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Your PHP Native Sessions table is missing a primary key. Please run wp pantheon session add-index and verify that the process completes successfully and that this message goes away to resolve this issue on your live environment.
I run the command in my server
wp pantheon session add-index –path=/var/www/project
but my site CSS is broken so I reverted it:
wp pantheon session primary-key-revert –path=/var/www/project
So how to proceed with it? Rollback to old version?