History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1430–1446 on 8501fd5815b9e83cd465032461acf282f4538f115450cef2e0272e12284fd83b. 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 1430,1446:crates/hub/src/flow.rs.