✨ Implement realtime chat

DysonNetwork.Sphere/Chat/RealtimeCall.cs

@@ -1,3 +1,9 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using DysonNetwork.Sphere.Chat.Realtime;
 using NodaTime;
 
 namespace DysonNetwork.Sphere.Chat;
@@ -5,11 +11,40 @@ namespace DysonNetwork.Sphere.Chat;
 public class RealtimeCall : ModelBase
 {
     public Guid Id { get; set; } = Guid.NewGuid();
-    public string? Title { get; set; }
     public Instant? EndedAt { get; set; }
-    
+
     public Guid SenderId { get; set; }
     public ChatMember Sender { get; set; } = null!;
     public Guid RoomId { get; set; }
     public ChatRoom Room { get; set; } = null!;
+
+    /// <summary>
+    /// Provider name (e.g., "cloudflare", "agora", "twilio")
+    /// </summary>
+    public string? ProviderName { get; set; }
+
+    /// <summary>
+    /// Service provider's session identifier
+    /// </summary>
+    public string? SessionId { get; set; }
+
+    /// <summary>
+    /// JSONB column containing provider-specific configuration
+    /// </summary>
+    [Column(name: "upstream", TypeName = "jsonb")]
+    public string? UpstreamConfigJson { get; set; }
+
+    /// <summary>
+    /// Deserialized upstream configuration
+    /// </summary>
+    [NotMapped]
+    public Dictionary<string, object> UpstreamConfig
+    {
+        get => string.IsNullOrEmpty(UpstreamConfigJson)
+            ? new Dictionary<string, object>()
+            : JsonSerializer.Deserialize<Dictionary<string, object>>(UpstreamConfigJson) ?? new Dictionary<string, object>();
+        set => UpstreamConfigJson = value.Count > 0 
+            ? JsonSerializer.Serialize(value) 
+            : null;
+    }
 }