improvement: Notification 도메인 구축 (#247)

- Domain: NotificationCategory enum, Notification entity, INotificationRepository
- Infrastructure: NotificationConfiguration, NotificationRepository, AppDbContext/DI 등록
- Migration: AddNotificationTable 생성 및 적용
- Application: DTO 7개, INotificationService, NotificationService, DI 등록
- API: NotificationController (summary, list, read, read-all)

Closes #247

SPMS.API/Controllers/NotificationController.cs

@@ -0,0 +1,68 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Swashbuckle.AspNetCore.Annotations;
+using SPMS.Application.DTOs.Notification;
+using SPMS.Application.Interfaces;
+using SPMS.Domain.Common;
+using SPMS.Domain.Exceptions;
+
+namespace SPMS.API.Controllers;
+
+[ApiController]
+[Route("v1/in/notification")]
+[Authorize]
+[ApiExplorerSettings(GroupName = "notification")]
+public class NotificationController : ControllerBase
+{
+    private readonly INotificationService _notificationService;
+
+    public NotificationController(INotificationService notificationService)
+    {
+        _notificationService = notificationService;
+    }
+
+    [HttpPost("summary")]
+    [SwaggerOperation(Summary = "알림 요약 조회", Description = "최근 N건의 알림과 미읽 건수를 반환합니다. 헤더 뱃지용.")]
+    public async Task<IActionResult> GetSummaryAsync([FromBody] NotificationSummaryRequestDto request)
+    {
+        var adminId = GetAdminId();
+        var result = await _notificationService.GetSummaryAsync(adminId, request);
+        return Ok(ApiResponse<NotificationSummaryResponseDto>.Success(result));
+    }
+
+    [HttpPost("list")]
+    [SwaggerOperation(Summary = "알림 목록 조회", Description = "알림 목록을 페이지 단위로 조회합니다. 카테고리/기간/읽음 필터를 지원합니다.")]
+    public async Task<IActionResult> GetListAsync([FromBody] NotificationListRequestDto request)
+    {
+        var adminId = GetAdminId();
+        var result = await _notificationService.GetListAsync(adminId, request);
+        return Ok(ApiResponse<NotificationListResponseDto>.Success(result));
+    }
+
+    [HttpPost("read")]
+    [SwaggerOperation(Summary = "알림 읽음 처리", Description = "단건 알림을 읽음 처리합니다. 이미 읽은 알림은 무시(멱등).")]
+    public async Task<IActionResult> MarkAsReadAsync([FromBody] NotificationReadRequestDto request)
+    {
+        var adminId = GetAdminId();
+        var result = await _notificationService.MarkAsReadAsync(adminId, request);
+        return Ok(ApiResponse<NotificationReadResponseDto>.Success(result));
+    }
+
+    [HttpPost("read-all")]
+    [SwaggerOperation(Summary = "알림 전체 읽음", Description = "해당 관리자의 모든 미읽 알림을 일괄 읽음 처리합니다.")]
+    public async Task<IActionResult> MarkAllAsReadAsync()
+    {
+        var adminId = GetAdminId();
+        var result = await _notificationService.MarkAllAsReadAsync(adminId);
+        return Ok(ApiResponse<NotificationReadResponseDto>.Success(result));
+    }
+
+    private long GetAdminId()
+    {
+        var adminIdClaim = User.FindFirst("adminId")?.Value;
+        if (string.IsNullOrEmpty(adminIdClaim) || !long.TryParse(adminIdClaim, out var adminId))
+            throw new SpmsException(ErrorCodes.Unauthorized, "인증 정보가 올바르지 않습니다.", 401);
+
+        return adminId;
+    }
+}

SPMS.Application/DTOs/Notification/NotificationItemDto.cs

@@ -0,0 +1,30 @@
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationItemDto
+{
+    [JsonPropertyName("notification_id")]
+    public long NotificationId { get; set; }
+
+    [JsonPropertyName("category")]
+    public string Category { get; set; } = string.Empty;
+
+    [JsonPropertyName("title")]
+    public string Title { get; set; } = string.Empty;
+
+    [JsonPropertyName("content")]
+    public string Content { get; set; } = string.Empty;
+
+    [JsonPropertyName("link_url")]
+    public string? LinkUrl { get; set; }
+
+    [JsonPropertyName("is_read")]
+    public bool IsRead { get; set; }
+
+    [JsonPropertyName("read_at")]
+    public DateTime? ReadAt { get; set; }
+
+    [JsonPropertyName("created_at")]
+    public DateTime CreatedAt { get; set; }
+}

