
-    #endregion
-}

FictionArchive.Service.NovelService/Models/IntegrationEvents/NovelUpdateRequestedEvent.cs

@@ -1,8 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
-
-public class NovelUpdateRequestedEvent : IIntegrationEvent
-{
-    public string NovelUrl { get; set; }
-}

FictionArchive.Service.NovelService/Models/IntegrationEvents/TranslationRequestCompletedEvent.cs

@@ -1,17 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
-
-public class TranslationRequestCompletedEvent : IIntegrationEvent
-{
-    /// <summary>
-    /// Maps this event back to a triggering request.
-    /// </summary>
-    public Guid? TranslationRequestId { get; set; }
-    
-    /// <summary>
-    /// The resulting text.
-    /// </summary>
-    public string? TranslatedText { get; set; }
-}

FictionArchive.Service.NovelService/Models/IntegrationEvents/TranslationRequestCreatedEvent.cs

@@ -1,13 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
-
-public class TranslationRequestCreatedEvent : IIntegrationEvent
-{
-    public Guid TranslationRequestId { get; set; }
-    public Language From { get; set; }
-    public Language To { get; set; }
-    public string Body { get; set; }
-    public string TranslationEngineKey { get; set; }
-}

FictionArchive.Service.NovelService/Models/Novels/Chapter.cs

@@ -20,7 +20,7 @@ public class Chapter : BaseEntity<uint>
     
     #region Navigation Properties
 
-    public Novel Novel { get; set; }
+    public Volume Volume { get; set; }
 
     #endregion
 }

FictionArchive.Service.NovelService/Models/Novels/Novel.cs

@@ -21,7 +21,7 @@ public class Novel : BaseEntity<uint>
     public LocalizationKey Name { get; set; }
     public LocalizationKey Description { get; set; }
     
-    public List<Chapter> Chapters { get; set; }
+    public List<Volume> Volumes { get; set; }
     public List<NovelTag> Tags { get; set; }
     public Image? CoverImage { get; set; }
 }

FictionArchive.Service.NovelService/Models/Novels/Volume.cs

@@ -0,0 +1,24 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using FictionArchive.Service.NovelService.Models.Localization;
+using FictionArchive.Service.Shared.Models;
+
+namespace FictionArchive.Service.NovelService.Models.Novels;
+
+[Table("Volume")]
+public class Volume : BaseEntity<uint>
+{
+    /// <summary>
+    /// Signed int to allow special ordering like -1 for "Author Notes" at top.
+    /// </summary>
+    public int Order { get; set; }
+
+    public LocalizationKey Name { get; set; }
+
+    public List<Chapter> Chapters { get; set; }
+
+    #region Navigation Properties
+
+    public Novel Novel { get; set; }
+
+    #endregion
+}

FictionArchive.Service.NovelService/Models/SourceAdapters/NovelMetadata.cs

@@ -16,7 +16,7 @@ public class NovelMetadata
     public Language RawLanguage { get; set; }
     public NovelStatus RawStatus { get; set; }
     
-    public List<ChapterMetadata> Chapters { get; set; }
+    public List<VolumeMetadata> Volumes { get; set; }
     public List<string> SourceTags { get; set; }
     public List<string> SystemTags { get; set; }
     public SourceDescriptor SourceDescriptor { get; set; }

FictionArchive.Service.NovelService/Models/SourceAdapters/VolumeMetadata.cs

@@ -0,0 +1,8 @@
+namespace FictionArchive.Service.NovelService.Models.SourceAdapters;
+
+public class VolumeMetadata
+{
+    public int Order { get; set; }
+    public string Name { get; set; }
+    public List<ChapterMetadata> Chapters { get; set; }
+}

FictionArchive.Service.NovelService/Program.cs

@@ -1,14 +1,12 @@
 using FictionArchive.Common.Extensions;
+using FictionArchive.Service.NovelService.Consumers;
 using FictionArchive.Service.NovelService.GraphQL;
 using FictionArchive.Service.NovelService.Models.Configuration;
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
 using FictionArchive.Service.NovelService.Services;
-using FictionArchive.Service.NovelService.Services.EventHandlers;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
 using FictionArchive.Service.NovelService.Services.SourceAdapters.Novelpia;
 using FictionArchive.Service.Shared;
 using FictionArchive.Service.Shared.Extensions;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using FictionArchive.Service.Shared.Services.GraphQL;
 using Microsoft.EntityFrameworkCore;
 
@@ -25,18 +23,19 @@ public class Program
         
         builder.Services.AddMemoryCache();
         
-        #region Event Bus
+        #region MassTransit
 
         if (!isSchemaExport)
         {
-            builder.Services.AddRabbitMQ(opt =>
-            {
-                builder.Configuration.GetSection("RabbitMQ").Bind(opt);
-            })
-                .Subscribe<TranslationRequestCompletedEvent, TranslationRequestCompletedEventHandler>()
-                .Subscribe<NovelUpdateRequestedEvent, NovelUpdateRequestedEventHandler>()
-                .Subscribe<ChapterPullRequestedEvent, ChapterPullRequestedEventHandler>()
-                .Subscribe<FileUploadRequestStatusUpdateEvent, FileUploadRequestStatusUpdateEventHandler>();
+            builder.Services.AddFictionArchiveMassTransit(
+                builder.Configuration,
+                x =>
+                {
+                    x.AddConsumer<TranslationRequestCompletedConsumer>();
+                    x.AddConsumer<FileUploadRequestStatusUpdateConsumer>();
+                    x.AddConsumer<NovelUpdateRequestedConsumer>();
+                    x.AddConsumer<ChapterPullRequestedConsumer>();
+                });
         }
 
         #endregion

FictionArchive.Service.NovelService/Services/EventHandlers/ChapterPullRequestedEventHandler.cs

@@ -1,19 +0,0 @@
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Services.EventHandlers;
-
-public class ChapterPullRequestedEventHandler : IIntegrationEventHandler<ChapterPullRequestedEvent>
-{
-    private readonly NovelUpdateService _novelUpdateService;
-
-    public ChapterPullRequestedEventHandler(NovelUpdateService novelUpdateService)
-    {
-        _novelUpdateService = novelUpdateService;
-    }
-
-    public async Task Handle(ChapterPullRequestedEvent @event)
-    {
-        await _novelUpdateService.PullChapterContents(@event.NovelId, @event.ChapterNumber);
-    }
-}

FictionArchive.Service.NovelService/Services/EventHandlers/FileUploadRequestStatusUpdateEventHandler.cs

@@ -1,39 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Services.EventHandlers;
-
-public class FileUploadRequestStatusUpdateEventHandler : IIntegrationEventHandler<FileUploadRequestStatusUpdateEvent>
-{
-    private readonly ILogger<FileUploadRequestStatusUpdateEventHandler> _logger;
-    private readonly NovelServiceDbContext _context;
-    private readonly NovelUpdateService _novelUpdateService;
-
-    public FileUploadRequestStatusUpdateEventHandler(ILogger<FileUploadRequestStatusUpdateEventHandler> logger, NovelServiceDbContext context, NovelUpdateService novelUpdateService)
-    {
-        _logger = logger;
-        _context = context;
-        _novelUpdateService = novelUpdateService;
-    }
-
-    public async Task Handle(FileUploadRequestStatusUpdateEvent @event)
-    {
-        var image = await _context.Images.FindAsync(@event.RequestId);
-        if (image == null)
-        {
-            // Not a request we care about.
-            return;
-        }
-        if (@event.Status == RequestStatus.Failed)
-        {
-            _logger.LogError("Image upload failed for image with id {imageId}", image.Id);
-            return;
-        }
-        else if (@event.Status == RequestStatus.Success)
-        {
-            _logger.LogInformation("Image upload succeeded for image with id {imageId}", image.Id);
-            await _novelUpdateService.UpdateImage(image.Id, @event.FileAccessUrl);
-        }
-    }
-}

FictionArchive.Service.NovelService/Services/EventHandlers/NovelUpdateRequestedEventHandler.cs

@@ -1,23 +0,0 @@
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.NovelService.Services.EventHandlers;
-
-public class NovelUpdateRequestedEventHandler : IIntegrationEventHandler<NovelUpdateRequestedEvent>
-{
-    private readonly ILogger<NovelUpdateRequestedEventHandler> _logger;
-    private readonly IEventBus _eventBus;
-    private readonly NovelUpdateService _novelUpdateService;
-
-    public NovelUpdateRequestedEventHandler(ILogger<NovelUpdateRequestedEventHandler> logger, IEventBus eventBus, NovelUpdateService novelUpdateService)
-    {
-        _logger = logger;
-        _eventBus = eventBus;
-        _novelUpdateService = novelUpdateService;
-    }
-
-    public async Task Handle(NovelUpdateRequestedEvent @event)
-    {
-        await _novelUpdateService.ImportNovel(@event.NovelUrl);
-    }
-}

FictionArchive.Service.NovelService/Services/EventHandlers/TranslationRequestCompletedEventHandler.cs

