Set category notification state historically

[sam (Sam Saffron)]

None of this stuff should be needed anymore, be sure to read the following carefully.

Watching and tracking implementation for tags and categories

I just revised the implementation of “tracking” and “watching” of tags and categories: [image] Watching categories and tags has always been a rather limited feature. When you started watching a category you would only watch topics in that category from that time on. (with an edge case that allowed you to also watch recategorized old topics) This limitation was … hmm … limiting. Start watching Bug and you would not be notified on a large amount of current Bug discussion on historic topics. T…