-- 通知日志表
CREATE TABLE IF NOT EXISTS ai_ops_notification_logs (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    event_id UUID NOT NULL REFERENCES ai_ops_alerts(id) ON DELETE CASCADE,
    channel_id UUID NOT NULL REFERENCES ai_ops_channels(id) ON DELETE CASCADE,
    channel_type VARCHAR(32) NOT NULL,
    status VARCHAR(16) NOT NULL DEFAULT 'pending'
        CHECK (status IN ('pending', 'sent', 'failed', 'retrying')),
    retry_count INT NOT NULL DEFAULT 0,
    error_message TEXT NULL,
    sent_at TIMESTAMPTZ NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_notification_logs_event ON ai_ops_notification_logs(event_id);
CREATE INDEX IF NOT EXISTS idx_notification_logs_status ON ai_ops_notification_logs(status);
CREATE INDEX IF NOT EXISTS idx_notification_logs_created ON ai_ops_notification_logs(created_at DESC);