feat(agents): Phase3.2 Agent凭据Fernet加密存储 写入加密+调用点解密+返回脱敏+主密钥持久化防竞态 [v2026.07.19.7]

backend/python/app/models.py

@@ -5,6 +5,7 @@ AIFlow 数据库模型定义 - SQLAlchemy ORM
 import uuid
 from datetime import datetime, date
 from sqlalchemy import (
+    Text,
     Column, String, Integer, BigInteger, Float, Boolean,
     DateTime, Date, Text, Enum, ForeignKey, Index, JSON,
     DECIMAL, UniqueConstraint
@@ -299,7 +300,7 @@ class MarketApp(Base):
     platform = Column(String(20), default=None, comment="Agent 接入平台：dify/n8n/coze")
     capability = Column(String(20), default=None, comment="能力分类：text/thinking/vision/tool/image/audio/asr/ocr/embedding/rerank/video")
     agent_endpoint = Column(String(500), default=None)
-    agent_api_key = Column(String(500), default=None, comment="单个Agent接入的API Key")
+    agent_api_key = Column(Text, default=None, comment="Agent 接入 API Key(3.2 起 Fernet 加密存储)")
     tool_policy = Column(JSON, default=None, comment="Agent 工具/MCP 权限沙箱策略(3.1)")
     created_at = Column(DateTime, default=datetime.now)
     updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)