-- AI Usage Log — Token tracking for cost analysis

CREATE TABLE IF NOT EXISTS ai_usage_log (
    id CHAR(36) PRIMARY KEY,
    input_tokens INT UNSIGNED NOT NULL DEFAULT 0,
    output_tokens INT UNSIGNED NOT NULL DEFAULT 0,
    total_tokens INT UNSIGNED NOT NULL DEFAULT 0,
    cost_usd DECIMAL(12, 8) NOT NULL DEFAULT 0,
    cost_jod DECIMAL(12, 8) NOT NULL DEFAULT 0,
    model VARCHAR(50) NOT NULL DEFAULT 'gemini-flash-lite',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_created (created_at),
    INDEX idx_model (model)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;