Add project files.

DatamodelLibrary/Migrations/20210316200448_backupregister.cs

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+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace DatamodelLibrary.Migrations
+{
+    public partial class backupregister : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "BackupRegings",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    BackedUp = table.Column<DateTime>(type: "TEXT", nullable: false),
+                    DbName = table.Column<string>(type: "TEXT", nullable: true),
+                    BackupDbName = table.Column<string>(type: "TEXT", nullable: true),
+                    BackupPath = table.Column<string>(type: "TEXT", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_BackupRegings", x => x.Id);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "BackupRegings");
+        }
+    }
+}