diff --git a/AsbCloudDb/Model/DefaultData/EntityNotificationCategory.cs b/AsbCloudDb/Model/DefaultData/EntityNotificationCategory.cs
index f65bd4e1..2a2e5eab 100644
--- a/AsbCloudDb/Model/DefaultData/EntityNotificationCategory.cs
+++ b/AsbCloudDb/Model/DefaultData/EntityNotificationCategory.cs
@@ -4,6 +4,6 @@ public class EntityNotificationCategory : EntityFiller<NotificationCategory>
 {
 	public override NotificationCategory[] GetData() => new NotificationCategory[]
 	{
-		new() { Id = 1, Name = "Системные уведомления" }
+		new() { Id = NotificationCategory.IdSystemNotificationCategory, Name = "Системные уведомления" }
 	};
 }
\ No newline at end of file
diff --git a/AsbCloudDb/Model/NotificationCategory.cs b/AsbCloudDb/Model/NotificationCategory.cs
index 3da37e30..879b59d8 100644
--- a/AsbCloudDb/Model/NotificationCategory.cs
+++ b/AsbCloudDb/Model/NotificationCategory.cs
@@ -8,7 +8,13 @@ namespace AsbCloudDb.Model;
 [Table("t_notification_category"), Comment("Категории уведомлений")]
 public class NotificationCategory : IId
 {
-	[Key]
+    #region constants category notifications ids
+    /// <summary>
+    /// СИСТЕМНЫЕ УВЕДОМЛЕНИЯ
+    /// </summary>
+    public const int IdSystemNotificationCategory = 1;
+
+    [Key]
 	[Column("id")]
 	public int Id { get; set; }
 
diff --git a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
index c91689a3..c7fc2f5d 100644
--- a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
+++ b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramService.cs
@@ -35,7 +35,6 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
         private readonly BackgroundWorker backgroundWorker;
         private readonly NotificationService notificationService;
         
-        private const int idNotificationCategory = 20000;
         private const int idTransportType = 1;
         
         private const int idFileCategoryDrillingProgram = 1000;
@@ -398,7 +397,7 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
             await notificationService.NotifyAsync(new NotifyRequest
             {
                 IdUser = user.Id,
-                IdNotificationCategory = idNotificationCategory,
+                IdNotificationCategory = NotificationCategory.IdSystemNotificationCategory,
                 Title = subject,
                 Message = body,
                 IdTransportType = idTransportType
@@ -422,7 +421,7 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
                 await notificationService.NotifyAsync(new NotifyRequest
                 {
                     IdUser = user.Id,
-                    IdNotificationCategory = idNotificationCategory,
+                    IdNotificationCategory = NotificationCategory.IdSystemNotificationCategory,
                     Title = subject,
                     Message = body,
                     IdTransportType = idTransportType
@@ -442,7 +441,7 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
             await notificationService.NotifyAsync(new NotifyRequest
             {
                 IdUser = user.Id,
-                IdNotificationCategory = idNotificationCategory,
+                IdNotificationCategory = NotificationCategory.IdSystemNotificationCategory,
                 Title = subject,
                 Message = body,
                 IdTransportType = idTransportType
diff --git a/AsbCloudInfrastructure/Services/WellFinalDocumentsService.cs b/AsbCloudInfrastructure/Services/WellFinalDocumentsService.cs
index 8ac7c15c..7a736ba9 100644
--- a/AsbCloudInfrastructure/Services/WellFinalDocumentsService.cs
+++ b/AsbCloudInfrastructure/Services/WellFinalDocumentsService.cs
@@ -11,6 +11,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using AsbCloudApp.Services.Notifications;
+using AsbCloudDb.Model;
 
 namespace AsbCloudInfrastructure.Services
 {
@@ -136,7 +137,6 @@ namespace AsbCloudInfrastructure.Services
         private async Task SendMessageAsync(WellDto well, UserDto user, string documentCategory, string message, 
             CancellationToken cancellationToken)
         {
-            const int idNotificationCategory = 20000;
             const int idTransportType = 1;
             
             var factory = new WellFinalDocumentMailBodyFactory(configuration);
@@ -151,7 +151,7 @@ namespace AsbCloudInfrastructure.Services
             await notificationService.NotifyAsync(new NotifyRequest
             {
                 IdUser = user.Id,
-                IdNotificationCategory = idNotificationCategory,
+                IdNotificationCategory = NotificationCategory.IdSystemNotificationCategory,
                 Title = subject,
                 Message = body,
                 IdTransportType = idTransportType