In this article, we’ll learn how to build an event-based application and send a web-push notification when a particular event is triggered. We’ll set up database tables, events, and scheduled triggers on the Hasura GraphQL engine and wire up the GraphQL endpoint to the front-end application to record the stock price preference of the user.

https://smashingmagazine.com/2020/12/stocks-price-notifier-app-react-apollo-graphql-hasura/