diff --git a/AsbCloudDb/EFExtentions.cs b/AsbCloudDb/EFExtentions.cs
index 5114120b..fdf22fbc 100644
--- a/AsbCloudDb/EFExtentions.cs
+++ b/AsbCloudDb/EFExtentions.cs
@@ -33,8 +33,11 @@ namespace AsbCloudDb
                         s => System.Text.Json.JsonSerializer.Deserialize<TProperty>(s, jsonSerializerOptions)!);
 
             ValueComparer<TProperty> valueComparer = new (
-                (a,b) => a.GetHashCode() == b.GetHashCode(),
-                i => i.GetHashCode(),
+                (a,b) => 
+                    (a!=null) && (b != null)
+                        ? a.GetHashCode() == b.GetHashCode()
+                        : (a == null) && (b == null),
+                i => (i == null) ?-1 : i.GetHashCode(),
                 i => i);
             
             builder.Metadata.SetValueComparer(valueComparer);
diff --git a/AsbCloudDb/Model/AsbCloudDbContext.cs b/AsbCloudDb/Model/AsbCloudDbContext.cs
index b225572f..3fc9fa73 100644
--- a/AsbCloudDb/Model/AsbCloudDbContext.cs
+++ b/AsbCloudDb/Model/AsbCloudDbContext.cs
@@ -345,14 +345,15 @@ namespace AsbCloudDb.Model
             FillData(modelBuilder);
         }
 
-        public Task<int> RefreshMaterializedViewAsync<TEntity>(CancellationToken token = default)
+        public Task<int> RefreshMaterializedViewAsync<TEntity>(CancellationToken token)
             where TEntity : class
         {
-            var materializedViewName = Set<TEntity>().EntityType.GetViewName();
-            return RefreshMaterializedViewAsync(materializedViewName!, token);
+            var materializedViewName = Set<TEntity>().EntityType.GetViewName()
+                ?? throw new System.Exception($"RefreshMaterializedViewAsync<{typeof(TEntity).Name}>(..) db table for this type does not found.");
+            return RefreshMaterializedViewAsync(materializedViewName, token);
         }
 
-        public Task<int> RefreshMaterializedViewAsync(string materializedViewName, CancellationToken token = default)
+        public Task<int> RefreshMaterializedViewAsync(string materializedViewName, CancellationToken token)
         {
             var sql = $"REFRESH MATERIALIZED VIEW {materializedViewName};";
             return Database.ExecuteSqlRawAsync(sql, token);
diff --git a/AsbCloudDb/Model/IAsbCloudDbContext.cs b/AsbCloudDb/Model/IAsbCloudDbContext.cs
index 84f4a824..ce965004 100644
--- a/AsbCloudDb/Model/IAsbCloudDbContext.cs
+++ b/AsbCloudDb/Model/IAsbCloudDbContext.cs
@@ -56,8 +56,8 @@ namespace AsbCloudDb.Model
 
