Updates

DCGEngine.Database/Models/BaseEntity.cs

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+using System.ComponentModel.DataAnnotations;
+using DCGEngine.Database.Interfaces;
+
+namespace DCGEngine.Database.Models;
+
+public class BaseEntity<TKey> : ITimeTrackedEntity, IDbTrackedEntity
+{
+    [Key]
+    public virtual TKey Id { get; set; }
+    
+    public DateTime? DateCreated { get; set; }
+    
+    public DateTime? DateUpdated { get; set; }
+}

DCGEngine.Database/Models/CardEntry.cs

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+namespace DCGEngine.Database.Models;
+
+/// <summary>
+/// A card within the system.
+/// </summary>
+public abstract class CardEntry : BaseEntity<long>
+{
+    /// <summary>
+    /// The name of this card used internally, to separate it from any localization key stored.
+    /// </summary>
+    public virtual string InternalName { get; set; }
+    
+    /// <summary>
+    /// The offensive power of this card.
+    /// </summary>
+    public virtual int? Attack { get; set; }
+    
+    /// <summary>
+    /// The defensive power of this card.
+    /// </summary>
+    public virtual int? Defense { get; set; }
+    
+    /// <summary>
+    /// How much of the primary resource (ie mana, energy) does this card cost to play in a match.
+    /// </summary>
+    public virtual int? PrimaryResourceCost { get; set; }
+}

DCGEngine.Database/Models/DeckEntry.cs

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+namespace DCGEngine.Database.Models;
+
+/// <summary>
+/// A deck consisting of multiple <see cref="CardEntry"/> stored in the DB.
+/// </summary>
+public abstract class DeckEntry : BaseEntity<long>
+{
+    /// <summary>
+    /// How this deck is referred to internally.
+    /// </summary>
+    public virtual string InternalName { get; set; }
+    
+    /// <summary>
+    /// The cards present in this deck.
+    /// </summary>
+    public virtual List<CardEntry> Cards { get; set; }
+}