db_version < 240 ) {
			// No changes
		}

		/** 2.5 Branch ********************************************************/

		// 2.5.x
		if ( $raw_db_version < 250 ) {
			// No changes
		}

		/** 2.6 Branch ********************************************************/

		// Smaller installs run the upgrades directly
		if ( ! bbp_is_large_install() ) {

			/**
			 * Upgrade user favorites and subscriptions
			 */
			if ( $raw_db_version < 261 ) {
				bbp_admin_upgrade_user_favorites();
				bbp_admin_upgrade_user_topic_subscriptions();
				bbp_admin_upgrade_user_forum_subscriptions();
			}

			/**
			 * Upgrade user engagements
			 */
			if ( $raw_db_version < 262 ) {
				bbp_admin_upgrade_user_engagements();
			}

			/**
			 * Repair forum hidden reply count
			 */
			if ( $raw_db_version < 263 ) {
				bbp_admin_repair_forum_hidden_reply_count();
			}

		// Large installs require manual intervention
		} else {

			/**
			 * Upgrade user favorites and subscriptions
			 */
			if ( $raw_db_version < 261 ) {
				bbp_add_pending_upgrade( 'bbp-user-favorites-move' );
				bbp_add_pending_upgrade( 'bbp-user-topic-subscriptions-move' );
				bbp_add_pending_upgrade( 'bbp-user-forum-subscriptions-move' );

				// Set strategy to pre-2.6 on large network
				update_option( '_bbp_engagements_strategy', 'user' );
			}

			/**
			 * Upgrade user engagements
			 */
			if ( $raw_db_version < 262 ) {
				bbp_add_pending_upgrade( 'bbp-user-topic-engagements-move' );

				// Set strategy to pre-2.6 on large network
				update_option( '_bbp_engagements_strategy', 'user' );
			}

			/**
			 * Upgrade user engagements
			 */
			if ( $raw_db_version < 263 ) {
				bbp_add_pending_upgrade( 'bbp-forum-hidden-replies' );
			}
		}
	}

	/** All done! *************************************************************/

	// Bump the version
	bbp_version_bump();

	// Delete rewrite rules to force a flush
	bbp_delete_rewrite_rules();
}

/**
 * Redirect user to the "What's New" page on activation
 *
 * @since 2.2.0 bbPress (r4389)
 *
 * @internal Used internally to redirect bbPress to the about page on activation
 *
 * @return If network admin or bulk activation
 */
function bbp_add_activation_redirect() {

	// Bail if activating from network, or bulk
	if ( is_network_admin() || isset( $_GET['activate-multi'] ) ) {
		return;
	}

	// Add the redirect trigger
	update_user_option( get_current_user_id(), '_bbp_activation_redirect', true );
}

/**
 * Redirect user to "What's New" page on activation
 *
 * @since 2.2.0 bbPress (r4389)
 *
 * @internal Used internally to redirect bbPress to the about page on activation
 *
 * @return If no transient, or in network admin, or is bulk activation
 */
function bbp_do_activation_redirect() {

	// Bail if no redirect trigger
	if ( ! get_user_option( '_bbp_activation_redirect' ) ) {
		return;
	}

	// Delete the redirect trigger
	delete_user_option( get_current_user_id(), '_bbp_activation_redirect' );

	// Bail if activating from network, or bulk
	if ( is_network_admin() || isset( $_GET['activate-multi'] ) ) {
		return;
	}

	// Bail if the current user cannot see the about page
	if ( ! current_user_can( 'bbp_about_page' ) ) {
		return;
	}

	// Redirect to bbPress about page
	bbp_redirect( add_query_arg( array( 'page' => 'bbp-about' ), admin_url( 'index.php' ) ) );
}

/**
 * Hooked to the 'bbp_activate' action, this helper function automatically makes
 * the current user a Key Master in the forums if they just activated bbPress,
 * regardless of the bbp_allow_global_access() setting.
 *
 * @since 2.4.0 bbPress (r4910)
 *
 * @internal Used to internally make the current user a keymaster on activation
 *
 * @return If user can't activate plugins or is already a keymaster
 */
function bbp_make_current_user_keymaster() {

	// Catch all, to prevent premature user initialization
	if ( ! did_action( 'set_current_user' ) ) {
		return;
	}

