Announcing foreign key constraints support

This post announces the general availability of foreign key constraint support for unsharded databases on PlanetScale. This feature allows users to leverage referential integrity without reworking existing data models or ORMs. The implementation involves upgrading the Vitess cluster and potentially the MySQL version. The post details the beta enrollment process and the implications for existing and new databases, including import capabilities. It also highlights that sharded database support is planned for the future.