deleteDefaultMessages.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class DeleteDefaultMessages extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "Deletes all pages in the MediaWiki namespace" .
                                " which were last edited by \"MediaWiki default\"";
    }

    public function execute() {
        global $wgUser;

        $this->output( "Checking existence of old default messages..." );
        $dbr = wfGetDB( DB_SLAVE );
        $res = $dbr->select( array( 'page', 'revision' ),
            array( 'page_namespace', 'page_title' ),
            array(
                'page_namespace' => NS_MEDIAWIKI,
                'page_latest=rev_id',
                'rev_user_text' => 'MediaWiki default',
            )
        );

        if ( $dbr->numRows( $res ) == 0 ) {
            # No more messages left
            $this->output( "done.\n" );
            return;
        }

        # Deletions will be made by $user temporarly added to the bot group
        # in order to hide it in RecentChanges.
        $user = User::newFromName( 'MediaWiki default' );
        if ( !$user ) {
            $this->error( "Invalid username", true );
        }
        $user->addGroup( 'bot' );
        $wgUser = $user;

        # Handle deletion
        $this->output( "\n...deleting old default messages (this may take a long time!)...", 'msg' );
        $dbw = wfGetDB( DB_MASTER );

        foreach ( $res as $row ) {
            wfWaitForSlaves();
            $dbw->ping();
            $title = Title::makeTitle( $row->page_namespace, $row->page_title );
            $page = WikiPage::factory( $title );
            $dbw->begin( __METHOD__ );
            $error = ''; // Passed by ref
            $page->doDeleteArticle( 'No longer required', false, 0, false, $error, $user );
            $dbw->commit( __METHOD__ );
        }

        $this->output( "done!\n", 'msg' );
    }
}

$maintClass = "DeleteDefaultMessages";
require_once RUN_MAINTENANCE_IF_MAIN;