fix(phase26): geocode pre-caching (BUG-09) + gate trips on OBD presence (BUG-10)

modules/app_obd.py

@@ -49,6 +49,7 @@ stop_rpm = Event()
 stop_sensors = Event()
 
 connection = None
+_car_ever_connected = False
 
 
 def _decode_odometer(messages):
@@ -228,6 +229,8 @@ def connect_obd():
 
         with _connection_lock:
             connection = candidate
+        if candidate is not None:
+            _car_ever_connected = True
 
         if candidate is None:
             _emit_disconnected()
@@ -268,6 +271,11 @@ def get_fresh_speed(max_age=5):
 def obd_connection():
     """Emit current state for a newly connected browser and ensure OBD is running."""
     start_obd()
+
+
+def was_car_ever_connected():
+    """True if the car ECU has been reached at least once this session."""
+    return _car_ever_connected
     if _is_car_connected():
         app_events.socketio.emit("obd_status", obd_status[1])
         app_events.socketio.emit("obd_speed", get_speedtime())

modules/app_trip.py

@@ -81,6 +81,12 @@ def build_trip_summaries(raw_rows):
     if len(rows) < 2:
         return []
 
+    # Don't generate trips from GPS drift when the car was never connected.
+    # Without OBD, GPS jitter can produce false motion events on the bench.
+    from modules import app_obd
+    if not app_obd.was_car_ever_connected():
+        return []
+
     obd_motion = []
     gps_motion = []
     for index in range(1, len(rows)):