That branch numbered its own steps after the upstream step it was cut
from, so a database at schema_version 243 to 246 (or 216 to 218) with the
Tours tables had four upstream migrations marked as run without ever
running them. The baseline now cuts such a version back to the last
upstream step, and the Tours migration adds the difficulty cap to a tours
table an earlier branch stage created without it.
Maurice
bfa512589c