What does the thunderbolt icon mean in the related tables list indicate?

Sometimes it's black outline, sometimes black fill. What does it indicate? Thanks!
Screenshot 2023-08-04 at 17.59.01

Aha. Whereas self hosted, or at least the version I'm running, has no tooltip for this, the new cloud IDE does. For anyone else who wonders:
Lightening bolt outline: This column has an index. Queries that use this column may be faster than they otherwise would be.
Lightening bolt filled: This column has a unique index. Queries that use this column may be faster than they otherwise would be.

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Hey there! These tooltips should be available for self-hosted as well as of 3.6 :slightly_smiling_face: