// The Powerful Idea: Change Data Capture (CDC) + Go

I sat back and brainstormed with my AI architecture assistant. If the application layer is off-limits, and the server environment is hostile, where is the most fundamental place data changes are recorded?

The database's diary: the MySQL Binlog (Binary Log).

Every time an INSERT, UPDATE, or DELETE happens, MySQL writes it to the binlog before doing anything else. If we could listen to that log, we would have real-time events without the Java application ever knowing we were there. This is known as Change Data Capture (CDC).

To bypass the hostile server environment, we chose Go (Golang).

Go compiles down to a single, standalone executable binary. It doesn't care if the server lacks Python or Node.js. It just runs. We could write a lightweight Go agent that masquerades as a MySQL replica, reads the binlog stream, translates the row changes into JSON payloads, and fires them off to AWS SQS.

Zero intrusion. Zero dependencies. Real-time sync. This was the elegant architecture we were looking for.