Ensure stats are serialized when requested

The seen_list, tracker and aprsdthreadlist wasn't
serializing it's data when requested during stats() time..

aprsd/packets/seen_list.py

@@ -27,7 +27,20 @@ class SeenList(objectstore.ObjectStoreMixin):
     def stats(self, serializable=False):
         """Return the stats for the PacketTrack class."""
         with self.lock:
-            return self.data
+            if serializable:
+                # Convert datetime objects to strings for JSON serialization
+                serializable_data = {}
+                for callsign, data in self.data.items():
+                    serializable_data[callsign] = data.copy()
+                    if 'last' in serializable_data[callsign] and isinstance(
+                        serializable_data[callsign]['last'], datetime.datetime
+                    ):
+                        serializable_data[callsign]['last'] = serializable_data[
+                            callsign
+                        ]['last'].isoformat()
+                return serializable_data
+            else:
+                return self.data
 
     def rx(self, packet: type[core.Packet]):
         """When we get a packet from the network, update the seen list."""

aprsd/packets/tracker.py

@@ -66,6 +66,8 @@ class PacketTrack(objectstore.ObjectStoreMixin):
             pkts = {}
             for key in self.data:
                 last_send_time = self.data[key].last_send_time
+                if serializable and isinstance(last_send_time, datetime.datetime):
+                    last_send_time = last_send_time.isoformat()
                 pkts[key] = {
                     'last_send_time': last_send_time,
                     'send_count': self.data[key].send_count,

aprsd/threads/aprsd.py

@@ -107,7 +107,7 @@ class APRSDThreadList:
                 'name': th.name,
                 'class': th.__class__.__name__,
                 'alive': th.is_alive(),
-                'age': th.loop_age(),
+                'age': age,
                 'loop_count': th.loop_count,
             }
         return stats