.gitignore

@@ -0,0 +1,5 @@
+.idea/
+.vs/
+.vscode/
+[Bb]in/
+[Oo]bj/

Presence.API/Controllers/AdminController.cs

@@ -0,0 +1,38 @@
+using domain.UseCase;
+using domain.Request;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Presence.API.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class AdminController : ControllerBase
+    {
+        private readonly IAdminUseCase _adminUseCase;
+
+        public AdminController(IAdminUseCase adminUseCase)
+        {
+            _adminUseCase = adminUseCase;
+        }
+
+        [HttpPost("/group/{groupId}/students")]
+        public IActionResult AddStudentsToGroup(int groupId, [FromBody] AddStudentsToGroupRequest request)
+        {
+            if (request?.Students == null)
+                return BadRequest();
+
+            _adminUseCase.AddStudentsToGroup(groupId, request);
+            return NoContent();
+        }
+
+        [HttpPost("/group/{groupId}/subjects")]
+        public IActionResult AddSubjectsToGroup(int groupId, [FromBody] AddSubjectsToGroupRequest request)
+        {
+            if (request?.Subjects == null)
+                return BadRequest();
+
+            _adminUseCase.AddSubjectsToGroup(groupId, request);
+            return NoContent();
+        }
+    }
+}

Presence.API/Controllers/GroupController.cs

@@ -0,0 +1,98 @@
+using domain.Request;
+using domain.UseCase;
+using Microsoft.AspNetCore.Mvc;
+using Presence.API.Response;
+
+namespace Presence.API.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class GroupController : ControllerBase
+    {
+        private readonly IGroupUseCase _groupService;
+
+        public GroupController(IGroupUseCase groupService)
+        {
+            _groupService = groupService;
+        }
+
+        [HttpGet("/group")]
+        public ActionResult<GroupResponse> GetAllGroups()
+        {
+            var result = _groupService
+                .GetGroupsWithStudents()
+                .Select(group => new GroupResponse
+                {
+                    Id = group.Id,
+                    Name = group.Name,
+                    Users = group.Users?.Select(
+                        user => new UserResponse
+                        {
+                            Id = user.Id,
+                            LastName = user.LastName,
+                            FirstName = user.FirstName,
+                            Patronymic = user.Patronymic
+                        }).ToList()
+                }).ToList();
+            return Ok(result);
+        }
+
+        [HttpDelete("/group/{id}")]
+        public IActionResult DeleteGroup(int id)
+        {
+            RemoveGroupRequest removeGroupRequest = new() { GroupId = id };
+            bool isDeleted = _groupService.RemoveGroup(removeGroupRequest);
+            if (!isDeleted) return NotFound();
+            else return NoContent();
+        }
+
+        [HttpPost("/group")]
+        public ActionResult<GroupResponse> PostGroup(AddGroupRequest addGroupRequest)
+        {
+            if (addGroupRequest is null)
+                return BadRequest(new ArgumentNullException());
+
+            var groupWithStudentsRequest = new AddGroupWithStudentRequest
+            {
+                AddGroupRequest = new AddGroupRequest { Name = addGroupRequest.Name },
+                AddStudentRequests = addGroupRequest.Students
+            };
+
+            _groupService.AddGroupWithStudents(groupWithStudentsRequest);
+            
+            var createdGroup = _groupService.GetGroupsWithStudents()
+                .FirstOrDefault(g => g.Name == addGroupRequest.Name);
+                
+            return CreatedAtAction(nameof(GetGroupById), new { id = createdGroup.Id }, createdGroup);
+        }
+
+        [HttpGet("/group/{id:int}")]
+        public ActionResult<GroupResponse> GetGroupById(int id)
+        {
+            var group = _groupService.GetGroupsWithStudents().FirstOrDefault(g => g.Id == id);
+            if (group == null)
+                return NotFound();
+
+            var response = new GroupResponse
+            {
+                Id = group.Id,
+                Name = group.Name,
+                Users = group.Users?.Select(
+                    user => new UserResponse
+                    {
+                        Id = user.Id,
+                        LastName = user.LastName,
+                        FirstName = user.FirstName,
+                        Patronymic = user.Patronymic
+                    }).ToList()
+            };
+            return Ok(response);
+        }
+
+        [HttpGet("/group/{id}/subjects")]
+        public ActionResult<GroupSubjectResponse> GetGroupSubject(int id)
+        {
+            return Ok(_groupService.GetGroupSubject(id));
+        }
+    }
+}

Presence.API/Controllers/PresenceController.cs

@@ -0,0 +1,101 @@
+using domain.UseCase;
+using Microsoft.AspNetCore.Mvc;
+using Presence.API.Response;
+using domain.Request;
+using System;
+using System.Linq;
+
+namespace Presence.API.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class PresenceController : ControllerBase
+    {
+        private readonly IPresenceUseCase _presenceUseCase;
+
+        public PresenceController(IPresenceUseCase presenceUseCase)
+        {
+            _presenceUseCase = presenceUseCase;
+        }
+
+        [HttpGet("/presence/{groupId}")]
+        public ActionResult<IEnumerable<PresenceResponse>> GetPresence(
+            int groupId,
+            [FromQuery] int? subject,
+            [FromQuery] DateOnly? date,
+            [FromQuery] int? student)
+        {
+            var presences = _presenceUseCase.GetPresence(groupId, subject, date, student)
+                .Select(p => new PresenceResponse
+                {
+                    Id = p.Id,
+                    StudentId = p.StudentId,
+                    StudentName = $"{p.Student.LastName} {p.Student.FirstName} {p.Student.Patronymic}",
+                    SubjectId = p.SubjectId,
+                    SubjectName = p.Subject.Name,
+                    TrafficId = p.TrafficId,
+                    TrafficName = p.Traffic.Name,
+                    LessonNumber = p.LessonNumber,
+                    Date = p.Date
+                })
+                .ToList();
+
+            return Ok(presences);
+        }
+
+        [HttpPost("/presence")]
+        public IActionResult AddPresenceRecords([FromBody] AddPresenceRequest request)
+        {
+            if (!ModelState.IsValid)
+                return BadRequest(ModelState);
+
+            try
+            {
+                _presenceUseCase.AddPresenceRecords(request);
+                return Ok();
+            }
+            catch (ArgumentException ex)
+            {
+                return BadRequest(ex.Message);
+            }
+        }
+
+        [HttpPut("/presence")]
+        public IActionResult UpdatePresenceRecords([FromBody] UpdatePresenceRequest request)
+        {
+            if (!ModelState.IsValid)
+                return BadRequest(ModelState);
+
+            try
+            {
+                _presenceUseCase.UpdatePresenceRecords(request);
+                return Ok();
+            }
+            catch (ArgumentException ex)
+            {
+                return BadRequest(ex.Message);
+            }
+        }
+
+        [HttpDelete("/presence")]
+        public IActionResult DeleteAllPresence()
+        {
+            _presenceUseCase.DeleteAllPresence();
+            return NoContent();
+        }
+
+        [HttpDelete("/presence/group")]
+        public IActionResult DeleteGroupPresence([FromQuery] int? group)
+        {
+            if (!group.HasValue)
+            {
+                _presenceUseCase.DeleteAllPresence();
+            }
+            else
+            {
+                _presenceUseCase.DeleteGroupPresence(group.Value);
+            }
+            return NoContent();
+        }
+    }
+}

Presence.API/Extensions/ServiceCollectionExtension.cs

@@ -0,0 +1,32 @@
+using data;
+using data.Repository;
+using domain.Service;
+using domain.UseCase;
+using Presence.API.Controllers;
+
+namespace Presence.API.Extensions
+{
+    public static class ServiceCollectionExtension
+    {
+        public static void AddCommonServices(this IServiceCollection services)
+        {
+            services
+                .AddDbContext<DatabaseContext>()
+                .AddScoped<IGroupRepository, SQLGroupRepository>()
+                .AddScoped<IGroupUseCase, GroupService>()
+                .AddScoped<GroupController>();
+
+            services
+                .AddDbContext<DatabaseContext>()
+                .AddScoped<IAdminRepository, SQLAdminRepository>()
+                .AddScoped<IAdminUseCase, AdminService>()
+                .AddScoped<AdminController>();
+
+            services
+                .AddDbContext<DatabaseContext>()
+                .AddScoped<IPresenceRepository, SQLPresenceRepository>()
+                .AddScoped<IPresenceUseCase, PresenceService>()
+                .AddScoped<PresenceController>();
+        }
+    }
+}

Presence.API/Presence.API.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\data\data.csproj" />
+    <ProjectReference Include="..\domain\domain.csproj" />
+  </ItemGroup>
+
+</Project>

Presence.API/Presence.API.csproj.user

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <ActiveDebugProfile>https</ActiveDebugProfile>
+  </PropertyGroup>
+</Project>

Presence.API/Presence.API.http

@@ -0,0 +1,6 @@
+@Presence.API_HostAddress = http://localhost:5275
+
+GET {{Presence.API_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

