Добавьте файлы проекта.

data/Context/ApplicationDbContext.cs

@@ -0,0 +1,56 @@
+using data.DAO;
+using Microsoft.EntityFrameworkCore;
+
+namespace data.Context
+{
+    public class ApplicationDbContext : DbContext
+    {
+        public DbSet<Student> Students { get; set; }
+        public DbSet<Group> Groups { get; set; }
+        public DbSet<Subject> Subjects { get; set; }
+        public DbSet<Semester> Semesters { get; set; }
+        public DbSet<Lesson> Lessons { get; set; }
+        public DbSet<Attendance> Attendances { get; set; }
+
+  
+
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Student>()
+                .HasOne(s => s.Group)
+                .WithMany(g => g.Students)
+                .HasForeignKey(s => s.GroupId);
+
+            modelBuilder.Entity<Lesson>()
+                .HasOne(l => l.Subject)
+                .WithMany(s => s.Lessons)
+                .HasForeignKey(l => l.SubjectId);
+
+            modelBuilder.Entity<Lesson>()
+                .HasOne(l => l.Semester)
+                .WithMany(s => s.Lessons)
+                .HasForeignKey(l => l.SemesterId);
+
+            modelBuilder.Entity<Lesson>()
+                .HasOne(l => l.Group)
+                .WithMany(g => g.Lessons)
+                .HasForeignKey(l => l.GroupId);
+
+            modelBuilder.Entity<Attendance>()
+                .HasOne(a => a.Student)
+                .WithMany(s => s.Attendances)
+                .HasForeignKey(a => a.StudentId);
+
+            modelBuilder.Entity<Attendance>()
+                .HasOne(a => a.Lesson)
+                .WithMany(l => l.Attendances)
+                .HasForeignKey(a => a.LessonId);
+        }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            optionsBuilder.UseNpgsql("Host=45.67.56.214;Database=user17;Username=user17;Password=3JSONQyy;Port=5454");
+        }
+    }
+}

data/DAO/Attendance.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Attendance
+    {
+        public int Id { get; set; }
+        public int StudentId { get; set; }
+        public Student Student { get; set; }
+        public int LessonId { get; set; }
+        public Lesson Lesson { get; set; }
+        public string Status { get; set; }
+    }
+}

data/DAO/Group.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Group
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public ICollection<Student> Students { get; set; }
+        public ICollection<Lesson> Lessons { get; set; }
+    }
+}

data/DAO/Lesson.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Lesson
+    {
+        public int Id { get; set; }
+        public int SubjectId { get; set; }
+        public Subject Subject { get; set; }
+        public int SemesterId { get; set; }
+        public Semester Semester { get; set; }
+        public int GroupId { get; set; }
+        public Group Group { get; set; }
+        public DateTime Date { get; set; }
+        public int LessonNumber { get; set; }
+        public ICollection<Attendance> Attendances { get; set; }
+    }
+}

data/DAO/Semester.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Semester
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public ICollection<Lesson> Lessons { get; set; }
+    }
+}

data/DAO/Student.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Student
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public int GroupId { get; set; }
+        public Group Group { get; set; }
+        public ICollection<Attendance> Attendances { get; set; }
+    }
+}

data/DAO/Subject.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace data.DAO
+{
+    public class Subject
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public ICollection<Lesson> Lessons { get; set; }
+    }
+}

data/Migrations/20241120125823_InitialCreate.Designer.cs

@@ -0,0 +1,248 @@
+// <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.Context;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    [Migration("20241120125823_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.Attendance", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("LessonId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("LessonId");
+
+                    b.HasIndex("StudentId");
+
+                    b.ToTable("Attendances");
+                });
+
+            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.Lesson", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("Date")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("LessonNumber")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("SemesterId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("Lessons");
+                });
+
+            modelBuilder.Entity("data.DAO.Semester", 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("Semesters");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            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.Attendance", b =>
+                {
+                    b.HasOne("data.DAO.Lesson", "Lesson")
+                        .WithMany("Attendances")
+                        .HasForeignKey("LessonId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Student", "Student")
+                        .WithMany("Attendances")
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Lesson");
+
+                    b.Navigation("Student");
+                });
+
+            modelBuilder.Entity("data.DAO.Lesson", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany("Lessons")
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Semester", "Semester")
+                        .WithMany("Lessons")
+                        .HasForeignKey("SemesterId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany("Lessons")
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Semester");
+
+                    b.Navigation("Subject");
+                });
+
+            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.Group", b =>
+                {
+                    b.Navigation("Lessons");
+
+                    b.Navigation("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.Lesson", b =>
+                {
+                    b.Navigation("Attendances");
+                });
+
+            modelBuilder.Entity("data.DAO.Semester", b =>
+                {
+                    b.Navigation("Lessons");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Navigation("Attendances");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Navigation("Lessons");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/Migrations/20241120125823_InitialCreate.cs

