Erlaube mehrere OTC-Zahlungsarten

db/migrations/0015_sales_order_payments.sql

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+CREATE TABLE sales_order_payment (
+  id BIGSERIAL PRIMARY KEY,
+  sales_order_id BIGINT NOT NULL REFERENCES sales_order(id) ON DELETE CASCADE,
+  payment_method_id BIGINT NOT NULL REFERENCES payment_method(id) ON DELETE RESTRICT,
+  amount NUMERIC(14, 2) NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  CONSTRAINT chk_sales_order_payment_amount_positive CHECK (amount > 0)
+);
+
+CREATE INDEX idx_sales_order_payment_order ON sales_order_payment(sales_order_id);
+CREATE INDEX idx_sales_order_payment_method ON sales_order_payment(payment_method_id);