Создал и применил миграцию AddUserEntity

Lesson49/Migrations/20210331150233_AddUserEntity.Designer.cs

+// <auto-generated />
+using Lesson49.Models.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace Lesson49.Migrations
+{
+    [DbContext(typeof(MobileContext))]
+    [Migration("20210331150233_AddUserEntity")]
+    partial class AddUserEntity
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "3.1.13");
+
+            modelBuilder.Entity("Lesson49.Models.Brand", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("WebSite")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Brands");
+                });
+
+            modelBuilder.Entity("Lesson49.Models.Order", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Address")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ContactPhone")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("PhoneId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PhoneId");
+
+                    b.ToTable("Orders");
+                });
+
+            modelBuilder.Entity("Lesson49.Models.Phone", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("BrandId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<double>("Price")
+                        .HasColumnType("REAL");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BrandId");
+
+                    b.ToTable("Phones");
+                });
+
+            modelBuilder.Entity("Lesson49.Models.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("Age")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Surname")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("Lesson49.Models.Order", b =>
+                {
+                    b.HasOne("Lesson49.Models.Phone", "Phone")
+                        .WithMany()
+                        .HasForeignKey("PhoneId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Lesson49.Models.Phone", b =>
+                {
+                    b.HasOne("Lesson49.Models.Brand", "Brand")
+                        .WithMany()
+                        .HasForeignKey("BrandId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Lesson49/Migrations/20210331150233_AddUserEntity.cs

+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Lesson49.Migrations
+{
+    public partial class AddUserEntity : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Users",
+                columns: table => new
+                {
+                    Id = table.Column<int>(nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    Name = table.Column<string>(nullable: true),
+                    Surname = table.Column<string>(nullable: true),
+                    Age = table.Column<int>(nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Users", x => x.Id);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Users");
+        }
+    }
+}

Lesson49/Migrations/MobileContextModelSnapshot.cs

@@ -85,6 +85,26 @@ namespace Lesson49.Migrations
                     b.ToTable("Phones");
                 });
 
+            modelBuilder.Entity("Lesson49.Models.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("Age")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Surname")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
             modelBuilder.Entity("Lesson49.Models.Order", b =>
                 {
                     b.HasOne("Lesson49.Models.Phone", "Phone")