@@ -1,39 +0,0 @@
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
-using FictionArchive.Service.NovelService.Models.Localization;
-using FictionArchive.Service.Shared.Services.EventBus;
-using Microsoft.EntityFrameworkCore;
-
-namespace FictionArchive.Service.NovelService.Services.EventHandlers;
-
-public class TranslationRequestCompletedEventHandler : IIntegrationEventHandler<TranslationRequestCompletedEvent>
-{
-    private readonly ILogger<TranslationRequestCompletedEventHandler> _logger;
-    private readonly NovelServiceDbContext _dbContext;
-
-    public TranslationRequestCompletedEventHandler(ILogger<TranslationRequestCompletedEventHandler> logger, NovelServiceDbContext dbContext)
-    {
-        _logger = logger;
-        _dbContext = dbContext;
-    }
-
-    public async Task Handle(TranslationRequestCompletedEvent @event)
-    {
-        var localizationRequest = await _dbContext.LocalizationRequests.Include(r => r.KeyRequestedForTranslation)
-            .ThenInclude(lk => lk.Texts)
-            .FirstOrDefaultAsync(lk => lk.Id == @event.TranslationRequestId);
-        if (localizationRequest == null)
-        {
-            // Not one of our requests, discard it
-            return;
-        }
-        
-        localizationRequest.KeyRequestedForTranslation.Texts.Add(new LocalizationText()
-        {
-            Language = localizationRequest.TranslateTo,
-            Text = @event.TranslatedText,
-            TranslationEngine = localizationRequest.Engine
-        });
-        _dbContext.LocalizationRequests.Remove(localizationRequest);
-        await _dbContext.SaveChangesAsync();
-    }
-}

FictionArchive.Service.NovelService/Services/NovelServiceDbContext.cs

@@ -10,6 +10,7 @@ public class NovelServiceDbContext(DbContextOptions options, ILogger<NovelServic
     : FictionArchiveDbContext(options, logger)
 {
     public DbSet<Novel> Novels { get; set; }
+    public DbSet<Volume> Volumes { get; set; }
     public DbSet<Chapter> Chapters { get; set; }
     public DbSet<Source> Sources { get; set; }
     public DbSet<TranslationEngine> TranslationEngines { get; set; }
@@ -25,5 +26,15 @@ public class NovelServiceDbContext(DbContextOptions options, ILogger<NovelServic
         modelBuilder.Entity<Novel>()
             .HasIndex("ExternalId", "SourceId")
             .IsUnique();
+
+        // Volume.Order is unique per Novel
+        modelBuilder.Entity<Volume>()
+            .HasIndex("NovelId", "Order")
+            .IsUnique();
+
+        // Chapter.Order is unique per Volume
+        modelBuilder.Entity<Chapter>()
+            .HasIndex("VolumeId", "Order")
+            .IsUnique();
     }
 }

FictionArchive.Service.NovelService/Services/NovelUpdateService.cs

@@ -1,15 +1,15 @@
 using FictionArchive.Common.Enums;
-using FictionArchive.Service.FileService.IntegrationEvents;
+using FictionArchive.Service.NovelService.Contracts;
 using FictionArchive.Service.NovelService.Models.Configuration;
 using FictionArchive.Service.NovelService.Models.Enums;
 using FictionArchive.Service.NovelService.Models.Images;
-using FictionArchive.Service.NovelService.Models.IntegrationEvents;
 using FictionArchive.Service.NovelService.Models.Localization;
 using FictionArchive.Service.NovelService.Models.Novels;
 using FictionArchive.Service.NovelService.Models.SourceAdapters;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
-using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.Shared.Contracts.Events;
 using HtmlAgilityPack;
+using MassTransit;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Options;
 
@@ -20,15 +20,15 @@ public class NovelUpdateService
     private readonly NovelServiceDbContext _dbContext;
     private readonly ILogger<NovelUpdateService> _logger;
     private readonly IEnumerable<ISourceAdapter> _sourceAdapters;
-    private readonly IEventBus _eventBus;
+    private readonly IPublishEndpoint _publishEndpoint;
     private readonly NovelUpdateServiceConfiguration _novelUpdateServiceConfiguration;
 
-    public NovelUpdateService(NovelServiceDbContext dbContext, ILogger<NovelUpdateService> logger, IEnumerable<ISourceAdapter> sourceAdapters, IEventBus eventBus, IOptions<NovelUpdateServiceConfiguration> novelUpdateServiceConfiguration)
+    public NovelUpdateService(NovelServiceDbContext dbContext, ILogger<NovelUpdateService> logger, IEnumerable<ISourceAdapter> sourceAdapters, IPublishEndpoint publishEndpoint, IOptions<NovelUpdateServiceConfiguration> novelUpdateServiceConfiguration)
     {
         _dbContext = dbContext;
         _logger = logger;
         _sourceAdapters = sourceAdapters;
-        _eventBus = eventBus;
+        _publishEndpoint = publishEndpoint;
         _novelUpdateServiceConfiguration = novelUpdateServiceConfiguration.Value;
     }
 
@@ -190,6 +190,48 @@ public class NovelUpdateService
         return existingChapters.Concat(newChapters).ToList();
     }
 
+    private static List<Volume> SynchronizeVolumes(
+        List<VolumeMetadata> metadataVolumes,
+        Language rawLanguage,
+        List<Volume>? existingVolumes)
+    {
+        existingVolumes ??= new List<Volume>();
+        var result = new List<Volume>();
+
+        foreach (var metaVolume in metadataVolumes)
+        {
+            // Match volumes by Order (unique per novel)
+            var existingVolume = existingVolumes.FirstOrDefault(v => v.Order == metaVolume.Order);
+
+            if (existingVolume != null)
+            {
+                // Volume exists - sync its chapters
+                existingVolume.Chapters = SynchronizeChapters(
+                    metaVolume.Chapters,
+                    rawLanguage,
+                    existingVolume.Chapters);
+                result.Add(existingVolume);
+            }
+            else
+            {
+                // New volume - create it with synced chapters
+                var newVolume = new Volume
+                {
+                    Order = metaVolume.Order,
+                    Name = LocalizationKey.CreateFromText(metaVolume.Name, rawLanguage),
+                    Chapters = SynchronizeChapters(metaVolume.Chapters, rawLanguage, null)
+                };
+                result.Add(newVolume);
+            }
+        }
+
+        // Keep existing volumes not in metadata (user-created volumes)
+        var metaOrders = metadataVolumes.Select(v => v.Order).ToHashSet();
+        result.AddRange(existingVolumes.Where(v => !metaOrders.Contains(v.Order)));
+
+        return result;
+    }
+
     private static (Image? image, bool shouldPublishEvent) HandleCoverImage(
         ImageData? newCoverData,
         Image? existingCoverImage)
@@ -232,7 +274,7 @@ public class NovelUpdateService
             metadata.SystemTags,
             metadata.RawLanguage);
 
-        var chapters = SynchronizeChapters(metadata.Chapters, metadata.RawLanguage, null);
+        var volumes = SynchronizeVolumes(metadata.Volumes, metadata.RawLanguage, null);
 
         var novel = new Novel
         {
@@ -243,7 +285,7 @@ public class NovelUpdateService
             CoverImage = metadata.CoverImage != null
                 ? new Image { OriginalPath = metadata.CoverImage.Url }
                 : null,
-            Chapters = chapters,
+            Volumes = volumes,
             Description = LocalizationKey.CreateFromText(metadata.Description, metadata.RawLanguage),
             Name = LocalizationKey.CreateFromText(metadata.Name, metadata.RawLanguage),
             RawStatus = metadata.RawStatus,
@@ -289,9 +331,12 @@ public class NovelUpdateService
             .Include(n => n.Description)
             .ThenInclude(lk => lk.Texts)
             .Include(n => n.Tags)
-            .Include(n => n.Chapters).ThenInclude(chapter => chapter.Body)
+            .Include(n => n.Volumes)
+            .ThenInclude(volume => volume.Chapters)
+            .ThenInclude(chapter => chapter.Body)
             .ThenInclude(localizationKey => localizationKey.Texts)
-            .Include(n => n.CoverImage)
+            .Include(n => n.CoverImage).Include(novel => novel.Volumes).ThenInclude(volume => volume.Chapters)
+            .ThenInclude(chapter => chapter.Name)
             .FirstOrDefaultAsync(n =>
                 n.ExternalId == metadata.ExternalId &&
                 n.Source.Key == metadata.SourceDescriptor.Key);
@@ -299,6 +344,12 @@ public class NovelUpdateService
         Novel novel;
         bool shouldPublishCoverEvent;
 
+        // Capture existing chapter IDs to detect new chapters later
+        var existingChapterIds = existingNovel?.Volumes
+            .SelectMany(v => v.Chapters)
+            .Select(c => c.Id)
+            .ToHashSet() ?? new HashSet<uint>();
+
         if (existingNovel == null)
         {
             // CREATE PATH: New novel
@@ -326,11 +377,11 @@ public class NovelUpdateService
                 metadata.SystemTags,
                 metadata.RawLanguage);
 
-            // Synchronize chapters (add only)
-            novel.Chapters = SynchronizeChapters(
-                metadata.Chapters,
+            // Synchronize volumes (and their chapters)
+            novel.Volumes = SynchronizeVolumes(
+                metadata.Volumes,
                 metadata.RawLanguage,
-                existingNovel.Chapters);
+                existingNovel.Volumes);
 
             // Handle cover image
             (novel.CoverImage, shouldPublishCoverEvent) = HandleCoverImage(
@@ -340,43 +391,74 @@ public class NovelUpdateService
 
         await _dbContext.SaveChangesAsync();
 
