CREATE TABLE IF NOT EXISTS site_settings (
    setting_key VARCHAR(255) PRIMARY KEY,
    setting_value TEXT
);

INSERT INTO site_settings (setting_key, setting_value) VALUES ('head_ads', '') ON DUPLICATE KEY UPDATE setting_key=setting_key;
INSERT INTO site_settings (setting_key, setting_value) VALUES ('body_ads', '') ON DUPLICATE KEY UPDATE setting_key=setting_key;