feat:历史记录分享功能实现

backend/db/models.py

@@ -137,3 +137,34 @@ class UserAgent(Base):
             "agent_config": self.agent_config,
             "created_at": self.created_at.isoformat() if self.created_at else None,
         }
+
+
+class PlanShare(Base):
+    """任务分享记录模型"""
+    __tablename__ = "plan_shares"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    share_token = Column(String(64), unique=True, index=True, nullable=False)  # 唯一分享码
+    extraction_code = Column(String(8), nullable=True)  # 提取码（4位字母数字）
+    task_id = Column(String(64), nullable=False, index=True)  # 关联的任务ID
+    task_data = Column(JSONB, nullable=False)  # 完整的任务数据（脱敏后）
+    created_at = Column(DateTime(timezone=True), default=utc_now)
+    expires_at = Column(DateTime(timezone=True), nullable=True)  # 过期时间
+    view_count = Column(Integer, default=0)  # 查看次数
+
+    __table_args__ = (
+        Index("idx_plan_shares_token", "share_token"),
+    )
+
+    def to_dict(self) -> dict:
+        """转换为字典"""
+        return {
+            "id": self.id,
+            "share_token": self.share_token,
+            "extraction_code": self.extraction_code,
+            "task_id": self.task_id,
+            "task_data": self.task_data,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "expires_at": self.expires_at.isoformat() if self.expires_at else None,
+            "view_count": self.view_count,
+        }