Basics setup, going to change how repos work

DBConnection/ModelBuilders/IModelBuilder.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace DBConnection.Interfaces;
+
+/// <summary>
+/// ModelBuilders are used for customizing DB models with properties not settable via annotations
+/// </summary>
+public interface IModelBuilder
+{
+    public ModelBuilder BuildModel(ModelBuilder builder);
+}

DBConnection/ModelBuilders/UserNovelBuilder.cs

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+using DBConnection.Interfaces;
+using DBConnection.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace DBConnection.ModelBuilders;
+
+public class UserNovelBuilder : IModelBuilder
+{
+    public ModelBuilder BuildModel(ModelBuilder builder)
+    {
+        var userNovelModelBuilder = builder.Entity<UserNovel>();
+        userNovelModelBuilder.HasKey(un => new {un.NovelUrl, un.UserId});
+        return builder;
+    }
+}