Ruby on Rails

I'm looking to add an edited_at field on comments etc in a Rails 5 app
(only shown if it has been edited).
I know I can compare created_at and updated_at to check if the comment
has been edited but it seems like a hit on the db if there are a lot of
comments.

Should I add an edited at boolean to the table and update it after edit?
Or am I as well to just compare created_at and updated_at?

Or is there some mechanism I can use that makes more sense than either
of these?

Johnny

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