How to confirm that a PHP API goal conversion was registered?

This is a question about the internal database structure of Piwik. After using the PHP API to register a goal conversion, how can I check in the Piwik database that it has been successfully recorded? Which table should I look in, or which SQL should I use? Is this documented anywhere? We are having some problems understanding the reports, and a lot of goal conversions are lacking.

Grateful for any help.


EDIT: OK, I found this document: Database schema: API Reference - Matomo Analytics (formerly Piwik Analytics) - Developer Docs - v3 Will have a closer look, but any tips would be helpful, too.

log_conversion is immediately populated at every conversion.