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)

app/db/repository.py

@@ -1,8 +1,6 @@
 from __future__ import annotations
 
 from hashlib import sha256
-from typing import Optional
-
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
@@ -41,21 +39,22 @@ class AgentRepository:
         self.db.flush()
 
     def save_signals(self, run: AgentRun, items: list[SignalItem]) -> list[Signal]:
-        # 相同来源链接只保存一次，避免日报和仪表盘重复出现同一条情报。
+        # 去重范围限定在同一次运行内，保证每轮情报结果都能完整留档。
         saved: list[Signal] = []
         for item in items:
             signal = self.save_or_update_signal(run=run, item=item)
-            if signal is None:
-                continue
             saved.append(signal)
         return saved
 
-    def save_or_update_signal(self, run: AgentRun, item: SignalItem) -> Optional[Signal]:
-        # 同一来源链接只保留一条情报，流式接口和普通接口共用这条去重规则。
+    def save_or_update_signal(self, run: AgentRun, item: SignalItem) -> Signal:
+        # 同一次运行里相同链接更新为一条，跨运行保留各自结果用于历史对比。
         source_url_hash = self._source_url_hash(item.source_url)
-        existing = self.db.scalar(select(Signal).where(Signal.source_url_hash == source_url_hash))
-        if existing and existing.run_id != run.id:
-            return None
+        existing = self.db.scalar(
+            select(Signal).where(
+                Signal.run_id == run.id,
+                Signal.source_url_hash == source_url_hash,
+            )
+        )
         if existing:
             existing.source_type = item.source_type
             existing.topic = item.topic