History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 748–765 on 041a945f55f82634df6a9c5f2c75e604185da16f01eb5369b4a2b25b047b8956. 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.