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diff --git a/phpBB/phpbb/db/migration/migration_interface.php b/phpBB/phpbb/db/migration/migration_interface.php
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+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\db\migration;
+
+/**
+ * Base class interface for database migrations
+ */
+interface migration_interface
+{
+	/**
+	 * Defines other migrations to be applied first
+	 *
+	 * @return array An array of migration class names
+	 */
+	static public function depends_on();
+
+	/**
+	 * Allows you to check if the migration is effectively installed (entirely optional)
+	 *
+	 * This is checked when a migration is installed. If true is returned, the migration will be set as
+	 * installed without performing the database changes.
+	 * This function is intended to help moving to migrations from a previous database updater, where some
+	 * migrations may have been installed already even though they are not yet listed in the migrations table.
+	 *
+	 * @return bool True if this migration is installed, False if this migration is not installed (checked on install)
+	 */
+	public function effectively_installed();
+
+	/**
+	 * Updates the database schema by providing a set of change instructions
+	 *
+	 * @return array Array of schema changes (compatible with db_tools->perform_schema_changes())
+	 */
+	public function update_schema();
+
+	/**
+	 * Reverts the database schema by providing a set of change instructions
+	 *
+	 * @return array Array of schema changes (compatible with db_tools->perform_schema_changes())
+	 */
+	public function revert_schema();
+
+	/**
+	 * Updates data by returning a list of instructions to be executed
+	 *
+	 * @return array Array of data update instructions
+	 */
+	public function update_data();
+
+	/**
+	 * Reverts data by returning a list of instructions to be executed
+	 *
+	 * @return array Array of data instructions that will be performed on revert
+	 * 	NOTE: calls to tools (such as config.add) are automatically reverted when
+	 * 		possible, so you should not attempt to revert those, this is mostly for
+	 * 		otherwise unrevertable calls (custom functions for example)
+	 */
+	public function revert_data();
+}