WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
ALTER TABLE wp_data_sync_transactions ADD COLUMN -- data LONGTEXT

Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/wp-includes/class-wpdb.php:1857) in /var/www/html/wp-includes/pluggable.php on line 1531 Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/wp-includes/class-wpdb.php:1857) in /var/www/html/wp-includes/pluggable.php on line 1534