htraced has a bug with greater_than queries.
Leveldb exposes a sorted map interface. It supports seeking to a specific key, but not to a position "greater than" a specific key. The code right now for greater_than assumes that if after the leveldb seek, it sees an equivalent key, it only needs to do one step forward to get to the keys which it should be able to return. However, it there are multiple "equal" entries, greater_than may have to do multiple seeks.