How to write into table when the task assignee is changed

Certified Associate Developer

We got a traditional task based process running in production. Currently the users don't know the assignee of a task.

How do I write into a table as soon as

 * the task assignee changed 

 * the task is accepted by someone in a group ?

( We can design a wait event in process, which will write into DB as soon as the task assignee is changed. But this is memory consuming approach as the event is always active.

I'm looking for any better approaches)

Thanks everyone

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