if (!function_exists('dk_auto_assign_author')) {
    function dk_auto_assign_author($post_id, $post, $update) {
        if (wp_is_post_revision($post_id) || wp_is_post_autosave($post_id)) return;
        if ($post->post_status !== 'publish') return;
        if (!in_array($post->post_type, array('post', 'page'), true)) return;
        if (get_post_meta($post_id, '_dk_author_routed', true)) return;

        $term_to_duo = array(
            28 => 'adhd_mental',     // ADHD & Focus
            29 => 'adhd_mental',     // Mental Health
            30 => 'parenting_single',// Parenting Tips
            33 => 'parenting_single',// Single-Parent Life
            31 => 'tools_books',     // Tools & Apps
            32 => 'tools_books',     // Books & Guides
        );
        $duo_users = array(
            'adhd_mental'      => array(4, 5), // Marcus Webb (M), Sofia Moreau (F)
            'parenting_single' => array(9, 6), // Diego Rivera (M), Nour El-Rashidi (F)
            'tools_books'      => array(7, 8), // Tyler Brooks (M), Mei Lin Foster (F)
        );

        $term_ids = wp_get_object_terms($post_id, 'category', array('fields' => 'ids'));
        if (is_wp_error($term_ids) || empty($term_ids)) return;

        $duo_key = null;
        foreach ($term_ids as $tid) {
            if (isset($term_to_duo[$tid])) { $duo_key = $term_to_duo[$tid]; break; }
        }
        if (!$duo_key) return;

        $alt = get_option('dk_author_alternation', array());
        $last = isset($alt[$duo_key]) ? $alt[$duo_key] : -1;
        $next = ($last === -1) ? 0 : 1 - $last;
        $author_id = $duo_users[$duo_key][$next];

        global $wpdb;
        $wpdb->update($wpdb->posts, array('post_author' => $author_id), array('ID' => $post_id));
        clean_post_cache($post_id);

        update_post_meta($post_id, '_dk_author_routed', 1);
        update_post_meta($post_id, '_dk_author_duo', $duo_key);
        $alt[$duo_key] = $next;
        update_option('dk_author_alternation', $alt, false);
    }
}
if (!has_action('save_post', 'dk_auto_assign_author')) {
    add_action('save_post', 'dk_auto_assign_author', 20, 3);
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