History of topic::user 1 change

In crates/hub/src/events.rs, lines 37–39 on diffusion-pin-bookmark. 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 37,39:crates/hub/src/events.rs.