CREATE TABLE IF NOT EXISTS ai_usage_daily (
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    usage_date DATE NOT NULL DEFAULT CURRENT_DATE,
    requests INT NOT NULL DEFAULT 0,
    tokens BIGINT NOT NULL DEFAULT 0,
    PRIMARY KEY (user_id, usage_date)
);

CREATE TABLE IF NOT EXISTS ai_usage_monthly (
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    usage_month DATE NOT NULL,
    tokens BIGINT NOT NULL DEFAULT 0,
    PRIMARY KEY (user_id, usage_month)
);

CREATE INDEX IF NOT EXISTS ai_usage_daily_date_idx ON ai_usage_daily(usage_date);