Support recursively marking a folder as read.
Support recursively marking a folder as read.

This is not optimized right now so does lots of DB calls to accomplish this. Eventually we'll just cache the folder>{folder,feed} mapping in memory (and update every so often) and this can become one DB call.

jrupac/goliath,jrupac/goliath,jrupac/goliath,jrupac/goliath,jrupac/goliath