Add initial database context and first entity

Data/Migrations/20220603063002_Initial.cs

@@ -0,0 +1,40 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Diary.Data.Migrations
+{
+    public partial class Initial : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.EnsureSchema(
+                name: "Diary");
+
+            migrationBuilder.CreateTable(
+                name: "Entries",
+                schema: "Diary",
+                columns: table => new
+                {
+                    EnrtyID = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    Date = table.Column<DateTime>(type: "Date", nullable: false),
+                    ValidFrom = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    ValidTo = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    Note = table.Column<string>(type: "nvarchar(max)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Entries", x => x.EnrtyID);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Entries",
+                schema: "Diary");
+        }
+    }
+}