How can I know that a thread is changed

[Robert9]

Given: a thread with 100 posts

1) I move a post from this thread to another
2) I delete a post
3) I edit a post
4) I move a post from another thread with old date to this thread
5) I melt another thread to this thread

Anything forgotten?
Do we have any information that this thread is changed today?
How can I know that a thread is changed

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