public function get_engagements( $type, $period = 'current' ) {

		global $wpdb;

		$ids = implode( ',', $this->get_all_ids() );

		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		return $wpdb->get_var(
			$wpdb->prepare(
				"
			SELECT DISTINCT COUNT( user_id )
			FROM {$wpdb->prefix}lifterlms_user_postmeta
			WHERE meta_key = %s
			  AND post_id IN ( {$ids} )
			  AND updated_date BETWEEN %s AND %s
			",
				'_' . $type,
				$this->get_date( $period, 'start' ),
				$this->get_date( $period, 'end' )
			)
		);// db call ok; no-cache ok.
		// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared

	}