fixup! Add basic skin database model layout and importing

osu.Game/Skinning/SkinStore.cs

@@ -1,6 +1,8 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System.Linq;
+using Microsoft.EntityFrameworkCore;
 using osu.Framework.Platform;
 using osu.Game.Database;
 
@@ -12,5 +14,9 @@ namespace osu.Game.Skinning
             : base(contextFactory, storage)
         {
         }
+
+        protected override IQueryable<SkinInfo> AddIncludesForConsumption(IQueryable<SkinInfo> query) =>
+            base.AddIncludesForConsumption(query)
+                .Include(s => s.Files).ThenInclude(f => f.FileInfo);
     }
 }