History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 748–765 on c2efc0b4674d6e45982cf7daed27327220f1f6c2a1c1948d170b92347a4e666a. 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.