Featured Images: Edit & Undo does one focused job: change a small group of featured-image assignments and retain the original assignments for recovery.
Single-site WordPress with PHP 8.1+, the standard WordPress database driver and InnoDB tables is required. Batches are limited to 50 items from one selection page. SQLite, multisite, custom post types and custom database-routing layers are unsupported.
Keep the plugin active while you need undo. Reactivation makes old records export-only. Deletion removes all plugin history but leaves posts, media and image assignments intact. Direct database edits bypassing WordPress hooks cannot always be detected. Third-party external side effects cannot be rolled back. Read README.md for full recovery and compatibility guidance.