- Six tables: pax8_companies, pax8_products, pax8_subscriptions,
pax8_orders, pax8_order_items, pax8_company_match_review
- Header/line-item design (D-01) with hard FK order_items->orders CASCADE
- Monetary NUMERIC(12,2) + currency CHAR(3) DEFAULT 'USD' (D-04)
- raw_payload JSONB safety net on all five non-review tables (D-03)
- pax8_company_match_review modeled field-for-field on device_link_review
(migration 080), with soft-ref BIGINT[] candidates and hard FK to
pax8_companies + nullable FK to companies(id)
