The blog post introduces core changefeeds as a new feature in CockroachDB 19.1, designed to enhance event-driven applications by allowing SQL clients to monitor database tables for changes in real-time. Utilizing the CHANGEFEED FOR statement, it enables the database to stream records of all table writes to a client until the connection is closed, facilitating tasks like event-driven app development and data integration. The functionality is demonstrated through SQL commands that create a table, enable rangefeeds, and show the real-time tracking of data insertions and deletions. Core changefeeds offer the same ordering and correctness guarantees as their enterprise counterparts but are limited to delivering data over a SQL connection, unlike enterprise changefeeds that can distribute data via Kafka or cloud storage. The post encourages readers to explore this feature through the change data capture documentation and stay updated with Cockroach Labs' offerings through their newsletter and social media.