History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1434–1450 on 1000b40a2629d21e3160b89695eff7c7af8b8449ca21a24d49fd5024e92bbd96. 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.