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You're right. We'll fix the shortcut description as soon as possible. Thanks for reporting.
I can't reproduce the error with HSQLDB 2.3.2 either. Could you post the exact error message that you get / the screeshots with the error message?
What is the version of HSQLDB you are using? I cannot reproduce the problem, neither with constraint name "id", nor "id_pk".

As for 2, you can define primary key as
Id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY
but Vertabelo is prepared to handle multi-column primary keys. This is why it generates primary key as constraint.
We've talked about it here in the team. For now, it's not on our roadmap. I will keep the thread open so that other users can upvote or comment about this feature.
You have to check the checkbox "Generate comments for database objects" in the SQL generation settings. See the screenshot. Make sure the focus is not on any tables to see the Model properties panel.



I'm sorry I forgot to write about it in my previous answer.
The "Quote all identifies" checkbox now works for TABLESPACE and SCHEMA.
The validation is now available in Vertabelo.
Table and column descriptions are now generated as comments for table/column
Data Dictionary management is now available in Vertabelo.