Presence.API/Program.cs

@@ -0,0 +1,38 @@
+
+using Presence.API.Extensions;
+
+namespace Presence.API
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var builder = WebApplication.CreateBuilder(args);
+
+            // Add services to the container.
+            builder.Services.AddCommonServices();
+            builder.Services.AddControllers();
+            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+            builder.Services.AddEndpointsApiExplorer();
+            builder.Services.AddSwaggerGen();
+
+
+            var app = builder.Build();
+
+            // Configure the HTTP request pipeline.
+            if (app.Environment.IsDevelopment())
+            {
+                app.UseSwagger();
+                app.UseSwaggerUI();
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseAuthorization();
+
+            app.MapControllers();
+
+            app.Run();
+        }
+    }
+}

Presence.API/Properties/launchSettings.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:56416",
+      "sslPort": 44345
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5275",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7226;http://localhost:5275",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Presence.API/Response/GroupResponse.cs

@@ -0,0 +1,10 @@
+namespace Presence.API.Response
+{
+    public class GroupResponse
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        public IEnumerable<UserResponse>? Users { get; set; } = null;
+    }
+}

Presence.API/Response/GroupSubjectResponse.cs

@@ -0,0 +1,9 @@
+namespace Presence.API.Response
+{
+    public class GroupSubjectResponse
+    {
+        public string Name { get; set; }
+
+        public IEnumerable<SubjectResponse> Subjects { get; set; }
+    }
+}

Presence.API/Response/PresenceResponse.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Presence.API.Response
+{
+    public class PresenceResponse
+    {
+        public int Id { get; set; }
+        public int StudentId { get; set; }
+        public string StudentName { get; set; }
+        public int SubjectId { get; set; }
+        public string SubjectName { get; set; }
+        public int TrafficId { get; set; }
+        public string TrafficName { get; set; }
+        public int LessonNumber { get; set; }
+        public DateOnly Date { get; set; }
+    }
+}

Presence.API/Response/SubjectResponse.cs

@@ -0,0 +1,8 @@
+namespace Presence.API.Response
+{
+    public class SubjectResponse
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}

Presence.API/Response/UserResponse.cs

@@ -0,0 +1,13 @@
+namespace Presence.API.Response
+{
+    public class UserResponse
+    {
+        public int Id { get; set; }
+
+        public string LastName { get; set; }
+
+        public string FirstName { get; set; }
+
+        public string Patronymic { get; set; }
+    }
+}

Presence.API/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

Presence.API/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

Presence.Desktop/App.axaml

@@ -0,0 +1,15 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Presence.Desktop.App"
+             xmlns:local="using:Presence.Desktop"
+             RequestedThemeVariant="Light">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+  
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

Presence.Desktop/App.axaml.cs

@@ -0,0 +1,36 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Microsoft.Extensions.DependencyInjection;
+using Presence.Desktop.DI;
+using Presence.Desktop.ViewModels;
+using Presence.Desktop.Views;
+
+namespace Presence.Desktop
+{
+    public partial class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            var serviceCollection = new ServiceCollection();
+            serviceCollection.AddComonoServices();
+            var services = serviceCollection.BuildServiceProvider();
+            MainWindowViewModel mainViewModel = services.GetRequiredService<MainWindowViewModel>();
+
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                desktop.MainWindow = new MainWindow
+                {
+                    DataContext = mainViewModel,
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}

Presence.Desktop/DI/ServiceCollectionExtension.cs

@@ -0,0 +1,21 @@
+using data;
+using data.Repository;
+using domain.UseCase;
+using domain.Service;
+using Microsoft.Extensions.DependencyInjection;
+using Presence.Desktop.ViewModels;
+
+namespace Presence.Desktop.DI
+{
+    public static class ServiceCollectionExtension
+    {
+        public static void AddComonoServices(this IServiceCollection collection)
+        {
+            collection
+                .AddDbContext<DatabaseContext>()
+                .AddSingleton<IGroupRepository, SQLGroupRepository>()
+                .AddTransient<IGroupUseCase, GroupService>()
+                .AddTransient<MainWindowViewModel>();
+        }
+    }
+}

Presence.Desktop/Helpers/CsvHelper.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using domain.Request;
+using Presence.Desktop.Models;
+
+namespace Presence.Desktop.Helpers
+{
+    public static class CsvHelper
+    {
+        public static IEnumerable<AddStudentRequest> ReadCsvStudents(string path)
+        {
+            List<AddStudentRequest> students = new List<AddStudentRequest>();
+            var csvLines = File.ReadAllLines(path, Encoding.GetEncoding("utf-8"));
+
+            using (var reader = new StreamReader(path))
+            {
+                string line;
+
+                while ((line = reader.ReadLine()) != null)
+                {
+                    var values = line.Split(';');
+                    if (values.Length != 3)
+                        continue;
+
+                    students.Add(new AddStudentRequest
+                    {
+                        LastName = values[0],
+                        FirstName = values[1],
+                        Patronymic = values[2]
+                    });
+                }
+            }
+
+            return students;
+        }
+    }
+}

Presence.Desktop/Models/GroupPresenter.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Presence.Desktop.Models
+{
+    public class GroupPresenter
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public List<StudentPresenter>? students = null; 
+    }
+}

Presence.Desktop/Models/StudentPresenter.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Presence.Desktop.Models
+{
+    public class StudentPresenter
+    {
+        public int Id { get; set; }
+
+        public string LastName { get; set; }
+
+        public string FirstName { get; set; }
+
+        public string Patronymic { get; set; }
+
+        public GroupPresenter Group { get; set; }
+    }
+}

Presence.Desktop/Presence.Desktop.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.1.0" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.1.0" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.1.0" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.1.0" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.1.0" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.1.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\data\data.csproj" />
+    <ProjectReference Include="..\domain\domain.csproj" />
+  </ItemGroup>
+</Project>

Presence.Desktop/Program.cs

@@ -0,0 +1,24 @@
+using Avalonia;
+using Avalonia.ReactiveUI;
+using System;
+
+namespace Presence.Desktop
+{
+    internal sealed class Program
+    {
+        // Initialization code. Don't use any Avalonia, third-party APIs or any
+        // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+        // yet and stuff might break.
+        [STAThread]
+        public static void Main(string[] args) => BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+
+        // Avalonia configuration, don't remove; also used by visual designer.
+        public static AppBuilder BuildAvaloniaApp()
+            => AppBuilder.Configure<App>()
+                .UsePlatformDetect()
+                .WithInterFont()
+                .LogToTrace()
+                .UseReactiveUI();
+    }
+}

Presence.Desktop/ViewLocator.cs

@@ -0,0 +1,34 @@
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Presence.Desktop.ViewModels;
+using System;
+
+namespace Presence.Desktop
+{
+    public class ViewLocator : IDataTemplate
+    {
+
+        public Control? Build(object? data)
+        {
+            if (data is null)
+                return null;
+
+            var name = data.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+            var type = Type.GetType(name);
+
+            if (type != null)
+            {
+                var control = (Control)Activator.CreateInstance(type)!;
+                control.DataContext = data;
+                return control;
+            }
+
+            return new TextBlock { Text = "Not Found: " + name };
+        }
+
+        public bool Match(object? data)
+        {
+            return data is ViewModelBase;
+        }
+    }
+}

Presence.Desktop/ViewModels/EditWindowViewModel.cs

@@ -0,0 +1,6 @@
+namespace Presence.Desktop.ViewModels;
+
+public class EditWindowViewModel : ViewModelBase
+{
+    
+}