SPMS.Application/DTOs/Notification/NotificationListRequestDto.cs

@@ -0,0 +1,24 @@
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationListRequestDto
+{
+    [JsonPropertyName("page")]
+    public int Page { get; set; } = 1;
+
+    [JsonPropertyName("size")]
+    public int Size { get; set; } = 20;
+
+    [JsonPropertyName("category")]
+    public string? Category { get; set; }
+
+    [JsonPropertyName("from")]
+    public DateTime? From { get; set; }
+
+    [JsonPropertyName("to")]
+    public DateTime? To { get; set; }
+
+    [JsonPropertyName("is_read")]
+    public bool? IsRead { get; set; }
+}

SPMS.Application/DTOs/Notification/NotificationListResponseDto.cs

@@ -0,0 +1,16 @@
+using System.Text.Json.Serialization;
+using SPMS.Application.DTOs.Notice;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationListResponseDto
+{
+    [JsonPropertyName("items")]
+    public List<NotificationItemDto> Items { get; set; } = new();
+
+    [JsonPropertyName("pagination")]
+    public PaginationDto Pagination { get; set; } = new();
+
+    [JsonPropertyName("unread_count")]
+    public int UnreadCount { get; set; }
+}

SPMS.Application/DTOs/Notification/NotificationReadRequestDto.cs

@@ -0,0 +1,11 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationReadRequestDto
+{
+    [Required]
+    [JsonPropertyName("notification_id")]
+    public long NotificationId { get; set; }
+}

SPMS.Application/DTOs/Notification/NotificationReadResponseDto.cs

@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationReadResponseDto
+{
+    [JsonPropertyName("unread_count")]
+    public int UnreadCount { get; set; }
+}

SPMS.Application/DTOs/Notification/NotificationSummaryRequestDto.cs

@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationSummaryRequestDto
+{
+    [JsonPropertyName("limit")]
+    public int Limit { get; set; } = 5;
+}

SPMS.Application/DTOs/Notification/NotificationSummaryResponseDto.cs

@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+
+namespace SPMS.Application.DTOs.Notification;
+
+public class NotificationSummaryResponseDto
+{
+    [JsonPropertyName("recent_items")]
+    public List<NotificationItemDto> RecentItems { get; set; } = new();
+
+    [JsonPropertyName("unread_count")]
+    public int UnreadCount { get; set; }
+}

SPMS.Application/DependencyInjection.cs

@@ -23,6 +23,7 @@ public static class DependencyInjection
         services.AddScoped<IMessageService, MessageService>();
         services.AddScoped<IStatsService, StatsService>();
         services.AddScoped<ITagService, TagService>();
+        services.AddScoped<INotificationService, NotificationService>();
 
         return services;
     }

SPMS.Application/Interfaces/INotificationService.cs

@@ -0,0 +1,11 @@
+using SPMS.Application.DTOs.Notification;
+
+namespace SPMS.Application.Interfaces;
+
+public interface INotificationService
+{
+    Task<NotificationSummaryResponseDto> GetSummaryAsync(long adminId, NotificationSummaryRequestDto request);
+    Task<NotificationListResponseDto> GetListAsync(long adminId, NotificationListRequestDto request);
+    Task<NotificationReadResponseDto> MarkAsReadAsync(long adminId, NotificationReadRequestDto request);
+    Task<NotificationReadResponseDto> MarkAllAsReadAsync(long adminId);
+}