+        // Publish novel created event for new novels
+        if (existingNovel == null)
+        {
+            await _publishEndpoint.Publish<INovelCreated>(new NovelCreated(
+                novel.Id,
+                novel.Name.Texts.First(t => t.Language == novel.RawLanguage).Text,
+                novel.RawLanguage,
+                novel.Source.Key,
+                novel.Author.Name.Texts.First(t => t.Language == novel.RawLanguage).Text));
+        }
+
+        // Publish chapter created events for new chapters
+        foreach (var volume in novel.Volumes)
+        {
+            foreach (var chapter in volume.Chapters.Where(c => !existingChapterIds.Contains(c.Id)))
+            {
+                await _publishEndpoint.Publish<IChapterCreated>(new ChapterCreated(
+                    chapter.Id,
+                    novel.Id,
+                    volume.Id,
+                    (uint)volume.Order,
+                    chapter.Order,
+                    chapter.Name.Texts.First(t => t.Language == novel.RawLanguage).Text));
+            }
+        }
+
         // Publish cover image event if needed
         if (shouldPublishCoverEvent && novel.CoverImage != null && metadata.CoverImage != null)
         {
-            await _eventBus.Publish(new FileUploadRequestCreatedEvent
-            {
-                RequestId = novel.CoverImage.Id,
-                FileData = metadata.CoverImage.Data,
-                FilePath = $"Novels/{novel.Id}/Images/cover.jpg"
-            });
+            await _publishEndpoint.Publish<IFileUploadRequestCreated>(new FileUploadRequestCreated(
+                novel.CoverImage.Id,
+                $"Novels/{novel.Id}/Images/cover.jpg",
+                metadata.CoverImage.Data));
         }
 
         // Publish chapter pull events for chapters without body content
-        var chaptersNeedingPull = novel.Chapters
-            .Where(c => c.Body?.Texts == null || !c.Body.Texts.Any())
-            .ToList();
-
-        foreach (var chapter in chaptersNeedingPull)
+        foreach (var volume in novel.Volumes)
         {
-            await _eventBus.Publish(new ChapterPullRequestedEvent
+            var chaptersNeedingPull = volume.Chapters
+                .Where(c => c.Body?.Texts == null || !c.Body.Texts.Any())
+                .ToList();
+
+            foreach (var chapter in chaptersNeedingPull)
             {
-                NovelId = novel.Id,
-                ChapterNumber = chapter.Order
-            });
+                await _publishEndpoint.Publish<IChapterPullRequested>(new ChapterPullRequested(
+                    novel.Id,
+                    volume.Id,
+                    chapter.Order));
+            }
         }
 
         return novel;
     }
 
-    public async Task<Chapter> PullChapterContents(uint novelId, uint chapterNumber)
+    public async Task<Chapter> PullChapterContents(uint novelId, uint volumeId, uint chapterOrder)
     {
         var novel = await _dbContext.Novels.Where(novel => novel.Id == novelId)
-            .Include(novel => novel.Chapters)
+            .Include(novel => novel.Volumes)
+            .ThenInclude(volume => volume.Chapters)
             .ThenInclude(chapter => chapter.Body)
             .ThenInclude(body => body.Texts)
-            .Include(novel => novel.Source).Include(novel => novel.Chapters).ThenInclude(chapter => chapter.Images)
+            .Include(novel => novel.Source)
+            .Include(novel => novel.Volumes)
+            .ThenInclude(volume => volume.Chapters)
+            .ThenInclude(chapter => chapter.Images)
             .FirstOrDefaultAsync();
-        var chapter = novel.Chapters.Where(chapter => chapter.Order == chapterNumber).FirstOrDefault();
+        var volume = novel.Volumes.FirstOrDefault(v => v.Id == volumeId);
+        var chapter = volume.Chapters.FirstOrDefault(c => c.Order == chapterOrder);
         var adapter = _sourceAdapters.FirstOrDefault(adapter => adapter.SourceDescriptor.Key == novel.Source.Key);
         var rawChapter = await adapter.GetRawChapter(chapter.Url);
         
@@ -429,12 +511,10 @@ public class NovelUpdateService
         foreach (var image in chapter.Images)
         {
             var data = rawChapter.ImageData.FirstOrDefault(img => img.Url == image.OriginalPath);
-            await _eventBus.Publish(new FileUploadRequestCreatedEvent()
-            {
-                FileData = data.Data,
-                FilePath = $"{novel.Id}/Images/Chapter-{chapter.Id}/{imgCount++}.jpg",
-                RequestId = image.Id
-            });
+            await _publishEndpoint.Publish<IFileUploadRequestCreated>(new FileUploadRequestCreated(
+                image.Id,
+                $"Novels/{novel.Id}/Images/Chapter-{chapter.Id}/{imgCount++}.jpg",
+                data.Data));
         }
 
         return chapter;
@@ -468,24 +548,17 @@ public class NovelUpdateService
         await _dbContext.SaveChangesAsync();
     }
 
-    public async Task<NovelUpdateRequestedEvent> QueueNovelImport(string novelUrl)
+    public async Task<NovelUpdateRequested> QueueNovelImport(string novelUrl)
     {
-        var importNovelRequestEvent = new NovelUpdateRequestedEvent()
-        {
-            NovelUrl = novelUrl
-        };
-        await _eventBus.Publish(importNovelRequestEvent);
+        var importNovelRequestEvent = new NovelUpdateRequested(novelUrl);
+        await _publishEndpoint.Publish<INovelUpdateRequested>(importNovelRequestEvent);
         return importNovelRequestEvent;
     }
 
-    public async Task<ChapterPullRequestedEvent> QueueChapterPull(uint novelId, uint chapterNumber)
+    public async Task<ChapterPullRequested> QueueChapterPull(uint novelId, uint volumeId, uint chapterOrder)
     {
-        var chapterPullEvent = new ChapterPullRequestedEvent()
-        {
-            NovelId = novelId,
-            ChapterNumber = chapterNumber
-        };
-        await _eventBus.Publish(chapterPullEvent);
+        var chapterPullEvent = new ChapterPullRequested(novelId, volumeId, chapterOrder);
+        await _publishEndpoint.Publish<IChapterPullRequested>(chapterPullEvent);
         return chapterPullEvent;
     }
 
@@ -495,9 +568,10 @@ public class NovelUpdateService
             .Include(n => n.CoverImage)
             .Include(n => n.Name).ThenInclude(k => k.Texts)
             .Include(n => n.Description).ThenInclude(k => k.Texts)
-            .Include(n => n.Chapters).ThenInclude(c => c.Images)
-            .Include(n => n.Chapters).ThenInclude(c => c.Name).ThenInclude(k => k.Texts)
-            .Include(n => n.Chapters).ThenInclude(c => c.Body).ThenInclude(k => k.Texts)
+            .Include(n => n.Volumes).ThenInclude(v => v.Name).ThenInclude(k => k.Texts)
+            .Include(n => n.Volumes).ThenInclude(v => v.Chapters).ThenInclude(c => c.Images)
+            .Include(n => n.Volumes).ThenInclude(v => v.Chapters).ThenInclude(c => c.Name).ThenInclude(k => k.Texts)
+            .Include(n => n.Volumes).ThenInclude(v => v.Chapters).ThenInclude(c => c.Body).ThenInclude(k => k.Texts)
             .FirstOrDefaultAsync(n => n.Id == novelId);
 
         if (novel == null)
@@ -505,8 +579,12 @@ public class NovelUpdateService
 
         // Collect all LocalizationKey IDs for cleanup
         var locKeyIds = new List<Guid> { novel.Name.Id, novel.Description.Id };
-        locKeyIds.AddRange(novel.Chapters.Select(c => c.Name.Id));
-        locKeyIds.AddRange(novel.Chapters.Select(c => c.Body.Id));
+        foreach (var volume in novel.Volumes)
+        {
+            locKeyIds.Add(volume.Name.Id);
+            locKeyIds.AddRange(volume.Chapters.Select(c => c.Name.Id));
+            locKeyIds.AddRange(volume.Chapters.Select(c => c.Body.Id));
+        }
 
         // 1. Remove LocalizationRequests referencing these keys
         var locRequests = await _dbContext.LocalizationRequests
@@ -517,19 +595,26 @@ public class NovelUpdateService
         // 2. Remove LocalizationTexts (NO ACTION FK - won't cascade)
         _dbContext.RemoveRange(novel.Name.Texts);
         _dbContext.RemoveRange(novel.Description.Texts);
-        foreach (var chapter in novel.Chapters)
+        foreach (var volume in novel.Volumes)
         {
-            _dbContext.RemoveRange(chapter.Name.Texts);
-            _dbContext.RemoveRange(chapter.Body.Texts);
+            _dbContext.RemoveRange(volume.Name.Texts);
+            foreach (var chapter in volume.Chapters)
+            {
+                _dbContext.RemoveRange(chapter.Name.Texts);
+                _dbContext.RemoveRange(chapter.Body.Texts);
+            }
         }
 
         // 3. Remove Images (NO ACTION FK - won't cascade)
         if (novel.CoverImage != null)
             _dbContext.Images.Remove(novel.CoverImage);
-        foreach (var chapter in novel.Chapters)
-            _dbContext.Images.RemoveRange(chapter.Images);
+        foreach (var volume in novel.Volumes)
+        {
+            foreach (var chapter in volume.Chapters)
+                _dbContext.Images.RemoveRange(chapter.Images);
+        }
 
-        // 4. Remove novel - cascades: chapters, localization keys, tag mappings
+        // 4. Remove novel - cascades: volumes, chapters, localization keys, tag mappings
         _dbContext.Novels.Remove(novel);
         await _dbContext.SaveChangesAsync();
     }

