use different icons for PK and FK

[aisbergde]

Expected Behavior

it should be easier to distinguish between PK and FK, also on black and white

Current Behavior

PK and FK using the same icon, the difference is only the color. it is hard to distinguish.

Possible Solution

use different icons for PK and FK which are different also on black and white output

[npetzall]

Want to do it, but need help with what should be used.
Key with an FK or PK on it? Replace with FK/PK as text icon?

[aisbergde]

here is a good idea:
https://i.stack.imgur.com/zAWYk.png

it is a key icon for PK and a "FK" text icon for FK. Key icons are often used and easy to understand if used for PK.

Another idea is PK1, PK2,... it would be possible to put more information about composite PK. On the other hand I think you will order the columns in the list in the order of PK and then this information is not required in the icon.

I would also think about 2 separate columns for PK and FK because a column could be PK and FK at the same time.