-- [ ] Crawl all cache/objects/*, not given peers.
- BUT, in order to build A-mentioned-B graph, we need to know the nick
- associated with the URI whos object we're examining. How to do that?
+- [ ] Batch download jobs by domain:
+ - at most 1 worker per domain
+ - more than 1 domain per worker is OK
+- [ ] Remove mention link noise in read view.
+ in short view: just abbreviate @<nick uri> to @nick
+ in long view: abbreviate like above AND list the full versions after the text
+- [ ] Crawl only valid objects
+ REQUIRES: peers-valid ref file update
+- [ ] Reduce log noise
+- [ ] Parallelize crawling by file
+- [ ] Parallelize reading by file
+- [ ] Support date without time in timestamps
+- [ ] Associate cached object with nick.