This blog post guides developers through the process of debugging and tracing containerized Node Express and Python Flask applications using Lumigo. It begins by dissecting the inner workings of the demo applications, focusing on the /records route that throws a 500 error due to a database table not existing. The authors then walk through steps to add a database table, run curl commands to test the application's behavior, and use Lumigo to analyze and resolve issues such as schema mismatches, connection errors, permission issues, syntax errors in SQL queries, resource limits, and more. Throughout the post, the authors emphasize the importance of debugging and tracing in maintaining the health and performance of MySQL applications, highlighting how tools like Lumigo can simplify the process by providing context-rich trace data without requiring code changes.