Initial implementation

Lookup/Lookup.Database/IKeyEntity.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace Lookup.Database;
+
+/// <summary>
+/// Common interface for <see cref="IEntity"/> variants
+/// which reference <see cref="IValueEntity{TKey,TValue}"/> instances
+/// </summary>
+public interface IKeyEntity<TKey, TValue> : IEntity
+  where TKey : class, IKeyEntity<TKey, TValue>
+  where TValue : class, IValueEntity<TKey, TValue>
+{
+  /// <summary>
+  /// The referenced <see cref="IValueEntity{TKey,TValue}"/> instances
+  /// </summary>
+  DbSet<IValueEntity<TKey, TValue>> Values { get; }
+}