create carts table (#227)

migrations/000.344.sql

@@ -0,0 +1,9 @@
+-- Create carts table
+
+CREATE TABLE carts (
+	uuid UUID PRIMARY KEY,
+	inserted TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now(),
+	order_id INTEGER REFERENCES orders(id),
+	klarna_order_id TEXT,
+	content JSONB NOT NULL
+);