Add length limiters for namespace, group and item.
This fixes an issue where the index will fail creation on a utf8mb4_unicode_ci collation as the max length is 3,072 bytes and the current gives us 3,084 bytes ((255+255+255+6) * 4) from the four columns used in the index.
Add length limiters for namespace, group and item.
This fixes an issue where the index will fail creation on a utf8mb4_unicode_ci collation as the max length is 3,072 bytes and the current gives us 3,084 bytes ((255+255+255+6) * 4) from the four columns used in the index.