feat:1.数据库存储功能添加（初版）2.后端REST API版本代码清理

backend/db/models.py

@@ -0,0 +1,104 @@
+"""
+SQLAlchemy ORM 数据模型
+对应数据库表结构 (基于 DATABASE_DESIGN.md)
+"""
+
+import uuid
+from datetime import datetime, timezone
+from enum import Enum as PyEnum
+from sqlalchemy import Column, String, Text, DateTime, Integer, Enum, Index, ForeignKey
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.orm import relationship
+
+from .database import Base
+
+
+class TaskStatus(str, PyEnum):
+    """任务状态枚举"""
+    GENERATING = "generating" # 生成中 - TaskProcess 生成阶段
+    EXECUTING = "executing"  # 执行中 - 任务执行阶段
+    STOPPED = "stopped"      # 已停止 - 用户手动停止执行
+    COMPLETED = "completed"   # 已完成 - 任务正常完成
+
+
+def utc_now():
+    """获取当前 UTC 时间"""
+    return datetime.now(timezone.utc)
+
+
+class MultiAgentTask(Base):
+    """多智能体任务记录模型"""
+    __tablename__ = "multi_agent_tasks"
+
+    task_id = Column(String(64), primary_key=True)
+    user_id = Column(String(64), nullable=False, index=True)
+    query = Column(Text, nullable=False)
+    agents_info = Column(JSONB, nullable=False)
+    task_outline = Column(JSONB)
+    assigned_agents = Column(JSONB)
+    agent_scores = Column(JSONB)
+    result = Column(JSONB)
+    status = Column(
+        Enum(TaskStatus, name="task_status_enum", create_type=False),
+        default=TaskStatus.GENERATING,
+        nullable=False
+    )
+    execution_count = Column(Integer, default=0, nullable=False)
+    generation_id = Column(String(64))
+    execution_id = Column(String(64))
+    rehearsal_log = Column(JSONB)
+    branches = Column(JSONB)  # 任务大纲探索分支数据
+    created_at = Column(DateTime(timezone=True), default=utc_now)
+    updated_at = Column(DateTime(timezone=True), default=utc_now, onupdate=utc_now)
+
+    __table_args__ = (
+        Index("idx_multi_agent_tasks_status", "status"),
+        Index("idx_multi_agent_tasks_generation_id", "generation_id"),
+        Index("idx_multi_agent_tasks_execution_id", "execution_id"),
+    )
+
+    def to_dict(self) -> dict:
+        """转换为字典"""
+        return {
+            "task_id": self.task_id,
+            "user_id": self.user_id,
+            "query": self.query,
+            "agents_info": self.agents_info,
+            "task_outline": self.task_outline,
+            "assigned_agents": self.assigned_agents,
+            "agent_scores": self.agent_scores,
+            "result": self.result,
+            "status": self.status.value if self.status else None,
+            "execution_count": self.execution_count,
+            "generation_id": self.generation_id,
+            "execution_id": self.execution_id,
+            "rehearsal_log": self.rehearsal_log,
+            "branches": self.branches,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+        }
+
+
+class UserAgent(Base):
+    """用户保存的智能体配置模型 (可选表)"""
+    __tablename__ = "user_agents"
+
+    id = Column(String(64), primary_key=True)
+    user_id = Column(String(64), nullable=False, index=True)
+    agent_name = Column(String(100), nullable=False)
+    agent_config = Column(JSONB, nullable=False)
+    created_at = Column(DateTime(timezone=True), default=utc_now)
+
+    __table_args__ = (
+        Index("idx_user_agents_user_created", "user_id", "created_at"),
+    )
+
+    def to_dict(self) -> dict:
+        """转换为字典"""
+        return {
+            "id": self.id,
+            "user_id": self.user_id,
+            "agent_name": self.agent_name,
+            "agent_config": self.agent_config,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+        }