diff --git a/database.py b/database.py
index 08b61d1..e36e4f6 100644
--- a/database.py
+++ b/database.py
@@ -15,9 +15,32 @@ class Database:
         self._init_db()
     
     def _init_db(self):
-        """初始化数据库"""
+        """初始化数据库（支持迁移）"""
         conn = sqlite3.connect(self.db_path)
-        conn.executescript(DB_SCHEMA)
+        
+        # 检查表是否存在
+        cursor = conn.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='images'")
+        table_exists = cursor.fetchone() is not None
+        
+        if not table_exists:
+            # 新建数据库
+            conn.executescript(DB_SCHEMA)
+        else:
+            # 迁移：检查是否有 date_folder 字段
+            cursor = conn.execute("PRAGMA table_info(images)")
+            columns = [row[1] for row in cursor.fetchall()]
+            
+            if 'date_folder' not in columns:
+                conn.execute("ALTER TABLE images ADD COLUMN date_folder TEXT")
+            
+            if 'camera_id' not in columns:
+                conn.execute("ALTER TABLE images ADD COLUMN camera_id INTEGER DEFAULT 0")
+            
+            # 检查 config 表
+            cursor = conn.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='config'")
+            if cursor.fetchone() is None:
+                conn.execute("CREATE TABLE IF NOT EXISTS config (key TEXT PRIMARY KEY, value TEXT)")
+        
         conn.commit()
         conn.close()