USB external import, and filter chips on health-dot cards

plugins/usb/api/selfhosted.py

@@ -87,7 +87,10 @@ def _checkout_events(checkout):
             'device_id': checkout.device.serialnumber if checkout.device else None,
             'action': 'check-in',
             'timestamp': checkout.checkintime.isoformat() + 'Z',
-            'scanned_viruses': None,
+            # Both read from the checkout row now. scanned_viruses was
+            # hardcoded None: the shape promised the field and had nowhere to
+            # read it from, so an imported history would have shown blank.
+            'scanned_viruses': checkout.scannedviruses,
             'locker_location': None,
             'sanitized': checkout.waswiped,
         })
@@ -233,6 +236,10 @@ def checkin_device(device_id, data):
                 checkintime = override
         open_checkout.checkintime = checkintime
         open_checkout.waswiped = bool(data.get('sanitized'))
+        # None, not False, when the caller said nothing: an unrecorded scan is
+        # not a failed scan, and an audit reads those very differently.
+        scanned = data.get('scanned_viruses')
+        open_checkout.scannedviruses = None if scanned is None else bool(scanned)
         open_checkout.checkinnotes = data.get('notes')
     device.ischeckedout = False
     device.currentuserid = None