History of run 4 changes

In crates/hub/src/backups.rs, lines 1455–1494 on 787632570bf924647f982368186b693468134d3617cec41ca11ed19451205d46. 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 1455,1494:crates/hub/src/backups.rs.