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samples/SampleWebApi/Models/Models.cs

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+namespace SampleWebApi.Models;
+
+public class Product
+{
+    public int Id { get; set; }
+    public string Name { get; set; } = "";
+    public string Description { get; set; } = "";
+    public string Category { get; set; } = "";
+    public decimal Price { get; set; }
+    public int StockQuantity { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}
+
+public class Order
+{
+    public int Id { get; set; }
+    public string CustomerId { get; set; } = "";
+    public DateTime OrderDate { get; set; }
+    public decimal TotalAmount { get; set; }
+    public string Status { get; set; } = "";
+    public List<OrderItem> Items { get; set; } = new();
+}
+
+public class OrderItem
+{
+    public int Id { get; set; }
+    public int OrderId { get; set; }
+    public int ProductId { get; set; }
+    public int Quantity { get; set; }
+    public decimal UnitPrice { get; set; }
+    public decimal TotalPrice { get; set; }
+    
+    public Order Order { get; set; } = null!;
+    public Product Product { get; set; } = null!;
+}
+
+public class Customer
+{
+    public string Id { get; set; } = "";
+    public string Name { get; set; } = "";
+    public string Email { get; set; } = "";
+    public DateTime RegisteredAt { get; set; }
+    public List<Order> Orders { get; set; } = new();
+}
+
+public class PagedResult<T>
+{
+    public List<T> Items { get; set; } = new();
+    public int Page { get; set; }
+    public int PageSize { get; set; }
+    public int TotalCount { get; set; }
+    public int TotalPages => (int)Math.Ceiling(TotalCount / (double)PageSize);
+    public bool HasNextPage => Page < TotalPages;
+    public bool HasPreviousPage => Page > 1;
+}
+
+public class ProductStatistics
+{
+    public int TotalProducts { get; set; }
+    public decimal AveragePrice { get; set; }
+    public decimal MinPrice { get; set; }
+    public decimal MaxPrice { get; set; }
+    public Dictionary<string, int> ProductsByCategory { get; set; } = new();
+    public Dictionary<string, decimal> AveragePriceByCategory { get; set; } = new();
+    public long ComputationTimeMs { get; set; }
+    public string ComputationMethod { get; set; } = ""; // "InMemory" or "External"
+}
+
+public class CategoryRevenue
+{
+    public string Category { get; set; } = "";
+    public decimal TotalRevenue { get; set; }
+    public int OrderCount { get; set; }
+    public decimal AverageOrderValue { get; set; }
+}
+
+public class CustomerSummary
+{
+    public string CustomerId { get; set; } = "";
+    public string CustomerName { get; set; } = "";
+    public int TotalOrders { get; set; }
+    public decimal TotalSpent { get; set; }
+    public decimal AverageOrderValue { get; set; }
+    public DateTime FirstOrderDate { get; set; }
+    public DateTime LastOrderDate { get; set; }
+}
+
+public class RealTimeAnalytics
+{
+    public DateTime Timestamp { get; set; }
+    public int OrdersLastHour { get; set; }
+    public decimal RevenueLastHour { get; set; }
+    public int ActiveCustomers { get; set; }
+    public Dictionary<string, int> TopProductsLastHour { get; set; } = new();
+    public double OrdersPerMinute { get; set; }
+}
+
+public class BulkUpdateState
+{
+    public string OperationId { get; set; } = "";
+    public int ProcessedCount { get; set; }
+    public int UpdatedCount { get; set; }
+    public int FailedCount { get; set; }
+    public DateTime LastCheckpoint { get; set; }
+}
+
+public class ReportState
+{
+    public string ReportId { get; set; } = "";
+    public int ProgressPercent { get; set; }
+    public Dictionary<string, object> PartialResults { get; set; } = new();
+    public DateTime LastCheckpoint { get; set; }
+}
+
+public class PatternAnalysisResult
+{
+    public Dictionary<string, double> OrderPatterns { get; set; } = new();
+    public List<CustomerSegment> CustomerSegments { get; set; } = new();
+    public SeasonalAnalysis? SeasonalAnalysis { get; set; }
+    public long AnalysisTimeMs { get; set; }
+    public long RecordsProcessed { get; set; }
+    public long MemoryUsedMB { get; set; }
+}
+
+public class CustomerSegment
+{
+    public string SegmentName { get; set; } = "";
+    public int CustomerCount { get; set; }
+    public Dictionary<string, double> Characteristics { get; set; } = new();
+}
+
+public class SeasonalAnalysis
+{
+    public Dictionary<string, double> MonthlySalesPattern { get; set; } = new();
+    public Dictionary<string, double> WeeklySalesPattern { get; set; } = new();
+    public List<string> PeakPeriods { get; set; } = new();
+}
+
+public class MemoryStatistics
+{
+    public long CurrentMemoryUsageMB { get; set; }
+    public long PeakMemoryUsageMB { get; set; }
+    public int ExternalSortOperations { get; set; }
+    public int CheckpointsSaved { get; set; }
+    public long DataSpilledToDiskMB { get; set; }
+    public double CacheHitRate { get; set; }
+    public string CurrentMemoryPressure { get; set; } = "";
+}