History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1440–1456 on 58ac360b334575a55b2149a5dd40b59592da2eee8b6196a3afee51a5c08fdb50. 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 1440,1456:crates/hub/src/flow.rs.