Couchbase Mobile 2.5 has been released, enhancing the NoSQL data platform for mobile applications with features aimed at improving data synchronization, machine learning integration, and logging capabilities. Building on the architecture of Couchbase Mobile 2.0, this version introduces a delta sync feature to reduce bandwidth by syncing only changed parts of a document, beneficial in bandwidth-constrained environments. Additionally, a new predictive Query API allows real-time machine learning predictions on the edge, leveraging mobile-optimized models for enhanced performance. Enhanced logging support includes continuous file-based, custom, and console logging, alongside fine-grained replication eventing, which allows applications to track the sync status of individual documents. Fine-grained filtered replication and the reintroduction of time-to-live support for document expiration further optimize data management. The Sync Gateway also sees improved monitoring capabilities with comprehensive statistics for better deployment insights. Overall, Couchbase Mobile 2.5 aims to provide more efficient, secure, and advanced functionalities for mobile data applications.