Presence.Desktop/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,259 @@
+using domain.UseCase;
+using Presence.Desktop.Models;
+using Presence.Desktop.Helpers;
+using System;
+using System.Reactive.Linq;
+using System.Reactive;
+using System.Linq;
+using ReactiveUI;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using System.IO;
+using System.Windows.Input;
+using System.Threading.Tasks;
+using Avalonia.Controls.Selection;
+using domain.Request;
+using System.Text;
+
+namespace Presence.Desktop.ViewModels
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+        private readonly IGroupUseCase _groupService;
+        private List<GroupPresenter> groupPresenters = new List<GroupPresenter>();
+        private ObservableCollection<GroupPresenter> _groups;
+        public ObservableCollection<GroupPresenter> Groups
+        {
+            get => _groups;
+            set => this.RaiseAndSetIfChanged(ref _groups, value);
+        }
+
+        private GroupPresenter? _selectedGroupItem;
+        public GroupPresenter? SelectedGroupItem
+        {
+            get => _selectedGroupItem;
+            set => this.RaiseAndSetIfChanged(ref _selectedGroupItem, value);
+        }
+
+        private ObservableCollection<StudentPresenter> _students;
+        public ObservableCollection<StudentPresenter> Students
+        {
+            get => _students;
+            set => this.RaiseAndSetIfChanged(ref _students, value);
+        }
+
+        public Interaction<Unit, string?> ShowOpenFileDialog;
+        private string? _selectedFile;
+        public string? SelectedFile
+        {
+            get => _selectedFile;
+            set => this.RaiseAndSetIfChanged(ref _selectedFile, value);
+        }
+
+        private bool _MultipleSelected = false;
+        public bool MultipleSelected { get => _MultipleSelected; set => this.RaiseAndSetIfChanged(ref _MultipleSelected, value); }
+        public SelectionModel<StudentPresenter> Selection { get; }
+
+        private string _selectedSort = "Релевантность";
+
+        public string SelectedSort
+        {
+            get => _selectedSort;
+            set => this.RaiseAndSetIfChanged(ref _selectedSort, value);
+        }
+
+        public List<string> Sorting { get; set; } =
+        [
+            "Релевантность",
+            "А-Я",
+            "Я-А"
+        ];
+
+        public ICommand OpenFileDialog { get; }
+
+        public ICommand EditCommand { get; }
+        public ICommand DeleteCommand { get; }
+        public ICommand DeleteSelectedCommand { get; }
+        public ICommand DeleteAllCommand { get; }
+
+        public MainWindowViewModel()
+        {
+            _groupService = null;
+            _groups = new();
+            _students = new();
+            OpenFileDialog = ReactiveCommand.CreateFromTask(SelectFile);
+        }
+
+        public MainWindowViewModel(IGroupUseCase gService)
+        {
+            _groupService = gService;
+            ShowOpenFileDialog = new Interaction<Unit, string?>();
+            OpenFileDialog = ReactiveCommand.CreateFromTask(SelectFile);
+
+            _students = new();
+
+            this.WhenAnyValue(vm => vm.SelectedGroupItem,
+                    x => x.SelectedSort)
+                .Subscribe(_ =>
+                {
+                    RefreshGroups();
+                    SetStudents(SelectedSort);
+                });
+
+            Selection = new SelectionModel<StudentPresenter>();
+            Selection.SingleSelect = false;
+            Selection.SelectionChanged += (sender, args) =>
+            {
+                MultipleSelected = Selection.SelectedItems.Count > 1;
+            };
+
+            DeleteCommand = ReactiveCommand.Create(DeleteStudent);
+            DeleteSelectedCommand = ReactiveCommand.Create(DeleteStudent);
+            DeleteAllCommand = ReactiveCommand.Create(DeleteAllStudents);
+
+        }
+
+        private void RefreshGroups()
+        {
+            groupPresenters.Clear();
+            foreach (var item in _groupService.GetGroupsWithStudents())
+            {
+                GroupPresenter groupPresenter = new GroupPresenter
+                {
+                    Id = item.Id,
+                    Name = item.Name,
+                    students = item.Users?.Select(u => new StudentPresenter
+                    {
+                        Id = u.Id,
+                        FirstName = u.FirstName,
+                        LastName = u.LastName,
+                        Patronymic = u.Patronymic,
+                        Group = new GroupPresenter
+                        {
+                            Id = item.Id,
+                            Name = item.Name
+                        }
+                    }).ToList()
+                };
+                groupPresenters.Add(groupPresenter);
+            }
+
+            _groups = new(groupPresenters);
+        }
+
+        private void SetStudents(string selectedSort)
+        {
+            if (SelectedGroupItem == null) return;
+            if (SelectedGroupItem.students == null) return;
+
+            Students.Clear();
+
+            List<StudentPresenter> students = new(_groupService.GetGroupsWithStudents()
+                .Single(g => g.Id == SelectedGroupItem.Id)
+                .Users
+                .Select(u => new StudentPresenter
+                {
+                    Id = u.Id,
+                    FirstName = u.FirstName,
+                    LastName = u.LastName,
+                    Patronymic = u.Patronymic,
+                    Group = new GroupPresenter()
+                    {
+                        Id = SelectedGroupItem.Id,
+                        Name = SelectedGroupItem.Name
+                    }
+                })
+            );
+
+            students = selectedSort switch
+            {
+                "Релевантность" => students.OrderBy(s => s.Id).ToList(),
+                "А-Я" => students.OrderBy(s => s.LastName).ToList(),
+                "Я-А" => students.OrderByDescending(s => s.LastName).ToList(),
+                _ => students
+            };
+
+            foreach (var student in students)
+                Students.Add(student);
+        }
+
+        private async Task SelectFile()
+        {
+            try
+            {
+                SelectedFile = await ShowOpenFileDialog.Handle(Unit.Default);
+            }
+            catch (Exception)
+            {
+                return;
+            }
+
+            if (SelectedGroupItem == null) return;
+
+            try
+            {
+                var studentsToAdd = CsvHelper.ReadCsvStudents(SelectedFile);
+
+                if (studentsToAdd.Any())
+                {
+                    _groupService.AddStudentsToGroup(SelectedGroupItem.Id, studentsToAdd);
+
+                    foreach (var studentRequest in studentsToAdd)
+                    {
+                        var studentPresenter = new StudentPresenter
+                        {
+                            LastName = studentRequest.LastName,
+                            FirstName = studentRequest.FirstName,
+                            Patronymic = studentRequest.Patronymic,
+                            Group = SelectedGroupItem
+                        };
+
+                        SelectedGroupItem.students.Add(studentPresenter);
+                        Students.Add(studentPresenter);
+                    }
+
+                    RefreshGroups();
+                    SetStudents(SelectedSort);
+                }
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex.Message);
+            }
+
+        }
+
+        private void DeleteStudent()
+        {
+            if (Selection.SelectedItems == null || Selection.SelectedItems.Count == 0) return;
+
+            var studentIds = Selection.SelectedItems.Select(s => s.Id).ToList();
+            _groupService.RemoveStudentsFromGroupByIds(SelectedGroupItem.Id, studentIds);
+
+            foreach (var student in Selection.SelectedItems.ToList())
+            {
+                SelectedGroupItem.students.Remove(student);
+                Students.Remove(student);
+            }
+
+            SetStudents(SelectedSort);
+            RefreshGroups();
+        }
+
+        private void DeleteAllStudents()
+        {
+            if (Students.Count == 0 && SelectedGroupItem == null) return;
+
+            _groupService.RemoveStudentsFromGroup(SelectedGroupItem.Id);
+
+            SelectedGroupItem.students.Clear();
+            Students.Clear();
+
+            RefreshGroups();
+            SetStudents(SelectedSort);
+
+        }
+
+    }
+}

Presence.Desktop/ViewModels/ViewModelBase.cs

@@ -0,0 +1,8 @@
+using ReactiveUI;
+
+namespace Presence.Desktop.ViewModels
+{
+    public class ViewModelBase : ReactiveObject
+    {
+    }
+}

Presence.Desktop/Views/EditWindow.axaml

@@ -0,0 +1,17 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:vm="using:Presence.Desktop.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Presence.Desktop.EditWindow"
+        x:DataType="vm:EditWindowViewModel"
+        Title="Edit">
+
+    <Design.DataContext>
+      <vm:EditWindowViewModel/>
+  </Design.DataContext>
+
+
+
+</Window>

Presence.Desktop/Views/EditWindow.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Presence.Desktop;
+
+public partial class EditWindow : Window
+{
+    public EditWindow()
+    {
+        InitializeComponent();
+    }
+}

Presence.Desktop/Views/MainWindow.axaml

@@ -0,0 +1,70 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:Presence.Desktop.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Presence.Desktop.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Presence.Desktop">
+
+    <Design.DataContext>
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <DockPanel>
+        <StackPanel
+            Spacing="10"
+            HorizontalAlignment="Center"
+            DockPanel.Dock="Top"
+            Orientation="Horizontal">
+            <ComboBox ItemsSource="{Binding Groups}" 
+                      SelectedValue="{Binding SelectedGroupItem}"
+                      DisplayMemberBinding="{Binding Name}"
+                      SelectedValueBinding="{Binding}"
+                      />
+			<Button Width="140" HorizontalContentAlignment="Center" Content="Внести студентов" Command="{Binding OpenFileDialog}"/>
+            <ComboBox ItemsSource="{Binding Sorting}" SelectedItem="{Binding SelectedSort}"/>
+            <Button HorizontalAlignment="Right" Content="Удалить всех студентов" Command="{Binding DeleteAllCommand}"/>
+        </StackPanel>
+
+        <Border>
+            <ListBox Name="StudentListBox" SelectionMode="Multiple" Selection="{Binding Selection}" ItemsSource="{Binding Students}">
+                <ListBox.ItemTemplate>
+                    <DataTemplate>
+                        <StackPanel Orientation="Horizontal">
+                            <StackPanel.ContextMenu>
+                                <ContextMenu>
+                                    <MenuItem IsVisible="{Binding !#StudentListBox.((vm:MainWindowViewModel)DataContext).MultipleSelected}" 
+                                              Command="{Binding #StudentListBox.((vm:MainWindowViewModel)DataContext).EditCommand}"
+                                              Header="Изменить"/>
+
+                                    <MenuItem IsVisible="{Binding !#StudentListBox.((vm:MainWindowViewModel)DataContext).MultipleSelected}" 
+                                              Command="{Binding #StudentListBox.((vm:MainWindowViewModel)DataContext).DeleteCommand}"
+                                              Header="Удалить"/>
+
+                                    <MenuItem IsVisible="{Binding #StudentListBox.((vm:MainWindowViewModel)DataContext).MultipleSelected}" 
+                                              Command="{Binding #StudentListBox.((vm:MainWindowViewModel)DataContext).DeleteSelectedCommand}"
+                                              Header="Удалить выделенные"/>
+
+                                </ContextMenu>
+                            </StackPanel.ContextMenu>
+                            <TextBlock>
+								<TextBlock.Text>
+                                    <MultiBinding StringFormat="{}{0} {1} {2}">
+									    <Binding Path="LastName"/>
+									    <Binding Path="FirstName"/>
+									    <Binding Path="Patronymic"/>
+                                    </MultiBinding>
+								</TextBlock.Text>
+                            </TextBlock>
+                        </StackPanel>
+                    </DataTemplate>
+                </ListBox.ItemTemplate>
+            </ListBox>
+        </Border>
+
+    </DockPanel>
+	
+</Window>

