fix: make username property not nullable

DatabaseModels/ScoreboardRecord.cs

@@ -5,7 +5,7 @@ namespace DatabaseModels;
 public class ScoreboardRecord
 {
     [Key]
-    public string? Username { get; set; }
+    public string Username { get; set; }
     public int Score { get; set; }
     
     public DateTime PostTime { get; set; }

Server/Migrations/20220716075243_NullableUsername.Designer.cs

@@ -0,0 +1,40 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Server.Data;
+
+#nullable disable
+
+namespace Server.Migrations
+{
+    [DbContext(typeof(ServerDbContext))]
+    [Migration("20220716075243_NullableUsername")]
+    partial class NullableUsername
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "6.0.6");
+
+            modelBuilder.Entity("DatabaseModels.ScoreboardRecord", b =>
+                {
+                    b.Property<string>("Username")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("PostTime")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("Score")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Username");
+
+                    b.ToTable("Scoreboard");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Server/Migrations/20220716075243_NullableUsername.cs

@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Server.Migrations
+{
+    public partial class NullableUsername : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}