fix delete command, add count command to channel helper

bots/modules/channel_helper.py

@@ -126,14 +126,20 @@ class ChannelHelperBotModuleConfig(TelegramBotModuleConfig):
             return
         reply_to_id = update.effective_message.reply_to_message.message_id
         try:
-            msg = QueuedItem.objects.get(message_id=reply_to_id)
+            msg = QueuedItem.objects.get(message_id=reply_to_id, config=self)
             msg.delete()
         except QueuedItem.DoesNotExist:
             update.effective_message.reply_text('Deleted')
 
+    def handle_count(self, update: Update, ctx: CallbackContext):
+        if update.effective_message.chat_id != self.chat_id:
+            return
+        update.effective_message.reply_text(f'{QueuedItem.objects.filter(config=self).count()} items queued')
+
     def build_dispatcher(self, dispatcher: Dispatcher):
-        dispatcher.add_handler(MessageHandler(Filters.private, self.handle_message))
         dispatcher.add_handler(CommandHandler(['delete', 'del', 'remove', 'rem'], self.handle_delete, Filters.reply))
+        dispatcher.add_handler(CommandHandler(['count'], self.handle_count))
+        dispatcher.add_handler(MessageHandler(Filters.private, self.handle_message))
         return dispatcher