`dedup_people COPY.sqlite` prints the listed people and faces before
and after, what the first run merged and kept apart and why, and the
time of three runs. The second and third runs are the cost the job
adds to every sync. `--peer PEER_COPY.sqlite` then plays two sync
round trips. The peer merges with the previous release's code path and
no job, this side merges back through sync::merge_remote, and the named
people each side lists are compared after every step.
On the reference pair: the desktop merges Claudine, Jessie x2, Mathias
and Noemi (80 -> 75 named). The tablet also merges its empty second
Ian (80 -> 74). The first run takes 1.2 s on the desktop, which is
building faces_box; the merge builds it first in practice. Later runs
take 8-15 ms.
dtourolle
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