SPMS.Application/Services/NotificationService.cs

@@ -0,0 +1,104 @@
+using SPMS.Application.DTOs.Notice;
+using SPMS.Application.DTOs.Notification;
+using SPMS.Application.Interfaces;
+using SPMS.Domain.Common;
+using SPMS.Domain.Enums;
+using SPMS.Domain.Exceptions;
+using SPMS.Domain.Interfaces;
+
+namespace SPMS.Application.Services;
+
+public class NotificationService : INotificationService
+{
+    private readonly INotificationRepository _notificationRepository;
+    private readonly IUnitOfWork _unitOfWork;
+
+    public NotificationService(
+        INotificationRepository notificationRepository,
+        IUnitOfWork unitOfWork)
+    {
+        _notificationRepository = notificationRepository;
+        _unitOfWork = unitOfWork;
+    }
+
+    public async Task<NotificationSummaryResponseDto> GetSummaryAsync(long adminId, NotificationSummaryRequestDto request)
+    {
+        var limit = request.Limit > 0 ? request.Limit : 5;
+        var recentItems = await _notificationRepository.GetRecentAsync(adminId, limit);
+        var unreadCount = await _notificationRepository.GetUnreadCountAsync(adminId);
+
+        return new NotificationSummaryResponseDto
+        {
+            RecentItems = recentItems.Select(MapToItemDto).ToList(),
+            UnreadCount = unreadCount
+        };
+    }
+
+    public async Task<NotificationListResponseDto> GetListAsync(long adminId, NotificationListRequestDto request)
+    {
+        // category 문자열 → enum 파싱
+        NotificationCategory? category = null;
+        if (!string.IsNullOrWhiteSpace(request.Category))
+        {
+            if (!Enum.TryParse<NotificationCategory>(request.Category, true, out var parsed))
+                throw new SpmsException(ErrorCodes.BadRequest, $"유효하지 않은 카테고리: {request.Category}");
+            category = parsed;
+        }
+
+        var (items, totalCount) = await _notificationRepository.GetPagedAsync(
+            adminId, category, request.From, request.To, request.IsRead, request.Page, request.Size);
+
+        var unreadCount = await _notificationRepository.GetUnreadCountAsync(adminId);
+        var totalPages = (int)Math.Ceiling((double)totalCount / request.Size);
+
+        return new NotificationListResponseDto
+        {
+            Items = items.Select(MapToItemDto).ToList(),
+            Pagination = new PaginationDto
+            {
+                Page = request.Page,
+                Size = request.Size,
+                TotalCount = totalCount,
+                TotalPages = totalPages
+            },
+            UnreadCount = unreadCount
+        };
+    }
+
+    public async Task<NotificationReadResponseDto> MarkAsReadAsync(long adminId, NotificationReadRequestDto request)
+    {
+        var notification = await _notificationRepository.GetByIdAndAdminAsync(request.NotificationId, adminId);
+        if (notification == null)
+            throw new SpmsException(ErrorCodes.NotFound, "알림을 찾을 수 없습니다.", 404);
+
+        // 멱등성: 이미 읽은 알림은 스킵
+        if (!notification.IsRead)
+        {
+            notification.IsRead = true;
+            notification.ReadAt = DateTime.UtcNow;
+            _notificationRepository.Update(notification);
+            await _unitOfWork.SaveChangesAsync();
+        }
+
+        var unreadCount = await _notificationRepository.GetUnreadCountAsync(adminId);
+        return new NotificationReadResponseDto { UnreadCount = unreadCount };
+    }
+
+    public async Task<NotificationReadResponseDto> MarkAllAsReadAsync(long adminId)
+    {
+        await _notificationRepository.MarkAllAsReadAsync(adminId);
+        return new NotificationReadResponseDto { UnreadCount = 0 };
+    }
+
+    private static NotificationItemDto MapToItemDto(Domain.Entities.Notification n) => new()
+    {
+        NotificationId = n.Id,
+        Category = n.Category.ToString().ToLower(),
+        Title = n.Title,
+        Content = n.Content,
+        LinkUrl = n.LinkUrl,
+        IsRead = n.IsRead,
+        ReadAt = n.ReadAt,
+        CreatedAt = n.CreatedAt
+    };
+}

SPMS.Domain/Entities/Notification.cs

@@ -0,0 +1,18 @@
+using SPMS.Domain.Enums;
+
+namespace SPMS.Domain.Entities;
+
+public class Notification : BaseEntity
+{
+    public long TargetAdminId { get; set; }
+    public NotificationCategory Category { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
+    public string? LinkUrl { get; set; }
+    public bool IsRead { get; set; }
+    public DateTime? ReadAt { get; set; }
+    public DateTime CreatedAt { get; set; }
+
+    // Navigation
+    public Admin TargetAdmin { get; set; } = null!;
+}

SPMS.Domain/Enums/NotificationCategory.cs

@@ -0,0 +1,10 @@
+namespace SPMS.Domain.Enums;
+
+public enum NotificationCategory : byte
+{
+    Send = 0,        // 발송
+    Certificate = 1, // 인증서
+    Service = 2,     // 서비스
+    Failure = 3,     // 실패
+    System = 4       // 시스템
+}

