mjasin ce4687ee93 fix: resolve PR #76 review recommendations
- Add ILogger<GetContextualRecommendationsQueryHandler> with structured logging
- Guard empty embedding text in VectorSearchStore (return empty vector, skip search)
- Benchmark vector search and embedding latency with Stopwatch (LogDebug/LogInfo)
- Refine EnsureCollectionExistsAsync: log creation events and non-fatal errors
- Replace all Console.WriteLine with ILogger in UI components (AiAssistantBubble,
  AiResponseRenderer, IntelligenceToolbar, SelectionAiPanel, Catalog, Intelligence, MyBooks)
- Create IRecommendationService abstraction + RecommendationService WASM implementation
- Register IRecommendationService in Web.Client DI
- Add ContextualRecommendationsWidget component with loading spinner and design tokens
- Add ContextualRecommendationsWidget to Dashboard.razor
- Update test constructor with ILogger mock for GetContextualRecommendationsQueryHandler

Closes review items: 2, 3, 4, 5, 6, 7, 8, 9, 10
Item 1 (unit tests) was already completed in previous session
2026-06-06 14:54:44 +02:00
2026-05-25 14:02:56 +02:00

📖 Nexus Reader

Nexus Reader is a state-of-the-art, cross-platform Blazor .NET 10 immersive e-book reader, powered by Native AOT, Clean Architecture, CQRS, and interactive D3.js Relationship Graphs built on vector-based AI semantics.


Features & Architecture Highlights

📁 Ingestion & Description persistence

  • Extracted and persistent book descriptions from EPUB package metadata during book ingestion.
  • The Description field propagates cleanly from the Ebook entity through Mapster to LastReadBookDto and UserProfileDto.
  • Implemented deep-link route activation: /reader/{bookId}?chapter=N.
  • Allows instant resume of reading session coordinates and loads the specific chapter chapter directly via URL query parameters.

🛡️ Downstream AI Resilience

  • Standard resilience engine in DependencyInjection.cs utilizing the Polly package (ai-retry).
  • Automatically intercepts, handles, and retries on both rate-limits (429 Too Many Requests) and downstream capacity overloads (503 ServiceUnavailable / high demand).

⚙️ Concurrent Request Deduplication

  • Multi-client InteractiveAuto Blazor circuit synchronization is backed by a thread-safe active task registry in KnowledgeService which ensures that identical concurrent requests await a single shared task instance, eliminating redundant LLM queries.

🛠️ Build & Verification Gate

Ensure the dotnet workload matches the active SDK, and compile the full solution utilizing:

dotnet build NexusReader.slnx --no-restore

Run test suite:

dotnet test --no-restore

🗄️ Database Migrations

Automatic database migrations at startup (MigrateAsync()) have been disabled to ensure compatibility with Native AOT compilation and prevent locking issues in multi-instance environments.

To apply database migrations locally, run the EF Core migration command from the solution root:

dotnet ef database update --project src/NexusReader.Infrastructure --startup-project src/NexusReader.Web
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