Add type assertion and debug statements in query_metrics for AP channel validation

enrichment/indexed_capture.py

@@ -137,6 +137,9 @@ class IndexedCapture:
         ]
 
     def query_metrics(self, start_ts, end_ts, ap_bssid, ap_channel):
+        ap_channel = int(ap_channel)
+        assert isinstance(ap_channel, int), f"ap_channel must be int, got {type(ap_channel)}"
+        
         packets = self.get_packets_in_time_range(start_ts, end_ts)
 
         # Build local windowed structures