diff --git a/AsbCloudDb/Model/AsbCloudDbContext.cs b/AsbCloudDb/Model/AsbCloudDbContext.cs
index 48905e92..221363d0 100644
--- a/AsbCloudDb/Model/AsbCloudDbContext.cs
+++ b/AsbCloudDb/Model/AsbCloudDbContext.cs
@@ -482,7 +482,7 @@ namespace AsbCloudDb.Model
                               {
                                   From = g.Min(d => d.Date),
                                   To = g.Max(d => d.Date)
-                              }).FirstOrDefault();
+                              }).AsNoTracking().FirstOrDefault();
 
             if (datesRange is null)
                 return (DateTime.MinValue, DateTime.MaxValue);
diff --git a/AsbCloudInfrastructure/Services/AnalyticsService.cs b/AsbCloudInfrastructure/Services/AnalyticsService.cs
index efdc74ec..24211480 100644
--- a/AsbCloudInfrastructure/Services/AnalyticsService.cs
+++ b/AsbCloudInfrastructure/Services/AnalyticsService.cs
@@ -57,7 +57,7 @@ namespace AsbCloudInfrastructure.Services
                 WellDepth = d.WellDepth ?? 0.0,
                 BitDepth = d.BitDepth ?? 0.0,
                 Date = d.Date
-            }).ToList();
+            }).AsNoTracking().ToList();
         }
 
         public IEnumerable<WellDepthToIntervalDto> GetWellDepthToInterval(int idWell,
@@ -125,7 +125,7 @@ namespace AsbCloudInfrastructure.Services
             if (skip > 0)
                 operations = operations.Skip(skip);
 
-            var operationsList = operations.Take(take).ToList();
+            var operationsList = operations.Take(take).AsNoTracking().ToList();
 
             if (operationsList.Count == 0)
                 return result;
@@ -169,7 +169,7 @@ namespace AsbCloudInfrastructure.Services
                                   OperationName = g.Key.Name,
                                   Duration = g.Where(g => g.DurationSec > 0)
                                                 .Sum(a => a.DurationSec)
-                              }).ToList();
+                              }).AsNoTracking().ToList();
 
             return operations;
         }
@@ -200,7 +200,7 @@ namespace AsbCloudInfrastructure.Services
                                   IntervalStart = g.Min(d => d.UnixDate),
                                   OperationName = g.Key.Name,
                                   OperationsDuration = g.Sum(an => an.DurationSec)
-                              }).ToList();
+                              }).AsNoTracking().ToList();
 
             var operationsGroupedByInterval = operations.GroupBy(op => op.IntervalStart)
                                                         .Select(o => new TelemetryOperationInfoDto
diff --git a/AsbCloudInfrastructure/Services/AuthService.cs b/AsbCloudInfrastructure/Services/AuthService.cs
index 97a6ceaf..3ef8028d 100644
--- a/AsbCloudInfrastructure/Services/AuthService.cs
+++ b/AsbCloudInfrastructure/Services/AuthService.cs
@@ -9,6 +9,7 @@ using System.Linq;
 using System.Security.Claims;
 using System.Security.Cryptography;
 using System.Text;
+using Microsoft.EntityFrameworkCore;
 
 namespace AsbCloudInfrastructure.Services
 {
@@ -97,7 +98,7 @@ namespace AsbCloudInfrastructure.Services
 
         public int ChangePassword(string userLogin, string newPassword)
         {
-            var user = db.Users.FirstOrDefault(u => u.Login == userLogin);
+            var user = db.Users.AsNoTracking().FirstOrDefault(u => u.Login == userLogin);
             if (user == null)
                 return -1;
 
