Lots of data and model setup

DCGEngine.Database/Models/BaseEntity.cs

@@ -10,7 +10,7 @@ public class BaseEntity<TKey> : ITimeTrackedEntity, IDbTrackedEntity
     [DatabaseGenerated(DatabaseGeneratedOption.None)]
     public virtual TKey Id { get; set; }
     
-    public DateTime? DateCreated { get; set; }
+    public DateTime DateCreated { get; set; } = DateTime.MinValue;
     
     public DateTime? DateUpdated { get; set; }
 }

DCGEngine.Database/Models/DeckEntry.cs

@@ -1,11 +1,13 @@
 using System.ComponentModel.DataAnnotations;
+using DCGEngine.Database.Interfaces;
+using Microsoft.EntityFrameworkCore;
 
 namespace DCGEngine.Database.Models;
 
 /// <summary>
 /// A deck consisting of multiple <see cref="CardEntry"/> stored in the DB.
 /// </summary>
-public abstract class DeckEntry : BaseEntity<long>
+public abstract class DeckEntry : BaseEntity<Guid>
 {
     /// <summary>
     /// How this deck is referred to internally.