Filter runway history by observation time

tests/test_observation_collector.py

@@ -1,4 +1,5 @@
 from concurrent.futures import ThreadPoolExecutor, TimeoutError
+from datetime import datetime, timedelta, timezone
 import sqlite3
 import threading
 import time
@@ -270,11 +271,12 @@ def test_observation_collector_persists_amsc_runway_history(tmp_path):
         observation_store=db,
     )
 
+    observed_at = datetime.now(timezone.utc).replace(microsecond=0).isoformat()
     record = ObservationRecord(
         source="amsc_awos",
         city="chengdu",
         value=28.4,
-        observed_at="2026-06-15T10:51:00+00:00",
+        observed_at=observed_at,
         observed_at_local="2026-06-15 18:51:00",
         station_code="ZUUU",
         station_name="Chengdu Shuangliu",
@@ -313,11 +315,40 @@ def test_observation_collector_persists_amsc_runway_history(tmp_path):
     rows = db.get_runway_obs_recent("ZUUU", minutes=60)
 
     assert [row["runway"] for row in rows] == ["02L/20R", "02R/20L"]
-    assert rows[0]["otime_utc"] == "2026-06-15T10:51:00+00:00"
+    assert rows[0]["otime_utc"] == observed_at
     assert rows[0]["target_runway_max"] == 28.4
     assert rows[0]["wind_dir"] == 130
 
 
+def test_runway_obs_recent_filters_by_observation_time_not_insert_time(tmp_path):
+    from src.database.db_manager import DBManager
+
+    db = DBManager(str(tmp_path / "polyweather.db"))
+    now = datetime.now(timezone.utc).replace(microsecond=0)
+    stale_observed_at = (now - timedelta(hours=3)).isoformat()
+    fresh_observed_at = now.isoformat()
+
+    db.append_runway_obs(
+        icao="ZUUU",
+        city="chengdu",
+        runway="02L/20R",
+        target_runway_max=24.0,
+        otime_utc=stale_observed_at,
+    )
+    db.append_runway_obs(
+        icao="ZUUU",
+        city="chengdu",
+        runway="02R/20L",
+        target_runway_max=25.0,
+        otime_utc=fresh_observed_at,
+    )
+
+    rows = db.get_runway_obs_recent("ZUUU", minutes=60)
+
+    assert [row["runway"] for row in rows] == ["02R/20L"]
+    assert rows[0]["otime_utc"] == fresh_observed_at
+
+
 def test_raw_observation_failure_preserves_last_success_and_increments_errors(tmp_path):
     from src.database.db_manager import DBManager