@@ -138,6 +139,7 @@ namespace AsbCloudInfrastructure.Services
         {
             var user = db
                 .GetUsersByLogin(login)
+                .AsNoTracking()
                 .FirstOrDefault();
 
             if (user is null)
diff --git a/AsbCloudInfrastructure/Services/ClusterService.cs b/AsbCloudInfrastructure/Services/ClusterService.cs
index 1ae8c076..ef71692f 100644
--- a/AsbCloudInfrastructure/Services/ClusterService.cs
+++ b/AsbCloudInfrastructure/Services/ClusterService.cs
@@ -24,7 +24,7 @@ namespace AsbCloudInfrastructure.Services
                 .Include(w => w.Cluster)
                 .ThenInclude(c => c.Deposit)
                                 where well.RelationCompaniesWells.Any(r => r.IdCompany == idCompany)
-                                select well).ToList();
+                                select well).AsNoTracking().ToList();
 
             var gDepositEntities = wellEntities
                 .GroupBy(w => w.Cluster)
@@ -65,6 +65,7 @@ namespace AsbCloudInfrastructure.Services
             var entities = db.GetWellsForCompany(idCompany)
                         .Select(e => e.Cluster)
                         .Distinct()
+                        .AsNoTracking()
                         .ToList();
 
             var dtos = entities.Select(e => new ClusterDto
@@ -84,6 +85,7 @@ namespace AsbCloudInfrastructure.Services
                         .Select(e => e.Cluster)
                         .Where(e => e.IdDeposit == depositId)
                         .Distinct()
+                        .AsNoTracking()
                         .ToList();
 
             var dtos = entities.Select(e => new ClusterDto
@@ -101,6 +103,7 @@ namespace AsbCloudInfrastructure.Services
         {
             var entities = db.GetWellsForCompany(idCompany)
                 .Where(e => e.IdCluster == idCluster)
+                .AsNoTracking()
                 .ToList();
 
             var dtos = entities.Select(e => new WellDto
@@ -164,12 +167,12 @@ namespace AsbCloudInfrastructure.Services
                     CompanyType = c.Company.CompanyType.Caption,
                 }),
                 WellType = e.WellType.Caption,
-            }).ToList();
+            }).AsNoTracking().ToList();
 
             if (!wellStatDtos.Any())
                 return null;
 
-            var clusterById = db.Clusters.FirstOrDefault(c => c.Id == idCluster);
+            var clusterById = db.Clusters.AsNoTracking().FirstOrDefault(c => c.Id == idCluster);
 
             return new ClusterStatDto
             {
diff --git a/AsbCloudInfrastructure/Services/CrudServiceBase.cs b/AsbCloudInfrastructure/Services/CrudServiceBase.cs
index 4cfab609..f7e4fed5 100644
--- a/AsbCloudInfrastructure/Services/CrudServiceBase.cs
+++ b/AsbCloudInfrastructure/Services/CrudServiceBase.cs
@@ -24,7 +24,8 @@ namespace AsbCloudInfrastructure.Services
 
         public virtual async Task<Tdto> GetAsync(int id, CancellationToken token = default)
         {
-            var entity = await dbSet.FirstOrDefaultAsync(e => e.Id == id, token).ConfigureAwait(false);
+            var entity = await dbSet.AsNoTracking()
+                .FirstOrDefaultAsync(e => e.Id == id, token).ConfigureAwait(false);
             var dto = entity.Adapt<Tdto>();
             return dto;
         }
@@ -59,7 +60,8 @@ namespace AsbCloudInfrastructure.Services
 
         public virtual Task<int> DeleteAsync(int id, CancellationToken token = default)
         {
-            var entity = dbSet.FirstOrDefault(e => e.Id == id);
+            var entity = dbSet.AsNoTracking()
+                .FirstOrDefault(e => e.Id == id);
             if (entity == default)
                 return Task.FromResult(0);
             dbSet.Remove(entity);
@@ -68,7 +70,7 @@ namespace AsbCloudInfrastructure.Services
 
         public virtual Task<int> DeleteAsync(IEnumerable<int> ids, CancellationToken token = default)
         {
-            var entities = dbSet.Where(e => ids.Contains(e.Id));
+            var entities = dbSet.Where(e => ids.Contains(e.Id)).AsNoTracking();
             if (entities == default)
                 return Task.FromResult(0);
             dbSet.RemoveRange(entities);
diff --git a/AsbCloudInfrastructure/Services/DataService.cs b/AsbCloudInfrastructure/Services/DataService.cs
index 1181253c..2a317cda 100644
--- a/AsbCloudInfrastructure/Services/DataService.cs
+++ b/AsbCloudInfrastructure/Services/DataService.cs
@@ -1,6 +1,7 @@
 using AsbCloudApp.Data;
 using AsbCloudApp.Services;
 using AsbCloudDb.Model;
+using Microsoft.EntityFrameworkCore;
 using AsbCloudInfrastructure.Services.Cache;
 using Mapster;
 using System;
@@ -59,7 +60,7 @@ namespace AsbCloudInfrastructure.Services
                     query = query.Where(d => d.Id % m == 0);
             }
 
