I would like to ask you guys if you could review my database design. I think it is quite self-explanatory, but to be absolutely clear:
My goal is to make an application which has a super flexible user management (which is why the groups are in tree-form and the groups and users have a habtm relationship) and a super modular way to build pages (which is why the pages consist of widget-blocks).
The reason I made users and profiles separate is because the users table will not change and is only needed for authentication and authorization. However, the profiles table will change according to the wishes of the client. So it might not have a signature, but an avatar field instead. Or maybe it will be completely empty / not exist at all.
A widget could be anything, it could be a poll, it could be a piece of content, it could be a navigation, it could be a collection of comments, whatever.
The reason I chose to make subdomains, locales and layouts separate tables instead of just putting the names into pages is because I want to limit the options that are available to the client. Just because I have a three-columns.ctp in my layouts folder doesn't necessarily mean I want the client to be able to choose it.
Same goes for the widgets. And besides limiting choice, not every plugin, controller and action in my plugins-folder is a widget, so I need a table to clarify which are.
A block is a widget on a page which sits in a container (e.g. the right column in a 3 column layout) at a particular position which is decided by the index (lower index means higher).
So that's my explanation, what do you guys think? Is this as good as it can be? Or do you have (a) suggestion(s) to make it even more flexible and modular.
[edit] Oh and to be clear, the widgets will of course have their own tables to store the information they need to store.