FictionArchive.Service.NovelService/Services/SourceAdapters/Novelpia/NovelpiaAdapter.cs

@@ -66,7 +66,7 @@ public class NovelpiaAdapter : ISourceAdapter
             ExternalId = novelId.ToString(),
             SystemTags = new List<string>(),
             SourceTags = new List<string>(),
-            Chapters = new List<ChapterMetadata>(),
+            Volumes = new List<VolumeMetadata>(),
             SourceDescriptor = SourceDescriptor
         };
         
@@ -133,6 +133,9 @@ public class NovelpiaAdapter : ISourceAdapter
             novel.SourceTags.Add(tag);
         }
 
+        // Author's posts (from notice_table in the page HTML)
+        var authorsPosts = ParseAuthorsPosts(novelData);
+
         // Chapters
         uint page = 0;
         List<ChapterMetadata> chapters = new List<ChapterMetadata>();
@@ -168,7 +171,25 @@ public class NovelpiaAdapter : ISourceAdapter
             }
             page++;
         }
-        novel.Chapters = chapters;
+
+        // Add Author's Posts volume if there are any
+        if (authorsPosts.Count > 0)
+        {
+            novel.Volumes.Add(new VolumeMetadata
+            {
+                Order = 0,
+                Name = "Author's Posts",
+                Chapters = authorsPosts
+            });
+        }
+
+        // Main Story volume
+        novel.Volumes.Add(new VolumeMetadata
+        {
+            Order = 1,
+            Name = "Main Story",
+            Chapters = chapters
+        });
 
         return novel;
     }
@@ -241,4 +262,40 @@ public class NovelpiaAdapter : ISourceAdapter
         }
         return await image.Content.ReadAsByteArrayAsync();
     }
+
+    private List<ChapterMetadata> ParseAuthorsPosts(string novelHtml)
+    {
+        var posts = new List<ChapterMetadata>();
+
+        // Find the notice_table section
+        var noticeTableMatch = Regex.Match(novelHtml,
+            @"(?s)<table[^>]*class=""notice_table[^""]*""[^>]*>(.*?)</table>");
+        if (!noticeTableMatch.Success)
+            return posts;
+
+        var tableContent = noticeTableMatch.Groups[1].Value;
+
+        // Find all td elements with onclick containing viewer URL and extract title from <b>
+        // HTML structure: <td ... onclick="...location='/viewer/3330612';"><b>Title</b>
+        var postMatches = Regex.Matches(tableContent,
+            @"onclick=""[^""]*location='/viewer/(\d+)'[^""]*""[^>]*><b>([^<]+)</b>");
+
+        uint order = 1;
+        foreach (Match match in postMatches)
+        {
+            string viewerId = match.Groups[1].Value;
+            string title = WebUtility.HtmlDecode(match.Groups[2].Value.Trim());
+
+            posts.Add(new ChapterMetadata
+            {
+                Revision = 0,
+                Order = order,
+                Url = $"https://novelpia.com/viewer/{viewerId}",
+                Name = title
+            });
+            order++;
+        }
+
+        return posts;
+    }
 }

FictionArchive.Service.NovelService/appsettings.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
     }
   },
   "Novelpia": {

FictionArchive.Service.SchedulerService/Models/JobTemplates/EventJobTemplate.cs

@@ -1,4 +1,4 @@
-using FictionArchive.Service.Shared.Services.EventBus;
+using MassTransit;
 using Newtonsoft.Json;
 using Quartz;
 
@@ -6,15 +6,15 @@ namespace FictionArchive.Service.SchedulerService.Models.JobTemplates;
 
 public class EventJobTemplate : IJob
 {
-    private readonly IEventBus _eventBus;
+    private readonly IBus _bus;
     private readonly ILogger<EventJobTemplate> _logger;
 
     public const string EventTypeParameter = "RoutingKey";
     public const string EventDataParameter = "MessageData";
 
-    public EventJobTemplate(IEventBus eventBus, ILogger<EventJobTemplate> logger)
+    public EventJobTemplate(IBus bus, ILogger<EventJobTemplate> logger)
     {
-        _eventBus = eventBus;
+        _bus = bus;
         _logger = logger;
     }
 
@@ -25,7 +25,7 @@ public class EventJobTemplate : IJob
             var eventData = context.MergedJobDataMap.GetString(EventDataParameter);
             var eventType = context.MergedJobDataMap.GetString(EventTypeParameter);
             var eventObject = JsonConvert.DeserializeObject(eventData);
-            await _eventBus.Publish(eventObject, eventType);
+            await _bus.Publish(eventObject);
         }
         catch (Exception ex)
         {

FictionArchive.Service.SchedulerService/Program.cs

@@ -2,7 +2,6 @@ using FictionArchive.Service.SchedulerService.GraphQL;
 using FictionArchive.Service.SchedulerService.Services;
 using FictionArchive.Service.Shared;
 using FictionArchive.Service.Shared.Extensions;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using Quartz;
 using Quartz.Impl.AdoJobStore;
 
@@ -38,10 +37,7 @@ public class Program
 
         if (!isSchemaExport)
         {
-            builder.Services.AddRabbitMQ(opt =>
-            {
-                builder.Configuration.GetSection("RabbitMQ").Bind(opt);
-            });
+            builder.Services.AddFictionArchiveMassTransit(builder.Configuration);
         }
 
         #endregion

FictionArchive.Service.SchedulerService/Services/JobManagerService.cs

@@ -1,7 +1,6 @@
 using System.Data;
 using FictionArchive.Service.SchedulerService.Models;
 using FictionArchive.Service.SchedulerService.Models.JobTemplates;
-using FictionArchive.Service.Shared.Services.EventBus;
 using Quartz;
 using Quartz.Impl.Matchers;
 

FictionArchive.Service.SchedulerService/appsettings.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
     }
   },
   "RabbitMQ": {

FictionArchive.Service.Shared/Contracts/Events/IChapterCreated.cs

@@ -0,0 +1,11 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IChapterCreated
+{
+    uint ChapterId { get; }
+    uint NovelId { get; }
+    uint VolumeId { get; }
+    uint VolumeOrder { get; }
+    uint ChapterOrder { get; }
+    string ChapterTitle { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/IChapterPullRequested.cs

@@ -0,0 +1,8 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IChapterPullRequested
+{
+    uint NovelId { get; }
+    uint VolumeId { get; }
+    uint ChapterOrder { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/IFileUploadRequestCreated.cs

@@ -0,0 +1,8 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IFileUploadRequestCreated
+{
+    Guid RequestId { get; }
+    string FilePath { get; }
+    byte[] FileData { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/IFileUploadRequestStatusUpdate.cs

@@ -0,0 +1,11 @@
+using FictionArchive.Common.Enums;
+
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IFileUploadRequestStatusUpdate
+{
+    Guid RequestId { get; }
+    RequestStatus Status { get; }
+    string? FileAccessUrl { get; }
+    string? ErrorMessage { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/INovelCreated.cs

@@ -0,0 +1,12 @@
+using FictionArchive.Common.Enums;
+
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface INovelCreated
+{
+    uint NovelId { get; }
+    string Title { get; }
+    Language OriginalLanguage { get; }
+    string Source { get; }
+    string AuthorName { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/INovelUpdateRequested.cs

@@ -0,0 +1,6 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface INovelUpdateRequested
+{
+    string NovelUrl { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/ITranslationRequestCompleted.cs

@@ -0,0 +1,7 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface ITranslationRequestCompleted
+{
+    Guid? TranslationRequestId { get; }
+    string? TranslatedText { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/ITranslationRequestCreated.cs

@@ -0,0 +1,12 @@
+using FictionArchive.Common.Enums;
+
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface ITranslationRequestCreated
+{
+    Guid TranslationRequestId { get; }
+    Language From { get; }
+    Language To { get; }
+    string Body { get; }
+    string TranslationEngineKey { get; }
+}

FictionArchive.Service.Shared/Contracts/Events/IUserInvited.cs

@@ -0,0 +1,12 @@
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IUserInvited
+{
+    string InvitedUserId { get; }
+    string InvitedUsername { get; }
+    string InvitedEmail { get; }
+    string InvitedOAuthProviderId { get; }
+    string InviterId { get; }
+    string InviterUsername { get; }
+    string InviterOAuthProviderId { get; }
+}

