Add platform grain

src/Managing.Api/Models/Responses/AgentSummaryViewModel.cs

@@ -71,6 +71,74 @@ namespace Managing.Api.Models.Responses
         /// Total volume traded across all agents in the last 24 hours in USD
         /// </summary>
         public decimal TotalPlatformVolumeLast24h { get; set; }
+        
+        /// <summary>
+        /// Total open interest across all positions in USD
+        /// </summary>
+        public decimal TotalOpenInterest { get; set; }
+        
+        /// <summary>
+        /// Total number of open positions across all strategies
+        /// </summary>
+        public int TotalPositionCount { get; set; }
+        
+        // 24-hour changes
+        /// <summary>
+        /// Change in agent count over the last 24 hours
+        /// </summary>
+        public int AgentsChange24h { get; set; }
+        
+        /// <summary>
+        /// Change in strategy count over the last 24 hours
+        /// </summary>
+        public int StrategiesChange24h { get; set; }
+        
+        /// <summary>
+        /// Change in PnL over the last 24 hours
+        /// </summary>
+        public decimal PnLChange24h { get; set; }
+        
+        /// <summary>
+        /// Change in volume over the last 24 hours
+        /// </summary>
+        public decimal VolumeChange24h { get; set; }
+        
+        /// <summary>
+        /// Change in open interest over the last 24 hours
+        /// </summary>
+        public decimal OpenInterestChange24h { get; set; }
+        
+        /// <summary>
+        /// Change in position count over the last 24 hours
+        /// </summary>
+        public int PositionCountChange24h { get; set; }
+        
+        // Breakdowns
+        /// <summary>
+        /// Volume breakdown by asset/ticker
+        /// </summary>
+        public Dictionary<string, decimal> VolumeByAsset { get; set; } = new();
+        
+        /// <summary>
+        /// Position count breakdown by asset/ticker
+        /// </summary>
+        public Dictionary<string, int> PositionCountByAsset { get; set; } = new();
+        
+        /// <summary>
+        /// Position count breakdown by direction (Long/Short)
+        /// </summary>
+        public Dictionary<string, int> PositionCountByDirection { get; set; } = new();
+        
+        // Metadata
+        /// <summary>
+        /// When the data was last updated
+        /// </summary>
+        public DateTime LastUpdated { get; set; }
+        
+        /// <summary>
+        /// When the last 24-hour snapshot was taken
+        /// </summary>
+        public DateTime Last24HourSnapshot { get; set; }
     }
     
     /// <summary>