feat:1.历史记录重构UI重构2.置顶功能实现

backend/db/models.py

@@ -6,7 +6,7 @@ SQLAlchemy ORM 数据模型
 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 import Column, String, Text, DateTime, Integer, Enum, Index, ForeignKey, Boolean
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import relationship
 
@@ -48,6 +48,7 @@ class MultiAgentTask(Base):
     execution_id = Column(String(64))
     rehearsal_log = Column(JSONB)
     branches = Column(JSONB)  # 任务大纲探索分支数据
+    is_pinned = Column(Boolean, default=False, nullable=False)  # 置顶标志
     created_at = Column(DateTime(timezone=True), default=utc_now)
     updated_at = Column(DateTime(timezone=True), default=utc_now, onupdate=utc_now)
 
@@ -74,6 +75,7 @@ class MultiAgentTask(Base):
             "execution_id": self.execution_id,
             "rehearsal_log": self.rehearsal_log,
             "branches": self.branches,
+            "is_pinned": self.is_pinned,
             "created_at": self.created_at.isoformat() if self.created_at else None,
             "updated_at": self.updated_at.isoformat() if self.updated_at else None,
         }