✨ Improvement of file processing and video snapshot

DysonNetwork.Sphere/Chat/ChatRoom.cs

@@ -74,7 +74,7 @@ public class ChatMember : ModelBase
     public Guid ChatRoomId { get; set; }
     public ChatRoom ChatRoom { get; set; } = null!;
     public Guid AccountId { get; set; }
-    [NotMapped] public Account Account { get; set; } = null!;
+    [NotMapped] public Account? Account { get; set; }
 
     [MaxLength(1024)] public string? Nick { get; set; }
 

DysonNetwork.Sphere/Chat/ChatService.cs

@@ -260,7 +260,8 @@ public partial class ChatService(
             }
             else if (member.Notify == ChatMemberNotify.Mentions) continue;
 
-            accountsToNotify.Add(member.Account.ToProtoValue());
+            if (member.Account is not null)
+                accountsToNotify.Add(member.Account.ToProtoValue());
         }
 
         logger.LogInformation($"Trying to deliver message to {accountsToNotify.Count} accounts...");
@@ -596,4 +597,4 @@ public class SyncResponse
 {
     public List<MessageChange> Changes { get; set; } = [];
     public Instant CurrentTimestamp { get; set; }
-}
+}