CREATE TABLE product_reviews (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    order_item_id UUID NOT NULL REFERENCES order_items (id),
    order_id UUID NOT NULL REFERENCES orders (id),
    product_id UUID NOT NULL REFERENCES products (id),
    shop_id UUID NOT NULL REFERENCES shops (id),
    user_id UUID NOT NULL REFERENCES users (id),
    rating INT NOT NULL CHECK (rating BETWEEN 1 AND 5),
    content JSONB NOT NULL,
    images JSONB NOT NULL DEFAULT '[]',
    reply JSONB,
    reply_at TIMESTAMPTZ,
    status TEXT NOT NULL DEFAULT 'visible' CHECK (status IN ('visible', 'hidden')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- At most one review per order line, forever.
CREATE UNIQUE INDEX product_reviews_one_per_line ON product_reviews (order_item_id);
CREATE INDEX idx_product_reviews_product ON product_reviews (product_id) WHERE status = 'visible';
CREATE INDEX idx_product_reviews_shop ON product_reviews (shop_id);
CREATE INDEX idx_product_reviews_user ON product_reviews (user_id);