My PHP (mysqli) site is suddenly refusing to save changes to the database. Reads still work, but any record update—whether triggered from the WordPress admin area or through our custom JavaScript front-end—returns no change and sometimes throws a silent SQL error. The job is to trace and eliminate this update failure. I can grant access to the codebase,and phpMyAdmin. The stack is: • PHP 8.x using mysqli • MySQL 5.7 • WordPress (themes and a small helper plugin interact with the same tables) • Vanilla JavaScript on the client side