Add users remember_token index #11881
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ykzts
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If
remember_tokenis nil and deviseremember_meis executed, generate remember token and run SQL to check if it is unique.https://github.com/plataformatec/devise/blob/v4.7.1/lib/devise/models/rememberable.rb#L150
However, remember_token has no index, so the more users, the longer it takes to check. This problem happens when logging in for the first time and after logging out. Adding an index to remember_token prevents it from slowing down.