Full uninstall with clean DB?

Hello,

User Meta itself does not clean some of its data, in case you re-install the plugin again, you may not want to start from the scratch. Also, it is helpful for version updates. However, if you really want to get rid of these data, you can choose some other ways.

Any plugin like Advanced Database Cleaner can be the solution. For the note, all User Meta settings and options are stored in WordPress ‘option’ table and the prefix of these options is ‘user_meta’.

In another way, running the code below will erase this plugin’s data.

$all_options = wp_load_alloptions();
 
foreach ( $all_options as $name => $value ) {
    if ( substr( $name, 0, strlen('user_meta') ) === 'user_meta' ) {
        delete_option( $name );
    }
}

And the feature of DB cleaning on uninstallation will be considered in the future updates.