Presence.Desktop/Views/MainWindow.axaml.cs

@@ -0,0 +1,51 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform.Storage;
+using Avalonia.ReactiveUI;
+using Presence.Desktop.ViewModels;
+using ReactiveUI;
+using System;
+using System.Linq;
+using System.Reactive;
+using System.Threading.Tasks;
+
+namespace Presence.Desktop.Views
+{
+    public partial class MainWindow : ReactiveWindow<MainWindowViewModel>
+    {
+        public MainWindow()
+        {
+            if (Design.IsDesignMode)
+                ViewModel = new MainWindowViewModel(); 
+
+            InitializeComponent();
+
+            this.WhenActivated(action =>
+            {
+                action(ViewModel.ShowOpenFileDialog.RegisterHandler(ShowOpenFileDialogAsync));
+            });
+        }
+
+        public static FilePickerFileType FileCsv { get; } = new("Comma-Separated Values")
+        {
+            Patterns = ["*.csv"],
+            AppleUniformTypeIdentifiers = ["public.comma-separated-values-text"],
+            MimeTypes = ["application/vnd.ms-excel", "text/csv"]
+        };
+
+        private async Task ShowOpenFileDialogAsync(InteractionContext<Unit, string?> interaction)
+        {
+            var topLevel = GetTopLevel(this);
+            FilePickerOpenOptions fpOptions = new FilePickerOpenOptions
+            {
+                AllowMultiple = false,
+                Title = "students csv",
+                FileTypeFilter = [FileCsv]
+            };
+            var storageFile = await topLevel.StorageProvider.OpenFilePickerAsync(fpOptions);
+
+            interaction.SetOutput(storageFile.First().Path.LocalPath);
+        }
+
+    }
+}

Presence.Desktop/app.manifest

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="Presence.Desktop.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

console_ui/Program.cs

@@ -0,0 +1,36 @@
+using console_ui.UI;
+using data;
+using data.Repository;
+using domain.Service;
+using domain.UseCase;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace console_ui
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            IServiceCollection services = new ServiceCollection();
+            services
+                .AddDbContext<DatabaseContext>()
+                .AddSingleton<IGroupRepository, SQLGroupRepository>()
+                .AddSingleton<IGroupUseCase, GroupService>()
+                .AddSingleton<GroupUI>();
+
+            var serviceProvider = services.BuildServiceProvider();
+            var groupUI = serviceProvider.GetService<GroupUI>();
+            var repo = serviceProvider.GetService<IGroupRepository>();
+
+            printAllGroups(repo!);
+        }
+
+        static void printAllGroups(IGroupRepository groupRepository)
+        {
+            foreach (var item in groupRepository.GetAllGroups())
+            {
+                Console.WriteLine($"{item.Id} \t {item.Name}");
+            }
+        }
+    }
+}

console_ui/UI/GroupUI.cs

@@ -0,0 +1,54 @@
+using domain.Request;
+using domain.Service;
+using domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace console_ui.UI
+{
+    public class GroupUI
+    {
+        private readonly IGroupUseCase _groupService;
+
+        public GroupUI(IGroupUseCase groupService)
+        {
+            _groupService = groupService;
+        }
+
+        public void AddGroup() 
+        {
+            Console.Write("Введите имя группы: ");
+            _groupService.AddGroup(new AddGroupRequest { Name = Console.ReadLine() });
+        }
+
+        public void AddGroupWithStudents()
+        {
+            Console.Write("Введите имя группы: ");
+            AddGroupRequest addGroupRequest = new AddGroupRequest { Name = Console.ReadLine() };
+            List<AddStudentRequest> addStudentRequests = new List<AddStudentRequest>()
+            {
+                new AddStudentRequest {FirstName = "Имя", LastName = "Фамилия", Patronymic = "Отчество"},
+                new AddStudentRequest {FirstName = "Imya", LastName = "Familiya", Patronymic = "Otchestvo"},
+                new AddStudentRequest {FirstName = "FirstName", LastName = "LastName", Patronymic = "Patronymic"},
+                new AddStudentRequest {FirstName = "1", LastName = "2", Patronymic = "3"},
+            };
+            AddGroupWithStudentRequest addGroupWithStudentRequest = new() 
+            { 
+                AddGroupRequest = addGroupRequest,
+                AddStudentRequests = addStudentRequests 
+            };
+
+            _groupService.AddGroupWithStudents(addGroupWithStudentRequest);
+        }
+
+        public void RemoveGroup()
+        {
+            Console.Write("Введите индетефикатор группы: ");
+            RemoveGroupRequest removeGroupRequest = new RemoveGroupRequest { GroupId = int.Parse(Console.ReadLine()) };
+            _groupService.RemoveGroup(removeGroupRequest);
+        }
+    }
+}

console_ui/console_ui.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
+  </ItemGroup>
+
+	<ItemGroup>
+		<ProjectReference Include="../data/data.csproj" />
+		<ProjectReference Include="..\domain\domain.csproj" />
+	</ItemGroup>
+	
+</Project>

data/DAO/Diary.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Diary
+    {
+        [Key]
+        public int Id { get; set; }
+
+        public string? DiaryText { get; set; }
+
+        public int TrafficId { get; set; }
+
+        public int StudentGroupSubjectId { get; set; }
+
+        public int StudentId { get; set; }
+
+        public virtual Traffic Traffic { get; set; }
+
+        public virtual StudentGroupSubject StudentGroupSubject { get; set; }
+        public virtual Student Student { get; set; }
+
+        public int NumberSubject { get; set; }
+
+        public DateOnly Date { get; set; }
+    }
+}

data/DAO/Group.cs

@@ -0,0 +1,20 @@
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Group
+    {
+        [Key]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        public virtual ICollection<Student> Students { get; set; } = new List<Student>();
+        public virtual ICollection<StudentGroupSubject> StudentGroupsSubjects { get; set; } = new List<StudentGroupSubject>();
+    }
+}

data/DAO/Student.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Student
+    {
+        [Key]
+        public int Id { get; set; }
+        
+        public string LastName { get; set; }
+        
+        public string FirstName { get; set; }
+        
+        public string Patronymic { get; set; }
+
+        public int GroupId { get; set; }
+
+        public virtual ICollection<Diary> Diaries { get; set; } = new List<Diary>();
+
+        public virtual Group Group { get; set; }
+    }
+}

data/DAO/StudentGroupSubject.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class StudentGroupSubject
+    {
+        [Key]
+        public int Id { get; set; }
+        public virtual Group Group { get; set; }
+        public int SemesterStart { get; set; }
+        public int SemesterEnd { get; set; }
+        public virtual Subject Subject { get; set; }
+
+        public virtual ICollection<Diary> Diaries { get; set; } = new List<Diary>();
+    }
+}

data/DAO/Subject.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    // Предметы
+    public class Subject
+    {
+        [Key]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        public virtual ICollection<StudentGroupSubject> StudentGroupsSubjects { get; set; } = new List<StudentGroupSubject>();
+    }
+}

data/DAO/Traffic.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Traffic
+    {
+        [Key]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        public virtual ICollection<Diary> Diaries { get; set; } = new List<Diary>();
+    }
+}

data/DatabaseContext.cs

@@ -0,0 +1,47 @@
+using data.DAO;
+using Microsoft.EntityFrameworkCore;
+
+namespace data;
+
+public class DatabaseContext : DbContext
+{
+    public DatabaseContext() { }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        => optionsBuilder.UseNpgsql("Host=45.67.56.214;Port=5454;Username=user13;Password=keNBA0yK");
+
+    public DbSet<Student> Students { get; set; }
+
+    public DbSet<Group> Groups { get; set; }
+
+    public DbSet<Diary> Diaries { get; set; }
+
+    public DbSet<Subject> Subjects { get; set; }
+
+    public DbSet<Traffic> Traffics { get; set; }
+
+    public DbSet<StudentGroupSubject> StudentGroupsSubjects { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Student>().Property(it => it.Id).ValueGeneratedOnAdd();
+        modelBuilder.Entity<Group>().Property(it => it.Id).ValueGeneratedOnAdd();
+        modelBuilder.Entity<Traffic>().Property(it => it.Id).ValueGeneratedOnAdd();
+        modelBuilder.Entity<StudentGroupSubject>().Property(it => it.Id).ValueGeneratedOnAdd();
+        modelBuilder.Entity<Diary>().Property(it => it.Id).ValueGeneratedOnAdd();
+        modelBuilder.Entity<Subject>().Property(it => it.Id).ValueGeneratedOnAdd();
+
+        modelBuilder.Entity<Student>()
+            .HasOne(it => it.Group);
+        modelBuilder.Entity<Diary>()
+            .HasOne(it => it.StudentGroupSubject);
+        modelBuilder.Entity<Diary>()
+            .HasOne(it => it.Traffic);
+        modelBuilder.Entity<Diary>()
+            .HasOne(it => it.Student);
+        modelBuilder.Entity<StudentGroupSubject>()
+            .HasOne(it => it.Group);
+        modelBuilder.Entity<StudentGroupSubject>()
+            .HasOne(it => it.Subject);
+    }
+}