-            var entities = query.ToList();
+            var entities = query.AsNoTracking().ToList();
 
             var dtos = entities.Adapt<DataSaubBaseDto>();
 
@@ -79,7 +80,7 @@ namespace AsbCloudInfrastructure.Services
                                    where d.IdTelemetry == telemetryId
                                        && d.Date > dtoMinDate
                                        && d.Date < dtoMaxDate
-                                   select d).ToList();
+                                   select d).AsNoTracking().ToList();
 
             if (oldDataSaubBase.Any())
                 db.DataSaubBases.RemoveRange(oldDataSaubBase);
diff --git a/AsbCloudInfrastructure/Services/FileService.cs b/AsbCloudInfrastructure/Services/FileService.cs
index 5fcd953b..daa2efb9 100644
--- a/AsbCloudInfrastructure/Services/FileService.cs
+++ b/AsbCloudInfrastructure/Services/FileService.cs
@@ -49,7 +49,7 @@ namespace AsbCloudInfrastructure.Services
         {
             var filesInfoQuery = db.Files.Include(f => f.User)
                 .Where(f => f.IdWell == idWell &&
-                f.IdCategory == idCategory);
+                f.IdCategory == idCategory).AsNoTracking();
 
             if (!filesInfoQuery.Any())
                 return null;
@@ -57,15 +57,15 @@ namespace AsbCloudInfrastructure.Services
             var result = new PaginationContainer<FilePropertiesDto>() { Skip = skip, Take = take };
 
             if (begin != default)
-                filesInfoQuery = filesInfoQuery.Where(m => m.Date >= begin);
+                filesInfoQuery = filesInfoQuery.Where(m => m.Date >= begin).AsNoTracking();
 
             if (end != default)
-                filesInfoQuery = filesInfoQuery.Where(m => m.Date <= end);
+                filesInfoQuery = filesInfoQuery.Where(m => m.Date <= end).AsNoTracking();
 
             result.Count = filesInfoQuery.Count();
 
             if (skip > 0)
-                filesInfoQuery = filesInfoQuery.Skip(skip);
+                filesInfoQuery = filesInfoQuery.Skip(skip).AsNoTracking();
 
             var filesInfoList = filesInfoQuery.OrderBy(f => f.Date).Take(take).ToList();
 
@@ -91,7 +91,7 @@ namespace AsbCloudInfrastructure.Services
 
         public (int Id, string Name, int IdCategory)? GetFileInfo(int fileId)
         {
-            var fileInfo = db.Files.FirstOrDefault(f => f.Id == fileId);
+            var fileInfo = db.Files.AsNoTracking().FirstOrDefault(f => f.Id == fileId);
 
             if (fileInfo is null)
                 return null;
diff --git a/AsbCloudInfrastructure/Services/LastDataService.cs b/AsbCloudInfrastructure/Services/LastDataService.cs
index 02c0ce2d..66aa3119 100644
--- a/AsbCloudInfrastructure/Services/LastDataService.cs
+++ b/AsbCloudInfrastructure/Services/LastDataService.cs
@@ -3,6 +3,7 @@ using AsbCloudDb.Model;
 using Mapster;
 using System.Linq;
 using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
 
 namespace AsbCloudInfrastructure.Services
 {
@@ -17,7 +18,7 @@ namespace AsbCloudInfrastructure.Services
 
         public Tdto Get(int idWell, int idCategory)
         {
-            var entity = db.LastData.FirstOrDefault(e =>
+            var entity = db.LastData.AsNoTracking().FirstOrDefault(e =>
                 e.IdWell == idWell && e.IdCategory == idCategory);
 
             if (entity is null)
@@ -31,7 +32,8 @@ namespace AsbCloudInfrastructure.Services
         {
             var model = value.Adapt<TModel>();
 
