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diff --git a/www/wiki/includes/libs/rdbms/exception/DBError.php b/www/wiki/includes/libs/rdbms/exception/DBError.php
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+++ b/www/wiki/includes/libs/rdbms/exception/DBError.php
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+<?php
+/**
+ * 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 RuntimeException;
+
+/**
+ * Database error base class
+ * @ingroup Database
+ */
+class DBError extends RuntimeException {
+	/** @var IDatabase|null */
+	public $db;
+
+	/**
+	 * Construct a database error
+	 * @param IDatabase $db Object which threw the error
+	 * @param string $error A simple error message to be used for debugging
+	 * @param \Exception|\Throwable|null $prev Previous exception
+	 */
+	public function __construct( IDatabase $db = null, $error, $prev = null ) {
+		parent::__construct( $error, 0, $prev );
+		$this->db = $db;
+	}
+}
+
+class_alias( DBError::class, 'DBError' );