History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1434–1450 on 5caa65fd51e70be4b6320a97bb81662d8607a96797ea4dd3cd7e5ba4732702e5. 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 1434,1450:crates/hub/src/flow.rs.