History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1455–1471 on 851a26a2a6d1b5ed058be51bf362a81b285687aa6e3f78e5ce948e5b188a4e9c. 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 1455,1471:crates/hub/src/flow.rs.