When we will require MySQL 5.5.3 in Piwik, it would be desired to make our database use utf8mb4 collation. This would solve some possibly weird issues and in general, is a best practise for properly managing unicode characters in MySQL.

Background information utf8mb4

• https://mathiasbynens.be/notes/mysql-utf8mb4
• Wordpress ticket of utf8mb45 migration https://core.trac.wordpress.org/ticket/21212

Notes

• we wouldn't need to convert the database
• only use utf8mb4 if it's present (in case it could be disabled for some reasons)