Wow, great find, Barret!
Just to reassure you folks, the annotation system overhaul
– which we'll be developing once the current bugs and feature requests are cleared – will include full searching and category tagging functionality. So, for example, the timestamp you mentioned will be marked up with the :memory category, while the timestamp immediately before it will likely be in the :"procedural generation" category. Current categories from the streams I've annotated in the new markup can be found in this file