feat: restore source parity and harden agent runtime

backend-fastapi/online_dev/screen_design/material_model.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+大屏素材数据模型
+"""
+from sqlalchemy import Column, String
+
+from app.base_model import BaseModel
+
+
+class ScreenMaterialCategory(BaseModel):
+    """大屏素材分类"""
+    __tablename__ = "screen_material_category"
+
+    name = Column(String(50), nullable=False, comment="分类名称")
+    code = Column(String(50), unique=True, index=True, nullable=False, comment="分类编码")
+    icon = Column(String(50), default='Image', comment="图标名称")
+
+    def __repr__(self):
+        return f"<ScreenMaterialCategory {self.name}>"
+
+
+class ScreenMaterial(BaseModel):
+    """大屏素材"""
+    __tablename__ = "screen_material"
+
+    category_id = Column(String(32), nullable=True, index=True, comment="分类ID")
+    name = Column(String(100), nullable=False, comment="素材名称")
+    file_id = Column(String(32), nullable=True, comment="文件ID（关联文件管理器）")
+
+    def __repr__(self):
+        return f"<ScreenMaterial {self.name}>"