data/Migrations/20241120062915_InitialCreate.Designer.cs

@@ -0,0 +1,222 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using data;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20241120062915_InitialCreate")]
+    partial class InitialCreate
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.10")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateOnly>("Date")
+                        .HasColumnType("date");
+
+                    b.Property<string>("DiaryText")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("NumberSubject")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentGroupSubjectId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("TrafficId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StudentGroupSubjectId");
+
+                    b.HasIndex("TrafficId");
+
+                    b.ToTable("Diaries");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Patronymic")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterEnd")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterStart")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("StudentGroupsSubjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Subjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Traffic", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Traffics");
+                });
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.HasOne("data.DAO.StudentGroupSubject", "StudentGroupSubject")
+                        .WithMany()
+                        .HasForeignKey("StudentGroupSubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Traffic", "Traffic")
+                        .WithMany()
+                        .HasForeignKey("TrafficId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("StudentGroupSubject");
+
+                    b.Navigation("Traffic");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany()
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany()
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany()
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Subject");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/Migrations/20241120062915_InitialCreate.cs

@@ -0,0 +1,181 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialCreate : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Groups",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Name = table.Column<string>(type: "text", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Groups", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Subjects",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Name = table.Column<string>(type: "text", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Subjects", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Traffics",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Name = table.Column<string>(type: "text", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Traffics", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Students",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    LastName = table.Column<string>(type: "text", nullable: false),
+                    FirstName = table.Column<string>(type: "text", nullable: false),
+                    Patronymic = table.Column<string>(type: "text", nullable: false),
+                    GroupId = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Students", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Students_Groups_GroupId",
+                        column: x => x.GroupId,
+                        principalTable: "Groups",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "StudentGroupsSubjects",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    GroupId = table.Column<int>(type: "integer", nullable: false),
+                    SemesterStart = table.Column<int>(type: "integer", nullable: false),
+                    SemesterEnd = table.Column<int>(type: "integer", nullable: false),
+                    SubjectId = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_StudentGroupsSubjects", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_StudentGroupsSubjects_Groups_GroupId",
+                        column: x => x.GroupId,
+                        principalTable: "Groups",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_StudentGroupsSubjects_Subjects_SubjectId",
+                        column: x => x.SubjectId,
+                        principalTable: "Subjects",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Diaries",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    DiaryText = table.Column<string>(type: "text", nullable: false),
+                    TrafficId = table.Column<int>(type: "integer", nullable: false),
+                    StudentGroupSubjectId = table.Column<int>(type: "integer", nullable: false),
+                    NumberSubject = table.Column<int>(type: "integer", nullable: false),
+                    Date = table.Column<DateOnly>(type: "date", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Diaries", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Diaries_StudentGroupsSubjects_StudentGroupSubjectId",
+                        column: x => x.StudentGroupSubjectId,
+                        principalTable: "StudentGroupsSubjects",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Diaries_Traffics_TrafficId",
+                        column: x => x.TrafficId,
+                        principalTable: "Traffics",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Diaries_StudentGroupSubjectId",
+                table: "Diaries",
+                column: "StudentGroupSubjectId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Diaries_TrafficId",
+                table: "Diaries",
+                column: "TrafficId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StudentGroupsSubjects_GroupId",
+                table: "StudentGroupsSubjects",
+                column: "GroupId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StudentGroupsSubjects_SubjectId",
+                table: "StudentGroupsSubjects",
+                column: "SubjectId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Students_GroupId",
+                table: "Students",
+                column: "GroupId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Diaries");
+
+            migrationBuilder.DropTable(
+                name: "Students");
+
+            migrationBuilder.DropTable(
+                name: "StudentGroupsSubjects");
+
+            migrationBuilder.DropTable(
+                name: "Traffics");
+
+            migrationBuilder.DropTable(
+                name: "Groups");
+
+            migrationBuilder.DropTable(
+                name: "Subjects");
+        }
+    }
+}

data/Migrations/20241122130535_Fix.Designer.cs

@@ -0,0 +1,240 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using data;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20241122130535_Fix")]
+    partial class Fix
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.10")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateOnly>("Date")
+                        .HasColumnType("date");
+
+                    b.Property<string>("DiaryText")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("NumberSubject")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentGroupSubjectId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("TrafficId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StudentGroupSubjectId");
+
+                    b.HasIndex("TrafficId");
+
+                    b.ToTable("Diaries");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Patronymic")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterEnd")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterStart")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("StudentId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("StudentGroupsSubjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Subjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Traffic", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Traffics");
+                });
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.HasOne("data.DAO.StudentGroupSubject", "StudentGroupSubject")
+                        .WithMany()
+                        .HasForeignKey("StudentGroupSubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Traffic", "Traffic")
+                        .WithMany()
+                        .HasForeignKey("TrafficId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("StudentGroupSubject");
+
+                    b.Navigation("Traffic");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany("Students")
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany()
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Student", "Student")
+                        .WithMany()
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany()
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Student");
+
+                    b.Navigation("Subject");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Navigation("Students");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/Migrations/20241122130535_Fix.cs

@@ -0,0 +1,50 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    /// <inheritdoc />
+    public partial class Fix : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "StudentId",
+                table: "StudentGroupsSubjects",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StudentGroupsSubjects_StudentId",
+                table: "StudentGroupsSubjects",
+                column: "StudentId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_StudentGroupsSubjects_Students_StudentId",
+                table: "StudentGroupsSubjects",
+                column: "StudentId",
+                principalTable: "Students",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_StudentGroupsSubjects_Students_StudentId",
+                table: "StudentGroupsSubjects");
+
+            migrationBuilder.DropIndex(
+                name: "IX_StudentGroupsSubjects_StudentId",
+                table: "StudentGroupsSubjects");
+
+            migrationBuilder.DropColumn(
+                name: "StudentId",
+                table: "StudentGroupsSubjects");
+        }
+    }
+}

data/Migrations/20241122130744_FixIssueAgain.Designer.cs

@@ -0,0 +1,240 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using data;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20241122130744_FixIssueAgain")]
+    partial class FixIssueAgain
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.10")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateOnly>("Date")
+                        .HasColumnType("date");
+
+                    b.Property<string>("DiaryText")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("NumberSubject")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentGroupSubjectId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("TrafficId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StudentGroupSubjectId");
+
+                    b.HasIndex("StudentId");
+
+                    b.HasIndex("TrafficId");
+
+                    b.ToTable("Diaries");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Patronymic")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterEnd")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterStart")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("StudentGroupsSubjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Subjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Traffic", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Traffics");
+                });
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.HasOne("data.DAO.StudentGroupSubject", "StudentGroupSubject")
+                        .WithMany()
+                        .HasForeignKey("StudentGroupSubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Student", "Student")
+                        .WithMany()
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Traffic", "Traffic")
+                        .WithMany()
+                        .HasForeignKey("TrafficId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Student");
+
+                    b.Navigation("StudentGroupSubject");
+
+                    b.Navigation("Traffic");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany("Students")
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany()
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany()
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Subject");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Navigation("Students");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/Migrations/20241122130744_FixIssueAgain.cs

