interface dirextion fix

backend/src/utilities/packet_tracker.py

@@ -38,6 +38,18 @@ def _observation_signature(observation: Dict[str, Any]) -> tuple[Any, ...]:
     )
 
 
+def _parse_observation_timestamp(value: Any) -> datetime:
+    if isinstance(value, datetime):
+        return value if value.tzinfo is not None else value.replace(tzinfo=timezone.utc)
+    if value in (None, ""):
+        return datetime.max.replace(tzinfo=timezone.utc)
+    try:
+        parsed = datetime.fromisoformat(str(value))
+        return parsed if parsed.tzinfo is not None else parsed.replace(tzinfo=timezone.utc)
+    except Exception:
+        return datetime.max.replace(tzinfo=timezone.utc)
+
+
 def _bridge_af_packet_observation_groups(payload: Dict[str, Any]) -> Dict[str, set[str]]:
     groups: Dict[str, set[str]] = {}
     observations = payload.get("capture_observations") or []
@@ -87,7 +99,7 @@ def _sorted_bridge_af_packet_observations(payload: Dict[str, Any]) -> Dict[str,
         grouped.setdefault(str(session_id), []).append(observation)
 
     for session_id, items in grouped.items():
-        items.sort(key=lambda item: str(item.get("timestamp") or ""))
+        items.sort(key=lambda item: (_parse_observation_timestamp(item.get("timestamp")), str(item.get("iface") or "")))
         grouped[session_id] = items
     return grouped
 
@@ -339,7 +351,7 @@ class PacketTracker:
                 return False
 
         observations.append(normalized)
-        observations.sort(key=lambda item: str(item.get("timestamp") or ""))
+        observations.sort(key=lambda item: (_parse_observation_timestamp(item.get("timestamp")), str(item.get("iface") or "")))
         return True
 
     def _merge_packet_info(self, entry: Dict[str, Any], pkt_info: Dict[str, Any], now_ts: float) -> None:
@@ -405,8 +417,13 @@ class PacketTracker:
             return False
 
         changed = False
-        session_id = sorted(observation_groups.keys())[0]
-        observations = observation_groups[session_id]
+        session_id, observations = min(
+            observation_groups.items(),
+            key=lambda item: (
+                _parse_observation_timestamp(item[1][0].get("timestamp") if item[1] else None),
+                str(item[0]),
+            ),
+        )
         if not observations:
             return False