https://github.com/novuhq/novu?utm_source=chatgpt.com
https://github.com/turms-im/turms
https://www.systemdesigninterview.io/blog/notification-system
https://grokkingthesystemdesign.com/guides/notification-service-system-design
왓츠앱 디자인
딥위키 novu
딥위키 turms