big update

backend/app/api/endpoints/revisions.py

@@ -0,0 +1,75 @@
+# 公关修改追踪 API：查询热搜标题被偷偷修改的历史记录
+from datetime import timedelta
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.orm import Session
+
+from app.api.dependencies import get_db
+from app.models.models import HeadlineRevision, InfoSource, TrendingEvent, utcnow
+from pydantic import BaseModel, ConfigDict
+from datetime import datetime
+
+router = APIRouter()
+
+
+class HeadlineRevisionResponse(BaseModel):
+    """标题修改记录响应体"""
+    id: int
+    event_id: int
+    previous_headline: str
+    revised_headline: str
+    source_name: Optional[str] = None
+    platform_icon: Optional[str] = None
+    created_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+@router.get("/headline-revisions", response_model=List[HeadlineRevisionResponse])
+def list_headline_revisions(
+    hours: int = Query(48, ge=1, le=720, description="查询最近多少小时内的修改记录"),
+    limit: int = Query(50, ge=1, le=500, description="最多返回条数"),
+    db: Session = Depends(get_db),
+):
+    """
+    获取最近的标题修改记录列表。
+    用于公关监测：发现哪些平台偷偷改了热搜标题。
+    """
+    time_limit = utcnow() - timedelta(hours=hours)
+
+    rows = (
+        db.query(HeadlineRevision, InfoSource.source_name)
+        .join(TrendingEvent, HeadlineRevision.event_id == TrendingEvent.id)
+        .join(InfoSource, TrendingEvent.source_id == InfoSource.id)
+        .filter(HeadlineRevision.created_at >= time_limit)
+        .order_by(HeadlineRevision.created_at.desc())
+        .limit(limit)
+        .all()
+    )
+
+    # 平台名到图标的简单映射
+    icon_map = {
+        "微博热搜": "weibo",
+        "知乎热榜": "zhihu",
+        "百度热搜": "baidu",
+        "今日头条": "toutiao",
+        "抖音热榜": "douyin",
+        "B站热搜": "bilibili",
+    }
+
+    results: list[HeadlineRevisionResponse] = []
+    for revision, source_name in rows:
+        results.append(
+            HeadlineRevisionResponse(
+                id=revision.id,
+                event_id=revision.event_id,
+                previous_headline=revision.previous_headline,
+                revised_headline=revision.revised_headline,
+                source_name=source_name,
+                platform_icon=icon_map.get(source_name, "newspaper"),
+                created_at=revision.created_at,
+            )
+        )
+
+    return results