publish_post plugin hook doesn’t always pass $post->post_content

No, no hook for this requirement. But the hook save_postworks on all changes and you can check for the current status and do it only, the status is in the right value as your requirement.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)