fix(growth): rank the rate board by a smoothed score

Show the real percentage on the card, but sort with delta / (baseline + prior) so a small baseline cannot dominate. Same-day publishes stay off the rate board.

tests/test_web_queries.py

@@ -492,6 +492,7 @@ def test_about_payload():
                 "video_shrink_minutes": 60,
                 "shrink_minutes": None,
                 "home_growth_days": "auto",
+                "growth_rate_prior": 500,
             }
             assert about["heat_weights"]["view"] == 0.30
             assert about["followers"]["videos_total"] == 3
@@ -748,12 +749,18 @@ def test_same_day_growth_baselines():
             assert 106 not in by_aid and 107 not in by_aid
             assert by_aid[103]["growth"]["baseline"] == "zero"
             assert by_aid[103]["growth"]["delta"] == 200
+            assert by_aid[103]["growth"]["rate"] is None
             assert by_aid[103]["growth"]["gap_days"] == 0
             assert by_aid[105]["growth"]["baseline"] == "open"
             assert by_aid[105]["growth"]["delta"] == 300
             assert by_aid[101]["growth"]["baseline"] == "snapshot"
             assert by_aid[101]["growth"]["delta"] == 100
 
+            rate = q.list_videos(sort="growth_rate", growth_days=1, page_size=20)
+            rate_aids = {item["aid"] for item in rate["items"]}
+            assert 103 not in rate_aids
+            assert 101 in rate_aids and 105 in rate_aids
+
             seven = q.list_videos(sort="growth", growth_days=7)
             seven_aids = {item["aid"] for item in seven["items"]}
             assert 103 not in seven_aids
@@ -774,6 +781,41 @@ def test_same_day_growth_baselines():
             db.close()
 
 
+def test_growth_rate_sort_uses_prior():
+    """小基数的真实增速可以更高，排序分用基线 + prior，不按 raw rate 排。"""
+    with tempfile.TemporaryDirectory() as tmp:
+        db, q = setup(tmp)
+        try:
+            repo = Repository(db)
+            latest = DATES[-1]
+            previous_day = DATES[-2]
+            start = int(day_bounds(latest)[0])
+            pub = int(day_bounds("2026-09-01")[0])
+            for aid, views in ((301, (80, 512)), (302, (2000, 4000))):
+                repo.upsert_from_fav(
+                    resource(aid, up_mid=1, up_name="UP A", pubdate=pub),
+                    FOLDER.media_id, was_added=True, now=start,
+                )
+                repo.upsert_snapshot(
+                    previous_day, aid, metrics=_view_metrics(views[0]),
+                    ok=True, err=None, captured_at=start - 86400,
+                )
+                repo.upsert_snapshot(
+                    latest, aid, metrics=_view_metrics(views[1]),
+                    ok=True, err=None, captured_at=start + 60,
+                )
+            DASHBOARD_CACHE.clear()
+            ranked = q.list_videos(sort="growth_rate", growth_days=1, page_size=20)
+            order = [item["aid"] for item in ranked["items"]]
+            assert ranked["growth_rate_prior"] == 500
+            assert order.index(302) < order.index(301)
+            small = next(item for item in ranked["items"] if item["aid"] == 301)
+            assert abs(small["growth"]["rate"] - 432 / 80) < 1e-12
+            assert small["growth"]["delta"] == 432
+        finally:
+            db.close()
+
+
 def test_system_tasks_sorted_by_started_at_desc():
     """最近任务按 started_at 倒序；缺开始时间的排末尾（含进行中无 finished）。"""
     import json
@@ -835,6 +877,7 @@ def main_test():
     test_snapshot_recent_next_run_follows_completion()
     test_overview_adjacent_previous_with_seed_and_dual_fields()
     test_same_day_growth_baselines()
+    test_growth_rate_sort_uses_prior()
     print("OK: Web 查询层总览/榜单/详情/UP/时长效率/粉丝/候选/系统/访问统计测试全部通过")