@@ -0,0 +1,189 @@
+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: "Semesters",
+                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_Semesters", 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: "Students",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Name = 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: "Lessons",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    SubjectId = table.Column<int>(type: "integer", nullable: false),
+                    SemesterId = table.Column<int>(type: "integer", nullable: false),
+                    GroupId = table.Column<int>(type: "integer", nullable: false),
+                    Date = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
+                    LessonNumber = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Lessons", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Lessons_Groups_GroupId",
+                        column: x => x.GroupId,
+                        principalTable: "Groups",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Lessons_Semesters_SemesterId",
+                        column: x => x.SemesterId,
+                        principalTable: "Semesters",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Lessons_Subjects_SubjectId",
+                        column: x => x.SubjectId,
+                        principalTable: "Subjects",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Attendances",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    StudentId = table.Column<int>(type: "integer", nullable: false),
+                    LessonId = table.Column<int>(type: "integer", nullable: false),
+                    Status = table.Column<string>(type: "text", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Attendances", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Attendances_Lessons_LessonId",
+                        column: x => x.LessonId,
+                        principalTable: "Lessons",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Attendances_Students_StudentId",
+                        column: x => x.StudentId,
+                        principalTable: "Students",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Attendances_LessonId",
+                table: "Attendances",
+                column: "LessonId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Attendances_StudentId",
+                table: "Attendances",
+                column: "StudentId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Lessons_GroupId",
+                table: "Lessons",
+                column: "GroupId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Lessons_SemesterId",
+                table: "Lessons",
+                column: "SemesterId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Lessons_SubjectId",
+                table: "Lessons",
+                column: "SubjectId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Students_GroupId",
+                table: "Students",
+                column: "GroupId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Attendances");
+
+            migrationBuilder.DropTable(
+                name: "Lessons");
+
+            migrationBuilder.DropTable(
+                name: "Students");
+
+            migrationBuilder.DropTable(
+                name: "Semesters");
+
+            migrationBuilder.DropTable(
+                name: "Subjects");
+
+            migrationBuilder.DropTable(
+                name: "Groups");
+        }
+    }
+}

data/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -0,0 +1,245 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using data.Context;
+
+#nullable disable
+
+namespace data.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    partial class ApplicationDbContextModelSnapshot : 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.Attendance", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("LessonId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("LessonId");
+
+                    b.HasIndex("StudentId");
+
+                    b.ToTable("Attendances");
+                });
+
+            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.Lesson", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("Date")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("LessonNumber")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SemesterId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SubjectId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.HasIndex("SemesterId");
+
+                    b.HasIndex("SubjectId");
+
+                    b.ToTable("Lessons");
+                });
+
+            modelBuilder.Entity("data.DAO.Semester", 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("Semesters");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("GroupId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("GroupId");
+
+                    b.ToTable("Students");
+                });
+
+            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.Attendance", b =>
+                {
+                    b.HasOne("data.DAO.Lesson", "Lesson")
+                        .WithMany("Attendances")
+                        .HasForeignKey("LessonId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Student", "Student")
+                        .WithMany("Attendances")
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Lesson");
+
+                    b.Navigation("Student");
+                });
+
+            modelBuilder.Entity("data.DAO.Lesson", b =>
+                {
+                    b.HasOne("data.DAO.Group", "Group")
+                        .WithMany("Lessons")
+                        .HasForeignKey("GroupId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Semester", "Semester")
+                        .WithMany("Lessons")
+                        .HasForeignKey("SemesterId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("data.DAO.Subject", "Subject")
+                        .WithMany("Lessons")
+                        .HasForeignKey("SubjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Group");
+
+                    b.Navigation("Semester");
+
+                    b.Navigation("Subject");
+                });
+
+            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.Group", b =>
+                {
+                    b.Navigation("Lessons");
+
+                    b.Navigation("Students");
+                });
+
+            modelBuilder.Entity("data.DAO.Lesson", b =>
+                {
+                    b.Navigation("Attendances");
+                });
+
+            modelBuilder.Entity("data.DAO.Semester", b =>
+                {
+                    b.Navigation("Lessons");
+                });
+
+            modelBuilder.Entity("data.DAO.Student", b =>
+                {
+                    b.Navigation("Attendances");
+                });
+
+            modelBuilder.Entity("data.DAO.Subject", b =>
+                {
+                    b.Navigation("Lessons");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

data/data.csproj

@@ -0,0 +1,22 @@
+<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">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" 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>

desktop.ini

@@ -0,0 +1,2 @@
+[LocalizedFileNames]
+presence.sln=@presence.sln,0

presence.sln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "data", "data\data.csproj", "{74567B9C-DFD3-4878-9DF8-41F8556F2D91}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{74567B9C-DFD3-4878-9DF8-41F8556F2D91}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{74567B9C-DFD3-4878-9DF8-41F8556F2D91}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{74567B9C-DFD3-4878-9DF8-41F8556F2D91}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{74567B9C-DFD3-4878-9DF8-41F8556F2D91}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal