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diff --git a/www/wiki/includes/libs/rdbms/lbfactory/LBFactorySingle.php b/www/wiki/includes/libs/rdbms/lbfactory/LBFactorySingle.php
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+++ b/www/wiki/includes/libs/rdbms/lbfactory/LBFactorySingle.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Simple generator of database connections that always returns the same object.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Database
+ */
+
+namespace Wikimedia\Rdbms;
+
+use InvalidArgumentException;
+use BadMethodCallException;
+
+/**
+ * An LBFactory class that always returns a single database object.
+ */
+class LBFactorySingle extends LBFactory {
+	/** @var LoadBalancerSingle */
+	private $lb;
+
+	/**
+	 * @param array $conf An associative array with one member:
+	 *  - connection: The IDatabase connection object
+	 */
+	public function __construct( array $conf ) {
+		parent::__construct( $conf );
+
+		if ( !isset( $conf['connection'] ) ) {
+			throw new InvalidArgumentException( "Missing 'connection' argument." );
+		}
+
+		$lb = new LoadBalancerSingle( array_merge( $this->baseLoadBalancerParams(), $conf ) );
+		$this->initLoadBalancer( $lb );
+		$this->lb = $lb;
+	}
+
+	/**
+	 * @param IDatabase $db Live connection handle
+	 * @param array $params Parameter map to LBFactorySingle::__constructs()
+	 * @return LBFactorySingle
+	 * @since 1.28
+	 */
+	public static function newFromConnection( IDatabase $db, array $params = [] ) {
+		return new static( [ 'connection' => $db ] + $params );
+	}
+
+	/**
+	 * @param bool|string $domain (unused)
+	 * @return LoadBalancerSingle
+	 */
+	public function newMainLB( $domain = false ) {
+		return $this->lb;
+	}
+
+	/**
+	 * @param bool|string $domain (unused)
+	 * @return LoadBalancerSingle
+	 */
+	public function getMainLB( $domain = false ) {
+		return $this->lb;
+	}
+
+	public function newExternalLB( $cluster ) {
+		throw new BadMethodCallException( "Method is not supported." );
+	}
+
+	public function getExternalLB( $cluster ) {
+		throw new BadMethodCallException( "Method is not supported." );
+	}
+
+	/**
+	 * @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
+	 */
+	public function getAllMainLBs() {
+		return [ 'DEFAULT' => $this->lb ];
+	}
+
+	/**
+	 * @return LoadBalancerSingle[] Map of (cluster name => LoadBalancer)
+	 */
+	public function getAllExternalLBs() {
+		return [];
+	}
+
+	/**
+	 * @param string|callable $callback
+	 * @param array $params
+	 */
+	public function forEachLB( $callback, array $params = [] ) {
+		if ( isset( $this->lb ) ) { // may not be set during _destruct()
+			call_user_func_array( $callback, array_merge( [ $this->lb ], $params ) );
+		}
+	}
+}