** If the code shared below don’t work, then you can clear the table as per the screenshot i shared below
The database table becomes huge, it may be using either any SEO or Cache plugins ( my guess) you can see the size in the screenshot below, you can clear it as per the screenshot

also one.com provides this code which should clear the table within 7 days ( which was 30 days by default)
add_filter( 'action_scheduler_retention_period', 'onecom_action_scheduler_purge' );
/**
* Change Action Scheduler default purge to 1 week
*/
function onecom_action_scheduler_purge() {
return 604800;
}
you need to put this above code in function.php ( screenshot below)