         DatabaseFacade Database { get; }
 
-        Task<int> RefreshMaterializedViewAsync(string? mwName = null, CancellationToken token = default);
-        Task<int> RefreshMaterializedViewAsync<TEntity>(CancellationToken token = default) where TEntity : class;
+        Task<int> RefreshMaterializedViewAsync(string mwName, CancellationToken token);
+        Task<int> RefreshMaterializedViewAsync<TEntity>(CancellationToken token) where TEntity : class;
         int SaveChanges();
         int SaveChanges(bool acceptAllChangesOnSuccess);
         Task<int> SaveChangesAsync(CancellationToken cancellationToken);
diff --git a/AsbCloudInfrastructure/Repository/CrudCacheServiceBase.cs b/AsbCloudInfrastructure/Repository/CrudCacheServiceBase.cs
index 142367ec..94142e9d 100644
--- a/AsbCloudInfrastructure/Repository/CrudCacheServiceBase.cs
+++ b/AsbCloudInfrastructure/Repository/CrudCacheServiceBase.cs
@@ -9,6 +9,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Repository
 {
+#nullable enable
     /// <summary>
     /// CRUD сервис с кешем в оперативке
     /// </summary>
diff --git a/AsbCloudInfrastructure/Repository/CrudServiceBase.cs b/AsbCloudInfrastructure/Repository/CrudServiceBase.cs
index 3163d86e..15c8dc4f 100644
--- a/AsbCloudInfrastructure/Repository/CrudServiceBase.cs
+++ b/AsbCloudInfrastructure/Repository/CrudServiceBase.cs
@@ -10,7 +10,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Repository
 {
-
+#nullable enable
     /// <summary>
     /// CRUD сервис для работы с БД
     /// </summary>
diff --git a/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs b/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
index 221e5d3c..09c06643 100644
--- a/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
+++ b/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
@@ -126,7 +126,7 @@ namespace AsbCloudInfrastructure.Services.DailyReport
             var dto = new DailyReportDto()
             {
                 ReportDate = date,
-                WellName = well.Caption,
+                WellName = well!.Caption,
                 ClusterName = well.Cluster,
             };
             DailyReportDto result = dto;
diff --git a/AsbCloudInfrastructure/Services/DetectOperations/OperationDetectionBackgroundService.cs b/AsbCloudInfrastructure/Services/DetectOperations/OperationDetectionBackgroundService.cs
index 2e44e1e8..7c2f73af 100644
--- a/AsbCloudInfrastructure/Services/DetectOperations/OperationDetectionBackgroundService.cs
+++ b/AsbCloudInfrastructure/Services/DetectOperations/OperationDetectionBackgroundService.cs
@@ -12,6 +12,7 @@ using AsbCloudInfrastructure.Services.DetectOperations.Detectors;
 
 namespace AsbCloudInfrastructure.Services.DetectOperations
 {
+#nullable enable
     public class OperationDetectionBackgroundService : BackgroundService
     {
         private readonly string connectionString;
@@ -116,12 +117,12 @@ namespace AsbCloudInfrastructure.Services.DetectOperations
                 {
                     DateTime = d.DateTime,
                     IdUser = d.IdUser,
-                    WellDepth = (float)d.WellDepth,
-                    Pressure = (float)d.Pressure,
-                    HookWeight = (float)d.HookWeight,
-                    BlockPosition = (float)d.BlockPosition,
-                    BitDepth = (float)d.BitDepth,
-                    RotorSpeed = (float)d.RotorSpeed,
+                    WellDepth = d.WellDepth ?? float.NaN,
+                    Pressure = d.Pressure ?? float.NaN,
+                    HookWeight = d.HookWeight ?? float.NaN,
+                    BlockPosition = d.BlockPosition ?? float.NaN,
+                    BitDepth = d.BitDepth ?? float.NaN,
+                    RotorSpeed = d.RotorSpeed ?? float.NaN,
                 })
                 .OrderBy(d => d.DateTime);
 
@@ -150,9 +151,9 @@ namespace AsbCloudInfrastructure.Services.DetectOperations
                 {
                     for (int i = 0; i < detectors.Length; i++)
                     {
-                        if (detectors[i].TryDetect(idTelemetry, data, positionBegin, positionEnd, lastDetectedOperation, out OperationDetectorResult result))
+                        if (detectors[i].TryDetect(idTelemetry, data, positionBegin, positionEnd, lastDetectedOperation, out OperationDetectorResult? result))
                         {
-                            detectedOperations.Add(result.Operation);
+                            detectedOperations.Add(result!.Operation);
                             lastDetectedOperation = result.Operation;
                             isDetected = true;
                             positionBegin = result.TelemetryEnd;
@@ -163,7 +164,7 @@ namespace AsbCloudInfrastructure.Services.DetectOperations
                 }
 
                 if (isDetected)
-                    startDate = lastDetectedOperation.DateEnd;
+                    startDate = lastDetectedOperation!.DateEnd;
                 else
                     startDate = data[positionEnd].DateTime;
             }
@@ -171,4 +172,5 @@ namespace AsbCloudInfrastructure.Services.DetectOperations
             return detectedOperations;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs b/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
index 67f4e8fc..9ad570b4 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
@@ -12,6 +12,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services.WellOperationService
 {
+#nullable enable
     public class WellOperationService : IWellOperationService
     {
         private readonly IAsbCloudDbContext db;
@@ -219,4 +220,5 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
                 .ConfigureAwait(false);
         }
     }
+#nullable disable
 }