fixUserRegistration.php

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

class FixUserRegistration extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "Fix the user_registration field";
    }

    public function execute() {
        $dbr = wfGetDB( DB_SLAVE );
        $dbw = wfGetDB( DB_MASTER );

        // Get user IDs which need fixing
        $res = $dbr->select( 'user', 'user_id', 'user_registration IS NULL', __METHOD__ );
        foreach ( $res as $row ) {
            $id = $row->user_id;
            // Get first edit time
            $timestamp = $dbr->selectField( 'revision', 'MIN(rev_timestamp)', array( 'rev_user' => $id ), __METHOD__ );
            // Update
            if ( !empty( $timestamp ) ) {
                $dbw->update( 'user', array( 'user_registration' => $timestamp ), array( 'user_id' => $id ), __METHOD__ );
                $this->output( "$id $timestamp\n" );
            } else {
                $this->output( "$id NULL\n" );
            }
        }
        $this->output( "\n" );
    }
}

$maintClass = "FixUserRegistration";
require_once RUN_MAINTENANCE_IF_MAIN;