diff --git a/AsbCloudApp/Data/PaginationContainer.cs b/AsbCloudApp/Data/PaginationContainer.cs
index bdee31be..61840893 100644
--- a/AsbCloudApp/Data/PaginationContainer.cs
+++ b/AsbCloudApp/Data/PaginationContainer.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 
 namespace AsbCloudApp.Data
 {
@@ -13,16 +14,7 @@ namespace AsbCloudApp.Data
         /// </summary>
         public PaginationContainer()
         {
-            Items = new List<T>(4);
-        }
-
-        /// <summary>
-        /// конструктор
-        /// </summary>
-        /// <param name="capacity"></param>
-        public PaginationContainer(int capacity)
-        {
-            Items = new List<T>(capacity);
+            Items = Enumerable.Empty<T>();
         }
 
         /// <summary>
@@ -43,6 +35,6 @@ namespace AsbCloudApp.Data
         /// <summary>
         /// Данные
         /// </summary>
-        public List<T> Items { get; set; }
+        public IEnumerable<T> Items { get; set; }
     }
 }
diff --git a/AsbCloudApp/Repositories/IHelpPageRepository.cs b/AsbCloudApp/Repositories/IHelpPageRepository.cs
index 26f9c69e..82dd96a4 100644
--- a/AsbCloudApp/Repositories/IHelpPageRepository.cs
+++ b/AsbCloudApp/Repositories/IHelpPageRepository.cs
@@ -13,11 +13,22 @@ public interface IHelpPageRepository : ICrudRepository<HelpPageDto>
     /// <summary>
     /// Получение справки по url страницы и id категории 
     /// </summary>
-    /// <param name="urlPage"></param>
+    /// <param name="key"></param>
     /// <param name="idCategory"></param>
     /// <param name="cancellationToken"></param>
     /// <returns></returns>
-    Task<HelpPageDto?> GetOrDefaultByUrlPageAndIdCategoryAsync(string urlPage,
+    Task<HelpPageDto?> GetOrDefaultByUrlPageAndIdCategoryAsync(string key,
         int idCategory,
         CancellationToken cancellationToken);
+
+	/// <summary>
+	/// Проверяет наличие справки для страницы
+	/// </summary>
+	/// <param name="key"></param>
+	/// <param name="idCategory"></param>
+	/// <param name="cancellationToken"></param>
+	/// <returns></returns>
+	Task<bool> IsExistingAsync(string key,
+		int idCategory,
+		CancellationToken cancellationToken);
 }
diff --git a/AsbCloudInfrastructure/Repository/FileRepository.cs b/AsbCloudInfrastructure/Repository/FileRepository.cs
index 7b078e10..e75e7691 100644
--- a/AsbCloudInfrastructure/Repository/FileRepository.cs
+++ b/AsbCloudInfrastructure/Repository/FileRepository.cs
@@ -111,7 +111,7 @@ namespace AsbCloudInfrastructure.Repository
                 .ToListAsync(token)
                 .ConfigureAwait(false);
 
-            result.Items = entities.Select(e => Convert(e)).ToList();
+            result.Items = entities.Select(e => Convert(e));
 
             return result;
         }
diff --git a/AsbCloudInfrastructure/Repository/HelpPageRepository.cs b/AsbCloudInfrastructure/Repository/HelpPageRepository.cs
index dfc912a3..5742511f 100644
--- a/AsbCloudInfrastructure/Repository/HelpPageRepository.cs
+++ b/AsbCloudInfrastructure/Repository/HelpPageRepository.cs
@@ -16,13 +16,13 @@ public class HelpPageRepository : CrudRepositoryBase<HelpPageDto, HelpPage>,
     {
     }
     
-    public async Task<HelpPageDto?> GetOrDefaultByUrlPageAndIdCategoryAsync(string urlPage, 
+    public async Task<HelpPageDto?> GetOrDefaultByUrlPageAndIdCategoryAsync(string key, 
         int idCategory,
         CancellationToken cancellationToken)
     {
         var helpPage = await dbSet.AsNoTracking()
             .SingleOrDefaultAsync(x => 
-                x.UrlPage == urlPage && 
+                x.UrlPage == key && 
                 x.IdCategory == idCategory,
             cancellationToken);
 
@@ -31,4 +31,9 @@ public class HelpPageRepository : CrudRepositoryBase<HelpPageDto, HelpPage>,
 
         return helpPage.Adapt<HelpPageDto>();
     }
+
+    public Task<bool> IsExistingAsync(string key, int idCategory, CancellationToken cancellationToken) =>
+        dbContext.HelpPages.AnyAsync(h => h.UrlPage == key &&
+                                          h.IdCategory == idCategory, 
+            cancellationToken);
 }
diff --git a/AsbCloudInfrastructure/Repository/NotificationRepository.cs b/AsbCloudInfrastructure/Repository/NotificationRepository.cs
index 90799208..8a44a418 100644
--- a/AsbCloudInfrastructure/Repository/NotificationRepository.cs
+++ b/AsbCloudInfrastructure/Repository/NotificationRepository.cs
@@ -70,14 +70,14 @@ public class NotificationRepository : CrudCacheRepositoryBase<NotificationDto, N
 
 		if (result.Count < skip)
 			return result;
-		
+
 		result.Items = await query
 			.SortBy(request.SortFields)
 			.Skip(skip)
 			.Take(take)
 			.AsNoTracking()
 			.Select(x => x.Adapt<NotificationDto>())
-			.ToListAsync(cancellationToken);
+			.ToArrayAsync(cancellationToken);
 
 		return result;
 	}
diff --git a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
index 00c87dbb..5d4795cb 100644
--- a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
+++ b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
@@ -165,7 +165,7 @@ namespace AsbCloudInfrastructure.Repository
                 .Skip(result.Skip)
                 .Take(result.Take);
 
