fix: 修复爬虫问题

server/db.js

@@ -112,6 +112,21 @@ db.exec(`
     estimated_strike_count INTEGER NOT NULL DEFAULT 0,
     updated_at TEXT NOT NULL
   );
+
+  CREATE TABLE IF NOT EXISTS news_content (
+    id TEXT PRIMARY KEY,
+    content_hash TEXT NOT NULL UNIQUE,
+    title TEXT NOT NULL,
+    summary TEXT NOT NULL,
+    url TEXT NOT NULL DEFAULT '',
+    source TEXT NOT NULL DEFAULT '',
+    published_at TEXT NOT NULL,
+    category TEXT NOT NULL DEFAULT 'other',
+    severity TEXT NOT NULL DEFAULT 'medium',
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+  CREATE INDEX IF NOT EXISTS idx_news_content_hash ON news_content(content_hash);
+  CREATE INDEX IF NOT EXISTS idx_news_content_published ON news_content(published_at DESC);
 `)
 
 // 迁移：为已有 key_location 表添加 type、region、status、damage_level 列