1、后端数据库model优化，解决mysql、sqlite初始化问题，同时满足

2、部门表移除创建人，负责会和user表有外键循环引用问题，这样设计合理
3、前端所有列表左对齐，移除部门详情中创建人字段

backend/app/api/v1/models/system/dept_model.py

@@ -22,52 +22,22 @@ class DeptModel(ModelBase):
     # 层级关系
     parent_id = Column(
         Integer, 
-        ForeignKey("system_dept.id", ondelete="SET NULL", onupdate="CASCADE"), 
+        ForeignKey("system_dept.id", ondelete="CASCADE", onupdate="CASCADE"), 
         nullable=True, 
         index=True, 
         comment="父级部门ID"
     )
     parent = relationship(
         "DeptModel", 
-        remote_side=[id], 
-        backref="children", 
-        lazy="selectin", 
+        cascade='all, delete-orphan', 
         uselist=False
     )
     
     # 状态字段
     available = Column(Boolean, default=True, nullable=False, comment="是否启用(True:启用 False:禁用)")
     
-    # 关联关系
-    users = relationship(
-        "UserModel",
-        back_populates="dept",
-        foreign_keys="UserModel.dept_id",
-        lazy="selectin"
-    )
-    
-    roles = relationship(
-        "RoleModel",
-        secondary="system_role_depts",
-        back_populates="depts",
-        lazy="selectin"
-    )
-    
     # 审计字段
     description = Column(Text, nullable=True, comment="备注说明")
     created_at = Column(DateTime, default=datetime.now, comment='创建时间')
     updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now, comment='更新时间')
-    creator_id = Column(
-        Integer, 
-        ForeignKey("system_user.id", ondelete="SET NULL", onupdate="CASCADE"), 
-        nullable=True, 
-        index=True, 
-        comment="创建人ID"
-    )
-    creator = relationship(
-        "UserModel", 
-        foreign_keys=[creator_id], 
-        lazy="joined",
-        post_update=True,
-        uselist=False
-    )
+

backend/app/api/v1/models/system/menu_model.py

@@ -47,10 +47,8 @@ class MenuModel(ModelBase):
     )
     parent = relationship(
         "MenuModel", 
-        remote_side=[id], 
-        backref="children", 
-        lazy="joined",
-        post_update=True,
+        cascade='all, delete-orphan',
+        primaryjoin="MenuModel.parent_id == MenuModel.id",
         uselist=False
     )
     

backend/app/api/v1/models/system/position_model.py

@@ -23,21 +23,6 @@ class PositionModel(ModelBase):
     # 状态字段
     available = Column(Boolean, default=True, nullable=False, comment="是否启用(True:启用 False:禁用)")
 
-    # 关联关系
-    dept_id = Column(
-        Integer, 
-        ForeignKey("system_dept.id", ondelete="SET NULL", onupdate="CASCADE"), 
-        nullable=True, 
-        index=True, 
-        comment="所属部门ID"
-    )
-    dept = relationship(
-        'DeptModel', 
-        primaryjoin="PositionModel.dept_id == DeptModel.id", 
-        lazy="joined",
-        post_update=True,
-        uselist=False
-    )
     users = relationship(
         "UserModel", 
         secondary=UserPositionsModel.__tablename__, 

backend/app/api/v1/models/system/role_model.py

@@ -83,6 +83,8 @@ class RoleModel(ModelBase):
         "MenuModel",
         secondary=RoleMenusModel.__tablename__,
         lazy="joined",
+        cascade="all, delete",
+        passive_deletes=True,
         post_update=True,
         uselist=True
     )
@@ -90,6 +92,8 @@ class RoleModel(ModelBase):
         "DeptModel",
         secondary=RoleDeptsModel.__tablename__,
         lazy="joined",
+        cascade="all, delete",
+        passive_deletes=True,
         post_update=True,
         uselist=True
     )

backend/app/api/v1/models/system/user_model.py

@@ -80,28 +80,24 @@ class UserModel(ModelBase):
     
     # 组织信息
     dept_id = Column(
-        Integer, 
-        ForeignKey('system_dept.id', ondelete="SET NULL", onupdate="CASCADE"), 
-        nullable=True, 
-        index=True, 
-        comment="所属部门ID"
+        Integer,
+        ForeignKey('system_dept.id', ondelete="SET NULL", onupdate="CASCADE"),
+        nullable=True, index=True, comment="部门ID"
     )
     dept = relationship(
-        "DeptModel",
-        back_populates="users",
-        foreign_keys=[dept_id],
-        lazy="joined",
-        post_update=True
-    )
+        'DeptModel', 
+        primaryjoin="UserModel.dept_id == DeptModel.id", 
+        lazy="select", 
+        uselist=False)
     roles = relationship(
         "RoleModel", 
         secondary=UserRolesModel.__tablename__, 
-        lazy="selectin", 
+        lazy="joined", 
         uselist=True)
     positions = relationship(
         "PositionModel", 
         secondary=UserPositionsModel.__tablename__, 
-        lazy="selectin", 
+        lazy="joined", 
         uselist=True)
     
     # 审计字段
@@ -119,5 +115,6 @@ class UserModel(ModelBase):
         "UserModel",
         remote_side=[id],
         foreign_keys=[creator_id],
-        lazy="selectin"
+        lazy="selectin",
+        uselist=False
     )