diff --git a/src/lib/monitor-worker.ts b/src/lib/monitor-worker.ts
index 3f02141..7d8d3b3 100644
--- a/src/lib/monitor-worker.ts
+++ b/src/lib/monitor-worker.ts
@@ -141,20 +141,21 @@ export class MonitorWorker {
 
     const results = await Promise.allSettled(
       channels.map(async (ch) => {
+        const raw = ch as unknown as Record<string, unknown>
         const channel: AlertChannelConfig = {
           id: ch.id as number,
           name: ch.name as string,
-          webhookUrl: (ch as Record<string, unknown>).webhook_url as string || '',
-          channelType: (ch as Record<string, unknown>).channel_type as string || 'wechat',
+          webhookUrl: (raw.webhook_url as string) || '',
+          channelType: (raw.channel_type as string) || 'wechat',
           enabled: !!ch.enabled_num,
           levelCritical: !!ch.level_critical_num,
           levelWarning: !!ch.level_warning_num,
           levelInfo: !!ch.level_info_num,
-          quietEnabled: !!(ch as Record<string, unknown>).quiet_enabled,
-          quietStart: (ch as Record<string, unknown>).quiet_start as string || '23:00',
-          quietEnd: (ch as Record<string, unknown>).quiet_end as string || '07:00',
-          quietBypassCritical: !!(ch as Record<string, unknown>).quiet_bypass_critical,
-          cooldownMinutes: Number((ch as Record<string, unknown>).cooldown_minutes) || 5,
+          quietEnabled: !!raw.quiet_enabled,
+          quietStart: (raw.quiet_start as string) || '23:00',
+          quietEnd: (raw.quiet_end as string) || '07:00',
+          quietBypassCritical: !!raw.quiet_bypass_critical,
+          cooldownMinutes: Number(raw.cooldown_minutes) || 5,
         }
         const decision = await this.alertManager.evaluate(channel, svc.id, level)
         if (decision.shouldPush) {