diff --git a/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj b/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
index 36035215..189f6383 100644
--- a/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
+++ b/AsbCloudInfrastructure/AsbCloudInfrastructure.csproj
@@ -35,6 +35,7 @@
     <PackageReference Include="Mapster" Version="7.3.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="6.0.1" />
     <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="6.18.0" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.3" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.18.0" />
   </ItemGroup>
 
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
index e67a969b..e8e879c1 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
@@ -6,6 +6,7 @@ using Microsoft.Extensions.Hosting;
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.Data.SqlClient;
 using System.Diagnostics;
 using System.Linq;
 using System.Threading;
@@ -15,7 +16,7 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 {
 #nullable enable    
     internal class SubsystemOperationTimeBackgroundService : BackgroundService
-    {
+    {       
         private readonly string connectionString;
         private readonly TimeSpan period = TimeSpan.FromHours(1);
         private const int idSubsytemTorqueMaster = 65537;
@@ -102,43 +103,62 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             return affected;
         }
         private static async Task<IEnumerable<SubsystemOperationTime>?> OperationTimeSaubAsync(int idTelemetry, DateTimeOffset begin, IAsbCloudDbContext db, CancellationToken token)
-        {
-            var dateStart = db.TelemetryDataSaub
-                .AsNoTracking()
-                .Where(d => (d.IdTelemetry == idTelemetry) & (d.DateTime >= begin))
-                .Min(d => d.DateTime);
-            var depthStart = db.TelemetryDataSaub
-                .AsNoTracking()
-                .Where(d => (d.IdTelemetry == idTelemetry) & (d.DateTime >= begin))
-                .Min(d => d.WellDepth);
-
-            var operationTimeSpinWithDepth =
-                $"select tt.date, tt.mode, tt.mode_prev, tt.well_depth" +
+        {            
+            var operationTimeSaub =
+                $"select tt.date, tt.mode, tt.well_depth" +
                 $" from (select date, mode, well_depth, lag(mode,1) over (order by date) as mode_prev" +
-                $" from t_telemetry_data_saub where id_telemetry = {idTelemetry}) as tt" +
-                $" where tt.mode != tt.mode_prev and tt.date >='{begin}' order by tt.date;";
+                $" from t_telemetry_data_saub where id_telemetry = @idTelemetry) as tt" +
+                $" where tt.mode != tt.mode_prev and tt.date >=@begin order by tt.date;";
             using var command = db.Database.GetDbConnection().CreateCommand();
-            command.CommandText = operationTimeSpinWithDepth;
-            command.
+            command.CommandText = operationTimeSaub;
+            SqlParameter telemetry = new SqlParameter("@idTelemetry", idTelemetry);
+            command.Parameters.Add(telemetry);
+            SqlParameter dateStart = new SqlParameter("@begin", begin);
+            command.Parameters.Add(dateStart);
             db.Database.OpenConnection();
             using var result = await command.ExecuteReaderAsync(token);
-            var resultSubsystemOperationTime = new List<SubsystemOperationTime>();
+            var telemetryOpearationSaubSubsystems = new List<SubsystemsSpinWithDepth>();
             if (result.HasRows)
             {
                 while (result.Read())
                 {
-                    var itemEntity = new SubsystemOperationTime()
+                    var itemEntity = new SubsystemsSpinWithDepth()
+                    {
+                        Date = result.GetFieldValue<DateTimeOffset>(0),
+                        IdSubsystem = result.GetFieldValue<short>(1)+1,                        
+                        Depth = result.GetFieldValue<float>(2)
+                    };
+                    telemetryOpearationSaubSubsystems.Add(itemEntity);                    
+                }
+            }
+            var resultSubsystemOperationTime = new List<SubsystemOperationTime>();
+            var firstItem = telemetryOpearationSaubSubsystems.FirstOrDefault();
+            if (firstItem is null)
+                return null;
+            int idSubsystem = firstItem.IdSubsystem;
+            DateTimeOffset dateBegin = firstItem.Date;
+            float? depthStart = firstItem.Depth;
+            for (int i = 1; i < telemetryOpearationSaubSubsystems.Count; i++)
+            {
+                if (telemetryOpearationSaubSubsystems[i].IdSubsystem != idSubsystem)
+                {
+                    var operationTimeItem = new SubsystemOperationTime()
                     {
                         IdTelemetry = idTelemetry,
-                        DateStart = dateStart,
-                        DateEnd = result.GetFieldValue<DateTimeOffset>(0),
+                        DateStart = dateBegin,
+                        IdSubsystem = telemetryOpearationSaubSubsystems[i - 1].IdSubsystem,
+                        DateEnd = telemetryOpearationSaubSubsystems[i].Date,
                         DepthStart = depthStart,
-                        DepthEnd = result.GetFieldValue<float>(3),
-                        IdSubsystem = result.GetFieldValue<short>(2) + 1
+                        DepthEnd = telemetryOpearationSaubSubsystems[i].Depth
+
                     };
-                    dateStart = itemEntity.DateEnd;
-                    depthStart = itemEntity.DepthStart;
-                    resultSubsystemOperationTime.Add(itemEntity);
+                    dateBegin = telemetryOpearationSaubSubsystems[i].Date;
+                    depthStart = telemetryOpearationSaubSubsystems[i].Depth;
+                    idSubsystem = telemetryOpearationSaubSubsystems[i].IdSubsystem;
+                    if (telemetryOpearationSaubSubsystems[i - 1].IdSubsystem != 0)
+                    {
+                        resultSubsystemOperationTime.Add(operationTimeItem);
+                    }
                 }
             }
             return resultSubsystemOperationTime;
@@ -157,6 +177,10 @@ namespace AsbCloudInfrastructure.Services.Subsystems
                 $"where mode!=mode_pre or state != state_pre order by \"date\";";
             using var command = db.Database.GetDbConnection().CreateCommand();
             command.CommandText = operationTimeSpinWithDepth;
+            SqlParameter telemetry = new SqlParameter("@idTelemetry", idTelemetry);
+            command.Parameters.Add(telemetry);
+            SqlParameter dateStart = new SqlParameter("@begin", begin);
+            command.Parameters.Add(dateStart);
             db.Database.OpenConnection();
             using var result = await command.ExecuteReaderAsync(token);
             var telemetryOpearationSpinSubsystems = new List<SubsystemsSpinWithDepth>();