>
> what would you say. how long is the development time for a warehouse
> database that provides the entire intelligence. (approximately) All tables

Hello Olaf

Look at the following link: http://synerpy.de/cm/index.php/averp.html

This is a open source ERP system, as far a I know Firebird based.
Even a Logistic Module is included.

They claim a value of 5.000.000 Euro.

Good luck
Christian