How do I add changes to the database

I downloaded Planet.osm and made tiles by using mapnik. But world changes and a new version of planet.osm is released weekly. There are also a dayly and a hourly diffs.

How do I add the changes (a diffs) to the PostGIS database (or update the database)?
How to update (redraw) tiles (just areas which has been changed)?

Thank you for any help.


Sorry that you didn’t get an answer. If you want to keep the data up to date and not import a new planet file very often then you need to set up your system to render from the minutely diffs.