Collect and display extra data (SQL info)

[glensc]

Seems xhprof has some kind of hack to record SQL queries as profiler records:

• https://github.com/longxinH/xhprof#turn-on-extra-collection

How should this be done instead? Consider that a typical application has most of the calls as userspace code, like Zend_Db_Statement_Pdo::_execute, and that usually XHPROF_FLAGS_NO_BUILTINS is wanted.

[glensc]

Probably answer to this is spans:

• https://support.tideways.com/documentation/reference/php-extension/custom-timespans.html