The mergeable flag was stored, returned by the API and rendered in the editor
while changing nothing. The reason was upstream: the builder only ever read the
primary service's templates, and within one service two segments with the same
name do not occur — so the dedupe it already had could never fire.
Templates now come from the primary service plus every selected item, and
same-named mergeable segments collapse to one. Rules, with their reasons:
- the longest of the same-named segments survives — prepping two areas is not
shorter than prepping the longer one alone
- a duration_source: "items" segment also appears once even when it is not
marked mergeable, because DurationCalculator has already summed every item
and repeating the segment counts that time twice
- the merged requirement count is the maximum, not the sum and not the first
one seen: two areas do not need two rooms, but if one of them needed two
operators, merging must not quietly demote that to one
Also pins that the plan is deterministic: two previews of the same input are
compared byte for byte. A plan that shifts between preview and booking means
the user confirmed something that was not what got booked.
Unrelated but found by running the suite on a Saturday: testPastStartsAreExcluded
searched "last week's Saturday", which is today when today is Saturday, so this
afternoon's slots were legitimately not in the past. It now searches two weeks
back, which is unambiguous on every weekday.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
