diff --git a/packages/adapters/sqlalchemy_impl/workspace_member_repository.py b/packages/adapters/sqlalchemy_impl/workspace_member_repository.py
index ef0f3551b..c96c42f86 100644
--- a/packages/adapters/sqlalchemy_impl/workspace_member_repository.py
+++ b/packages/adapters/sqlalchemy_impl/workspace_member_repository.py
@@ -1,102 +1,24 @@
 from __future__ import annotations
-
-from typing import List, Optional, TYPE_CHECKING
-
-from sqlalchemy.orm import Session, joinedload
-
-from packages.adapters.sqlalchemy_impl.models import WorkspaceMemberModel
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from sqlalchemy.orm import Session
 from packages.domain.entities import WorkspaceMember
 from packages.ports.workspace_member_repository import WorkspaceMemberRepository
 
-if TYPE_CHECKING:
-    from packages.adapters.sqlalchemy_impl.models import UserModel
-
-
 class SQLAlchemyWorkspaceMemberRepository(WorkspaceMemberRepository):
     def __init__(self, session: Session):
         self.session = session
-
     def save(self, member: WorkspaceMember) -> None:
-        model = self.session.get(WorkspaceMemberModel, member.id)
-        if model is None:
-            model = (
-                self.session.query(WorkspaceMemberModel)
-                .filter(
-                    WorkspaceMemberModel.workspace_id == member.workspace_id,
-                    WorkspaceMemberModel.user_id == member.user_id,
-                )
-                .first()
-            )
-        if model is None:
-            model = WorkspaceMemberModel(id=member.id)
-            self.session.add(model)
-
-        model.workspace_id = member.workspace_id
-        model.user_id = member.user_id
-        model.role = str(member.role)
-        model.invited_by = member.invited_by
-        model.joined_at = member.joined_at
-
-        self.session.commit()
-        self.session.refresh(model)
-
-    def find_by_id(self, member_id: str) -> WorkspaceMember | None:
-        return self._to_entity(self.session.get(WorkspaceMemberModel, member_id))
-
-    def find_by_workspace_and_user(self, workspace_id: str, user_id: str) -> WorkspaceMember | None:
-        model = (
-            self.session.query(WorkspaceMemberModel)
-            .filter(WorkspaceMemberModel.workspace_id == workspace_id, WorkspaceMemberModel.user_id == user_id)
-            .first()
-        )
-        return self._to_entity(model)
-
-    def find_by_user(self, user_id: str) -> list[WorkspaceMember]:
-        models = (
-            self.session.query(WorkspaceMemberModel)
-            .filter(WorkspaceMemberModel.user_id == user_id)
-            .order_by(WorkspaceMemberModel.joined_at.desc())
-            .all()
-        )
-        return [self._to_entity(model) for model in models if model is not None]
-
-    def find_by_workspace(self, workspace_id: str) -> list[WorkspaceMember]:
-        """查找 workspace 的所有成员，使用 JOIN 预加载用户数据避免 N+1 查询问题。
-        
-        P2-3 Fix: 使用 joinedload 预加载关联的用户数据，
-        这样在访问 member.user 时不会触发额外的数据库查询。
-        """
-        models = (
-            self.session.query(WorkspaceMemberModel)
-            .filter(WorkspaceMemberModel.workspace_id == workspace_id)
-            .options(joinedload(WorkspaceMemberModel.user))  # P2-3: JOIN 预加载用户数据
-            .order_by(WorkspaceMemberModel.joined_at.asc())
-            .all()
-        )
-        return [self._to_entity(model) for model in models if model is not None]
-
+        raise NotImplementedError("Workspace feature removed")
+    def find_by_id(self, member_id: str):
+        return None
+    def find_by_workspace_and_user(self, workspace_id: str, user_id: str):
+        return None
+    def find_by_user(self, user_id: str):
+        return []
+    def find_by_workspace(self, workspace_id: str):
+        return []
     def count_by_workspace(self, workspace_id: str) -> int:
-        return (
-            self.session.query(WorkspaceMemberModel).filter(WorkspaceMemberModel.workspace_id == workspace_id).count()
-        )
-
+        return 0
     def delete(self, member_id: str) -> bool:
-        model = self.session.get(WorkspaceMemberModel, member_id)
-        if model is None:
-            return False
-        self.session.delete(model)
-        self.session.commit()
-        return True
-
-    @staticmethod
-    def _to_entity(model: WorkspaceMemberModel | None) -> WorkspaceMember | None:
-        if model is None:
-            return None
-        return WorkspaceMember(
-            id=model.id,
-            workspace_id=model.workspace_id,
-            user_id=model.user_id,
-            role=model.role,
-            invited_by=model.invited_by,
-            joined_at=model.joined_at,
-        )
+        return False