History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 691–708 on 858eca0d03c490d07d01bfa9748d5cc5742c749d31ecbbf882ece33f2ae0fcc5. 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.