huge commit for advanced stats feature.

broke data out into its own library.
may be breaking changes with existing plugins

Data/Models/Client/Stats/EFClientRankingHistory.cs

@@ -0,0 +1,31 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Data.Models.Server;
+using Stats.Models;
+
+namespace Data.Models.Client.Stats
+{
+    public class EFClientRankingHistory: AuditFields
+    {
+        public const int MaxRankingCount = 30;
+        
+        [Key]
+        public long ClientRankingHistoryId { get; set; }
+        
+        [Required]
+        public int ClientId { get; set; }
+        
+        [ForeignKey(nameof(ClientId))]
+        public virtual EFClient Client { get; set; }
+        
+        public long? ServerId { get; set; }
+        
+        [ForeignKey(nameof(ServerId))]
+        public virtual EFServer Server { get; set; }
+        
+        public bool Newest { get; set; }
+        public int? Ranking { get; set; }
+        public double? ZScore { get; set; }
+        public double? PerformanceMetric { get; set; }
+    }
+}