fix: 趋势改实时聚合+DailyStat自愈回写，摆脱cron依赖

Co-Authored-By: Claude Code <noreply@anthropic.com>

server/tracker/tests/test_dashboard.py

@@ -3,8 +3,7 @@ from datetime import timedelta
 from django.contrib.auth import get_user_model
 from django.utils import timezone
 from rest_framework.test import APIClient
-from tracker.models import Event, Site, SourceClassification, VisitSession, Visitor
-from tracker.services.stats import refresh_daily
+from tracker.models import DailyStat, Event, Site, SourceClassification, VisitSession, Visitor
 
 pytestmark = pytest.mark.django_db
 User = get_user_model()
@@ -103,11 +102,13 @@ def test_overview_7d_cards_and_deltas(client, member_user):
     assert d["cards"]["returning"] == {"value": 1, "delta_pct": None}      # 上期 0 → null
     # 在线：v1/v2/v3 活跃（bot 排除、v4 十天前不在线）
     assert d["header"] == {"online": 3, "active_now": 3}   # active_now 兼容保留
-    # 趋势：7 点日粒度，历史无 DailyStat 补零，今天一位用实时值（uv=2、sessions=2，bot 排除）
+    # 趋势：7 点日粒度实时聚合，无数据的日补零——3 天前 v3 回访有真实值
+    # （uv=1、sessions=1，bot 排除），不依赖 DailyStat/聚合作业
     trend = d["trend"]
     assert len(trend) == 7
     assert trend[0]["date"] == (TODAY - timedelta(days=6)).isoformat()
     assert trend[-1] == {"date": TODAY.isoformat(), "uv": 2, "sessions": 2}
+    assert trend[-4] == {"date": (TODAY - timedelta(days=3)).isoformat(), "uv": 1, "sessions": 1}
     assert trend[-2] == {"date": YESTERDAY.isoformat(), "uv": 0, "sessions": 0}
     assert d["channels"] == []                               # 无分类行 → 空列表
 
@@ -183,26 +184,52 @@ def test_overview_range_today(client, member_user):
     assert len(d["trend"]) == 30
 
 
-def test_overview_trend_uses_dailystat_history(client, member_user):
-    """7d 趋势历史位读 DailyStat 聚合（跨站求和），今天位用实时值。"""
+def test_overview_trend_realtime_and_selfheal(client, member_user):
+    """趋势不依赖 DailyStat/聚合作业：昨天+今天的数据（不跑 refresh_daily）
+    两天都有真实值（昨天跨站求和）；调用后 DailyStat 自愈出现对应行（update_or_create 幂等）。"""
     _auth(client, member_user)
     site_a = Site.objects.create(name="a", domains=["a.com"])
     site_b = Site.objects.create(name="b", domains=["b.com"])
     yn = NOW - timedelta(days=1)   # 昨天同一本地时刻，必落上海昨日窗口
-    va = Visitor.objects.create(site=site_a, visitor_id="va")
+    va = _visitor(site_a, "va", last_seen=yn, first_seen=yn)
     sa = _session(site_a, va, "sa", at=yn)
     _events(site_a, va, sa, 3, "/", at=yn, prefix="ya")
-    refresh_daily(site_a, YESTERDAY)
-    vb = Visitor.objects.create(site=site_b, visitor_id="vb")
+    vb = _visitor(site_b, "vb", last_seen=yn, first_seen=yn)
     sb = _session(site_b, vb, "sb", at=yn)
     _events(site_b, vb, sb, 4, "/", at=yn, prefix="yb")
-    refresh_daily(site_b, YESTERDAY)
+    # 今天：site_b 一个新访客一条会话两条事件
+    vt = _visitor(site_b, "vt", last_seen=timezone.now())
+    st = _session(site_b, vt, "st")
+    _events(site_b, vt, st, 2, "/t", prefix="t")
+    assert DailyStat.objects.count() == 0                 # 前置：聚合作业从未跑过
 
     d = client.get("/api/admin/dashboard/overview").json()["data"]
     trend = d["trend"]
     assert len(trend) == 7
     assert trend[-2] == {"date": YESTERDAY.isoformat(), "uv": 2, "sessions": 2}  # 跨站求和
-    assert trend[-1] == {"date": TODAY.isoformat(), "uv": 0, "sessions": 0}      # 今天无事件
+    assert trend[-1] == {"date": TODAY.isoformat(), "uv": 1, "sessions": 1}
+    # 自愈回写：按站按日出现三行，四指标口径与 daily_counts 一致
+    ra = DailyStat.objects.get(site=site_a, date=YESTERDAY)
+    assert (ra.pv, ra.uv, ra.sessions, ra.new_visitors) == (3, 1, 1, 1)
+    rb = DailyStat.objects.get(site=site_b, date=YESTERDAY)
+    assert (rb.pv, rb.uv, rb.sessions, rb.new_visitors) == (4, 1, 1, 1)
+    rt = DailyStat.objects.get(site=site_b, date=TODAY)
+    assert (rt.pv, rt.uv, rt.sessions, rt.new_visitors) == (2, 1, 1, 1)
+    assert DailyStat.objects.count() == 3
+    client.get("/api/admin/dashboard/overview")           # 再调一次：update 不重复建行
+    assert DailyStat.objects.count() == 3
+
+
+def test_overview_trend_empty_window_no_write(client, member_user):
+    """空窗口：趋势为全零序列，且不写任何 DailyStat（自愈只写有数据的日）。"""
+    _auth(client, member_user)
+    Site.objects.create(name="s", domains=["a.com"])
+    d = client.get("/api/admin/dashboard/overview").json()["data"]
+    trend = d["trend"]
+    assert len(trend) == 7
+    assert trend[0]["date"] == (TODAY - timedelta(days=6)).isoformat()
+    assert all(p["uv"] == 0 and p["sessions"] == 0 for p in trend)
+    assert DailyStat.objects.count() == 0
 
 
 def test_overview_site_filter_and_404(client, member_user):
@@ -217,10 +244,9 @@ def test_overview_site_filter_and_404(client, member_user):
     _events(site_b, vb, sb, 5, "/b", prefix="b")
     SourceClassification.objects.create(site=site_b, visitor=vb, session=sb,
         scope="session_entry", channel="direct", resolution="unknown")
-    # a 站昨天有 DailyStat 行——过滤 site_b 时不得混入
+    # a 站昨天有数据（实时聚合）——过滤 site_b 时不得混入
     yn = NOW - timedelta(days=1)
     _events(site_a, va, sa, 3, "/", at=yn, prefix="ay")
-    refresh_daily(site_a, YESTERDAY)
 
     d = client.get("/api/admin/dashboard/overview").json()["data"]
     assert d["cards"]["visitors"]["value"] == 2          # 缺省聚合全部站点