CREATE TABLE IF NOT EXISTS orders (
    order_id INTEGER PRIMARY KEY NOT NULL CHECK (typeof(order_id) = 'integer' AND order_id > 0),
    order_date TEXT NOT NULL CHECK (
        length(order_date) = 10 AND order_date >= '0001-01-01'
        AND order_date IS date(order_date, '+0 days')
    ),
    category TEXT NOT NULL CHECK (typeof(category) = 'text' AND length(trim(category)) > 0),
    quantity INTEGER NOT NULL CHECK (typeof(quantity) = 'integer' AND quantity > 0),
    unit_price_kopecks INTEGER NOT NULL CHECK (typeof(unit_price_kopecks) = 'integer' AND unit_price_kopecks > 0),
    revenue_kopecks INTEGER NOT NULL CHECK (
        typeof(revenue_kopecks) = 'integer' AND revenue_kopecks > 0
        AND revenue_kopecks = quantity * unit_price_kopecks
    )
) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS daily_category_revenue (
    order_date TEXT NOT NULL CHECK (
        length(order_date) = 10 AND order_date >= '0001-01-01'
        AND order_date IS date(order_date, '+0 days')
    ),
    category TEXT NOT NULL CHECK (typeof(category) = 'text' AND length(trim(category)) > 0),
    order_count INTEGER NOT NULL CHECK (typeof(order_count) = 'integer' AND order_count > 0),
    revenue_kopecks INTEGER NOT NULL CHECK (typeof(revenue_kopecks) = 'integer' AND revenue_kopecks > 0),
    PRIMARY KEY (order_date, category)
) WITHOUT ROWID;