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How does caching work in qpixel?  Where are the entry points?

Caching is really important for scaling.  I know we cache some data -- something about tags (tags for a post?) has been discussed on meta, and I know the "new posts" silver dot (badge) is cached so we don't check it on every page-load.

How and where is caching implemented?  If I want to add a new indicator that I think will probably need to be cached, like an indicator for pending suggested edits, how should I approach that in a performant way?