CREATE TABLE IF NOT EXISTS ai_operator_settings (
    id SERIAL PRIMARY KEY,
    settings_key VARCHAR(64) NOT NULL UNIQUE,
    config_json TEXT NOT NULL DEFAULT '{}',
    updated_at VARCHAR(64) NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_ai_operator_settings_key
ON ai_operator_settings(settings_key);

CREATE INDEX IF NOT EXISTS idx_ai_operator_settings_updated_at
ON ai_operator_settings(updated_at);