{:up ["CREATE TABLE customer_groups (
  id SERIAL,
  customer_id INT,
  name VARCHAR(512),
  user_id INT,
  PRIMARY KEY(id),
  CONSTRAINT fk_customer FOREIGN KEY(customer_id) REFERENCES customers(id)
);"
      "CREATE TABLE customer_group_products (
  id SERIAL,
  customer_group_id INT,
  product_id INT,
  amount NUMERIC,
  PRIMARY KEY(id),
  CONSTRAINT fk_customer_groups FOREIGN KEY(customer_group_id) REFERENCES customer_groups(id),
  CONSTRAINT fk_product FOREIGN KEY(product_id) REFERENCES products(id)
);"]
 :down ["DROP TABLE customer_group_products;"
        "DROP TABLE customer_groups;"]}