migrations

Tsi1.Api/Tsi1.DataLayer/Migrations/20201115152033_add-communication-entity.Designer.cs

+// <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 Tsi1.DataLayer;
+
+namespace Tsi1.DataLayer.Migrations
+{
+    [DbContext(typeof(Tsi1Context))]
+    [Migration("20201115152033_add-communication-entity")]
+    partial class addcommunicationentity
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn)
+                .HasAnnotation("ProductVersion", "3.1.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.AnswerOption", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(100)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name");
+
+                    b.ToTable("AnswerOptions");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Communication", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int?>("CourseId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Text")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("ValidUntil")
+                        .HasColumnType("timestamp without time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CourseId");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("Communication");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Connection", b =>
+                {
+                    b.Property<string>("ConnectionId")
+                        .HasColumnType("text");
+
+                    b.Property<string>("GroupName")
+                        .HasColumnType("text");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("ConnectionId");
+
+                    b.HasIndex("GroupName");
+
+                    b.ToTable("Connections");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Course", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<bool>("IsTemplate")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<int>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("Name", "TenantId")
+                        .IsUnique();
+
+                    b.ToTable("Courses");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.File", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("Path")
+                        .IsRequired()
+                        .HasColumnType("character varying(1000)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Path")
+                        .IsUnique();
+
+                    b.ToTable("Files");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Forum", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Forums");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.ForumUser", b =>
+                {
+                    b.Property<int>("ForumId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("ForumId", "UserId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("ForumUsers");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Group", b =>
+                {
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.HasKey("Name");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Post", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<DateTime>("Date")
+                        .HasColumnType("timestamp without time zone");
+
+                    b.Property<int>("ForumId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.HasIndex("ForumId", "Title")
+                        .IsUnique();
+
+                    b.ToTable("Posts");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.PostMessage", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Content")
+                        .IsRequired()
+                        .HasColumnType("character varying(10485760)");
+
+                    b.Property<DateTime>("Date")
+                        .HasColumnType("timestamp without time zone");
+
+                    b.Property<int>("PostId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PostId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("PostMessages");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Professor", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("IdentityCard")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<int>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("IdentityCard", "TenantId")
+                        .IsUnique();
+
+                    b.ToTable("Professors");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.ProfessorCourse", b =>
+                {
+                    b.Property<int>("ProfessorId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("CourseId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("ProfessorId", "CourseId");
+
+                    b.HasIndex("CourseId");
+
+                    b.ToTable("ProfessorCourses");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Section", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int>("CourseId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<int>("Order")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CourseId");
+
+                    b.ToTable("Sections");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SectionItem", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int?>("FileId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("ForumId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("Order")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SectionId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SectionItemTypeId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("SurveyId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("FileId")
+                        .IsUnique();
+
+                    b.HasIndex("ForumId")
+                        .IsUnique();
+
+                    b.HasIndex("SectionId");
+
+                    b.HasIndex("SectionItemTypeId");
+
+                    b.HasIndex("SurveyId")
+                        .IsUnique();
+
+                    b.ToTable("SectionItems");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SectionItemType", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(100)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("SectionItemTypes");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int>("Age")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("IdentityCard")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<int>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("IdentityCard", "TenantId")
+                        .IsUnique();
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.StudentCourse", b =>
+                {
+                    b.Property<int>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("CourseId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("StudentId", "CourseId");
+
+                    b.HasIndex("CourseId");
+
+                    b.ToTable("StudentCourses");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Survey", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<bool>("IsGlobal")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<int?>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("Surveys");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyAnswer", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int>("AnswerOptionId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SurveyQuestionId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("SurveyResponseId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AnswerOptionId");
+
+                    b.HasIndex("SurveyQuestionId");
+
+                    b.HasIndex("SurveyResponseId");
+
+                    b.ToTable("SurveyAnswers");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyQuestion", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Question")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<int>("SurveyId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("SurveyId");
+
+                    b.ToTable("SurveyQuestions");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyResponse", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int>("SurveyId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("SurveyId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("SurveyResponses");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Tenant", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name")
+                        .IsUnique();
+
+                    b.ToTable("Tenants");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Email")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<string>("Password")
+                        .IsRequired()
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<int?>("ProfessorId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("StudentId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("UserTypeId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ProfessorId")
+                        .IsUnique();
+
+                    b.HasIndex("StudentId")
+                        .IsUnique();
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("UserTypeId");
+
+                    b.HasIndex("Username", "TenantId")
+                        .IsUnique();
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.UserType", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("character varying(50)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name")
+                        .IsUnique();
+
+                    b.ToTable("UserTypes");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Communication", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Course", "Course")
+                        .WithMany("Communications")
+                        .HasForeignKey("CourseId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Communications")
+                        .HasForeignKey("TenantId");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Connection", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Group", "Group")
+                        .WithMany("Connections")
+                        .HasForeignKey("GroupName");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Course", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Courses")
+                        .HasForeignKey("TenantId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.ForumUser", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Forum", "Forum")
+                        .WithMany("ForumUsers")
+                        .HasForeignKey("ForumId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.User", "User")
+                        .WithMany("ForumUsers")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Post", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Forum", "Forum")
+                        .WithMany("Posts")
+                        .HasForeignKey("ForumId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.User", "User")
+                        .WithMany("Posts")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.PostMessage", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Post", "Post")
+                        .WithMany("PostMessages")
+                        .HasForeignKey("PostId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.User", "User")
+                        .WithMany("PostMessages")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Professor", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Professors")
+                        .HasForeignKey("TenantId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.ProfessorCourse", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Course", "Course")
+                        .WithMany("ProfessorCourses")
+                        .HasForeignKey("CourseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Professor", "Professor")
+                        .WithMany("ProfessorCourses")
+                        .HasForeignKey("ProfessorId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Section", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Course", "Course")
+                        .WithMany("Sections")
+                        .HasForeignKey("CourseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SectionItem", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.File", "File")
+                        .WithOne("SectionItem")
+                        .HasForeignKey("Tsi1.DataLayer.Entities.SectionItem", "FileId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Forum", "Forum")
+                        .WithOne("SectionItem")
+                        .HasForeignKey("Tsi1.DataLayer.Entities.SectionItem", "ForumId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Section", "Section")
+                        .WithMany("SectionItems")
+                        .HasForeignKey("SectionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.SectionItemType", "SectionItemType")
+                        .WithMany("SectionItems")
+                        .HasForeignKey("SectionItemTypeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Survey", "Survey")
+                        .WithOne("SectionItem")
+                        .HasForeignKey("Tsi1.DataLayer.Entities.SectionItem", "SurveyId");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Student", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Students")
+                        .HasForeignKey("TenantId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.StudentCourse", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Course", "Course")
+                        .WithMany("StudentCourses")
+                        .HasForeignKey("CourseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Student", "Student")
+                        .WithMany("StudentCourses")
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Survey", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Surveys")
+                        .HasForeignKey("TenantId");
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyAnswer", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.AnswerOption", "AnswerOption")
+                        .WithMany("SurveyAnswers")
+                        .HasForeignKey("AnswerOptionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.SurveyQuestion", "SurveyQuestion")
+                        .WithMany("SurveyAnswers")
+                        .HasForeignKey("SurveyQuestionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.SurveyResponse", "SurveyResponse")
+                        .WithMany("SurveyAnswers")
+                        .HasForeignKey("SurveyResponseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyQuestion", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Survey", "Survey")
+                        .WithMany("SurveyQuestions")
+                        .HasForeignKey("SurveyId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.SurveyResponse", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Survey", "Survey")
+                        .WithMany("SurveyResponses")
+                        .HasForeignKey("SurveyId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.User", "User")
+                        .WithMany("SurveyResponses")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.User", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Professor", "Professor")
+                        .WithOne("User")
+                        .HasForeignKey("Tsi1.DataLayer.Entities.User", "ProfessorId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Student", "Student")
+                        .WithOne("User")
+                        .HasForeignKey("Tsi1.DataLayer.Entities.User", "StudentId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Users")
+                        .HasForeignKey("TenantId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Tsi1.DataLayer.Entities.UserType", "UserType")
+                        .WithMany()
+                        .HasForeignKey("UserTypeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Tsi1.Api/Tsi1.DataLayer/Migrations/20201115152033_add-communication-entity.cs

