diff --git a/backend/src/sync/scheduler.ts b/backend/src/sync/scheduler.ts
index a2b83c5..8e4657e 100644
--- a/backend/src/sync/scheduler.ts
+++ b/backend/src/sync/scheduler.ts
@@ -1,6 +1,9 @@
+import { v4 as uuid } from 'uuid';
 import { Cron } from 'croner';
 import { syncGitea } from './sync-gitea';
 import { analyzeCommitsForOKR } from '../services/okr-ai-sync';
+import { db } from '../db/index';
+import { syncLogs } from '../db/schema';
 import { config } from '../config';
 
 let giteaJob: Cron | null = null;
@@ -12,6 +15,17 @@ async function runSyncAndAnalyze() {
     await analyzeCommitsForOKR().catch(e =>
       console.error('[SCHEDULER] AI OKR 分析失败:', e)
     );
+  } else {
+    const reason = !config.AI_ENABLED ? 'AI_ENABLED=false' : 'AI_API_KEY 为空';
+    console.warn(`[SCHEDULER] 跳过 AI 分析: ${reason}`);
+    await db.insert(syncLogs).values({
+      id: uuid(),
+      source: 'ai_okr',
+      status: 'error',
+      message: `AI 分析被跳过: ${reason} (AI_ENABLED=${config.AI_ENABLED}, AI_API_KEY length=${config.AI_API_KEY?.length || 0}, AI_MODEL=${config.AI_MODEL})`,
+      recordsProcessed: 0,
+      syncedAt: new Date(),
+    });
   }
 }
 
@@ -22,7 +36,17 @@ export function startScheduler(): void {
     await runSyncAndAnalyze();
   });
 
-  console.info('[SCHEDULER] Gitea 自动同步已启动（每天 02:00 + 19:00）');
+  console.info(`[SCHEDULER] Gitea 自动同步已启动（每天 02:00 + 19:00 UTC）, AI_ENABLED=${config.AI_ENABLED}, AI_API_KEY length=${config.AI_API_KEY?.length || 0}`);
+
+  // 启动时立刻写一条诊断日志（不阻塞）
+  db.insert(syncLogs).values({
+    id: uuid(),
+    source: 'ai_okr',
+    status: 'success',
+    message: `[BOOT] Scheduler started. AI_ENABLED=${config.AI_ENABLED}, AI_API_KEY length=${config.AI_API_KEY?.length || 0}, AI_MODEL=${config.AI_MODEL}, AI_BASE_URL=${config.AI_BASE_URL}`,
+    recordsProcessed: 0,
+    syncedAt: new Date(),
+  }).catch(e => console.error('[SCHEDULER] 启动诊断日志写入失败:', e));
 
   // 启动后 10 秒执行一次首次同步
   setTimeout(async () => {