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Tags Service – Tagging System

Overview

The Tags Service manages tags used across the system.
It is built using Vertical Slice Architecture with CQRS and a custom in-house Mediator implementation (no external NuGet packages).

The service uses:

  • Entity Framework Core
  • SQL Server Provider
  • Minimal APIs
  • DTO-based contracts
  • Strict validation rules
  • Unique index on Tag Name

Suspended tags are never returned in read endpoints.

Technology Stack

  • .NET
  • Entity Framework Core
  • SQL Server
  • Minimal APIs
  • CQRS (Command / Query separation)
  • Custom Shared Kernel Mediator(In Shared Kernal Referenace Project)
  • Vertical Slice Architecture

Architecture Style

Vertical Slice Structure

Each feature is isolated in its own folder with:

  • Command / Query
  • Handler
  • DTOs
  • Validation

TagsService │ ├── Domain │ └── Tag.cs │ ├── Infrastructure │ └── Persistence │ └── AppDbContext.cs │ ├── SharedKernel │ ├── Mediator │ │ ├── IRequest.cs │ │ ├── IRequestHandler.cs │ │ └── Mediator.cs │ ├── Features │ ├── CreateTag │ ├── GetAllTags │ ├── GetMostRecentTags │ ├── SuspendTag │ └── API └── TagsEndpoints.cs

Domain Model

Tag Entity

public class Tag
{
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTime CreatedAt { get; set; }
    public int AuthorId { get; set; }
    public bool IsSuspended { get; set; }
}

Validation Rules Summary

Tag name must be unique

Tag must exist to be suspended

Suspended tags are excluded from all read endpoints

Search uses indexed Name column for performance

Key Design Notes

No external CQRS or Mediator packages

Vertical Slice keeps features isolated

EF Core used directly

DTOs control API contracts

Clean separation of commands and queries