Inquiry fee (#256)

migrations/000.366.sql

@@ -0,0 +1,12 @@
+ALTER TYPE order_row_sub_type ADD VALUE 'inquiry_fee';
+ALTER TYPE order_row_sub_type ADD VALUE 'pre_paid_inquiry_fee';
+
+ALTER TYPE order_row_type ADD VALUE 'payment';
+
+alter table inquiries add column pre_payment_order_row_id INT REFERENCES order_rows(id) DEFAULT NULL;
+alter table inquiries add column repaid_order_id INT REFERENCES orders(id) DEFAULT NULL;
+
+-- Add foreign key to original inquiry.
+-- ON DELETE SET NULL so we can delete an inquiry (gdpr or otherwise) without getting a foreign key violation
+ALTER TABLE inquiries ADD COLUMN duplicate_of INTEGER REFERENCES inquiries(inquiryid) ON DELETE SET NULL;
+