// Success (Temporary): Database Connection Pool Tuning

Abandoning the high-risk transaction refactor, I dove back into the backend configuration looking for high-ROI fixes.

That's when I found it: a critical oversight in the application’s context configuration. The subcontractor had left the database connector in development mode, rather than configuring a proper connection pool for production.

This was a massive discovery. The daily business operations and the aggressive integration polling were fighting over a very limited number of database connections, causing severe bottlenecks, timeouts, and hidden errors.

I immediately updated the Java application configuration to use JDBC connection pooling, setting the max pool size to 50.

The impact was instant. Average EC2 CPU load dropped by over 50%.

Days passed without a single data inconsistency report. It seemed like the crisis was over, the system stabilized, and "岁月静好" (all was quiet on the western front).