feat(server): schema v2契约——session_resume白名单/Event归属与区间字段/会话resume_of/request_id

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

server/tracker/tests/test_models.py

@@ -4,6 +4,16 @@ from tracker.models import Site, Visitor, VisitSession, Event
 
 pytestmark = pytest.mark.django_db
 
+
+def _base_event_kwargs():
+    """合法 Event 基线 kwargs（schema v2 测试用）"""
+    site = Site.objects.create(name="s", domains=["a.com"])
+    visitor = Visitor.objects.create(site=site, visitor_id="vid1")
+    session = VisitSession.objects.create(site=site, visitor=visitor, session_id="sid1",
+        started_at="2026-09-15T10:00:00Z", ended_at="2026-09-15T10:01:00Z")
+    return dict(site=site, visitor=visitor, session=session, event_id="e1",
+                event_name="page_stay", occurred_at="2026-09-15T10:00:30Z", path="/")
+
 def test_create_site_generates_public_site_id():
     site = Site.objects.create(name="官网", domains=["www.example.com"])
     assert site.site_id.startswith("site_") and len(site.site_id) == 21
@@ -36,3 +46,14 @@ def test_site_cascade_deletes_children():
         event_name="page_view", occurred_at="2026-09-15T10:00:00Z", path="/")
     site.delete()
     assert Visitor.objects.count() == 0 and VisitSession.objects.count() == 0 and Event.objects.count() == 0
+
+
+def test_event_has_phase_a_fields():
+    e = Event(**_base_event_kwargs(), page_id="p1", active_from_ms=0,
+              active_to_ms=15000, flush_reason="periodic",
+              time_quality="ok", sdk_version="0.2.0", schema_version=2)
+    e.full_clean()
+
+
+def test_visit_session_resume_of_self_fk():
+    assert VisitSession._meta.get_field("resume_of").related_model is VisitSession