History of scheduler 3 changes

In crates/hub/src/backups.rs, lines 1764–1782 on c419455a82dd6399649a6bf25e2ea61ee2e3c9b7562b50c768f73b766a1e0c5d. 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 1764,1782:crates/hub/src/backups.rs.