初始化提交，包含完整的邮件系统代码

app/models/__init__.py

@@ -0,0 +1,46 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, scoped_session
+import os
+import sys
+
+# 修改相对导入为绝对导入
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))
+from config import active_config
+
+# 创建数据库引擎
+engine = create_engine(active_config.SQLALCHEMY_DATABASE_URI)
+
+# 创建会话工厂
+session_factory = sessionmaker(bind=engine)
+Session = scoped_session(session_factory)
+
+# 创建模型基类
+Base = declarative_base()
+
+# 获取数据库会话
+def get_session():
+    """获取数据库会话"""
+    return Session()
+
+# 初始化数据库
+def init_db():
+    """初始化数据库，创建所有表"""
+    # 导入所有模型以确保它们被注册
+    from .domain import Domain
+    from .mailbox import Mailbox
+    from .email import Email
+    from .attachment import Attachment
+    
+    # 创建表
+    Base.metadata.create_all(engine)
+    
+    return get_session()
+
+# 导出模型类
+from .domain import Domain
+from .mailbox import Mailbox
+from .email import Email
+from .attachment import Attachment
+
+__all__ = ['Base', 'get_session', 'init_db', 'Domain', 'Mailbox', 'Email', 'Attachment']