Ditto SDK 4.12 introduces significant enhancements, including DQL projections, aggregates, and indexes to optimize query performance, while expanding Flutter support to Linux and macOS. The update marks a shift from the legacy Query Builder to a more robust DQL interface, allowing developers to write efficient and flexible queries. In practical application, the use of projections reduced data payloads significantly, improving app performance, while simple indexes facilitated faster search functionalities. The new monitoring API provides tools for real-time sync status tracking across platforms, and aggregate functions enable advanced query features like pagination. As Ditto transitions to DQL, a migration guide is available to assist developers in updating their applications. The update represents a pivotal move towards more powerful and maintainable query capabilities, with future enhancements anticipated.