@@ -0,0 +1,82 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    /// <inheritdoc />
+    public partial class FixIssueAgain : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_StudentGroupsSubjects_Students_StudentId",
+                table: "StudentGroupsSubjects");
+
+            migrationBuilder.DropIndex(
+                name: "IX_StudentGroupsSubjects_StudentId",
+                table: "StudentGroupsSubjects");
+
+            migrationBuilder.DropColumn(
+                name: "StudentId",
+                table: "StudentGroupsSubjects");
+
+            migrationBuilder.AddColumn<int>(
+                name: "StudentId",
+                table: "Diaries",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Diaries_StudentId",
+                table: "Diaries",
+                column: "StudentId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Diaries_Students_StudentId",
+                table: "Diaries",
+                column: "StudentId",
+                principalTable: "Students",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Diaries_Students_StudentId",
+                table: "Diaries");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Diaries_StudentId",
+                table: "Diaries");
+
+            migrationBuilder.DropColumn(
+                name: "StudentId",
+                table: "Diaries");
+
+            migrationBuilder.AddColumn<int>(
+                name: "StudentId",
+                table: "StudentGroupsSubjects",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StudentGroupsSubjects_StudentId",
+                table: "StudentGroupsSubjects",
+                column: "StudentId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_StudentGroupsSubjects_Students_StudentId",
+                table: "StudentGroupsSubjects",
+                column: "StudentId",
+                principalTable: "Students",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+    }
+}

data/Migrations/DatabaseContextModelSnapshot.cs

@@ -0,0 +1,237 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using data;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    partial class DatabaseContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.10")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateOnly>("Date")
+                        .HasColumnType("date");
+
+                    b.Property<string>("DiaryText")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("NumberSubject")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentGroupSubjectId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("TrafficId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StudentGroupSubjectId");
+
+                    b.HasIndex("StudentId");
+
+                    b.HasIndex("TrafficId");
+
+                    b.ToTable("Diaries");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Patronymic")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterEnd")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterStart")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("StudentGroupsSubjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Subjects");
+                });
+
+            modelBuilder.Entity("data.DAO.Traffic", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Traffics");
+                });
+
+            modelBuilder.Entity("data.DAO.Diary", b =>
+                {
+                    b.HasOne("data.DAO.StudentGroupSubject", "StudentGroupSubject")
+                        .WithMany()
+                        .HasForeignKey("StudentGroupSubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Student", "Student")
+                        .WithMany()
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Traffic", "Traffic")
+                        .WithMany()
+                        .HasForeignKey("TrafficId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Student");
+
+                    b.Navigation("StudentGroupSubject");
+
+                    b.Navigation("Traffic");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany("Students")
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+                });
+
+            modelBuilder.Entity("data.DAO.StudentGroupSubject", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany()
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany()
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Subject");
+                });
+
+            modelBuilder.Entity("data.DAO.Group", b =>
+                {
+                    b.Navigation("Students");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/Repository/IAdminRepository.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace data.Repository
+{
+    public interface IAdminRepository
+    {
+        void AddStudentsToGroup(int groupId, IEnumerable<int> studentIds);
+        void AddSubjectsToGroup(int groupId, IEnumerable<int> subjectIds);
+    }
+}

data/Repository/IGroupRepository.cs

@@ -0,0 +1,67 @@
+using data.DAO;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.Repository
+{
+    public interface IGroupRepository
+    {
+        /// <summary>
+        /// Получение списка групп
+        /// </summary>
+        public IEnumerable<Group> GetAllGroups();
+        
+        /// <summary>
+        /// Создание группы
+        /// </summary>
+        /// <param name="group">группа</param>
+        public bool CreateGroup(Group group);
+
+        /// <summary>
+        /// Создание группы вместо со студентами
+        /// </summary>
+        /// <param name="group">группа</param>
+        /// <param name="students">список студентов</param>
+        public bool AddGroupWithStudents(Group group, IEnumerable<Student> students);
+
+        /// <summary>
+        /// TODO
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="students"></param>
+        /// <returns></returns>
+        public bool AddStudentsToGroup(int id, IEnumerable<Student> students);
+
+        /// <summary>
+        /// Удаление группы по индетефикатору
+        /// </summary>
+        /// <param name="id">индетефикатор</param>
+        public bool DeleteGroup(int id);
+
+        /// <summary>
+        /// Обновление наименование группы
+        /// </summary>
+        /// <param name="id">индетефикатор</param>
+        /// <param name="name">наименованвие</param>
+        public bool UpdateGroup(int id, string name);
+        
+        /// <summary>
+        /// Удаление всех студентов из группы
+        /// </summary>
+        /// <param name="id">индетефикатор</param>
+        /// <returns></returns>
+        public bool RemoveStudentsFromGroup(int id);
+
+        /// <summary>
+        /// Удаление студентов из группы по их индетефикатору
+        /// </summary>
+        /// <param name="id">индетефикатор группы</param>
+        /// <param name="studentIds">список индетефикаторов студентов</param>
+        /// <returns></returns>
+        public bool RemoveStudentsFromGroupByIds(int id, IEnumerable<int> studentIds);
+
+    }
+}

data/Repository/IPresenceRepository.cs

@@ -0,0 +1,23 @@
+using data.DAO;
+using System;
+using System.Collections.Generic;
+
+namespace data.Repository
+{
+    public interface IPresenceRepository
+    {
+        IEnumerable<Diary> GetPresence(
+            int groupId,
+            int? subjectId = null,
+            DateOnly? date = null,
+            int? studentId = null);
+
+        public void DeleteAllPresence();
+
+        public void DeleteGroupPresence(int groupId);
+
+        public void AddPresenceRecords(List<Diary> items);
+
+        public void UpdatePresenceRecords(List<Diary> items);
+    }
+}

data/Repository/SQLAdminRepository.cs

@@ -0,0 +1,58 @@
+using data.Repository;
+using data.DAO;
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace data.Repository
+{
+    public class SQLAdminRepository : IAdminRepository
+    {
+        private readonly DatabaseContext _context;
+
+        public SQLAdminRepository(DatabaseContext context)
+        {
+            _context = context;
+        }
+
+        public void AddStudentsToGroup(int groupId, IEnumerable<int> studentIds)
+        {
+            var group = _context.Groups.Include(g => g.Students).FirstOrDefault(g => g.Id == groupId);
+            if (group == null) return;
+
+            var studentsToAdd = _context.Students
+                .Where(u => studentIds.Contains(u.Id))
+                .ToList();
+
+            foreach (var student in studentsToAdd)
+            {
+                if (!group.Students.Any(u => u.Id == student.Id))
+                {
+                    group.Students.Add(student);
+                }
+            }
+
+            _context.SaveChanges();
+        }
+
+        public void AddSubjectsToGroup(int groupId, IEnumerable<int> subjectIds)
+        {
+            var group = _context.Groups.Include(g => g.StudentGroupsSubjects).ThenInclude(s => s.Subject).FirstOrDefault(g => g.Id == groupId);
+            if (group == null) return;
+
+            var subjectsToAdd = _context.Subjects
+                .Where(s => subjectIds.Contains(s.Id))
+                .ToList();
+
+            foreach (var subject in subjectsToAdd)
+            {
+                if (!group.StudentGroupsSubjects.Any(s => s.Subject.Id == subject.Id))
+                {
+                    group.StudentGroupsSubjects.Add(new StudentGroupSubject { Subject = subject });
+                }
+            }
+
+            _context.SaveChanges();
+        }
+    }
+}

data/Repository/SQLGroupRepository.cs

@@ -0,0 +1,119 @@
+using data.DAO;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace data.Repository
+{
+    public class SQLGroupRepository : IGroupRepository
+    {
+        private readonly DatabaseContext _dbContext;
+        public SQLGroupRepository(DatabaseContext dbContext)
+        {
+            _dbContext = dbContext;
+        }
+
+        public bool AddGroupWithStudents(Group group, IEnumerable<Student> students)
+        {
+            using var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                _dbContext.Groups.Add(group);
+                _dbContext.SaveChanges();
+                foreach (var item in students)
+                {
+                    item.Group = group;
+                    _dbContext.Students.Add(item);
+                }
+                _dbContext.SaveChanges();
+                transaction.Commit();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine("Во время добавления группы со студентами произошла ошибка: ", ex.Message);
+                transaction.Rollback();
+            } 
+            return false;
+        }
+
+        public bool AddStudentsToGroup(int id, IEnumerable<Student> students)
+        {
+            using var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                Group group = _dbContext.Groups.Find(id);
+                foreach (var student in students)
+                {
+                    student.Group = group;
+                    student.GroupId = id;
+                    _dbContext.Students.Add(student);
+                }
+
+                _dbContext.SaveChanges();
+                transaction.Commit();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine("Во время добавления студентов в группу произошла ошибка: ", ex.Message);
+                transaction.Rollback();
+            }
+
+            return false;
+        }
+
+        public bool CreateGroup(Group group)
+        {
+            _dbContext.Groups.Add(group);
+            return _dbContext.SaveChanges() > 0;
+        }
+
+        public bool DeleteGroup(int id)
+        {
+            Group group = _dbContext.Groups.Single(g => g.Id == id);
+            _dbContext.Groups.Remove(group);
+            return _dbContext.SaveChanges() > 0;
+        }
+
+        public IEnumerable<Group> GetAllGroups()
+            => _dbContext.Groups
+            .Include(g => g.Students)
+            .Include(g => g.StudentGroupsSubjects)
+                .ThenInclude(sgs => sgs.Subject)
+            .ToList();
+
+        public bool UpdateGroup(int id, string name)
+        {
+            Group group = _dbContext.Groups.Single(g => g.Id == id);
+            group.Name = name;
+            return _dbContext.SaveChanges() > 0;
+        }
+
+        public bool RemoveStudentsFromGroup(int id)
+        {
+            var students = _dbContext.Students.Where(s => s.GroupId == id).ToList();
+            _dbContext.Students.RemoveRange(students);
+            return _dbContext.SaveChanges() > 0;
+        }
+
+        public bool RemoveStudentsFromGroupByIds(int id, IEnumerable<int> studentIds)
+        {
+            var studentsToRemove = _dbContext.Students
+                .Where(s => s.GroupId == id && studentIds.Contains(s.Id))
+                .ToList();
+
+            if (studentsToRemove.Any())
+            {
+                _dbContext.Students.RemoveRange(studentsToRemove);
+                return _dbContext.SaveChanges() > 0;
+            }
+
+            return false;
+        }
+    }
+}

