The search_keyword column was removed for new installations in Ahoy
2.1.0 and stopped being used completely in Ahoy 3.0.0.
There are other columns that we use and are no longer generated by
default by Ahoy, which are: screen_height, screen_width and postal_code.
Apparently they're still used in Ahoy if they're available, though, so
we aren't removing them, at least for now.
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