History of scheduler 3 changes

In crates/hub/src/backups.rs, lines 1773–1791 on v0.6.1. 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 1773,1791:crates/hub/src/backups.rs.