	// Bail if not logged in or already a member of this site
	if ( ! is_user_logged_in() ) {
		return;
	}

	// Bail if the current user can't activate plugins since previous pageload
	if ( ! current_user_can( 'activate_plugins' ) ) {
		return;
	}

	// Cannot use bbp_get_current_user_id() during activation process
	$user_id = get_current_user_id();

	// Get the current blog ID, to know if they should be promoted here
	$blog_id = get_current_blog_id();

	// Bail if user is not actually a member of this site
	if ( ! is_user_member_of_blog( $user_id, $blog_id ) ) {
		return;
	}

	// Bail if the current user already has a forum role to prevent
	// unexpected role and capability escalation.
	if ( bbp_get_user_role( $user_id ) ) {
		return;
	}

	// Make the current user a keymaster
	bbp_set_user_role( $user_id, bbp_get_keymaster_role() );

	// Reload the current user so caps apply immediately
	wp_get_current_user();
}

/** Pending Upgrades **********************************************************/

/**
 * Return the number of pending upgrades
 *
 * @since 2.6.0 bbPress (r6895)
 *
 * @param string $type Type of pending upgrades (upgrade|repair|empty)
 *
 * @return int
 */
function bbp_get_pending_upgrade_count( $type = '' ) {
	return count( (array) bbp_get_pending_upgrades( $type ) );
}

/**
 * Return an array of pending upgrades
 *
 * @since 2.6.0 bbPress (r6895)
 *
 * @param string $type Type of pending upgrades (upgrade|repair|empty)
 *
 * @return array
 */
function bbp_get_pending_upgrades( $type = '' ) {

	// Get the pending upgrades
	$retval = (array) get_option( '_bbp_db_pending_upgrades', array() );

	// Looking for a specific type?
	if ( ! empty( $type ) ) {
		$tools   = bbp_get_admin_repair_tools( $type );
		$plucked = array_keys( wp_list_pluck( $tools, 'type' ) );
		$retval  = array_intersect( $retval, $plucked );
	}

	return (array) $retval;
}

/**
 * Add an upgrade ID to pending upgrades array
 *
 * @since 2.6.0 bbPress (r6895)
 *
 * @param string $upgrade_id
 */
function bbp_add_pending_upgrade( $upgrade_id = '' ) {

	// Get the pending upgrades option
	$pending = bbp_get_pending_upgrades();

	// Maybe add upgrade ID to end of pending array
	if ( false === array_search( $upgrade_id, $pending, true ) ) {
		array_push( $pending, $upgrade_id );
	}

	// Update and return
	return update_option( '_bbp_db_pending_upgrades', $pending );
}

/**
 * Add an upgrade ID to pending upgrades array
 *
 * @since 2.6.0 bbPress (r6895)
 *
 * @param string $upgrade_id
 */
function bbp_remove_pending_upgrade( $upgrade_id = '' ) {

	// Get the pending upgrades option
	$pending = bbp_get_pending_upgrades();

	// Look for this upgrade ID
	$index = array_search( $upgrade_id, $pending, true );

	// Maybe remove upgrade ID from pending array
	if ( false !== $index ) {
		unset( $pending[ $index ] );
	}

	// Update and return
	return update_option( '_bbp_db_pending_upgrades', $pending );
}

/**
 * Delete all pending upgrades
 *
 * @since 2.6.0 bbPress (r6895)
 */
function bbp_clear_pending_upgrades() {
	return delete_option( '_bbp_db_pending_upgrades' );
}

/**
 * Maybe append an upgrade count to a string
 *
 * @since 2.6.0 bbPress (r6896)
 *
 * @param string $string Text to append count to
 * @param string $type   Type of pending upgrades (upgrade|repair|empty)
 *
 * @return string
 */
function bbp_maybe_append_pending_upgrade_count( $string = '', $type = '' ) {

	// Look for an upgrade count
	$count = bbp_get_pending_upgrade_count( $type );

	// Append the count to the string
	if ( ! empty( $count ) ) {
		$suffix = ' <span class="awaiting-mod count-' . absint( $count ) . '"><span class="pending-count">' . bbp_number_format( $count ) . '</span></span>';
		$string = "{$string}{$suffix}";
	}

	// Return the string, maybe with a count
	return $string;
}