-- Only customer defaults change; existing order/facture lines are untouched.
-- 49.00 was the legacy default, not a stored indication of a negotiated price.
ALTER TABLE customers ADD COLUMN IF NOT EXISTS invoice_fee_exempt BOOLEAN NOT NULL DEFAULT FALSE;
ALTER TABLE customers ALTER COLUMN invoice_fee_amount DROP NOT NULL;
ALTER TABLE customers ALTER COLUMN invoice_fee_amount DROP DEFAULT;
-- One-time conversion, guarded against reruns by the setting row.
DO $$ BEGIN
 IF NOT EXISTS (SELECT 1 FROM settings WHERE key = 'invoice_fee_product_id') THEN
  UPDATE customers SET invoice_fee_exempt = TRUE WHERE invoice_fee_amount = 0;
  UPDATE customers SET invoice_fee_amount = NULL WHERE invoice_fee_amount = 49.00;
 END IF;
END $$;
INSERT INTO settings (key, value, category, description, value_type, is_public)
VALUES ('invoice_fee_product_id', '', 'system', 'Standardvare til faktureringsgebyr', 'string', TRUE)
ON CONFLICT (key) DO NOTHING;
ALTER TABLE tmodule_order_lines ADD COLUMN IF NOT EXISTS source_type TEXT;
ALTER TABLE tmodule_order_lines ADD COLUMN IF NOT EXISTS product_id INTEGER REFERENCES products(id);