Installation: Verify if database already contains some Jahia datas

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It used to be possible to install Jahia on a database wich already contains some Jahia datas. All data seemed to be droped, so that the database was reinitialized in order to perform installation. Now, it's impossible to reuse a database, and there are some errors in console. So, we have to manualy drop the database and then create a new one. This could be interesting, because it's a way to protect datas of accidental erasure, but the problem is that because of the errors in console, there's no guarantee that database hasn't been modified.
So, it would be interesting that when we try to install Jahia on a database which already contains some datas, a message is displayed, and user is asked if he wants to overwrite datas or not. If yes, every data in database is droped, to let install perform normally.