改用mysql

backend/app/models/document_category.py

@@ -35,7 +35,7 @@ class DocumentCategory(UUIDPrimaryKeyMixin, TimestampMixin, Base):
         comment="分类名称",
     )
     path: Mapped[str] = mapped_column(
-        Text,
+        String(500),
         default="/",
         nullable=False,
         comment="物化路径，如 /01_公司层/04_岗位AI角色/",

backend/app/models/user.py

@@ -39,6 +39,12 @@ class User(UUIDPrimaryKeyMixin, TimestampMixin, Base):
         nullable=False,
         comment="状态 (active/disabled)",
     )
+    role: Mapped[str] = mapped_column(
+        String(16),
+        default="customer",
+        nullable=False,
+        comment="角色 (internal=内部员工 / customer=客户)",
+    )
     plan_id: Mapped[str] = mapped_column(
         String(32),
         ForeignKey("plans.id"),