Fills service_total_minutes/service_buffer_minutes on future service-mode
appointments booked before the columns existed.
The value comes from the appointment itself (slot_end - slot_start), not from
recomputing the services: an existing appointment may have been booked with a
manual duration and recomputing would rewrite the past. Slot-mode, past,
reserve and cancelled appointments are skipped.
Dry-run by default. Idempotency comes from the query filtering on
serviceTotalMinutes IS NULL rather than from a flag, so a second run has nothing
to do.
Task: docs/new_feture/taskes/task-00-service-mode-completion/
Slot-mode contract: unchanged (--group=slot-mode-frozen green)
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