FictionArchive.Service.Shared/Extensions/MassTransitExtensions.cs

@@ -0,0 +1,118 @@
+using System.Text.RegularExpressions;
+using FictionArchive.Service.Shared.Services.Filters;
+using MassTransit;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace FictionArchive.Service.Shared.Extensions;
+
+public static class MassTransitExtensions
+{
+    public static IServiceCollection AddFictionArchiveMassTransit(
+        this IServiceCollection services,
+        IConfiguration configuration,
+        Action<IBusRegistrationConfigurator>? configureConsumers = null)
+    {
+        services.AddMassTransit(x =>
+        {
+            configureConsumers?.Invoke(x);
+
+            x.UsingRabbitMq((context, cfg) =>
+            {
+                var (host, username, password) = ParseRabbitMqConfiguration(configuration);
+
+                cfg.Host(host, h =>
+                {
+                    h.Username(username);
+                    h.Password(password);
+                });
+
+                cfg.UseMessageRetry(r => r.Exponential(
+                    retryLimit: 5,
+                    minInterval: TimeSpan.FromSeconds(1),
+                    maxInterval: TimeSpan.FromMinutes(1),
+                    intervalDelta: TimeSpan.FromSeconds(2)));
+
+                cfg.UseConsumeFilter(typeof(LoggingConsumeFilter<>), context);
+
+                // Process one message at a time per consumer (matches old EventBus behavior)
+                cfg.PrefetchCount = 1;
+
+                cfg.ConfigureEndpoints(context);
+            });
+        });
+
+        return services;
+    }
+
+    /// <summary>
+    /// Parses RabbitMQ configuration from either ConnectionString format or separate Host/Username/Password keys.
+    /// ConnectionString format: amqp://[username:password@]host[:port]
+    /// </summary>
+    private static (string Host, string Username, string Password) ParseRabbitMqConfiguration(IConfiguration configuration)
+    {
+        var connectionString = configuration["RabbitMQ:ConnectionString"];
+
+        if (!string.IsNullOrEmpty(connectionString))
+        {
+            return ParseConnectionString(connectionString);
+        }
+
+        // Fallback to separate configuration keys
+        var host = configuration["RabbitMQ:Host"] ?? "localhost";
+        var username = configuration["RabbitMQ:Username"] ?? "guest";
+        var password = configuration["RabbitMQ:Password"] ?? "guest";
+
+        return (host, username, password);
+    }
+
+    /// <summary>
+    /// Parses an AMQP connection string into host, username, and password components.
+    /// Supports formats:
+    /// - amqp://host
+    /// - amqp://host:port
+    /// - amqp://username:password@host
+    /// - amqp://username:password@host:port
+    /// </summary>
+    private static (string Host, string Username, string Password) ParseConnectionString(string connectionString)
+    {
+        var username = "guest";
+        var password = "guest";
+        var host = "localhost";
+
+        // Try to parse as URI first
+        if (Uri.TryCreate(connectionString, UriKind.Absolute, out var uri))
+        {
+            host = uri.Host;
+
+            if (!string.IsNullOrEmpty(uri.UserInfo))
+            {
+                var userInfoParts = uri.UserInfo.Split(':', 2);
+                username = Uri.UnescapeDataString(userInfoParts[0]);
+                if (userInfoParts.Length > 1)
+                {
+                    password = Uri.UnescapeDataString(userInfoParts[1]);
+                }
+            }
+        }
+        else
+        {
+            // Fallback regex parsing for edge cases
+            var match = Regex.Match(connectionString, @"amqp://(?:([^:]+):([^@]+)@)?([^:/]+)");
+            if (match.Success)
+            {
+                if (match.Groups[1].Success && match.Groups[2].Success)
+                {
+                    username = match.Groups[1].Value;
+                    password = match.Groups[2].Value;
+                }
+                if (match.Groups[3].Success)
+                {
+                    host = match.Groups[3].Value;
+                }
+            }
+        }
+
+        return (host, username, password);
+    }
+}

FictionArchive.Service.Shared/FictionArchive.Service.Shared.csproj

@@ -31,7 +31,7 @@
         <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
         <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.NodaTime" Version="9.0.4" />
         <PackageReference Include="Polly" Version="8.6.5" />
-        <PackageReference Include="RabbitMQ.Client" Version="7.2.0" />
+        <PackageReference Include="MassTransit.RabbitMQ" Version="8.*" />
         <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.11" />
     </ItemGroup>
     

FictionArchive.Service.Shared/Services/EventBus/EventBusBuilder.cs

@@ -1,25 +0,0 @@
-using Microsoft.Extensions.DependencyInjection;
-
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public class EventBusBuilder<TEventBus> where TEventBus : class, IEventBus
-{
-    private readonly IServiceCollection _services;
-    private readonly SubscriptionManager _subscriptionManager;
-
-    public EventBusBuilder(IServiceCollection services)
-    {
-        _services = services;
-        _services.AddSingleton<IEventBus, TEventBus>();
-        
-        _subscriptionManager = new SubscriptionManager();
-        _services.AddSingleton<SubscriptionManager>(_subscriptionManager);
-    }
-
-    public EventBusBuilder<TEventBus> Subscribe<TEvent, TEventHandler>() where TEvent : IIntegrationEvent where TEventHandler : class, IIntegrationEventHandler<TEvent>
-    {
-        _services.AddKeyedTransient<IIntegrationEventHandler, TEventHandler>(typeof(TEvent).Name);
-        _subscriptionManager.RegisterSubscription<TEvent>();
-        return this;
-    }
-}

FictionArchive.Service.Shared/Services/EventBus/EventBusExtensions.cs

@@ -1,12 +0,0 @@
-using Microsoft.Extensions.DependencyInjection;
-
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public static class EventBusExtensions
-{
-    public static EventBusBuilder<TEventBus> AddEventBus<TEventBus>(this IServiceCollection services)
-        where TEventBus : class, IEventBus
-    {
-        return new EventBusBuilder<TEventBus>(services);
-    }
-}

FictionArchive.Service.Shared/Services/EventBus/IEventBus.cs

@@ -1,7 +0,0 @@
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public interface IEventBus
-{
-    Task Publish<TEvent>(TEvent integrationEvent) where TEvent : IIntegrationEvent;
-    Task Publish(object integrationEvent, string eventType);
-}

FictionArchive.Service.Shared/Services/EventBus/IIntegrationEvent.cs

@@ -1,7 +0,0 @@
-using NodaTime;
-
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public interface IIntegrationEvent
-{
-}

FictionArchive.Service.Shared/Services/EventBus/IIntegrationEventHandler.cs

@@ -1,12 +0,0 @@
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public interface IIntegrationEventHandler<in TEvent> : IIntegrationEventHandler where TEvent : IIntegrationEvent
-{
-    Task Handle(TEvent @event);
-    Task IIntegrationEventHandler.Handle(IIntegrationEvent @event) => Handle((TEvent)@event);
-}
-
-public interface IIntegrationEventHandler
-{
-    Task Handle(IIntegrationEvent @event);
-}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQConnectionProvider.cs

@@ -1,35 +0,0 @@
-using RabbitMQ.Client;
-
-namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
-
-public class RabbitMQConnectionProvider
-{
-    private readonly IConnectionFactory _connectionFactory;
-
-    private IConnection Connection { get; set; }
-    private IChannel DefaultChannel { get; set; }
-
-    public RabbitMQConnectionProvider(IConnectionFactory connectionFactory)
-    {
-        _connectionFactory = connectionFactory;
-    }
-
-    public async Task<IConnection> GetConnectionAsync()
-    {
-        if (Connection == null)
-        {
-            Connection = await _connectionFactory.CreateConnectionAsync();
-        }
-
-        return Connection;
-    }
-    
-    public async Task<IChannel> GetDefaultChannelAsync()
-    {
-        if (DefaultChannel == null)
-        {
-            DefaultChannel = await (await GetConnectionAsync()).CreateChannelAsync();
-        }
-        return DefaultChannel;
-    }
-}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQEventBus.cs

