Default WordPress databases do utf8mb3 charset and collation

profile/manifests/mysql/db.pp

@@ -4,6 +4,8 @@ define profile::mysql::db (
   String $pass = 'password',
   String $host = $::fqdn,
   Array[String] $grant = ['ALL'],
+  String $charset = 'utf8',
+  String $collate = 'utf8_general_ci',
 ) {
 
   mysql::db { "${title}_${host}":
@@ -12,6 +14,8 @@ define profile::mysql::db (
     dbname   => $title,
     host     => $host,
     grant    => $grant,
+    charset  => $charset,
+    collate  => $collate,
   }
 
 }

profile/manifests/wordpress/instance.pp

@@ -3,6 +3,8 @@ define profile::wordpress::instance (
   String $db_pass,
   String $domain = $name,
   String $db_name = join(['wp_', regsubst($domain, /[^a-z0-9_]/, '_', 'G')]),
+  String $charset = 'utf8mb3',
+  String $collate = 'utf8mb3_general_ci',
 ) {
   if $domain !~ /[a-z0-9_.]+/ {
     fail("Invalid domain: ${domain}")
@@ -12,6 +14,8 @@ define profile::wordpress::instance (
     user    => $db_name,
     host    => 'localhost',
     pass    => $db_pass,
+    charset => $charset,
+    collate => $collate,
   }
 
   $php_socket = "/var/run/php-fpm/${db_name}"