update

database.js

@@ -171,6 +171,41 @@ function initDatabase() {
     )
   `);
 
+  // 聊天附件表（上传的图片/视频/文件）
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS chat_files (
+      id TEXT PRIMARY KEY,
+      uploader_id TEXT NOT NULL,
+      file_name TEXT NOT NULL,
+      stored_name TEXT NOT NULL,
+      file_size INTEGER DEFAULT 0,
+      file_mime TEXT DEFAULT '',
+      created_at TEXT DEFAULT (datetime('now', 'localtime'))
+    )
+  `);
+
+  // 迁移：消息表补充媒体类型列（兼容旧库）
+  const msgCols = db.prepare('PRAGMA table_info(messages)').all().map(c => c.name);
+  if (!msgCols.includes('msg_type')) {
+    db.exec("ALTER TABLE messages ADD COLUMN msg_type TEXT DEFAULT 'text'");
+  }
+  if (!msgCols.includes('file_id')) {
+    db.exec("ALTER TABLE messages ADD COLUMN file_id TEXT DEFAULT ''");
+  }
+
+  // 推送事件表（聊天消息/设备报修/维修完成等，客户端轮询拉取）
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS push_events (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      user_id TEXT NOT NULL,
+      kind TEXT NOT NULL,
+      title TEXT NOT NULL,
+      body TEXT DEFAULT '',
+      created_at TEXT DEFAULT (datetime('now', 'localtime'))
+    )
+  `);
+  db.exec('CREATE INDEX IF NOT EXISTS idx_push_events_user ON push_events (user_id, id)');
+
   // 插入示例数据
   const deviceCount = db.prepare('SELECT COUNT(*) as count FROM devices').get();
   if (deviceCount.count === 0) {