History of checkpointer 2 changes

In crates/hub/src/tlog.rs, lines 597–614 on e97500b70f9ae63aa6df3fadb221f58aa092362b74dda26f09feb1677aab9d8a. 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.