diff --git a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
index 86b685e6..c5f75fc7 100644
--- a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
+++ b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
@@ -9,12 +9,14 @@ using System.Threading.Tasks;
 
 namespace AsbCloudApp.Services.Subsystems
 {
+#nullable enable
     public interface ISubsystemOperationTimeService
     {
-        Task<IEnumerable<SubsystemDto>> GetSubsystemAsync(int? idWell, CancellationToken token);
-        Task<IEnumerable<SubsystemStatDto>> GetStatAsync(SubsystemOperationTimeRequest request, CancellationToken token);       
+        Task<IEnumerable<SubsystemDto>?> GetSubsystemAsync(int? idWell, CancellationToken token);
+        Task<IEnumerable<SubsystemStatDto>?> GetStatAsync(SubsystemOperationTimeRequest request, CancellationToken token);       
         Task<int> DeleteAsync(SubsystemOperationTimeRequest request, CancellationToken token);
-        Task<IEnumerable<SubsystemOperationTimeDto>> GetOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);
+        Task<IEnumerable<SubsystemOperationTimeDto>?> GetOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);
         
     }
+#nullable disable
 }
diff --git a/AsbCloudDb/Model/Subsystems/Subsystem.cs b/AsbCloudDb/Model/Subsystems/Subsystem.cs
index 5fc7938c..70160f6e 100644
--- a/AsbCloudDb/Model/Subsystems/Subsystem.cs
+++ b/AsbCloudDb/Model/Subsystems/Subsystem.cs
@@ -16,14 +16,12 @@ namespace AsbCloudDb.Model.Subsystems
 
         [Column("name")]
         [StringLength(255)]
-        public string? Name { get; set; }
+        public string Name { get; set; } = null!;
 
         [Column("description")]
         [StringLength(255)]
         public string? Description { get; set; }
-
-        [InverseProperty(nameof(SubsystemOperationTime.Subsystem))]
-        public virtual ICollection<SubsystemOperationTime> SubsystemOperationTimes { get; set; }
+        
     }
     
 }
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
index 4eb973d3..ca25f361 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeBackgroundService.cs
@@ -88,18 +88,18 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             {
                 var stopwatch = Stopwatch.StartNew();
                 var newOperationsSaub = await OperationTimeSaubAsync(item.IdTelemetry, item.LastDate ?? DateTimeOffset.MinValue, db, token);
-                var newOperationsSpin = await OperationTimeSpinAsync(item.IdTelemetry, item.LastDate ?? DateTimeOffset.MinValue, db, token);
+                //var newOperationsSpin = await OperationTimeSpinAsync(item.IdTelemetry, item.LastDate ?? DateTimeOffset.MinValue, db, token);
                 stopwatch.Stop();
                 if (newOperationsSaub.Any())
                 {
                     db.SubsystemOperationTimes.AddRange(newOperationsSaub);
                     affected += await db.SaveChangesAsync(token);
                 }
-                if (newOperationsSpin.Any())
-                {
-                    db.SubsystemOperationTimes.AddRange(newOperationsSpin);
-                    affected += await db.SaveChangesAsync(token);
-                }
+                //if (newOperationsSpin.Any())
+                //{
+                //    db.SubsystemOperationTimes.AddRange(newOperationsSpin);
+                //    affected += await db.SaveChangesAsync(token);
+                //}
             }
             return affected;
         }
@@ -109,7 +109,7 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             var query = db.TelemetryDataSaub
                 .AsNoTracking()
                 .Where(d => d.IdTelemetry == idTelemetry)
-                .Select(d => new OperationTimeData
+                .Select(d => new 
                 {
                     DateTime = d.DateTime,                    
                     Mode = d.Mode,
@@ -162,7 +162,7 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             var query = db.TelemetryDataSpin
                 .AsNoTracking()
                 .Where(d => d.IdTelemetry == idTelemetry)
-                .Select(d => new OperationTimeData
+                .Select(d => new 
                 {
                     DateTime = d.DateTime,
                     Mode = d.Mode,
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index c46a19ff..2a793d1a 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -33,7 +33,7 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             this.subsystemService = subsystemService;
         }
 
-        private async Task<IEnumerable<SubsystemDto>> GetSubsystemAsync(int idWell, CancellationToken token)
+        private async Task<IEnumerable<SubsystemDto>> GetSubsystemByIdWellAsync(int idWell, CancellationToken token)
         {
             var well = await wellService.GetOrDefaultAsync(idWell, token);
             if (well?.IdTelemetry is null || well.Timezone is null)