SPMS.Domain/Interfaces/INotificationRepository.cs

@@ -0,0 +1,15 @@
+using SPMS.Domain.Entities;
+using SPMS.Domain.Enums;
+
+namespace SPMS.Domain.Interfaces;
+
+public interface INotificationRepository : IRepository<Notification>
+{
+    Task<(IReadOnlyList<Notification> Items, int TotalCount)> GetPagedAsync(
+        long adminId, NotificationCategory? category, DateTime? from, DateTime? to,
+        bool? isRead, int page, int size);
+    Task<int> GetUnreadCountAsync(long adminId);
+    Task<IReadOnlyList<Notification>> GetRecentAsync(long adminId, int limit);
+    Task<Notification?> GetByIdAndAdminAsync(long id, long adminId);
+    Task<int> MarkAllAsReadAsync(long adminId);
+}

SPMS.Infrastructure/AppDbContext.cs

@@ -26,6 +26,7 @@ public class AppDbContext : DbContext
     public DbSet<Faq> Faqs => Set<Faq>();
     public DbSet<AppConfig> AppConfigs => Set<AppConfig>();
     public DbSet<Tag> Tags => Set<Tag>();
+    public DbSet<Notification> Notifications => Set<Notification>();
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {

SPMS.Infrastructure/DependencyInjection.cs

@@ -44,6 +44,7 @@ public static class DependencyInjection
         services.AddScoped<IDailyStatRepository, DailyStatRepository>();
         services.AddScoped<IWebhookLogRepository, WebhookLogRepository>();
         services.AddScoped<ITagRepository, TagRepository>();
+        services.AddScoped<INotificationRepository, NotificationRepository>();
 
         // External Services
         services.AddScoped<IJwtService, JwtService>();

SPMS.Infrastructure/Migrations/20260226003916_AddNotificationTable.cs

@@ -0,0 +1,63 @@
+using System;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SPMS.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddNotificationTable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Notification",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn),
+                    TargetAdminId = table.Column<long>(type: "bigint", nullable: false),
+                    Category = table.Column<byte>(type: "tinyint unsigned", nullable: false),
+                    Title = table.Column<string>(type: "varchar(200)", maxLength: 200, nullable: false)
+                        .Annotation("MySql:CharSet", "utf8mb4"),
+                    Content = table.Column<string>(type: "varchar(1000)", maxLength: 1000, nullable: false)
+                        .Annotation("MySql:CharSet", "utf8mb4"),
+                    LinkUrl = table.Column<string>(type: "varchar(500)", maxLength: 500, nullable: true)
+                        .Annotation("MySql:CharSet", "utf8mb4"),
+                    IsRead = table.Column<bool>(type: "tinyint(1)", nullable: false, defaultValue: false),
+                    ReadAt = table.Column<DateTime>(type: "datetime(6)", nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Notification", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Notification_Admin_TargetAdminId",
+                        column: x => x.TargetAdminId,
+                        principalTable: "Admin",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notification_TargetAdminId_CreatedAt",
+                table: "Notification",
+                columns: new[] { "TargetAdminId", "CreatedAt" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notification_TargetAdminId_IsRead",
+                table: "Notification",
+                columns: new[] { "TargetAdminId", "IsRead" });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Notification");
+        }
+    }
+}

SPMS.Infrastructure/Migrations/AppDbContextModelSnapshot.cs

@@ -536,6 +536,54 @@ namespace SPMS.Infrastructure.Migrations
                     b.ToTable("Notice", (string)null);
                 });
 
+            modelBuilder.Entity("SPMS.Domain.Entities.Notification", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<long>("Id"));
+
+                    b.Property<byte>("Category")
+                        .HasColumnType("tinyint unsigned");
+
+                    b.Property<string>("Content")
+                        .IsRequired()
+                        .HasMaxLength(1000)
+                        .HasColumnType("varchar(1000)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<bool>("IsRead")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("tinyint(1)")
+                        .HasDefaultValue(false);
+
+                    b.Property<string>("LinkUrl")
+                        .HasMaxLength(500)
+                        .HasColumnType("varchar(500)");
+
+                    b.Property<DateTime?>("ReadAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<long>("TargetAdminId")
+                        .HasColumnType("bigint");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("varchar(200)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TargetAdminId", "CreatedAt");
+
+                    b.HasIndex("TargetAdminId", "IsRead");
+
+                    b.ToTable("Notification", (string)null);
+                });
+
             modelBuilder.Entity("SPMS.Domain.Entities.Payment", b =>
                 {
                     b.Property<long>("Id")
@@ -1029,6 +1077,17 @@ namespace SPMS.Infrastructure.Migrations
                     b.Navigation("Service");
                 });
 
