Other alternatives suffer from various defaults:
- Mojolicious::Plugin::ClientIP doesn't handle IPv6
- Mojolicious::Plugin::ClientIP::Pluggable exclude private addresses

Mariadb enforce a maximum size limits of 1000 bytes for indexes.

token field has been renamed in #c72f46b3

and allow user to select a service provider from multiple lists

This allows to override web templates only, without forcing to
duplicated mail templates, for instance.