Which method is recommended for correcting data by Guidewire?

Using Gosu scripts is the recommended method for correcting data in Guidewire applications. Gosu is a type-safe programming language that integrates seamlessly with the Guidewire platform, making it the preferred choice for developers. By utilizing Gosu scripts, developers can leverage the built-in functionalities and frameworks that Guidewire provides, ensuring that any data corrections are performed in a way that is consistent with the application's business logic.

Gosu allows for easy access to the application’s data model and can handle complex data manipulations within the context of transactions, security, and validation that Guidewire enforces. This means that when corrections are made through Gosu, they remain part of the application's integrity checks and workflows, reducing the risk of data anomalies.

In contrast, using SQL scripts to correct data could bypass the application's business rules and validation processes, leading to potential issues with data integrity or operational workflows. Similarly, employing the command line or data visualization tools might not engage directly with the application's logic and could introduce discrepancies in the data. Thus, utilizing Gosu scripts aligns with best practices within the Guidewire ecosystem for managing and correcting data.