diff --git a/PIbd-23_Gutorov_I.A._IT-Company/PIbd-23_Gutorov_I.A._IT-Company.csproj b/PIbd-23_Gutorov_I.A._IT-Company/PIbd-23_Gutorov_I.A._IT-Company.csproj
index a3a964f..b1e209f 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/PIbd-23_Gutorov_I.A._IT-Company.csproj
+++ b/PIbd-23_Gutorov_I.A._IT-Company/PIbd-23_Gutorov_I.A._IT-Company.csproj
@@ -15,6 +15,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Npgsql" Version="9.0.1" />
     <PackageReference Include="Serilog" Version="4.1.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.4" />
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ConnectionString.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ConnectionString.cs
index c4b3c3f..d5afdbc 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ConnectionString.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ConnectionString.cs
@@ -8,5 +8,5 @@ namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
 
 public class ConnectionString : IConnectionString
 {
-    string IConnectionString.ConnectionString => "";
+    string IConnectionString.ConnectionString => "Host=localhost;Port=5432;Username=postgres;Password=postgres;Database=OTP";
 }
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ContractRepository.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ContractRepository.cs
index 04e2130..e1c6667 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ContractRepository.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ContractRepository.cs
@@ -1,6 +1,7 @@
 using Dapper;
 using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
+using Npgsql;
 using System.Data.SqlClient;
 
 namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
@@ -24,11 +25,11 @@ public class ContractRepository : IContractRepository
 
         try
         {
-            using var connection = new SqlConnection(_connectionString.ConnectionString);
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
             connection.Open();
             var queryInsert = @"
-INSERT INTO Contracts (CustomerId, ExecutorId, Category, ConclusionDate, Deadline, PaymentAmount) 
-VALUES (@CustomerId, @ExecutorId, @Category, @ConclusionDate, @Deadline, @PaymentAmount)";
+                INSERT INTO Contracts (CustomerId, ExecutorId, Category, ConclusionDate, Deadline, PaymentAmount) 
+                VALUES (@CustomerId, @ExecutorId, @Category, @ConclusionDate, @Deadline, @PaymentAmount)";
             connection.Execute(queryInsert, contract);
         }
         catch (Exception ex)
@@ -45,11 +46,11 @@ VALUES (@CustomerId, @ExecutorId, @Category, @ConclusionDate, @Deadline, @Paymen
 
         try
         {
-            using var connection = new SqlConnection(_connectionString.ConnectionString);
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
             connection.Open();
             var queryDelete = @"
-DELETE FROM Contracts
-WHERE Id=@id";
+                DELETE FROM Contracts
+                WHERE Id = @id";
             connection.Execute(queryDelete, new { id });
         }
         catch (Exception ex)
@@ -65,7 +66,7 @@ WHERE Id=@id";
 
         try
         {
-            using var connection = new SqlConnection(_connectionString.ConnectionString);
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
             connection.Open();
             var querySelect = @"SELECT * FROM Contracts";
             var contracts = connection.Query<Entities.Contract>(querySelect);
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerExecutorReviewRepository.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerExecutorReviewRepository.cs
index ebd6a67..24d341a 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerExecutorReviewRepository.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerExecutorReviewRepository.cs
@@ -1,9 +1,13 @@
-using PIbd_23_Gutorov_I.A._IT_Company.Entities;
+using Microsoft.Extensions.Logging;
+using PIbd_23_Gutorov_I.A._IT_Company.Entities;
 
 namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
 
 public class CustomerExecutorReviewRepository : ICustomerExecutorReviewRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<CustomerExecutorReviewRepository> _logger;
+
     public void CreateCustomerExecutorReview(CustomerExecutorReview customerContractReview)
     {
     }
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerRepository.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerRepository.cs
index 618d76a..1f3ba11 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerRepository.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/CustomerRepository.cs
@@ -1,28 +1,125 @@
-using PIbd_23_Gutorov_I.A._IT_Company.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using PIbd_23_Gutorov_I.A._IT_Company.Entities;
 
 namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
 
 public class CustomerRepository : ICustomerRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<CustomerRepository> _logger;
+
+    public CustomerRepository(IConnectionString connectionString, ILogger<CustomerRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void CreateCustomer(Customer customer)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(customer));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+                INSERT INTO Customers (Name, Contact, Address)
+                VALUES (@Name, @Contact, @Address);
+            ";
+            connection.Execute(queryInsert, customer);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public void DeleteCustomer(int id)
     {
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Customers WHERE Id = @Id;
+            ";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 
     public Customer ReadCustomerById(int id)
     {
-        return Customer.CreateEntity(0, string.Empty, string.Empty, string.Empty);
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Customers WHERE Id = @Id;
+            ";
+            var customer = connection.QueryFirst<Customer>(querySelect, new { id });
+            _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(customer));
+            return customer;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Customer> ReadCustomers()
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Customers;
+            ";
+            var customers = connection.Query<Customer>(querySelect);
+            _logger.LogDebug("Полученные объекты: {json}", JsonConvert.SerializeObject(customers));
+            return customers;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 
     public void UpdateCustomer(Customer customer)
     {
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(customer));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Customers
+                SET Name = @Name, Contact = @Contact, Address = @Address
+                WHERE Id = @Id;
+            ";
+            connection.Execute(queryUpdate, customer);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
 }
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ExecutorRepository.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ExecutorRepository.cs
index 6533fc8..e1130a8 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ExecutorRepository.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ExecutorRepository.cs
@@ -1,9 +1,13 @@
-using PIbd_23_Gutorov_I.A._IT_Company.Entities;
+using Microsoft.Extensions.Logging;
+using PIbd_23_Gutorov_I.A._IT_Company.Entities;
 
 namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
 
 public class ExecutorRepository : IExecutorRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<ExecutorRepository> _logger;
+
     public void CreateExecutor(Executor executor)
     {
     }
diff --git a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ServiceRepository.cs b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ServiceRepository.cs
index 1c4d86a..c3af217 100644
--- a/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ServiceRepository.cs
+++ b/PIbd-23_Gutorov_I.A._IT-Company/Repositories/Implementations/ServiceRepository.cs
@@ -1,28 +1,125 @@
-using PIbd_23_Gutorov_I.A._IT_Company.Entities;
+using Dapper;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Npgsql;
+using PIbd_23_Gutorov_I.A._IT_Company.Entities;
 
 namespace PIbd_23_Gutorov_I.A._IT_Company.Repositories.Implementations;
 
 internal class ServiceRepository : IServiceRepository
 {
+    private readonly IConnectionString _connectionString;
+    private readonly ILogger<ServiceRepository> _logger;
+
+    public ServiceRepository(IConnectionString connectionString, ILogger<ServiceRepository> logger)
+    {
+        _connectionString = connectionString;
+        _logger = logger;
+    }
+
     public void CreateService(Service service)
     {
+        _logger.LogInformation("Добавление объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(service));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+                INSERT INTO Services (Description, ContractId)
+                VALUES (@Description, @ContractId);
+            ";
+            connection.Execute(queryInsert, service);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при добавлении объекта");
+            throw;
+        }
     }
 
     public void DeleteService(int id)
     {
+        _logger.LogInformation("Удаление объекта");
+        _logger.LogDebug("Объект: {id}", id);
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryDelete = @"
+                DELETE FROM Services WHERE Id = @Id;
+            ";
+            connection.Execute(queryDelete, new { id });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при удалении объекта");
+            throw;
+        }
     }
 
     public Service ReadServiceById(int id)
     {
-        return Service.CreateEntity(0, string.Empty, 0);
+        _logger.LogInformation("Получение объекта по идентификатору");
+        _logger.LogDebug("Объект: {id}", id);
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var querySelect = @"
+                SELECT * FROM Services WHERE Id = @Id;
+            ";
+            var service = connection.QueryFirst<Service>(querySelect, new { id });
+            _logger.LogDebug("Найденный объект: {json}", JsonConvert.SerializeObject(service));
+            return service;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при поиске объекта");
+            throw;
+        }
     }
 
     public IEnumerable<Service> ReadServices(int? contractId = null)
     {
-        return [];
+        _logger.LogInformation("Получение всех объектов");
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryInsert = @"
+                SELECT * FROM Services;
+            ";
+            var services = connection.Query<Service>(queryInsert);
+            _logger.LogDebug("Полученные объекты: {json}", JsonConvert.SerializeObject(services));
+            return services;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при чтении объектов");
+            throw;
+        }
     }
 
     public void UpdateService(Service service)
     {
+        _logger.LogInformation("Редактирование объекта");
+        _logger.LogDebug("Объект: {json}", JsonConvert.SerializeObject(service));
+
+        try
+        {
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
+            var queryUpdate = @"
+                UPDATE Services
+                SET Description = @Description, ContractId = @ContractId
+                WHERE Id = @Id;
+            ";
+            connection.Execute(queryUpdate, service);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Ошибка при редактировании объекта");
+            throw;
+        }
     }
 }