test(server): v1/v2混合停留聚合回归+聚合点核查适配

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

server/tracker/tests/test_dashboard.py

@@ -4,6 +4,8 @@ from django.contrib.auth import get_user_model
 from django.utils import timezone
 from rest_framework.test import APIClient
 from tracker.models import DailyStat, Event, Site, SourceClassification, VisitSession, Visitor
+from tracker.services.ingest import ingest_batch
+from tracker.tests.test_ingest import SITE_ID, _batch, _ev, _v2_batch, _v2_event
 
 pytestmark = pytest.mark.django_db
 User = get_user_model()
@@ -263,3 +265,28 @@ def test_overview_site_filter_and_404(client, member_user):
     assert r.status_code == 404
     body = r.json()
     assert body["code"] == 404 and body["data"] is None and body["message"] == "site_not_found"
+
+
+def test_overview_avg_stay_mixed_v1_v2_session(client, member_user):
+    """v1+v2 混合会话回归（阶段A T4）：avg_stay_ms 读 VisitSession.stay_ms 重算值。
+    经真实 ingest 落库——v1 page_stay active_ms=8000（加法）+ v2 同 page_id 相邻区间
+    [0,15000][15000,30000]（并集=30000，非加法 60000）→ 会话 stay_ms=38000；
+    单会话 avg=38000/1。聚合点不直接 SUM(Event.properties.active_ms)，
+    T3 重算式回写后读数侧自动正确——本用例钉死该语义不被回归。"""
+    _auth(client, member_user)
+    site = Site.objects.create(name="s", domains=["a.com"], site_id=SITE_ID)
+    ingest_batch(site, _batch(                      # v1 批：建会话 sm + v1 停留增量
+        [_ev(1), _ev(2, "page_stay", properties={"active_ms": 8000, "path": "/p"})],
+        sid="sm"))
+    r = ingest_batch(site, _v2_batch([              # v2 批：同会话同 page_id 两段相邻区间
+        _v2_event("page_stay", "p1", "sm", seq=1,
+                  active_from=0, active_to=15000, flush_reason="periodic"),
+        _v2_event("page_stay", "p1", "sm", seq=2,
+                  active_from=15000, active_to=30000, flush_reason="periodic")],
+        sid="sm"))
+    assert (r["accepted"], r["rejected"]) == (2, [])
+    assert VisitSession.objects.get(session_id="sm").stay_ms == 38000   # 写侧：v1 SUM + v2 并集
+
+    d = client.get("/api/admin/dashboard/overview", {"range": "today"}).json()["data"]
+    assert d["cards"]["visits"]["value"] == 1
+    assert d["cards"]["avg_stay_ms"] == {"value": 38000, "delta_pct": None}   # 38000/1；上期无会话 → None