+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+namespace Tsi1.DataLayer.Migrations
+{
+    public partial class addcommunicationentity : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Communication",
+                columns: table => new
+                {
+                    Id = table.Column<int>(nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Text = table.Column<string>(nullable: true),
+                    ValidUntil = table.Column<DateTime>(nullable: false),
+                    CourseId = table.Column<int>(nullable: true),
+                    TenantId = table.Column<int>(nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Communication", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Communication_Courses_CourseId",
+                        column: x => x.CourseId,
+                        principalTable: "Courses",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_Communication_Tenants_TenantId",
+                        column: x => x.TenantId,
+                        principalTable: "Tenants",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Communication_CourseId",
+                table: "Communication",
+                column: "CourseId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Communication_TenantId",
+                table: "Communication",
+                column: "TenantId");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Communication");
+        }
+    }
+}

Tsi1.Api/Tsi1.DataLayer/Migrations/Tsi1ContextModelSnapshot.cs

@@ -37,6 +37,34 @@ namespace Tsi1.DataLayer.Migrations
                     b.ToTable("AnswerOptions");
                 });
 
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Communication", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<int?>("CourseId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("TenantId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Text")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("ValidUntil")
+                        .HasColumnType("timestamp without time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CourseId");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("Communication");
+                });
+
             modelBuilder.Entity("Tsi1.DataLayer.Entities.Connection", b =>
                 {
                     b.Property<string>("ConnectionId")
@@ -560,6 +588,17 @@ namespace Tsi1.DataLayer.Migrations
                     b.ToTable("UserTypes");
                 });
 
+            modelBuilder.Entity("Tsi1.DataLayer.Entities.Communication", b =>
+                {
+                    b.HasOne("Tsi1.DataLayer.Entities.Course", "Course")
+                        .WithMany("Communications")
+                        .HasForeignKey("CourseId");
+
+                    b.HasOne("Tsi1.DataLayer.Entities.Tenant", "Tenant")
+                        .WithMany("Communications")
+                        .HasForeignKey("TenantId");
+                });
+
             modelBuilder.Entity("Tsi1.DataLayer.Entities.Connection", b =>
                 {
                     b.HasOne("Tsi1.DataLayer.Entities.Group", "Group")