mudkicker wrote:But I cannot imagine how the database of this site should be built... It is a very important project and obviously serious.
I agree with what Unipus said.
As a friendly point; If it's as serious as it sounds, you should really consider this twice. 'Serious project' and 'cant imagine database structure' does not go hand in hand I'm afraid... :/
And on top of that there is security, sessions, and as Unipus mentioned, various aspects depending on creating/recreating code, hardware, connection aso.
If you still want to venture in to the project...
It's a big topic to discuss so far at the beginning. To far to actually (for me) make any comment or suggestions. There are a couple of prebuildt ones (on sites like
http://www.hotscripts.com) but if they are bug free, secure, works at all etc. is another topic...