feat: restore source parity and harden agent runtime

backend-fastapi/online_dev/screen_design/screen_model.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+大屏设计器数据模型
+"""
+from sqlalchemy import Column, String, Text, Integer, JSON, DateTime
+
+from app.base_model import BaseModel
+
+
+class ScreenProject(BaseModel):
+    """大屏项目"""
+    __tablename__ = "screen_project"
+
+    # 所属应用（逻辑外键关联 core_application）
+    application_id = Column(String(21), nullable=True, index=True, comment="所属应用ID")
+
+    name = Column(String(100), nullable=False, comment="项目名称")
+    code = Column(String(100), unique=True, index=True, nullable=False, comment="项目编码")
+    description = Column(Text, default='', comment="项目描述")
+    status = Column(String(20), default='draft', comment="状态: draft/published")
+    version = Column(Integer, default=1, comment="版本号")
+    
+    # 缩略图
+    thumbnail = Column(Text, default='', comment="缩略图(Base64或URL)")
+    
+    # 大屏配置（存储完整的设计器配置）
+    screen_config = Column(JSON, default=dict, comment="大屏设计配置")
+    
+    # 发布相关
+    access_password = Column(String(100), default='', comment="访问密码")
+    published_at = Column(DateTime, nullable=True, comment="发布时间")
+
+    def __repr__(self):
+        return f"<ScreenProject {self.name} ({self.code})>"