History of heartbeat 1 change

In crates/hub/src/flow.rs, lines 1492–1496 on 351cf57e5608e7486d534fae73a0bfe833c800684179121a555b643e9f55aae3. 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 1492,1496:crates/hub/src/flow.rs.