@@ -1,137 +0,0 @@
-using System.Text;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Options;
-using Newtonsoft.Json;
-using NodaTime;
-using NodaTime.Serialization.JsonNet;
-using RabbitMQ.Client;
-using RabbitMQ.Client.Events;
-
-namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
-
-public class RabbitMQEventBus : IEventBus, IHostedService
-{
-    private readonly IServiceScopeFactory _serviceScopeFactory;
-    private readonly RabbitMQConnectionProvider _connectionProvider;
-    private readonly RabbitMQOptions _options;
-    private readonly SubscriptionManager _subscriptionManager;
-    private readonly ILogger<RabbitMQEventBus> _logger;
-    
-    private readonly JsonSerializerSettings _jsonSerializerSettings;
-
-    private const string ExchangeName = "fiction-archive-event-bus";
-    private const string CreatedAtHeader = "X-Created-At";
-    private const string EventIdHeader = "X-Event-Id";
-
-    public RabbitMQEventBus(IServiceScopeFactory serviceScopeFactory, RabbitMQConnectionProvider connectionProvider, IOptions<RabbitMQOptions> options, SubscriptionManager subscriptionManager, ILogger<RabbitMQEventBus> logger)
-    {
-        _serviceScopeFactory = serviceScopeFactory;
-        _connectionProvider = connectionProvider;
-        _subscriptionManager = subscriptionManager;
-        _logger = logger;
-        _options = options.Value;
-        _jsonSerializerSettings = new JsonSerializerSettings().ConfigureForNodaTime(DateTimeZoneProviders.Tzdb);
-    }
-
-    public async Task Publish<TEvent>(TEvent integrationEvent) where TEvent : IIntegrationEvent
-    {
-        var routingKey = typeof(TEvent).Name;
-        
-        await Publish(integrationEvent, routingKey);
-    }
-
-    public async Task Publish(object integrationEvent, string eventType)
-    {
-        var channel = await _connectionProvider.GetDefaultChannelAsync();
-        var body = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(integrationEvent));
-        
-        // headers
-        var props = new BasicProperties();
-        props.Headers = new Dictionary<string, object?>()
-        {
-            { CreatedAtHeader, Instant.FromDateTimeUtc(DateTime.UtcNow).ToString() },
-            { EventIdHeader, Guid.NewGuid().ToString() }
-        };
-        
-        await channel.BasicPublishAsync(ExchangeName, eventType, true, props, body);
-        _logger.LogInformation("Published event {EventName}", eventType);
-    }
-
-    public async Task StartAsync(CancellationToken cancellationToken)
-    {
-        _ = Task.Factory.StartNew(async () =>
-        {
-            try
-            {
-                var channel = await _connectionProvider.GetDefaultChannelAsync();
-                await channel.ExchangeDeclareAsync(ExchangeName, ExchangeType.Direct,
-                    cancellationToken: cancellationToken);
-
-                await channel.BasicQosAsync(prefetchSize: 0, prefetchCount: 1, global: false, cancellationToken: cancellationToken);
-                await channel.QueueDeclareAsync(_options.ClientIdentifier, true, false, false,
-                    cancellationToken: cancellationToken);
-                var consumer = new AsyncEventingBasicConsumer(channel);
-                consumer.ReceivedAsync += (sender, @event) =>
-                {
-                    return OnReceivedEvent(sender, @event, channel);
-                };
-                
-                await channel.BasicConsumeAsync(_options.ClientIdentifier, false, consumer, cancellationToken: cancellationToken);
-                
-                foreach (var subscription in _subscriptionManager.Subscriptions)
-                {
-                    await channel.QueueBindAsync(_options.ClientIdentifier, ExchangeName, subscription.Key,
-                        cancellationToken: cancellationToken);
-                    _logger.LogInformation("Subscribed to {SubscriptionKey}", subscription.Key);
-                }
-
-                _logger.LogInformation("RabbitMQ EventBus started.");
-            }
-            catch (Exception e)
-            {
-                _logger.LogError(e, "An error occurred while starting the RabbitMQ EventBus");
-            }
-        }, cancellationToken);
-    }
-
-    public Task StopAsync(CancellationToken cancellationToken)
-    {
-        return Task.CompletedTask;
-    }
-    
-    private async Task OnReceivedEvent(object sender, BasicDeliverEventArgs @event, IChannel channel)
-    {
-        var eventName = @event.RoutingKey;
-        _logger.LogInformation("Received event {EventName}", eventName);
-        try
-        {
-            if (!_subscriptionManager.Subscriptions.ContainsKey(eventName))
-            {
-                _logger.LogWarning("Received event without subscription entry.");
-                return;
-            }
-            
-            var eventBody = Encoding.UTF8.GetString(@event.Body.Span);
-            var eventObject = JsonConvert.DeserializeObject(eventBody, _subscriptionManager.Subscriptions[eventName], _jsonSerializerSettings) as IIntegrationEvent;
-            
-            using var scope = _serviceScopeFactory.CreateScope();
-
-            foreach (var service in scope.ServiceProvider.GetKeyedServices<IIntegrationEventHandler>(eventName))
-            {
-                await service.Handle(eventObject);
-            }
-            _logger.LogInformation("Finished handling event with name {EventName}", eventName);
-        }
-        catch (Exception e)
-        {
-            _logger.LogError(e, "An error occurred while handling an event.");
-        }
-        finally
-        {
-            await channel.BasicAckAsync(@event.DeliveryTag, false);
-        }
-
-    }
-}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQExtensions.cs

@@ -1,24 +0,0 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-using RabbitMQ.Client;
-
-namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
-
-public static class RabbitMQExtensions
-{
-    public static EventBusBuilder<RabbitMQEventBus> AddRabbitMQ(this IServiceCollection services, Action<RabbitMQOptions> configure)
-    {
-        services.Configure(configure);
-        services.AddSingleton<IConnectionFactory, ConnectionFactory>(provider =>
-        {
-            var options = provider.GetService<IOptions<RabbitMQOptions>>();
-            ConnectionFactory factory = new ConnectionFactory();
-            factory.Uri = new Uri(options.Value.ConnectionString);
-            return factory;
-        });
-        services.AddSingleton<RabbitMQConnectionProvider>();
-        services.AddHostedService<RabbitMQEventBus>();
-        return services.AddEventBus<RabbitMQEventBus>();
-    }
-}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQOptions.cs

@@ -1,7 +0,0 @@
-namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
-
-public class RabbitMQOptions
-{
-    public string ConnectionString { get; set; }
-    public string ClientIdentifier { get; set; }
-}

FictionArchive.Service.Shared/Services/EventBus/SubscriptionManager.cs

@@ -1,11 +0,0 @@
-namespace FictionArchive.Service.Shared.Services.EventBus;
-
-public class SubscriptionManager
-{
-    public Dictionary<string, Type> Subscriptions { get; } = new Dictionary<string, Type>();
-
-    public void RegisterSubscription<TEvent>()
-    {
-        Subscriptions.Add(typeof(TEvent).Name, typeof(TEvent));
-    }
-}

FictionArchive.Service.Shared/Services/Filters/LoggingConsumeFilter.cs

@@ -0,0 +1,33 @@
+using MassTransit;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.Shared.Services.Filters;
+
+public class LoggingConsumeFilter<T> : IFilter<ConsumeContext<T>> where T : class
+{
+    private readonly ILogger<LoggingConsumeFilter<T>> _logger;
+
+    public LoggingConsumeFilter(ILogger<LoggingConsumeFilter<T>> logger)
+    {
+        _logger = logger;
+    }
+
+    public async Task Send(ConsumeContext<T> context, IPipe<ConsumeContext<T>> next)
+    {
+        try
+        {
+            await next.Send(context);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex,
+                "Message {MessageType} failed after all retries. MessageId: {MessageId}, ConversationId: {ConversationId}",
+                typeof(T).Name,
+                context.MessageId,
+                context.ConversationId);
+            throw;
+        }
+    }
+
+    public void Probe(ProbeContext context) => context.CreateFilterScope("logging");
+}

FictionArchive.Service.TranslationService/Consumers/TranslationRequestCreatedConsumer.cs

@@ -0,0 +1,53 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+using FictionArchive.Service.TranslationService.Contracts;
+using FictionArchive.Service.TranslationService.Models.Enums;
+using FictionArchive.Service.TranslationService.Services;
+using MassTransit;
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.TranslationService.Consumers;
+
+public class TranslationRequestCreatedConsumer : IConsumer<ITranslationRequestCreated>
+{
+    private readonly ILogger<TranslationRequestCreatedConsumer> _logger;
+    private readonly TranslationEngineService _translationEngineService;
+    private readonly IPublishEndpoint _publishEndpoint;
+
+    public TranslationRequestCreatedConsumer(
+        ILogger<TranslationRequestCreatedConsumer> logger,
+        TranslationEngineService translationEngineService,
+        IPublishEndpoint publishEndpoint)
+    {
+        _logger = logger;
+        _translationEngineService = translationEngineService;
+        _publishEndpoint = publishEndpoint;
+    }
+
+    public async Task Consume(ConsumeContext<ITranslationRequestCreated> context)
+    {
+        var message = context.Message;
+
+        _logger.LogInformation("Processing translation request {TranslationRequestId}", message.TranslationRequestId);
+
+        var result = await _translationEngineService.Translate(
+            message.From,
+            message.To,
+            message.Body,
+            message.TranslationEngineKey);
+
+        if (result.Status == TranslationRequestStatus.Success)
+        {
+            await _publishEndpoint.Publish<ITranslationRequestCompleted>(
+                new TranslationRequestCompleted(
+                    TranslationRequestId: message.TranslationRequestId,
+                    TranslatedText: result.TranslatedText));
+
+            _logger.LogInformation("Translation completed for request {TranslationRequestId}", message.TranslationRequestId);
+        }
+        else
+        {
+            _logger.LogError("Translation failed for request {TranslationRequestId}", message.TranslationRequestId);
+            throw new InvalidOperationException($"Translation failed for request {message.TranslationRequestId}");
+        }
+    }
+}

FictionArchive.Service.TranslationService/Contracts/TranslationRequestCompleted.cs

@@ -0,0 +1,7 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+
+namespace FictionArchive.Service.TranslationService.Contracts;
+
+public record TranslationRequestCompleted(
+    Guid? TranslationRequestId,
+    string? TranslatedText) : ITranslationRequestCompleted;

FictionArchive.Service.TranslationService/Models/IntegrationEvents/TranslationRequestCompletedEvent.cs

@@ -1,18 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-using FictionArchive.Service.TranslationService.Models.Enums;
-
-namespace FictionArchive.Service.TranslationService.Models.IntegrationEvents;
-
-public class TranslationRequestCompletedEvent : IIntegrationEvent
-{
-    /// <summary>
-    /// Maps this event back to a triggering request.
-    /// </summary>
-    public Guid? TranslationRequestId { get; set; }
-    
-    /// <summary>
-    /// The resulting text.
-    /// </summary>
-    public string? TranslatedText { get; set; }
-}

FictionArchive.Service.TranslationService/Models/IntegrationEvents/TranslationRequestCreatedEvent.cs

@@ -1,13 +0,0 @@
-using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-
-namespace FictionArchive.Service.TranslationService.Models.IntegrationEvents;
-
-public class TranslationRequestCreatedEvent : IIntegrationEvent
-{
-    public Guid TranslationRequestId { get; set; }
-    public Language From { get; set; }
-    public Language To { get; set; }
-    public string Body { get; set; }
-    public string TranslationEngineKey { get; set; }
-}

