增加了账号管理的分组功能

web/backend/database.py

@@ -29,9 +29,22 @@ def get_db():
 def init_db():
     """建表 + 写入初始数据。"""
     Base.metadata.create_all(bind=engine)
+    _migrate()
     _seed()
 
 
+def _migrate():
+    """数据库迁移：为已有表添加新列。"""
+    from sqlalchemy import text
+    with engine.connect() as conn:
+        # 检查 accounts.tag 列是否存在
+        result = conn.execute(text("PRAGMA table_info(accounts)"))
+        columns = [row[1] for row in result]
+        if 'tag' not in columns:
+            conn.execute(text("ALTER TABLE accounts ADD COLUMN tag VARCHAR(64) DEFAULT ''"))
+            conn.commit()
+
+
 def _seed():
     """写入默认超管账号和角色。"""
     from .models import User