Has the table name in SQL for WordPress changed from WP_posts to WPCS_post?

It’s not a new name. The database prefix is configurable during install. By default it’s wp_, but in this case it just happens to have been configured to wpcs_.

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