-- 0pt payment-order ownership, ADR-001.
-- Apply after 001_init.sql and before deploying tenant-scoped order routes.
-- Legacy orders remain NULL-owned and cannot be read or paid by a buyer API.
-- Do not backfill from client-supplied config or guessed order IDs.

ALTER TABLE orders ADD COLUMN IF NOT EXISTS tenant_id text;
ALTER TABLE orders ADD COLUMN IF NOT EXISTS buyer_subject text;

ALTER TABLE orders DROP CONSTRAINT IF EXISTS orders_ownership_pair_ck;
ALTER TABLE orders ADD CONSTRAINT orders_ownership_pair_ck
  CHECK ((tenant_id IS NULL AND buyer_subject IS NULL)
      OR (tenant_id IS NOT NULL AND length(tenant_id) > 0
          AND buyer_subject IS NOT NULL AND length(buyer_subject) > 0));

CREATE INDEX IF NOT EXISTS orders_tenant_created_idx
  ON orders (tenant_id, created_at DESC)
  WHERE tenant_id IS NOT NULL;