+- [ ] user-agent file as CLI option - need to run at least the crawler as another user
+- [ ] Support fetching rsync URIs
+- [ ] Check for peer duplicates:
+ - [ ] same nick for N>1 URIs
+ - [ ] same URI for N>1 nicks
+- [ ] Background polling and incremental timeline updates.
+ We can mark which messages have already been printed and print new ones as
+ they come in.
+ REQUIRES: polling