How to update the value of a column in my table when the current tab close or navigate to another page?

I have a page and I named it to mypage.php. I have a table MyTable with a column STATUS. I want to update the status to T when the user enters to the page and change to F when the user leaves or close from the page. I tried with onbeforeunload with JS. Help me any way. Thanks in advance.

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