-            result.Items = await query.ToListAsync(token);
+            result.Items = await query.ToArrayAsync(token);
             return result;
         }
 
diff --git a/AsbCloudInfrastructure/Services/SAUB/MessageService.cs b/AsbCloudInfrastructure/Services/SAUB/MessageService.cs
index 7b49d5c8..82f0abfc 100644
--- a/AsbCloudInfrastructure/Services/SAUB/MessageService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/MessageService.cs
@@ -101,6 +101,8 @@ namespace AsbCloudInfrastructure.Services.SAUB
             var eventsDict = events.ToDictionary(x=>x.IdEvent, x => x);
             var usersDict = users.ToDictionary(x => x.IdUser, x => x);
 
+            var messagesDtoList = new List<MessageDto>();
+
             foreach (var message in messagesList)
             {
                 var messageDto = new MessageDto
@@ -126,10 +128,11 @@ namespace AsbCloudInfrastructure.Services.SAUB
                     messageDto.CategoryId = e.IdCategory;
                     messageDto.Message = e.MakeMessageText(message);
                 }
-
-                result.Items.Add(messageDto);
+                messagesDtoList.Add(messageDto);
             }
 
+            result.Items = result.Items.Concat(messagesDtoList);
+
             return result;
         }
 
diff --git a/AsbCloudWebApi/Controllers/HelpPageController.cs b/AsbCloudWebApi/Controllers/HelpPageController.cs
index bae2010e..c3a538a1 100644
--- a/AsbCloudWebApi/Controllers/HelpPageController.cs
+++ b/AsbCloudWebApi/Controllers/HelpPageController.cs
@@ -21,18 +21,21 @@ public class HelpPageController : ControllerBase
 {
     private readonly IHelpPageService helpPageService;
     private readonly IUserRepository userRepository;
+    private readonly IHelpPageRepository helpPageRepository;
 
     public HelpPageController(IHelpPageService helpPageService,
-        IUserRepository userRepository)
+        IUserRepository userRepository,
+        IHelpPageRepository helpPageRepository)
     {
         this.helpPageService = helpPageService;
         this.userRepository = userRepository;
+        this.helpPageRepository = helpPageRepository;
     }
 
     /// <summary>
     /// Загрузка файла справки
     /// </summary>
-    /// <param name="urlPage">Url страницы</param>
+    /// <param name="key">Ключ страницы</param>
     /// <param name="idCategory">Id категории файла. Допустимое значение параметра: 20000</param>
     /// <param name="file">Файл справки</param>
     /// <param name="cancellationToken">Токен для отмены задачи</param>
@@ -41,7 +44,7 @@ public class HelpPageController : ControllerBase
     [Permission]
     [ProducesResponseType(typeof(int), (int)HttpStatusCode.OK)]
     public async Task<IActionResult> UploadAsync(
-        string urlPage,
+        [Required] string key,
         [Range(minimum: 20000, maximum: 20000, ErrorMessage = "Категория файла недопустима. Допустимые: 20000")]
         int idCategory,
         [Required] IFormFile file,
@@ -57,7 +60,7 @@ public class HelpPageController : ControllerBase
 
         using var fileStream = file.OpenReadStream();
 
-        int helpPageId = await helpPageService.AddOrUpdateAsync(urlPage,
+        int helpPageId = await helpPageService.AddOrUpdateAsync(key,
             idCategory,
             file.FileName,
             fileStream,
@@ -69,19 +72,20 @@ public class HelpPageController : ControllerBase
     /// <summary>
     /// Получение файла справки
     /// </summary>
-    /// <param name="urlPage">Url страницы</param>
+    /// <param name="key">Ключ страницы</param>
     /// <param name="idCategory">Id категории файла. Допустимое значение параметра: 20000</param>
     /// <param name="cancellationToken">Токен для отмены задачи</param>
     /// <returns></returns>
     [HttpGet]
-    [Route("{urlPage}/{idCategory}")]
     [ProducesResponseType(typeof(PhysicalFileResult), (int)HttpStatusCode.OK)]
     [ProducesResponseType(StatusCodes.Status204NoContent)]
-    public async Task<IActionResult> GetFileAsync(string urlPage, 
-        int idCategory, 
+    public async Task<IActionResult> GetFileAsync(
+        [Required] string key, 
+        [Range(minimum: 20000, maximum: 20000, ErrorMessage = "Категория файла недопустима. Допустимые: 20000")]
+        int idCategory,
         CancellationToken cancellationToken)
     {
-        var file = await helpPageService.GetFileStreamAsync(urlPage,
+        var file = await helpPageService.GetFileStreamAsync(key,
             idCategory,
             cancellationToken);
 
@@ -94,4 +98,27 @@ public class HelpPageController : ControllerBase
         
         return File(memoryStream, "application/pdf", file.fileName);
     }
+
+    /// <summary>
+    /// Проверяет наличие справки для страницы
+    /// </summary>
+    /// <param name="key">Ключ страницы</param>
+    /// <param name="idCategory">Id категории файла. Допустимое значение параметра: 20000</param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    [HttpGet]
+    [Route("isExisting")]
+    [ProducesResponseType(typeof(bool), (int)HttpStatusCode.OK)]
+    public async Task<IActionResult> IsExistingAsync(
+        [Required] string key,
+        [Range(minimum: 20000, maximum: 20000, ErrorMessage = "Категория файла недопустима. Допустимые: 20000")]
+        int idCategory,
+        CancellationToken cancellationToken)
+    {
+        var helpPage = await helpPageRepository.GetOrDefaultByUrlPageAndIdCategoryAsync(key,
+            idCategory,
+            cancellationToken);
+        
+        return Ok(helpPage != null);
+    }
 }