I want a digest system for notifications on my phone. This used to be common for mailing lists and web forums with email notification systems. I could get an e

I want a digest system for notifications on my phone. This used to be common for mailing lists and web forums with email notification systems. I could get an email daily or weekly with the replies to my posts and subscriptions instead of real-time. The temptation to poll manually was reduced because I knew I'd be notified eventually. I want to be able to tell my phone to do the same with its notifications, preferably with fine-grained control. For messaging apps, it would be extra nice if the sender could mark a suggested priority so I could let certain people I trust not to abuse the privilege interrupt me when they think it's urgent enough.