Subscribe/unsubscribe from channels

flutter/lib/models/api_error.dart

@@ -1,7 +1,7 @@
 class APIError {
   final bool success;
   final int error;
-  final String errhighlight;
+  final int errhighlight;
   final String message;
 
   static final MISSING_UID = 1101;
@@ -67,7 +67,7 @@ class APIError {
     return APIError(
       success: json['success'] as bool,
       error: (json['error'] as num).toInt(),
-      errhighlight: json['errhighlight'] as String,
+      errhighlight: (json['errhighlight'] as num).toInt(),
       message: json['message'] as String,
     );
   }

flutter/lib/models/sender_name_statistics.dart

@@ -0,0 +1,26 @@
+class SenderNameStatistics {
+  final String name;
+  final String ts_last;
+  final String ts_first;
+  final int count;
+
+  const SenderNameStatistics({
+    required this.name,
+    required this.ts_last,
+    required this.ts_first,
+    required this.count,
+  });
+
+  factory SenderNameStatistics.fromJson(Map<String, dynamic> json) {
+    return SenderNameStatistics(
+      name: json['name'] as String,
+      ts_last: json['ts_last'] as String,
+      ts_first: json['ts_first'] as String,
+      count: json['count'] as int,
+    );
+  }
+
+  static List<SenderNameStatistics> fromJsonArray(List<dynamic> jsonArr) {
+    return jsonArr.map<SenderNameStatistics>((e) => SenderNameStatistics.fromJson(e as Map<String, dynamic>)).toList();
+  }
+}