History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 597–614 on 4f40eed0588f55ff8e73d82b0f9cdc24a5864cb105bd3cbb8bab35126c9580fb. 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 597,614:crates/hub/src/tlog.rs.