History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 691–708 on 166f6e9bf4f134de4e0de65a2d4453aa82c04cbcff14f3854bb7e8a7ee361182. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 691,708:crates/hub/src/tlog.rs.