public static function get_schema() {
		global $wpdb;
		$charset_collate = $wpdb->get_charset_collate();
		// Automator Recipe log
		$tbl_recipe_log = $wpdb->prefix . 'uap_recipe_log';
		//Automator trigger log
		$tbl_trigger_log = $wpdb->prefix . 'uap_trigger_log';
		//Automator trigger meta data log
		$tbl_trigger_log_meta = $wpdb->prefix . 'uap_trigger_log_meta';
		// Automator Action log
		$tbl_action_log = $wpdb->prefix . 'uap_action_log';
		//Automator action meta data log
		$tbl_action_log_meta = $wpdb->prefix . 'uap_action_log_meta';
		// Automator Closure Log
		$tbl_closure_log = $wpdb->prefix . 'uap_closure_log';
		//Automator closure meta data log
		$tbl_closure_log_meta = $wpdb->prefix . 'uap_closure_log_meta';
		return "CREATE TABLE {$tbl_recipe_log} (
`ID` bigint unsigned NOT NULL auto_increment,
`date_time` datetime DEFAULT CURRENT_TIMESTAMP,
`user_id` bigint unsigned NOT NULL,
`automator_recipe_id` bigint unsigned NOT NULL,
`completed` tinyint(1) NOT NULL,
`run_number` mediumint unsigned NOT NULL DEFAULT 1,
PRIMARY KEY  (`ID`),
KEY completed (`completed`),
KEY user_id (`user_id`),
KEY automator_recipe_id (`automator_recipe_id`)
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_trigger_log} (
`ID` bigint unsigned NOT NULL auto_increment,
`date_time` datetime DEFAULT CURRENT_TIMESTAMP,
`user_id` bigint unsigned NOT NULL,
`automator_trigger_id` bigint unsigned NOT NULL,
`automator_recipe_id` bigint unsigned NOT NULL,
`automator_recipe_log_id` bigint unsigned NULL,
`completed` tinyint(1) unsigned NOT NULL,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY completed (`completed`),
KEY automator_recipe_id (`automator_recipe_id`),
KEY automator_trigger_id (`automator_trigger_id`),
KEY automator_recipe_log_id (`automator_recipe_log_id`)
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_trigger_log_meta} (
`ID` bigint unsigned NOT NULL auto_increment,
`user_id` bigint unsigned NOT NULL,
`automator_trigger_log_id` bigint unsigned NULL,
`automator_trigger_id` bigint unsigned NOT NULL,
`meta_key` varchar(255) DEFAULT '' NOT NULL,
`meta_value` longtext NULL,
`run_number` mediumint unsigned NOT NULL DEFAULT 1,
`run_time` datetime DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY run_number (`run_number`),
KEY automator_trigger_id (`automator_trigger_id`),
KEY automator_trigger_log_id (`automator_trigger_log_id`),
KEY meta_key (meta_key(20))
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_action_log} (
`ID` bigint unsigned NOT NULL auto_increment,
`date_time` datetime DEFAULT CURRENT_TIMESTAMP,
`user_id` bigint unsigned NOT NULL,
`automator_action_id` bigint unsigned NOT NULL,
`automator_recipe_id` bigint unsigned NOT NULL,
`automator_recipe_log_id` bigint unsigned NULL,
`completed` tinyint(1) unsigned NOT NULL,
`error_message` longtext NULL,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY completed (`completed`),
KEY automator_action_id (`automator_action_id`),
KEY automator_recipe_log_id (`automator_recipe_log_id`),
KEY automator_recipe_id (`automator_recipe_id`)
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_action_log_meta} (
`ID` bigint unsigned NOT NULL auto_increment,
`user_id` bigint unsigned NOT NULL,
`automator_action_log_id` bigint unsigned NULL,
`automator_action_id` bigint unsigned NOT NULL,
`meta_key` varchar(255) DEFAULT '' NOT NULL,
`meta_value` longtext NULL,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY automator_action_log_id (`automator_action_log_id`),
KEY automator_action_id (`automator_action_id`),
KEY meta_key (meta_key(20))
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_closure_log} (
`ID` bigint unsigned NOT NULL auto_increment,
`date_time` datetime DEFAULT CURRENT_TIMESTAMP,
`user_id` bigint unsigned NOT NULL,
`automator_closure_id` bigint unsigned NOT NULL,
`automator_recipe_id` bigint unsigned NOT NULL,
`completed` tinyint(1) unsigned NOT NULL,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY automator_recipe_id (`automator_recipe_id`),
KEY automator_closure_id (`automator_closure_id`),
KEY completed (`completed`)
) ENGINE=InnoDB {$charset_collate};
CREATE TABLE {$tbl_closure_log_meta} (
`ID` bigint unsigned NOT NULL auto_increment,
`user_id` bigint unsigned NOT NULL,
`automator_closure_id` bigint unsigned NOT NULL,
`meta_key` varchar(255) DEFAULT '' NOT NULL,
`meta_value` longtext NULL,
PRIMARY KEY  (`ID`),
KEY user_id (`user_id`),
KEY automator_closure_id (`automator_closure_id`),
KEY meta_key (meta_key(15))
) ENGINE=InnoDB {$charset_collate};";
	}