A useful model utility library for Django - Django Lifecycle Hooks

[bibekme]

This one's similar to signals. In fact, it is built on top of signals. It provides an abstraction over signals and adds a few more useful functionalities like subscriptions for foreign key changes, and specific field level changes...

https://rsinger86.github.io/django-lifecycle/

[acpmasquerade]

Also for signals we have to be sure that signals are synchronous, and anything that's non-contingent after some error in signal execution can be unfavorable.