How to visualize the 'unique’ness of a certain table field in the diagram? I know that using the ''unique" keyword we can declare unique fields, but how to see that on the diagram?
Currently, we don’t display the unique indicator on the diagram.
I turned this post into a feature suggestion so other users can vote for this. We’ll consider displaying an indicator for the unique index in the future.
Thanks.
We need this feature.
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That would be a small but really nice feature! I don’t think it’s really hard to implement, so I hope the developers will include this feature despite fewer votes.
I agree that this would be a helpful addition. It’s something I stumbled upon immediately after using the product for a couple of hours.
I agree with the comments, please add this feature 
Hi everyone, thanks for bring this up! We’ve been working on this and are happy to share that we’re adding a unique constraint icon to the diagram.
We’re aiming to release it this week, next week at the latest. Stay tuned!