Convert existing threads and categories to projects.

convert-existing.php

<?php

function akv3_convert_to_projects() {
	global $wpdb;
	// convert categories
	$wpdb->query("
		UPDATE wp_term_taxonomy
		SET taxonomy = 'projects',
		parent = 0
		WHERE term_id IN (13, 14, 15, 20, 22, 52, 53, 58, 59)
	");
	// convert threads
	$wpdb->query("
		UPDATE wp_term_taxonomy
		SET taxonomy = 'projects',
		parent = 0
		WHERE term_id IN (400, 417, 438, 455)
	");
	$wpdb->query("
		UPDATE wp_posts
		SET post_type = 'project'
		WHERE ID IN (15866, 15874, 15876, 15878)
	");
	$wpdb->query("
		UPDATE wp_postmeta
		SET meta_key = '_cf-tax-post-binding_projects'
		WHERE meta_key = '_cf-tax-post-binding_threads'
		AND post_id IN (15866, 15874, 15876, 15878)
	");
}