fix: restore Hong Kong CoWIN reference curve

tests/test_country_networks.py

@@ -358,6 +358,49 @@ def test_hong_kong_cowin_primary_uses_station_6087_history(monkeypatch):
     ]
 
 
+def test_hong_kong_cowin_primary_prefers_live_intraday_series(monkeypatch):
+    from src.database import runtime_state
+
+    class FakeOfficialIntradayObservationRepository:
+        def load_points(self, *, source_code, station_code, target_date):
+            return [{"time": "09:00", "temp": 30.0}]
+
+    monkeypatch.setattr(
+        runtime_state,
+        "OfficialIntradayObservationRepository",
+        FakeOfficialIntradayObservationRepository,
+    )
+
+    snapshot = build_country_network_snapshot(
+        "hong kong",
+        {
+            "cowin_current": {
+                "temp": 31.3,
+                "obs_time": "2026-05-27T02:41:00Z",
+                "istNo": "6087",
+                "icao": "COWIN6087",
+                "station_label": "保良局陳守仁小學 1min (CoWIN)",
+            },
+            "cowin_today_obs": [
+                {"time": "10:40", "temp": 31.1},
+                {"time": "10:41", "temp": 31.3},
+            ],
+            "settlement_current": {
+                "station_code": "HKO",
+                "station_name": "HK Observatory",
+                "observation_time": "2026-05-27T10:40:00+08:00",
+                "current": {"temp": 31.2},
+            },
+        },
+    )
+
+    assert snapshot["airport_primary_current"]["source_code"] == "cowin_obs"
+    assert snapshot["airport_primary_today_obs"] == [
+        {"time": "10:40", "temp": 31.1},
+        {"time": "10:41", "temp": 31.3},
+    ]
+
+
 def test_moscow_provider_uses_realtime_metar_cluster_not_station_archive_rows():
     raw = {
         "metar": {

tests/test_cowin_sources.py

@@ -0,0 +1,87 @@
+import threading
+from datetime import datetime, timezone
+
+import httpx
+
+from src.data_collection import cowin_sources
+from src.data_collection.cowin_sources import CowinSourceMixin
+
+
+class _FakeResponse:
+    content = b"{}"
+
+    def __init__(self, payload):
+        self._payload = payload
+        self.text = "{}"
+
+    def json(self):
+        return self._payload
+
+    def raise_for_status(self):
+        return None
+
+
+class _FakeCowinCollector(CowinSourceMixin):
+    timeout = 2
+    cowin_obs_cache_ttl_sec = 0
+    _cowin_obs_cache = {}
+    _cowin_obs_cache_lock = threading.Lock()
+    user_agent = "test"
+
+    def _http_get(self, url):
+        raise httpx.ConnectError("[SSL: CERTIFICATE_VERIFY_FAILED] unable to get local issuer certificate")
+
+
+def test_cowin_current_retries_without_tls_verification_when_chain_is_incomplete(monkeypatch):
+    calls = []
+
+    def fake_get(url, **kwargs):
+        calls.append({"url": url, **kwargs})
+        return _FakeResponse(
+            {
+                "station": 6087,
+                "minutely": [
+                    {"obstime": "2026-05-28T07:59:00", "value1": 30.1},
+                    {"obstime": "2026-05-28T08:00:00", "value1": 30.0},
+                ],
+            }
+        )
+
+    monkeypatch.setattr(cowin_sources.requests, "get", fake_get)
+
+    current = _FakeCowinCollector().fetch_cowin_obs_current("hong kong")
+
+    assert current is not None
+    assert current["station_code"] == "6087"
+    assert current["current"]["temp"] == 30.0
+    assert current["obs_time"] == "2026-05-28T08:00:00+08:00"
+    assert calls
+    assert calls[0]["verify"] is False
+
+
+def test_cowin_today_series_returns_hong_kong_local_intraday_points(monkeypatch):
+    def fake_get(url, **kwargs):
+        return _FakeResponse(
+            {
+                "station": 6087,
+                "minutely": [
+                    {"obstime": "2026-05-27T23:59:00", "value1": 29.8},
+                    {"obstime": "2026-05-28T00:00:00", "value1": 29.9},
+                    {"obstime": "2026-05-28T07:58:00", "value1": 30.1},
+                    {"obstime": "2026-05-28T08:00:00", "value1": 30.0},
+                ],
+            }
+        )
+
+    monkeypatch.setattr(cowin_sources.requests, "get", fake_get)
+
+    points = _FakeCowinCollector().fetch_cowin_obs_today_series(
+        "hong kong",
+        now_utc=datetime(2026, 5, 28, 0, 5, tzinfo=timezone.utc),
+    )
+
+    assert points == [
+        {"time": "00:00", "temp": 29.9},
+        {"time": "07:58", "temp": 30.1},
+        {"time": "08:00", "temp": 30.0},
+    ]

tests/test_observation_time_sources.py

@@ -21,9 +21,9 @@ def test_aeroweb_obs_time_is_utc_aware():
     )
 
 
-def test_cowin_obs_time_uses_utc_window_when_timezone_is_missing():
-    assert _cowin_obs_time_to_iso("2026-05-27T01:15:00") == "2026-05-27T01:15:00Z"
-    assert _cowin_obs_time_to_iso("2026-05-27T09:15:00+08:00") == "2026-05-27T01:15:00Z"
+def test_cowin_obs_time_keeps_hong_kong_timezone_when_timezone_is_missing():
+    assert _cowin_obs_time_to_iso("2026-05-27T09:15:00") == "2026-05-27T09:15:00+08:00"
+    assert _cowin_obs_time_to_iso("2026-05-27T09:15:00+08:00") == "2026-05-27T09:15:00+08:00"
 
 
 def test_hko_one_minute_obs_time_keeps_hong_kong_timezone():