Invisible bug and questions messages filtered in python out outside of collections

We're currently paying the full overhead of loading and massaging messages that might be filtered out. We can push these checks down into queries.

Besides being inefficient, it can mess up batching. Bug messages are batched and filtered, which means after grabbing the first and last 40 messages in bugs, any of those messages that are spam don't get shown, but another, valuable message isn't shown in its place. We just lose that slot altogether.