fix get event request json

lib/models/requests/get_event_request.dart

@@ -3,14 +3,21 @@ import "package:nexus/models/room.dart";
 part "get_event_request.freezed.dart";
 part "get_event_request.g.dart";
 
-@freezed
+@Freezed(toJson: false)
 abstract class GetEventRequest with _$GetEventRequest {
+  const GetEventRequest._();
   const factory GetEventRequest({
     required Room room,
     required String eventId,
     @Default(false) bool unredact,
   }) = _GetEventRequest;
 
+  Map<String, dynamic> toJson() => {
+    "room_id": room.metadata?.id,
+    "event_id": eventId,
+    "unredact": unredact,
+  };
+
   factory GetEventRequest.fromJson(Map<String, Object?> json) =>
       _$GetEventRequestFromJson(json);
 }