Cannot send intent triggers to users after deleting tracker database?

Hi, I’m trying to develop a notification chatbot to a group of users on Telegram using external intent trigger. For some reason I can only send notifications after the user has started the conversation (by clicking the /start button on Telegram). I think this might be some kind of a restriction from Telegram or Rasa (the user has to start the conversation first). After some testing, I realized that sometimes I need to clear out the database, but after clearing I cannot send notifications to the users who already started the conversation on Telegram anymore. Is there any way to overcome this?

I don’t think this is a good use case for Rasa. It’s not really intended for this.