data/Repository/SQLPresenceRepository.cs

@@ -0,0 +1,83 @@
+using data.DAO;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;   
+using System.Linq;
+
+namespace data.Repository
+{
+    public class SQLPresenceRepository : IPresenceRepository
+    {
+        private readonly DatabaseContext _context;
+
+        public SQLPresenceRepository(DatabaseContext context)
+        {
+            _context = context;
+        }
+
+        public IEnumerable<Diary> GetPresence(
+            int groupId,
+            int? subjectId = null,
+            DateOnly? date = null,
+            int? studentId = null)
+        {
+            var query = _context.Diaries
+                .Include(p => p.Student)
+                .Include(p => p.StudentGroupSubject)
+                    .ThenInclude(p => p.Subject)
+                .Include(p => p.Traffic)
+                .Where(p => p.Student.GroupId == groupId);
+
+            if (subjectId.HasValue)
+                query = query.Where(p => p.StudentGroupSubject.Subject.Id == subjectId.Value);
+
+            if (date.HasValue)
+                query = query.Where(p => p.Date == date.Value);
+
+            if (studentId.HasValue)
+                query = query.Where(p => p.Student.Id == studentId.Value);
+
+            return query.ToList();
+        }
+
+        public void DeleteAllPresence()
+        {
+            _context.Diaries.RemoveRange(_context.Diaries);
+            _context.SaveChanges();
+        }
+
+        public void DeleteGroupPresence(int groupId)
+        {
+            var presencesToDelete = _context.Diaries
+                .Include(p => p.Student)
+                .Where(p => p.Student.GroupId == groupId);
+
+            _context.Diaries.RemoveRange(presencesToDelete);
+            _context.SaveChanges();
+        }
+
+        public void AddPresenceRecords(List<Diary> items)
+        {
+            _context.Diaries.AddRange(items);
+            _context.SaveChanges();
+        }
+
+        public void UpdatePresenceRecords(List<Diary> items)
+        {
+            foreach (var item in items)
+            {
+                var existingRecord = _context.Diaries
+                    .FirstOrDefault(p => 
+                        p.Date == item.Date && 
+                        p.NumberSubject == item.NumberSubject && 
+                        p.StudentId == item.StudentId);
+
+                if (existingRecord != null)
+                {
+                    existingRecord.TrafficId = item.TrafficId;
+                }
+            }
+            _context.SaveChanges();
+        }
+    }
+}

data/data.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.10">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.10" />
+  </ItemGroup>
+
+</Project>

domain/Class1.cs

@@ -0,0 +1,7 @@
+namespace domain
+{
+    public class Class1
+    {
+
+    }
+}

domain/Entity/GroupEntity.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Entity
+{
+    public class GroupEntity
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public IEnumerable<UserEntity> Users { get; set; }
+    }
+}

domain/Entity/GroupSubjectEntity.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Entity
+{
+    public class GroupSubjectEntity
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public IEnumerable<SubjectEntity> Subjects { get; set; }
+    }
+}

domain/Entity/PresenceEntity.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace domain.Entity
+{
+    public class PresenceEntity
+    {
+        public int Id { get; set; }
+        public int StudentId { get; set; }
+        public UserEntity Student { get; set; }
+        public int SubjectId { get; set; }
+        public SubjectEntity Subject { get; set; }
+        public int TrafficId { get; set; }
+        public TrafficEntity Traffic { get; set; }
+        public int LessonNumber { get; set; }
+        public DateOnly Date { get; set; }
+    }
+}

domain/Entity/SubjectEntity.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Entity
+{
+    public class SubjectEntity
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}

domain/Entity/TrafficEntity.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Entity
+{
+    public class TrafficEntity
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}

domain/Entity/UserEntity.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Entity
+{
+    public class UserEntity
+    {
+        public int Id { get; set; }
+
+        public string LastName { get; set; }
+
+        public string FirstName { get; set; }
+
+        public string Patronymic { get; set; }
+        public GroupEntity Group { get; set; }
+    }
+}

domain/Request/AddGroupRequest.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Request
+{
+    public class AddGroupRequest
+    {
+        public string Name { get; set; }
+        public List<AddStudentRequest> Students { get; set; } = new List<AddStudentRequest>();
+    }
+}

domain/Request/AddGroupWithStudentRequest.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Request
+{
+    public class AddGroupWithStudentRequest
+    {
+        public AddGroupRequest AddGroupRequest { get; set; }
+        public IEnumerable<AddStudentRequest> AddStudentRequests { get; set; }
+    }
+}

domain/Request/AddPresenceRequest.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+
+namespace domain.Request
+{
+    public class AddPresenceRequest
+    {
+        public List<PresenceItem> Items { get; set; } = new List<PresenceItem>();
+    }
+
+    public class PresenceItem
+    {
+        public DateOnly Date { get; set; }
+        public int StudentGroupSubjectId { get; set; }
+        public int LessonNumber { get; set; }
+        public int StudentId { get; set; }
+        public int TrafficId { get; set; }
+    }
+}

domain/Request/AddStudentRequest.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Request
+{
+    public class AddStudentRequest
+    {
+        public string LastName { get; set; }
+
+        public string FirstName { get; set; }
+
+        public string Patronymic { get; set; }
+    }
+}

domain/Request/AddStudentsToGroupRequest.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace domain.Request
+{
+    public class AddStudentsToGroupRequest
+    {
+        public List<int> Students { get; set; } = new List<int>();
+    }
+}

domain/Request/AddSubjectsToGroupRequest.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace domain.Request
+{
+    public class AddSubjectsToGroupRequest
+    {
+        public List<int> Subjects { get; set; } = new List<int>();
+    }
+}

domain/Request/EditGroupRequest.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Request
+{
+    public class EditGroupRequest
+    {
+        public int GroupId { get; set; }
+        public string GroupName { get; set; }
+    }
+}

domain/Request/RemoveGroupRequest.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Request
+{
+    public class RemoveGroupRequest
+    {
+        public int GroupId { get; set; }
+    }
+}

domain/Request/UpdatePresenceRequest.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+
+namespace domain.Request
+{
+    public class UpdatePresenceRequest
+    {
+        public List<UpdatePresenceItem> Items { get; set; } = new List<UpdatePresenceItem>();
+    }
+
+    public class UpdatePresenceItem
+    {
+        public DateOnly Date { get; set; }
+        public int LessonNumber { get; set; }
+        public int StudentId { get; set; }
+        public int TrafficId { get; set; }
+    }
+}

domain/Service/AdminService.cs

@@ -0,0 +1,26 @@
+using data.Repository;
+using domain.Request;
+using domain.UseCase;
+
+namespace domain.Service
+{
+    public class AdminService : IAdminUseCase
+    {
+        private readonly IAdminRepository _adminRepository;
+
+        public AdminService(IAdminRepository adminRepository)
+        {
+            _adminRepository = adminRepository;
+        }
+
+        public void AddStudentsToGroup(int groupId, AddStudentsToGroupRequest request)
+        {
+            _adminRepository.AddStudentsToGroup(groupId, request.Students);
+        }
+
+        public void AddSubjectsToGroup(int groupId, AddSubjectsToGroupRequest request)
+        {
+            _adminRepository.AddSubjectsToGroup(groupId, request.Subjects);
+        }
+    }
+}

