Added
- Database (M5): while switched on, shows (in a section under the settings) the 25 largest site tables (plus any smaller one worth optimizing) and the 20 largest autoloaded options with owner guesses. One table can be optimized per confirmed click only when it is at most 500 MB, has at least 20 MB and 20 % free inside (InnoDB shows a few MB free in almost every small table, which a rebuild does not return), and the database data directory has at least twice its size free. Larger tables get a maintenance-window explanation. Autoload can be stopped per option, never for protected WordPress options, and each change can be undone from the log. Nothing is deleted or changed automatically; the limits keep rebuilds away from large production tables and protect available disk space.
tests/database-test.php(wp eval-file).