Live sizing on Westin: stair lifts ~254 customers / porch-VPL ~30 / lift chairs ~41, but lift serial coverage ~0 (12/416 stairlift lines). The serial-as-unit-key approach (valid for ADP wheelchairs) fails for lifts. Backfill now splits into two regimes: serial dedup for wheelchairs; partner+base-product+sale-line dedup for lifts with accessory-line exclusion via the per-product maintainable flag.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Build maintenance INTO fusion_repairs (engine ~90% already there): per-category policy (interval + flat fee, product override); fix the dead contract-spawn trigger for new sales + a one-time idempotent backfill of the existing install base (lifts + fusion_claims wheelchairs); technician-aware self-serve booking on fusion_tasks availability (NO Enterprise appointment) creating a technician task; structured maintenance visit log + inspection cert for lifts; office follow-up crons; cost shown to client. Out of v1: SMS, /my/equipment, route optimization.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
