fix: trending section blank when scores are stale + trend scorer error isolation

Dashboard _get_trending() was querying scores within 1 day only — if the
nightly trend task hadn't run (e.g. worker restarted mid-run), the trending
section returned empty. Now falls back through 1→3→7→30 day windows so
stale scores always surface something.

Trend scorer now wraps per-bill scoring in try/except so a single bad
newsapi/gnews call can't abort the entire 1600-bill run.

Authored by: Jack Levy

backend/app/api/dashboard.py

@@ -16,16 +16,20 @@ router = APIRouter()
 
 
 async def _get_trending(db: AsyncSession) -> list[dict]:
+    # Try progressively wider windows so stale scores still surface results
+    for days_back in (1, 3, 7, 30):
         trending_result = await db.execute(
             select(Bill)
             .options(selectinload(Bill.sponsor), selectinload(Bill.briefs), selectinload(Bill.trend_scores))
             .join(TrendScore, Bill.bill_id == TrendScore.bill_id)
-        .where(TrendScore.score_date >= date.today() - timedelta(days=1))
+            .where(TrendScore.score_date >= date.today() - timedelta(days=days_back))
             .order_by(desc(TrendScore.composite_score))
             .limit(10)
         )
         trending_bills = trending_result.scalars().unique().all()
+        if trending_bills:
             return [_serialize_bill(b) for b in trending_bills]
+    return []
 
 
 def _serialize_bill(bill: Bill) -> dict:

backend/app/workers/trend_scorer.py

@@ -91,6 +91,7 @@ def calculate_all_trend_scores(self):
             gtrends_scores = trends_service.get_trends_scores_batch(keyword_groups)
 
             for i, bill in enumerate(batch):
+                try:
                     query = bill_queries[i]
                     # NewsAPI + Google News counts (gnews served from 2-hour cache)
                     newsapi_articles = news_service.fetch_newsapi_articles(query, days=30)
@@ -109,6 +110,8 @@ def calculate_all_trend_scores(self):
                         composite_score=composite,
                     ))
                     scored += 1
+                except Exception as exc:
+                    logger.warning(f"Trend scoring skipped for {bill.bill_id}: {exc}")
 
             db.commit()