You're right. We'll add this validation.

You're right. We'll add this validation.

We've just started working on generating descriptions/comments in the SQL scripts. The plan is to release it before Christmas. I'll let you know when the feature is available.

The fix is already available. 

There is a history of model versions on the Model details screen. Go to Model details (type Ctrl+M if you're in the diagram). The Model versions is at the bottom of the screen.

You can restore an old version of the model or create a new model from an old version. These operations are available in the More... dropdown menu.

This is an interesting idea. We'll take a look at the possibilities of implementing this feature. Thanks for reporting!

You're right, the "Quote all identifiers" checkbox should work for TABLESPACE and SCHEMA name as well. We have added fixing this to our roadmap.

I meant that you can write your own program to generate the docs in the format of your choice.

It turns out this feature is already implemented, it just wasn't documented. To get the version with a specific tag go to:
/api/xml/MODEL_ID/TAG
/api/sql/MODEL_ID/TAG
I will update the documentation.