FictionArchive.Service.TranslationService/Program.cs

@@ -2,16 +2,13 @@ using DeepL;
 using FictionArchive.Common.Extensions;
 using FictionArchive.Service.Shared;
 using FictionArchive.Service.Shared.Extensions;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using FictionArchive.Service.Shared.Services.GraphQL;
+using FictionArchive.Service.TranslationService.Consumers;
 using FictionArchive.Service.TranslationService.GraphQL;
-using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
 using FictionArchive.Service.TranslationService.Services;
 using FictionArchive.Service.TranslationService.Services.Database;
-using FictionArchive.Service.TranslationService.Services.EventHandlers;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines.DeepLTranslate;
-using RabbitMQ.Client;
 
 namespace FictionArchive.Service.TranslationService;
 
@@ -26,15 +23,16 @@ public class Program
 
         builder.Services.AddHealthChecks();
         
-        #region Event Bus
+        #region MassTransit
 
         if (!isSchemaExport)
         {
-            builder.Services.AddRabbitMQ(opt =>
-            {
-                builder.Configuration.GetSection("RabbitMQ").Bind(opt);
-            })
-            .Subscribe<TranslationRequestCreatedEvent, TranslationRequestCreatedEventHandler>();
+            builder.Services.AddFictionArchiveMassTransit(
+                builder.Configuration,
+                x =>
+                {
+                    x.AddConsumer<TranslationRequestCreatedConsumer>();
+                });
         }
 
         #endregion

FictionArchive.Service.TranslationService/Services/EventHandlers/TranslationRequestCreatedEventHandler.cs

@@ -1,31 +0,0 @@
-using FictionArchive.Service.Shared.Services.EventBus;
-using FictionArchive.Service.TranslationService.Models.Enums;
-using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
-
-namespace FictionArchive.Service.TranslationService.Services.EventHandlers;
-
-public class TranslationRequestCreatedEventHandler : IIntegrationEventHandler<TranslationRequestCreatedEvent>
-{
-    private readonly ILogger<TranslationRequestCreatedEventHandler> _logger;
-    private readonly TranslationEngineService _translationEngineService;
-    private readonly IEventBus _eventBus;
-
-    public TranslationRequestCreatedEventHandler(ILogger<TranslationRequestCreatedEventHandler> logger, TranslationEngineService translationEngineService)
-    {
-        _logger = logger;
-        _translationEngineService = translationEngineService;
-    }
-
-    public async Task Handle(TranslationRequestCreatedEvent @event)
-    {
-        var result = await _translationEngineService.Translate(@event.From, @event.To, @event.Body, @event.TranslationEngineKey);
-        if (result.Status == TranslationRequestStatus.Success)
-        {
-            await _eventBus.Publish(new TranslationRequestCompletedEvent()
-            {
-                TranslatedText = result.TranslatedText,
-                TranslationRequestId = @event.TranslationRequestId,
-            });
-        }
-    }
-}

FictionArchive.Service.TranslationService/Services/TranslationEngineService.cs

@@ -1,28 +1,21 @@
-using System.Text;
 using FictionArchive.Common.Enums;
-using FictionArchive.Service.Shared.Services.EventBus;
-using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using FictionArchive.Service.TranslationService.Models;
 using FictionArchive.Service.TranslationService.Models.Database;
 using FictionArchive.Service.TranslationService.Models.Enums;
-using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
 using FictionArchive.Service.TranslationService.Services.Database;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines;
-using RabbitMQ.Client;
 
 namespace FictionArchive.Service.TranslationService.Services;
 
 public class TranslationEngineService
 {
     private readonly IEnumerable<ITranslationEngine> _translationEngines;
-    private readonly IEventBus _eventBus;
     private readonly TranslationServiceDbContext _dbContext;
 
-    public TranslationEngineService(IEnumerable<ITranslationEngine> translationEngines, TranslationServiceDbContext dbContext, IEventBus eventBus)
+    public TranslationEngineService(IEnumerable<ITranslationEngine> translationEngines, TranslationServiceDbContext dbContext)
     {
         _translationEngines = translationEngines;
         _dbContext = dbContext;
-        _eventBus = eventBus;
     }
 
     public async Task<TranslationResult> Translate(Language from, Language to, string text, string translationEngineKey)

FictionArchive.Service.TranslationService/appsettings.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
     }
   },
   "DeepL": {

FictionArchive.Service.UserNovelDataService/Consumers/ChapterCreatedConsumer.cs

@@ -0,0 +1,56 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+using FictionArchive.Service.UserNovelDataService.Models.Database;
+using FictionArchive.Service.UserNovelDataService.Services;
+using MassTransit;
+using Microsoft.EntityFrameworkCore;
+
+namespace FictionArchive.Service.UserNovelDataService.Consumers;
+
+public class ChapterCreatedConsumer : IConsumer<IChapterCreated>
+{
+    private readonly ILogger<ChapterCreatedConsumer> _logger;
+    private readonly UserNovelDataServiceDbContext _dbContext;
+
+    public ChapterCreatedConsumer(
+        ILogger<ChapterCreatedConsumer> logger,
+        UserNovelDataServiceDbContext dbContext)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    public async Task Consume(ConsumeContext<IChapterCreated> context)
+    {
+        var message = context.Message;
+
+        // Ensure novel exists
+        var novelExists = await _dbContext.Novels.AnyAsync(n => n.Id == message.NovelId);
+        if (!novelExists)
+        {
+            var novel = new Novel { Id = message.NovelId };
+            _dbContext.Novels.Add(novel);
+        }
+
+        // Ensure volume exists
+        var volumeExists = await _dbContext.Volumes.AnyAsync(v => v.Id == message.VolumeId);
+        if (!volumeExists)
+        {
+            var volume = new Volume { Id = message.VolumeId };
+            _dbContext.Volumes.Add(volume);
+        }
+
+        // Create chapter if not exists
+        var chapterExists = await _dbContext.Chapters.AnyAsync(c => c.Id == message.ChapterId);
+        if (chapterExists)
+        {
+            _logger.LogDebug("Chapter {ChapterId} already exists, skipping", message.ChapterId);
+            return;
+        }
+
+        var chapter = new Chapter { Id = message.ChapterId };
+        _dbContext.Chapters.Add(chapter);
+        await _dbContext.SaveChangesAsync();
+
+        _logger.LogInformation("Created chapter stub for {ChapterId} in novel {NovelId}", message.ChapterId, message.NovelId);
+    }
+}

FictionArchive.Service.UserNovelDataService/Consumers/NovelCreatedConsumer.cs

@@ -0,0 +1,39 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+using FictionArchive.Service.UserNovelDataService.Models.Database;
+using FictionArchive.Service.UserNovelDataService.Services;
+using MassTransit;
+using Microsoft.EntityFrameworkCore;
+
+namespace FictionArchive.Service.UserNovelDataService.Consumers;
+
+public class NovelCreatedConsumer : IConsumer<INovelCreated>
+{
+    private readonly ILogger<NovelCreatedConsumer> _logger;
+    private readonly UserNovelDataServiceDbContext _dbContext;
+
+    public NovelCreatedConsumer(
+        ILogger<NovelCreatedConsumer> logger,
+        UserNovelDataServiceDbContext dbContext)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    public async Task Consume(ConsumeContext<INovelCreated> context)
+    {
+        var message = context.Message;
+
+        var exists = await _dbContext.Novels.AnyAsync(n => n.Id == message.NovelId);
+        if (exists)
+        {
+            _logger.LogDebug("Novel {NovelId} already exists, skipping", message.NovelId);
+            return;
+        }
+
+        var novel = new Novel { Id = message.NovelId };
+        _dbContext.Novels.Add(novel);
+        await _dbContext.SaveChangesAsync();
+
+        _logger.LogInformation("Created novel stub for {NovelId}", message.NovelId);
+    }
+}

FictionArchive.Service.UserNovelDataService/Consumers/UserInvitedConsumer.cs

@@ -0,0 +1,44 @@
+using FictionArchive.Service.Shared.Contracts.Events;
+using FictionArchive.Service.UserNovelDataService.Models.Database;
+using FictionArchive.Service.UserNovelDataService.Services;
+using MassTransit;
+using Microsoft.EntityFrameworkCore;
+
+namespace FictionArchive.Service.UserNovelDataService.Consumers;
+
+public class UserInvitedConsumer : IConsumer<IUserInvited>
+{
+    private readonly ILogger<UserInvitedConsumer> _logger;
+    private readonly UserNovelDataServiceDbContext _dbContext;
+
+    public UserInvitedConsumer(
+        ILogger<UserInvitedConsumer> logger,
+        UserNovelDataServiceDbContext dbContext)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    public async Task Consume(ConsumeContext<IUserInvited> context)
+    {
+        var message = context.Message;
+
+        var userId = Guid.Parse(message.InvitedUserId);
+        var exists = await _dbContext.Users.AnyAsync(u => u.Id == userId);
+        if (exists)
+        {
+            _logger.LogDebug("User {UserId} already exists, skipping", message.InvitedUserId);
+            return;
+        }
+
+        var user = new User
+        {
+            Id = userId,
+            OAuthProviderId = message.InvitedOAuthProviderId
+        };
+        _dbContext.Users.Add(user);
+        await _dbContext.SaveChangesAsync();
+
+        _logger.LogInformation("Created user stub for {UserId}", message.InvitedUserId);
+    }
+}

FictionArchive.Service.UserNovelDataService/FictionArchive.Service.UserNovelDataService.csproj

@@ -7,6 +7,13 @@
         <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
     </PropertyGroup>
 
