some possibilities (some may be mix/matchable; some may be mutually exclusive):
- any more indexing we can do? >_>
- delete many types of entries past a certain age (can lean on log "interestingness" score for this)
- archive all entries past a certain age - move them to some other storage mechanism
- utilize a dedicated search application (like Solr, but not Solr, because Solr sucks)
- we already have Redis... can that be leveraged?