History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1434–1450 on d7e2c27548078f2ce2a76373feabfe92c097ba0cedb6d6ed76a0e1f4d204f57a. 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.