Preparing for the History query

WotBlitzStatisticsPro.Common/Model/StatisticsDifference.cs

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+using System;
+
+namespace WotBlitzStatisticsPro.Common.Model
+{
+    /// <summary>
+    /// The difference between current statistics state and previous
+    /// </summary>
+    public class StatisticsDifference
+    {
+        ///<summary>
+        /// Last battle time
+        ///</summary>
+        public DateTime LastBattleTime { get; set; }
+
+        ///<summary>
+        /// Difference in Battles count
+        ///</summary>
+        public StatisticsDifferenceItem<long> Battles { get; set; }
+
+        /// <summary>
+        /// Difference in Average tier
+        /// </summary>
+        public StatisticsDifferenceItem<double> AvgTier { get; set; }
+
+        /// <summary>
+        /// Difference in Wn7 coefficient
+        /// </summary>
+        public StatisticsDifferenceItem<double> Wn7 { get; set; }
+
+        /// <summary>
+        /// Difference in Player's win rate
+        /// </summary>
+        public StatisticsDifferenceItem<decimal> WinRate { get; set; }
+
+        /// <summary>
+        /// Difference in Player's average damage
+        /// </summary>
+        public StatisticsDifferenceItem<decimal> AvgDamage { get; set; }
+
+        /// <summary>
+        /// Difference in Player's average XP
+        /// </summary>
+        public StatisticsDifferenceItem<decimal> AvgXp { get; set; }
+
+    }
+}