discard adjustable models' id prefix & payload length

app/models/workspace.py

@@ -1,11 +1,7 @@
-from typing import TYPE_CHECKING
 from sqlalchemy import Column, DateTime, String, ForeignKey, BigInteger, UniqueConstraint, Integer
 from sqlalchemy.sql import func
 from .base import AutoID, Base
 
-if TYPE_CHECKING:
-    from .user import User
-
 class Workspace(Base, AutoID):
     """工作区表"""
     __tablename__ = "workspaces"
@@ -34,13 +30,13 @@ class WorkspaceMember(Base, AutoID):
     __tablename__ = "workspace_members"
 
     workspace_id = Column(
-        String(Workspace.id_length()),
+        String(AutoID.id_length()),
         ForeignKey("workspaces.id", ondelete="CASCADE"),
         index=True,
     )
     # 允许 user_id 为空，因为被邀请的人可能还没注册系统，我们先记录他的邮箱
     user_id = Column(
-        String(User.id_length()),
+        String(AutoID.id_length()),
         ForeignKey("users.id", ondelete="CASCADE"),
         nullable=True,
         index=True,