History of scheduler 3 changes

In crates/hub/src/backups.rs, lines 1755–1773 on 9c04c779f03283ab78d451bc81e324acdb2ff5c60f391768a6a187405490e6d8. 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 1755,1773:crates/hub/src/backups.rs.