+            modelBuilder.Entity("SPMS.Domain.Entities.Notification", b =>
+                {
+                    b.HasOne("SPMS.Domain.Entities.Admin", "TargetAdmin")
+                        .WithMany()
+                        .HasForeignKey("TargetAdminId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("TargetAdmin");
+                });
+
             modelBuilder.Entity("SPMS.Domain.Entities.Payment", b =>
                 {
                     b.HasOne("SPMS.Domain.Entities.Admin", "Admin")

SPMS.Infrastructure/Persistence/Configurations/NotificationConfiguration.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SPMS.Domain.Entities;
+
+namespace SPMS.Infrastructure.Persistence.Configurations;
+
+public class NotificationConfiguration : IEntityTypeConfiguration<Notification>
+{
+    public void Configure(EntityTypeBuilder<Notification> builder)
+    {
+        builder.ToTable("Notification");
+
+        builder.HasKey(e => e.Id);
+        builder.Property(e => e.Id).ValueGeneratedOnAdd();
+
+        builder.Property(e => e.Title).HasMaxLength(200).IsRequired();
+        builder.Property(e => e.Content).HasMaxLength(1000).IsRequired();
+        builder.Property(e => e.LinkUrl).HasMaxLength(500);
+        builder.Property(e => e.IsRead).IsRequired().HasDefaultValue(false);
+        builder.Property(e => e.CreatedAt).IsRequired();
+
+        builder.HasOne(e => e.TargetAdmin)
+            .WithMany()
+            .HasForeignKey(e => e.TargetAdminId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(e => new { e.TargetAdminId, e.CreatedAt });
+        builder.HasIndex(e => new { e.TargetAdminId, e.IsRead });
+    }
+}

SPMS.Infrastructure/Persistence/Repositories/NotificationRepository.cs

@@ -0,0 +1,60 @@
+using Microsoft.EntityFrameworkCore;
+using SPMS.Domain.Entities;
+using SPMS.Domain.Enums;
+using SPMS.Domain.Interfaces;
+
+namespace SPMS.Infrastructure.Persistence.Repositories;
+
+public class NotificationRepository : Repository<Notification>, INotificationRepository
+{
+    public NotificationRepository(AppDbContext context) : base(context) { }
+
+    public async Task<(IReadOnlyList<Notification> Items, int TotalCount)> GetPagedAsync(
+        long adminId, NotificationCategory? category, DateTime? from, DateTime? to,
+        bool? isRead, int page, int size)
+    {
+        IQueryable<Notification> query = _dbSet.Where(n => n.TargetAdminId == adminId);
+
+        if (category.HasValue)
+            query = query.Where(n => n.Category == category.Value);
+
+        if (from.HasValue)
+            query = query.Where(n => n.CreatedAt >= from.Value);
+
+        if (to.HasValue)
+            query = query.Where(n => n.CreatedAt <= to.Value);
+
+        if (isRead.HasValue)
+            query = query.Where(n => n.IsRead == isRead.Value);
+
+        var totalCount = await query.CountAsync();
+
+        var items = await query
+            .OrderByDescending(n => n.CreatedAt)
+            .Skip((page - 1) * size)
+            .Take(size)
+            .ToListAsync();
+
+        return (items, totalCount);
+    }
+
+    public async Task<int> GetUnreadCountAsync(long adminId)
+        => await _dbSet.CountAsync(n => n.TargetAdminId == adminId && !n.IsRead);
+
+    public async Task<IReadOnlyList<Notification>> GetRecentAsync(long adminId, int limit)
+        => await _dbSet
+            .Where(n => n.TargetAdminId == adminId)
+            .OrderByDescending(n => n.CreatedAt)
+            .Take(limit)
+            .ToListAsync();
+
+    public async Task<Notification?> GetByIdAndAdminAsync(long id, long adminId)
+        => await _dbSet.FirstOrDefaultAsync(n => n.Id == id && n.TargetAdminId == adminId);
+
+    public async Task<int> MarkAllAsReadAsync(long adminId)
+        => await _dbSet
+            .Where(n => n.TargetAdminId == adminId && !n.IsRead)
+            .ExecuteUpdateAsync(s => s
+                .SetProperty(n => n.IsRead, true)
+                .SetProperty(n => n.ReadAt, DateTime.UtcNow));
+}