改用Grok联网搜索并保留每轮信号

app/db/models.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 from datetime import datetime
 from typing import Optional
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, JSON, String, Text, func
+from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, JSON, String, Text, UniqueConstraint, func
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 
@@ -41,6 +41,9 @@ class AgentRun(Base):
 
 class Signal(Base):
     __tablename__ = "signals"
+    __table_args__ = (
+        UniqueConstraint("run_id", "source_url_hash", name="uq_signals_run_source_url_hash"),
+    )
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
     run_id: Mapped[int] = mapped_column(ForeignKey("agent_runs.id"), nullable=False, index=True)
@@ -49,7 +52,7 @@ class Signal(Base):
     title: Mapped[str] = mapped_column(String(300), nullable=False)
     summary: Mapped[str] = mapped_column(Text, nullable=False)
     source_url: Mapped[str] = mapped_column(Text, nullable=False)
-    source_url_hash: Mapped[str] = mapped_column(String(64), nullable=False, unique=True)
+    source_url_hash: Mapped[str] = mapped_column(String(64), nullable=False)
     source_name: Mapped[str] = mapped_column(String(200), nullable=False)
     published_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
     importance: Mapped[int] = mapped_column(Integer, nullable=False)