+    <ItemGroup>
+        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.11">
+          <PrivateAssets>all</PrivateAssets>
+          <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
+    </ItemGroup>
+
     <ItemGroup>
       <Content Include="..\.dockerignore">
         <Link>.dockerignore</Link>

FictionArchive.Service.UserNovelDataService/GraphQL/Mutation.cs

@@ -1,6 +1,498 @@
+using System.Security.Claims;
+using FictionArchive.Service.UserNovelDataService.Models.Database;
+using FictionArchive.Service.UserNovelDataService.Models.DTOs;
+using FictionArchive.Service.UserNovelDataService.Services;
+using HotChocolate.Authorization;
+using HotChocolate.Types;
+using Microsoft.EntityFrameworkCore;
+
 namespace FictionArchive.Service.UserNovelDataService.GraphQL;
 
 public class Mutation
 {
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<BookmarkPayload> UpsertBookmark(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        UpsertBookmarkInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
 
+        var user = await dbContext.Users
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            // Auto-create user if not exists
+            user = new User { OAuthProviderId = oAuthProviderId };
+            dbContext.Users.Add(user);
+            await dbContext.SaveChangesAsync();
+        }
+
+        var existingBookmark = await dbContext.Bookmarks
+            .FirstOrDefaultAsync(b => b.UserId == user.Id && b.ChapterId == input.ChapterId);
+
+        if (existingBookmark != null)
+        {
+            // Update existing
+            existingBookmark.Description = input.Description;
+        }
+        else
+        {
+            // Create new
+            existingBookmark = new Bookmark
+            {
+                UserId = user.Id,
+                NovelId = input.NovelId,
+                ChapterId = input.ChapterId,
+                Description = input.Description
+            };
+            dbContext.Bookmarks.Add(existingBookmark);
+        }
+
+        await dbContext.SaveChangesAsync();
+
+        return new BookmarkPayload
+        {
+            Success = true,
+            Bookmark = new BookmarkDto
+            {
+                Id = existingBookmark.Id,
+                ChapterId = existingBookmark.ChapterId,
+                NovelId = existingBookmark.NovelId,
+                Description = existingBookmark.Description,
+                CreatedTime = existingBookmark.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<BookmarkPayload> RemoveBookmark(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        uint chapterId)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new BookmarkPayload { Success = false };
+        }
+
+        var bookmark = await dbContext.Bookmarks
+            .FirstOrDefaultAsync(b => b.UserId == user.Id && b.ChapterId == chapterId);
+
+        if (bookmark == null)
+        {
+            return new BookmarkPayload { Success = false };
+        }
+
+        dbContext.Bookmarks.Remove(bookmark);
+        await dbContext.SaveChangesAsync();
+
+        return new BookmarkPayload { Success = true };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> CreateReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        CreateReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        if (string.IsNullOrWhiteSpace(input.Name))
+        {
+            throw new InvalidOperationException("Reading list name is required");
+        }
+
+        var user = await dbContext.Users
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            user = new User { OAuthProviderId = oAuthProviderId };
+            dbContext.Users.Add(user);
+            await dbContext.SaveChangesAsync();
+        }
+
+        var readingList = new ReadingList
+        {
+            UserId = user.Id,
+            Name = input.Name.Trim(),
+            Description = input.Description?.Trim()
+        };
+
+        dbContext.ReadingLists.Add(readingList);
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = [],
+                ItemCount = 0,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> UpdateReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        UpdateReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        if (string.IsNullOrWhiteSpace(input.Name))
+        {
+            throw new InvalidOperationException("Reading list name is required");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.Id && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        readingList.Name = input.Name.Trim();
+        readingList.Description = input.Description?.Trim();
+
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<DeleteReadingListPayload> DeleteReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        int id)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new DeleteReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .FirstOrDefaultAsync(r => r.Id == id && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new DeleteReadingListPayload { Success = false };
+        }
+
+        dbContext.ReadingLists.Remove(readingList);
+        await dbContext.SaveChangesAsync();
+
+        return new DeleteReadingListPayload { Success = true };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> AddToReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        AddToReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.ReadingListId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        // Idempotent: if already in list, return success
+        var existingItem = readingList.Items.FirstOrDefault(i => i.NovelId == input.NovelId);
+        if (existingItem != null)
+        {
+            return new ReadingListPayload
+            {
+                Success = true,
+                ReadingList = new ReadingListDto
+                {
+                    Id = readingList.Id,
+                    Name = readingList.Name,
+                    Description = readingList.Description,
+                    Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                    {
+                        NovelId = i.NovelId,
+                        Order = i.Order,
+                        AddedTime = i.CreatedTime
+                    }),
+                    ItemCount = readingList.Items.Count,
+                    CreatedTime = readingList.CreatedTime
+                }
+            };
+        }
+
+        // Add at the end (highest order + 1)
+        var maxOrder = readingList.Items.Any() ? readingList.Items.Max(i => i.Order) : -1;
+        var newItem = new ReadingListItem
+        {
+            ReadingListId = readingList.Id,
+            NovelId = input.NovelId,
+            Order = maxOrder + 1
+        };
+
+        dbContext.ReadingListItems.Add(newItem);
+        await dbContext.SaveChangesAsync();
+
+        // Reload to get updated items
+        readingList = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items.OrderBy(i => i.Order))
+            .FirstAsync(r => r.Id == input.ReadingListId);
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> RemoveFromReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        int listId,
+        uint novelId)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == listId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var item = readingList.Items.FirstOrDefault(i => i.NovelId == novelId);
+        if (item != null)
+        {
+            dbContext.ReadingListItems.Remove(item);
+            await dbContext.SaveChangesAsync();
+        }
+
+        // Reload to get updated items
+        readingList = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items.OrderBy(i => i.Order))
+            .FirstAsync(r => r.Id == listId);
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> ReorderReadingListItem(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        ReorderReadingListItemInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.ReadingListId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var item = readingList.Items.FirstOrDefault(i => i.NovelId == input.NovelId);
+        if (item == null)
+        {
+            throw new InvalidOperationException("Novel not found in reading list");
+        }
+
+        var oldOrder = item.Order;
+        var newOrder = input.NewOrder;
+
+        // Shift other items
+        if (newOrder < oldOrder)
+        {
+            // Moving up: shift items between newOrder and oldOrder down
+            foreach (var i in readingList.Items.Where(x => x.Order >= newOrder && x.Order < oldOrder))
+            {
+                i.Order++;
+            }
+        }
+        else if (newOrder > oldOrder)
+        {
+            // Moving down: shift items between oldOrder and newOrder up
+            foreach (var i in readingList.Items.Where(x => x.Order > oldOrder && x.Order <= newOrder))
+            {
+                i.Order--;
+            }
+        }
+
+        item.Order = newOrder;
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
 }

FictionArchive.Service.UserNovelDataService/GraphQL/Query.cs

@@ -1,6 +1,136 @@
+using System.Security.Claims;
+using FictionArchive.Service.UserNovelDataService.Models.Database;
+using FictionArchive.Service.UserNovelDataService.Models.DTOs;
+using FictionArchive.Service.UserNovelDataService.Services;
+using HotChocolate.Authorization;
+using Microsoft.EntityFrameworkCore;
+
 namespace FictionArchive.Service.UserNovelDataService.GraphQL;
 
 public class Query
 {
+    [Authorize]
+    public async Task<IQueryable<BookmarkDto>> GetBookmarks(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        uint novelId)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            return new List<BookmarkDto>().AsQueryable();
+        }
 
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new List<BookmarkDto>().AsQueryable();
+        }
+
+        return dbContext.Bookmarks
+            .AsNoTracking()
+            .Where(b => b.UserId == user.Id && b.NovelId == novelId)
+            .OrderByDescending(b => b.CreatedTime)
+            .Select(b => new BookmarkDto
+            {
+                Id = b.Id,
+                ChapterId = b.ChapterId,
+                NovelId = b.NovelId,
+                Description = b.Description,
+                CreatedTime = b.CreatedTime
+            });
+    }
+
+    [Authorize]
+    public async Task<IEnumerable<ReadingListDto>> GetReadingLists(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            return [];
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return [];
+        }
+
+        var lists = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items)
+            .Where(r => r.UserId == user.Id)
+            .OrderByDescending(r => r.LastUpdatedTime)
+            .ToListAsync();
+
+        return lists.Select(r => new ReadingListDto
+        {
+            Id = r.Id,
+            Name = r.Name,
+            Description = r.Description,
+            ItemCount = r.Items.Count,
+            Items = r.Items.Select(i => new ReadingListItemDto
+            {
+                NovelId = i.NovelId,
+                Order = i.Order,
+                AddedTime = i.CreatedTime
+            }),
+            CreatedTime = r.CreatedTime
+        });
+    }
+
+    [Authorize]
+    public async Task<ReadingListDto?> GetReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        int id)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            return null;
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return null;
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items.OrderBy(i => i.Order))
+            .FirstOrDefaultAsync(r => r.Id == id && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return null;
+        }
+
+        return new ReadingListDto
+        {
+            Id = readingList.Id,
+            Name = readingList.Name,
+            Description = readingList.Description,
+            ItemCount = readingList.Items.Count,
+            Items = readingList.Items.Select(i => new ReadingListItemDto
+            {
+                NovelId = i.NovelId,
+                Order = i.Order,
+                AddedTime = i.CreatedTime
+            }),
+            CreatedTime = readingList.CreatedTime
+        };
+    }
 }