Unique key in SQL Power Architect? Forward Engineering
I'm running Power Architect 1.0.6 on a Mac and the following instructions work for me.


Highlight the table you want to add the constraint to
Click on the "New Index" button on the toolbar and the "Index Properties" dialog appears, with sections for the name and type of constraint and a list of columns.
Enter a name for your constraint
Tick the "Unique" button
Tick the check box next to each column over which you want to define the constraint
Finally, click the "OK" button to add the constraint.


Hope this helps.