fb8da6f4af
Summary: Ref T1191. The major issue motivation here is that InnoDB keys have a maximum length of 767 bytes. When we move `utf8` colums to `utf8mb4` columns, they'll jump from 3 bytes per character to 4 bytes per character, which may make some indexes too long. Add key schema to help spot this. Also add nullability since it doesn't hurt. Test Plan: See screenshots. Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T1191 Differential Revision: https://secure.phabricator.com/D10499
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