fix(小宝预警): 合并远端风险缓存

apps/web/lib/xiaobao-risk-cache.test.ts

@@ -3,6 +3,8 @@ import test from 'node:test';
 import type { XiaobaoRiskSnapshot } from './xiaobao-risk-trend';
 import {
   findCachedInsight,
+  mergeDailySnapshotCacheForSave,
+  mergeInsightCacheForSave,
   upsertDailySnapshot,
   upsertInsight,
   type XiaobaoRiskInsightCacheItem,
@@ -68,3 +70,34 @@ test('upsertInsight replaces existing version signature pair', () => {
 
   assert.deepEqual(result, [replacement, otherSignature, otherVersion]);
 });
+
+test('mergeDailySnapshotCacheForSave preserves remote rows and local-only rows', () => {
+  const remoteOnly: XiaobaoRiskSnapshot = {
+    versionId: 'remote-version',
+    date: '2026-06-29',
+    riskScore: 30,
+    riskLevel: 'attention',
+    openBugCount: 0,
+    failedTestCount: 0,
+    blockedCount: 0,
+    silentRiskCount: 0,
+    confidence: 90,
+    createdAt: '2026-06-29T08:00:00.000Z',
+  };
+  const localOnly: XiaobaoRiskSnapshot = { ...remoteOnly, versionId: 'local-version', riskScore: 50 };
+  const item: XiaobaoRiskSnapshot = { ...remoteOnly, versionId: 'current-version', riskScore: 70 };
+
+  const result = mergeDailySnapshotCacheForSave([localOnly], [remoteOnly], item);
+
+  assert.deepEqual(result, [item, remoteOnly, localOnly]);
+});
+
+test('mergeInsightCacheForSave preserves remote rows and local-only rows', () => {
+  const remoteOnly: XiaobaoRiskInsightCacheItem = { ...insightA, versionId: 'remote-version' };
+  const localOnly: XiaobaoRiskInsightCacheItem = { ...insightA, versionId: 'local-version' };
+  const item: XiaobaoRiskInsightCacheItem = { ...insightA, versionId: 'current-version' };
+
+  const result = mergeInsightCacheForSave([localOnly], [remoteOnly], item);
+
+  assert.deepEqual(result, [item, remoteOnly, localOnly]);
+});