domain/Service/GroupService.cs

@@ -0,0 +1,107 @@
+using data.DAO;
+using data.Repository;
+using domain.Entity;
+using domain.Request;
+using domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.Service
+{
+    public class GroupService : IGroupUseCase
+    {
+        private readonly IGroupRepository _groupRepository;
+        public GroupService(IGroupRepository groupRepository)
+        {
+            _groupRepository = groupRepository;
+        }
+
+        public bool AddGroup(AddGroupRequest addGroupRequest)
+            => _groupRepository.CreateGroup(new Group { Name = addGroupRequest.Name });
+        
+
+        public void AddGroupWithStudents(AddGroupWithStudentRequest addGroupWithStudentRequest)
+        {
+            Group group = new Group { Name = addGroupWithStudentRequest.AddGroupRequest.Name };
+            List<Student> students = addGroupWithStudentRequest
+                .AddStudentRequests
+                .Select(it => new Student { FirstName = it.FirstName, LastName = it.LastName, Patronymic = it.Patronymic})
+                .ToList();
+
+            _groupRepository.AddGroupWithStudents(group, students);
+        }
+
+        public void AddStudentsToGroup(int id, IEnumerable<AddStudentRequest> students)
+        {
+            List<Student> studentList = students
+                .Select(it => new Student { FirstName = it.FirstName, LastName = it.LastName, Patronymic = it.Patronymic })
+                .ToList();
+
+            _groupRepository.AddStudentsToGroup(id, studentList);
+        }
+
+        public void EditGroup(EditGroupRequest editGroupRequest)
+            => _groupRepository.UpdateGroup(editGroupRequest.GroupId, editGroupRequest.GroupName);
+
+        public IEnumerable<GroupEntity> GetGroupsWithStudents()
+        {
+            return _groupRepository.GetAllGroups().Select(
+                group => new GroupEntity
+                {
+                    Id = group.Id,
+                    Name = group.Name,
+                    Users = group.Students.Select(
+                        user => new UserEntity
+                        {
+                            Id = user.Id,
+                            LastName = user.LastName,
+                            FirstName = user.FirstName,
+                            Patronymic = user.Patronymic,
+                            Group = new GroupEntity
+                            {
+                                Id = group.Id,
+                                Name = group.Name
+                            }
+                        })
+                });
+            }
+
+        public bool RemoveGroup(RemoveGroupRequest removeGroupRequest)
+            => _groupRepository.DeleteGroup(removeGroupRequest.GroupId);
+
+        public GroupSubjectEntity GetGroupSubject(int id)
+        {
+            return _groupRepository.GetAllGroups().Select(
+                group => new GroupSubjectEntity
+                {
+                    Id = group.Id,
+                    Name = group.Name,
+                    Subjects = group.StudentGroupsSubjects.Select(
+                        subject => new SubjectEntity
+                        {
+                            Id = subject.Subject.Id,
+                            Name = subject.Subject.Name,
+                        })
+                }).Single(g => g.Id == id);
+        }
+
+        public void RemoveStudentsFromGroup(int groupId)
+        {
+            _groupRepository.RemoveStudentsFromGroup(groupId);
+        }
+
+        public void RemoveStudentsFromGroupByIds(int groupId, IEnumerable<int> studentIds)
+        {
+            var group = _groupRepository.GetAllGroups().FirstOrDefault(g => g.Id == groupId);
+            if (group == null)
+            {
+                throw new KeyNotFoundException($"Группа с ID {groupId} не найдена.");
+            }
+
+            _groupRepository.RemoveStudentsFromGroupByIds(groupId, studentIds);
+        }
+    }
+}

domain/Service/PresenceService.cs

@@ -0,0 +1,109 @@
+using data.DAO;
+using data.Repository;
+using domain.Entity;
+using domain.Request;
+using domain.UseCase;
+using System;
+using System.Collections.Generic;
+
+namespace domain.Service
+{
+    public class PresenceService : IPresenceUseCase
+    {
+        private readonly IPresenceRepository _presenceRepository;
+
+        public PresenceService(IPresenceRepository presenceRepository)
+        {
+            _presenceRepository = presenceRepository;
+        }
+
+        public IEnumerable<PresenceEntity> GetPresence(
+            int groupId,
+            int? subjectId = null,
+            DateOnly? date = null,
+            int? studentId = null)
+        {
+            return _presenceRepository.GetPresence(groupId, subjectId, date, studentId).Select(p => new PresenceEntity
+            {
+                Id = p.Id,
+                StudentId = p.Student.Id,
+                Student = new UserEntity
+                {
+                    Id = p.Student.Id,
+                    FirstName = p.Student.FirstName,
+                    LastName = p.Student.LastName,
+                    Patronymic = p.Student.Patronymic,
+                    Group = new GroupEntity()
+                },
+                SubjectId = p.StudentGroupSubject.Subject.Id,
+                Subject = new SubjectEntity
+                {
+                    Id = p.StudentGroupSubject.Subject.Id,
+                    Name = p.StudentGroupSubject.Subject.Name
+                },
+                TrafficId = p.TrafficId,
+                Traffic = new TrafficEntity
+                {
+                    Id = p.TrafficId,
+                    Name = p.Traffic.Name
+                },
+                LessonNumber = p.NumberSubject,
+                Date = p.Date
+            });
+        }
+
+        public void DeleteAllPresence()
+        {
+            _presenceRepository.DeleteAllPresence();
+        }
+
+        public void DeleteGroupPresence(int groupId)
+        {
+            _presenceRepository.DeleteGroupPresence(groupId);
+        }
+
+        public void AddPresenceRecords(AddPresenceRequest request)
+        {
+            if (request?.Items == null || request.Items.Count == 0)
+                throw new ArgumentException("No records");
+
+            List<Diary> diaries = new List<Diary>();
+
+            foreach (var item in request.Items)
+            {
+                diaries.Add(new Diary
+                {
+                    Date = item.Date,
+                    DiaryText = "",
+                    NumberSubject = item.LessonNumber,
+                    StudentId = item.StudentId,
+                    TrafficId = item.TrafficId,
+                    StudentGroupSubjectId = item.StudentGroupSubjectId
+                });
+            }
+
+            _presenceRepository.AddPresenceRecords(diaries);
+        }
+
+        public void UpdatePresenceRecords(UpdatePresenceRequest request)
+        {
+            if (request?.Items == null || request.Items.Count == 0)
+                throw new ArgumentException("No records");
+
+            List<Diary> diaries = new List<Diary>();
+
+            foreach (var item in request.Items)
+            {
+                diaries.Add(new Diary
+                {
+                    Date = item.Date,
+                    NumberSubject = item.LessonNumber,
+                    StudentId = item.StudentId,
+                    TrafficId = item.TrafficId,
+                });
+            }
+
+            _presenceRepository.UpdatePresenceRecords(diaries);
+        }
+    }
+}

domain/UseCase/IAdminUseCase.cs

@@ -0,0 +1,10 @@
+using domain.Request;
+
+namespace domain.UseCase
+{
+    public interface IAdminUseCase
+    {
+        void AddStudentsToGroup(int groupId, AddStudentsToGroupRequest request);
+        void AddSubjectsToGroup(int groupId, AddSubjectsToGroupRequest request);
+    }
+}

domain/UseCase/IGroupUseCase.cs

@@ -0,0 +1,31 @@
+using domain.Entity;
+using domain.Request;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace domain.UseCase
+{
+    public interface IGroupUseCase
+    {
+        public bool AddGroup(AddGroupRequest addGroupRequest);
+
+        public void AddGroupWithStudents(AddGroupWithStudentRequest addGroupWithStudentRequest);
+
+        public void AddStudentsToGroup(int id, IEnumerable<AddStudentRequest> students);
+
+        public bool RemoveGroup(RemoveGroupRequest removeGroupRequest);
+
+        public void EditGroup(EditGroupRequest editGroupRequest);
+
+        public IEnumerable<GroupEntity> GetGroupsWithStudents();
+
+        public GroupSubjectEntity GetGroupSubject(int id);
+
+        public void RemoveStudentsFromGroup(int groupId);
+
+        public void RemoveStudentsFromGroupByIds(int groupId, IEnumerable<int> studentIds);
+    }
+}

domain/UseCase/IPresenceUseCase.cs

@@ -0,0 +1,21 @@
+using domain.Entity;
+using domain.Request;
+using System;
+using System.Collections.Generic;
+
+namespace domain.UseCase
+{
+    public interface IPresenceUseCase
+    {
+        IEnumerable<PresenceEntity> GetPresence(
+            int groupId,
+            int? subjectId = null,
+            DateOnly? date = null,
+            int? studentId = null);
+            
+        void DeleteAllPresence();
+        void DeleteGroupPresence(int groupId);
+        void AddPresenceRecords(AddPresenceRequest request);
+        void UpdatePresenceRecords(UpdatePresenceRequest request);
+    }
+}

domain/domain.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Response\**" />
+    <EmbeddedResource Remove="Response\**" />
+    <None Remove="Response\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\data\data.csproj" />
+  </ItemGroup>
+
+</Project>

presence.sln

@@ -0,0 +1,49 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "data", "data\data.csproj", "{BB350D5F-DE0B-465C-909F-6A179AA03C3A}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "console_ui", "console_ui\console_ui.csproj", "{BD6F5F76-9186-4301-8506-EB78220FA095}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "domain", "domain\domain.csproj", "{4D39120E-C021-4D38-BB4D-2F58BDE5FE17}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Presence.API", "Presence.API\Presence.API.csproj", "{88AE15FA-7E2D-4D7C-A75B-7DAC9742B32A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Presence.Desktop", "Presence.Desktop\Presence.Desktop.csproj", "{03BA523C-7C5B-4FE1-BAC1-461E4B4F7FCD}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BB350D5F-DE0B-465C-909F-6A179AA03C3A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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+		{BB350D5F-DE0B-465C-909F-6A179AA03C3A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BD6F5F76-9186-4301-8506-EB78220FA095}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BD6F5F76-9186-4301-8506-EB78220FA095}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BD6F5F76-9186-4301-8506-EB78220FA095}.Release|Any CPU.ActiveCfg = Release|Any CPU
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+		{4D39120E-C021-4D38-BB4D-2F58BDE5FE17}.Release|Any CPU.Build.0 = Release|Any CPU
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+		{88AE15FA-7E2D-4D7C-A75B-7DAC9742B32A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{88AE15FA-7E2D-4D7C-A75B-7DAC9742B32A}.Release|Any CPU.Build.0 = Release|Any CPU
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+	EndGlobalSection
+EndGlobal