History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 748–765 on 6a306cd03fc12d18a52869bd400e9541b4c7392afdc914963dc81492f0c00fdd. 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 748,765:crates/hub/src/tlog.rs.