Use latest AMSC runway timestamp for overlays

src/data_collection/amsc_awos_sources.py

@@ -164,6 +164,7 @@ def _amsc_parse_wind_plate_payload(
     valid_values = []
     observation_time = None
     observation_time_local = None
+    observation_time_epoch = None
     raw_metar = None
 
     for key, raw_row in data.items():
@@ -179,8 +180,22 @@ def _amsc_parse_wind_plate_payload(
         if not points:
             continue
 
-        if observation_time is None:
-            observation_time, observation_time_local = _amsc_parse_utc_time(raw_row.get("OTIME"))
+        row_observation_time, row_observation_time_local = _amsc_parse_utc_time(raw_row.get("OTIME"))
+        row_observation_epoch = None
+        if row_observation_time:
+            try:
+                row_observation_epoch = datetime.fromisoformat(row_observation_time).timestamp()
+            except ValueError:
+                row_observation_epoch = None
+        if row_observation_epoch is not None and (
+            observation_time_epoch is None or row_observation_epoch > observation_time_epoch
+        ):
+            observation_time = row_observation_time
+            observation_time_local = row_observation_time_local
+            observation_time_epoch = row_observation_epoch
+        elif observation_time is None and row_observation_time:
+            observation_time = row_observation_time
+            observation_time_local = row_observation_time_local
         if raw_metar is None and raw_row.get("METAR"):
             raw_metar = str(raw_row.get("METAR"))