CREATE TABLE dsolovianov.users (
    id			INT GENERATED ALWAYS AS IDENTITY NOT NULL,
    name		VARCHAR(100) NOT NULL,
    age			INT,
    email		VARCHAR(100),
    country		VARCHAR(100),
    is_active	BOOLEAN,
    created_at	TIMESTAMPTZ NOT NULL
);

CREATE TABLE dsolovianov.products (
	id			INT GENERATED ALWAYS AS IDENTITY NOT NULL,
	name		VARCHAR(100) NOT NULL,
	category	VARCHAR(50),
	price		DECIMAL(10,2) NOT NULL,
	in_stock	BOOLEAN
	);

CREATE TABLE dsolovianov.orders (
    id			INT GENERATED ALWAYS AS IDENTITY NOT NULL,
    user_id		INT,
    order_date  TIMESTAMPTZ NOT NULL,
    status		VARCHAR(20)
);

CREATE TABLE dsolovianov.order_items (
    order_id           INT NOT NULL,
    product_id         INT NOT NULL,
    quantity           INT NOT NULL,
    price_at_purchase  DECIMAL(10,2) NOT NULL,
    CONSTRAINT order_items_pk PRIMARY KEY (order_id, product_id)
);