The Cube Core v0.30 release brings a significant number of new features and improvements across various platforms, including support for dbt metrics with Cube, Databricks export bucket feature, Materialize databases, QuestDB databases, and many others. The Developer Playground has also seen quality-of-life improvements, while the Cube SQL API has been vastly improved since its launch in v0.29. Breaking changes include deprecating CUBEJS_EXTERNAL_DEFAULT and CUBEJS_SCHEDULED_REFRESH_DEFAULT environment variables. Notable fixes and additions include support for ARM64 Linux, MySQL compatibility with information_schema, and various performance enhancements. The release also includes new features for AWS Athena, BigQuery, Databricks, JDBC, Materialize, MS SQL, Postgres, QuestDB, Snowflake, and Server platforms. Additionally, improvements have been made to the Playground, Client libraries, and documentation.