Improve the Ninja Tables admin experience by hooking into `ninja_table_raw_sql_placeholders` filter to add additional placeholders while in admin to allow queries to run in psuedo-mode.

ninja_table_raw_sql_placeholders.php

<?php
/**
 * hook into `ninja_table_raw_sql_placeholders` filter to add additional placeholders
 * while in admin to allow queries to run in psuedo-mode
 * @param	array	$filter
 */
add_filter('ninja_table_raw_sql_placeholders', function($filter){
	if( is_admin() ){
		/**
		 * these should already be set passing into this filter
		{current_user_id}
		{current_date}
		{current_date_time}
		{prefix}
		**/
		$filter['{current_post_id}'] = 1;
		$filter['{current_post_title}'] = 'Hello World!';
	}
	return $filter;
});