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Adjust MySQL key lengths to 191 characters
- since default encoding is utf8mb4: ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci - the max index prefix length is 767 bytes - utf8mb4 max character length is 4 bytes, so 4*191 = 764 - per: https://stackoverflow.com/a/31474509
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