OrderLine + computed TotalInCents; both inbound mappers reconstruct a
one-line order from the flat DTO/row (derived data is re-derived, not
written); builder realises WithTotal as a single line. Outbound mappers,
DTO, OrderData, DbContext and WebApp untouched — the small-steps payoff.
yak: exercise-2-solution-on-branch-exercise-2-solution-hw7e
Domain objects in After-side tests are constructed only through the
builders, so the upcoming OrderLines evolution changes builder internals
instead of every test. Before keeps object initializers (legacy world).
yak: testdatabuilders-validordervalidclient-after-test-migration-91vl
mostalive