profile_update hook doesn’t works inside a class

Careful where you are placing your brackets.

The hook should look like;

add_action('profile_update', array( $this, 'user_profile_update' ), 10, 2 );

Note the close bracket after the method name

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