fix: odometer sync is Pi→Server only — portal displays read-only value from DB

server/app.py

@@ -788,8 +788,27 @@ def api_device_config_push():
     
     Pi pushes local config changes to server. Accepts a partial update:
     any of owner_name, car_model, device_name, avatar_path, odometer_baseline.
+    odometer_baseline is Pi→Server only — the portal cannot edit it.
     """
     body = request.get_json(silent=True) or {}
+    
+    # Handle odometer_baseline separately — Pi→Server only.
+    odometer = body.pop("odometer_baseline", None)
+    if odometer is not None:
+        try:
+            odometer = float(odometer)
+            if odometer < 0 or odometer > 999999:
+                return jsonify(error="Invalid device config.", 
+                               fields={"odometer_baseline": "Must be between 0 and 999,999 km."}), 400
+        except (TypeError, ValueError):
+            return jsonify(error="Invalid device config.",
+                           fields={"odometer_baseline": "Must be a number."}), 400
+        with db.get_cursor(commit=True) as cur:
+            cur.execute(
+                "UPDATE devices SET odometer_baseline = %s, config_version = config_version + 1, config_updated_at = now() WHERE id = %s",
+                (odometer, g.device_id),
+            )
+    
     success, errors = device_config.update_device_config(g.device_id, body)
     if not success:
         return jsonify(error="Invalid device config.", fields=errors), 400

server/modules/device_config.py

@@ -42,7 +42,8 @@ def update_device_config(device_id, data):
     car_model = data.get("car_model", "").strip() if "car_model" in data else None
     device_name = data.get("device_name", "").strip() if "device_name" in data else None
     avatar_path = data.get("avatar_path", "").strip() if "avatar_path" in data else None
-    odometer_baseline = data.get("odometer_baseline") if "odometer_baseline" in data else None
+    # odometer_baseline is NOT accepted here — it's Pi→Server only,
+    # handled directly in the /api/device-config/push endpoint.
     
     if owner_name is not None and len(owner_name) > 100:
         errors["owner_name"] = "Owner name must be 1-100 characters."
@@ -52,19 +53,12 @@ def update_device_config(device_id, data):
         errors["device_name"] = "Device name must be 1-100 characters."
     if avatar_path is not None and len(avatar_path) > 255:
         errors["avatar_path"] = "Avatar path must be 1-255 characters."
-    if odometer_baseline is not None:
-        try:
-            odometer_baseline = float(odometer_baseline)
-            if odometer_baseline < 0 or odometer_baseline > 999999:
-                errors["odometer_baseline"] = "Must be between 0 and 999,999 km."
-        except (TypeError, ValueError):
-            errors["odometer_baseline"] = "Must be a number."
     
     if errors:
         return False, errors
     
     with db.get_cursor(commit=True) as cur:
-        changed = owner_name is not None or car_model is not None or device_name is not None or avatar_path is not None or odometer_baseline is not None
+        changed = owner_name is not None or car_model is not None or device_name is not None or avatar_path is not None
         if changed:
             cur.execute(
                 "UPDATE devices SET config_version = config_version + 1, config_updated_at = now() WHERE id = %s",
@@ -79,7 +73,5 @@ def update_device_config(device_id, data):
             cur.execute("UPDATE devices SET device_name = %s WHERE id = %s", (device_name, device_id))
         if avatar_path is not None:
             cur.execute("UPDATE devices SET avatar_path = %s WHERE id = %s", (avatar_path, device_id))
-        if odometer_baseline is not None:
-            cur.execute("UPDATE devices SET odometer_baseline = %s WHERE id = %s", (odometer_baseline, device_id))
     
     return True, {}

server/templates/device_settings.html

@@ -104,8 +104,8 @@
                         </div>
                         <div class="col-12 col-md-6">
                             <label class="form-label" for="odometer_baseline">Odometer baseline (km)</label>
-                            <input class="form-control" id="odometer_baseline" name="odometer_baseline" type="number" inputmode="decimal" min="0" max="999999" step="0.1" disabled>
+                            <input class="form-control text-muted" id="odometer_baseline" name="odometer_baseline" type="number" inputmode="decimal" min="0" max="999999" step="0.1" readonly>
-                            <div class="form-text">Enter the car's current odometer reading. The app adds trip distances to this baseline. Synced to the Pi on next config sync.</div>
+                            <div class="form-text">Synced from the Pi — cannot be edited here. The Pi adds trip distances to this baseline.</div>
                         </div>
                     </div>
                 </form>

static/js/portal-device-settings.js

@@ -28,9 +28,12 @@ const fields = {
     car_model: document.getElementById('car_model'),
     device_name: document.getElementById('device_name'),
     avatar_path: document.getElementById('avatar_path'),
-    odometer_baseline: document.getElementById('odometer_baseline'),
 };
 
+// Read-only display field — populated from server config, never sent on save.
+// Odometer is Pi→Server only: the Pi pushes its baseline, the portal just shows it.
+const odometerField = document.getElementById('odometer_baseline');
+
 let devices = [];
 let selectedDeviceId = null;
 let initialState = null;
@@ -57,7 +60,6 @@ function currentState() {
         car_model: fields.car_model.value.trim(),
         device_name: fields.device_name.value.trim(),
         avatar_path: fields.avatar_path.value.trim(),
-        odometer_baseline: Number(fields.odometer_baseline.value) || 0,
     };
 }
 
@@ -117,7 +119,7 @@ function populateDevice(device, config) {
     fields.car_model.value = config.car_model || '';
     fields.device_name.value = config.device_name || '';
     fields.avatar_path.value = config.avatar_path || '';
-    fields.odometer_baseline.value = (config.odometer_baseline || 0).toFixed(1);
+    odometerField.value = (config.odometer_baseline || 0).toFixed(1);
     initialState = currentState();
     credentialFields.deviceName.value = device.name;
     renderDeviceList();