Add customer communication system

LittleShop/Models/BotSession.cs

@@ -0,0 +1,44 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace LittleShop.Models;
+
+public class BotSession
+{
+    public Guid Id { get; set; }
+    
+    [Required]
+    public Guid BotId { get; set; }
+    
+    [Required]
+    [StringLength(256)]
+    public string SessionIdentifier { get; set; } = string.Empty; // Hashed user ID
+    
+    [StringLength(100)]
+    public string Platform { get; set; } = string.Empty; // Telegram, Discord, etc.
+    
+    public DateTime StartedAt { get; set; }
+    
+    public DateTime LastActivityAt { get; set; }
+    
+    public DateTime? EndedAt { get; set; }
+    
+    public int OrderCount { get; set; }
+    
+    public int MessageCount { get; set; }
+    
+    public decimal TotalSpent { get; set; }
+    
+    [StringLength(50)]
+    public string Language { get; set; } = "en";
+    
+    [StringLength(100)]
+    public string Country { get; set; } = string.Empty;
+    
+    public bool IsAnonymous { get; set; }
+    
+    public string Metadata { get; set; } = "{}"; // JSON for additional session data
+    
+    // Navigation property
+    public virtual Bot Bot { get; set; } = null!;
+}