History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1455–1471 on 806615f974c0ff0cc209e8a964fead304496332b89ff38e2f1de4a1b11481e9c. 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.