-            var entity = db.LastData.FirstOrDefault(ld => ld.IdWell == idWell &&
+            var entity = db.LastData.AsNoTracking()
+                .FirstOrDefault(ld => ld.IdWell == idWell &&
                 ld.IdCategory == idCategory);
 
             if (entity is not null)
diff --git a/AsbCloudInfrastructure/Services/MessageService.cs b/AsbCloudInfrastructure/Services/MessageService.cs
index 40bfd9f6..0a07706d 100644
--- a/AsbCloudInfrastructure/Services/MessageService.cs
+++ b/AsbCloudInfrastructure/Services/MessageService.cs
@@ -79,7 +79,7 @@ namespace AsbCloudInfrastructure.Services
             if (skip > 0)
                 query = query.Skip(skip);
 
-            var messagesList = query.Take(take).ToList();
+            var messagesList = query.Take(take).AsNoTracking().ToList();
 
             if (messagesList.Count == 0)
                 return result;
diff --git a/AsbCloudInfrastructure/Services/ReportService.cs b/AsbCloudInfrastructure/Services/ReportService.cs
index 98af558d..9b546c5d 100644
--- a/AsbCloudInfrastructure/Services/ReportService.cs
+++ b/AsbCloudInfrastructure/Services/ReportService.cs
@@ -29,7 +29,8 @@ namespace AsbCloudInfrastructure.Services
             this.telemetryService = telemetryService;
             this.fileService = fileService;
             this.queue = queue;
-            ReportCategoryId = db.FileCategories.FirstOrDefault(c =>
+            ReportCategoryId = db.FileCategories.AsNoTracking()
+                .FirstOrDefault(c =>
                 c.Name.Equals("Рапорт")).Id;
         }
 
@@ -121,12 +122,15 @@ namespace AsbCloudInfrastructure.Services
                               select d.Date).Union(
                                 from m in db.TelemetryMessages
                                 where m.IdTelemetry == telemetryId
-                                select m.Date).DefaultIfEmpty().GroupBy(g => true)
+                                select m.Date).DefaultIfEmpty()
+                                .GroupBy(g => true)
+                                .AsNoTracking()
                                 .Select(g => new
                                 {
                                     From = g.Min(),
                                     To = g.Max()
-                                }).OrderBy(gr => gr.From).FirstOrDefault();
+                                }).OrderBy(gr => gr.From)
+                                .FirstOrDefault();
 
             return new DatesRangeDto
             {
@@ -144,6 +148,7 @@ namespace AsbCloudInfrastructure.Services
                                         && r.Step <= stepSeconds
                                         && r.Format == format
                                         select r).OrderBy(o => o.File.Date)
+                                        .AsNoTracking()
                                         .Take(512).ToList();
 
             return suitableReportsNames;
diff --git a/AsbCloudInfrastructure/Services/WellSectionService.cs b/AsbCloudInfrastructure/Services/WellSectionService.cs
index 6fdbeb79..cfb55f77 100644
--- a/AsbCloudInfrastructure/Services/WellSectionService.cs
+++ b/AsbCloudInfrastructure/Services/WellSectionService.cs
@@ -4,7 +4,6 @@ using AsbCloudDb.Model;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
 using Mapster;
 using Microsoft.EntityFrameworkCore;
 using System.Threading.Tasks;
diff --git a/AsbCloudInfrastructure/Services/WellService.cs b/AsbCloudInfrastructure/Services/WellService.cs
index 42b79983..e0e42a5f 100644
--- a/AsbCloudInfrastructure/Services/WellService.cs
+++ b/AsbCloudInfrastructure/Services/WellService.cs
@@ -6,6 +6,7 @@ using Mapster;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.EntityFrameworkCore;
 
 namespace AsbCloudInfrastructure.Services
 {
@@ -30,6 +31,7 @@ namespace AsbCloudInfrastructure.Services
             {
                 wells = db.GetWellsForCompany(idCompany)
                     .Where(w => activeTelemetriesUids.Contains(w.Telemetry.RemoteUid))
+                    .AsNoTracking()
                     .ToList();
             }
             return wells.Select(w => From(w));
@@ -49,6 +51,7 @@ namespace AsbCloudInfrastructure.Services
             var entities = db
                 .WellOperations
                 .Where(o => o.IdWell == idWell)
+                .AsNoTracking()
                 .ToList();
 
             var dtos = entities.Adapt<WellOperationDto>();