History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 748–765 on 8eae2f0e255c5d2e162865f8219a66b836ffcc2fee97998124ef36ea2ff7f8c5. 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.