Add owner and device type filters to device list

Owner filter uses a server-side substring match (LIKE '%VALUE%');
device type filter matches the stored value exactly, sending an
empty string for unknown/unclassified devices. Both filters combine
with the existing registration status chip via AND logic.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/db/devices.rs

@@ -54,8 +54,8 @@ pub fn list_devices(
     };
     if let Some(owner) = owner {
         debug!("Adding filter owner={}", owner);
-        sql_statement.push_str("AND owner=? ");
+        sql_statement.push_str("AND owner LIKE ? ");
-        params.push(owner.into());
+        params.push(format!("%{}%", owner).into());
     };
     if let Some(device_type) = device_type {
         debug!("Adding filter device_type={}", device_type);
@@ -241,6 +241,27 @@ mod tests {
             "Vendor 2".to_string(),
         );
 
+        // Filter by owner substring - "oh" matches "John" but not "Sarah"
+        let devices: Vec<Device> =
+            list_devices(None, None, None, Some("oh".to_string()), None, None).unwrap();
+
+        assert!(
+            devices.len() >= 1,
+            "There should be at least one device matching owner 'oh'"
+        );
+        assert!(
+            devices
+                .iter()
+                .any(|item| item.mac_address == "bb:bb:bb:bb:bb:bb"),
+            "Device bb:bb:bb:bb:bb:bb (John) should be present"
+        );
+        assert!(
+            !devices
+                .iter()
+                .any(|item| item.mac_address == "cc:cc:cc:cc:cc:cc"),
+            "Device cc:cc:cc:cc:cc:cc (Sarah) should not be present"
+        );
+
         // List devices seen in a time period - 2026-02-03 13:14:15
         let devices = list_devices(
             None,

frontend/lib/devices/device_list.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 
@@ -22,18 +24,29 @@ class _DeviceListState extends State<DeviceList> {
   List<Device> _devices = [];
   bool _isLoading = true;
   String? _error;
+  final TextEditingController _ownerController = TextEditingController();
+  DeviceType? _typeFilter;
+  Timer? _ownerDebounce;
 
   @override
   void initState() {
     super.initState();
+    _ownerController.addListener(_onOwnerChanged);
     _loadDevices();
   }
 
   @override
   void dispose() {
+    _ownerDebounce?.cancel();
+    _ownerController.dispose();
     super.dispose();
   }
 
+  void _onOwnerChanged() {
+    _ownerDebounce?.cancel();
+    _ownerDebounce = Timer(const Duration(milliseconds: 500), _loadDevices);
+  }
+
   Future<void> _loadDevices() async {
     setState(() {
       _isLoading = _devices.isEmpty;
@@ -46,6 +59,8 @@ class _DeviceListState extends State<DeviceList> {
 
       final devices = await BackendAPI.instance.listDevices(
         isRegistered: isRegistered,
+        owner: _ownerController.text.isEmpty ? null : _ownerController.text,
+        deviceType: _typeFilter,
       );
       if (!mounted) return;
       setState(() {
@@ -81,9 +96,14 @@ class _DeviceListState extends State<DeviceList> {
       appBar: AppBar(title: const Text('Devices')),
       body: Column(
         children: [
-          Container(
+          Padding(
-            height: 50,
+            padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 4.0),
-            alignment: Alignment.centerRight,
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                SingleChildScrollView(
+                  scrollDirection: Axis.horizontal,
                   child: Wrap(
                     spacing: 8.0,
                     children: [
@@ -114,6 +134,60 @@ class _DeviceListState extends State<DeviceList> {
                     ],
                   ),
                 ),
+                const SizedBox(height: 8),
+                Row(
+                  children: [
+                    Expanded(
+                      flex: 2,
+                      child: TextField(
+                        controller: _ownerController,
+                        decoration: const InputDecoration(
+                          labelText: 'Owner',
+                          prefixIcon: Icon(Icons.person_outline),
+                          isDense: true,
+                          border: OutlineInputBorder(),
+                        ),
+                      ),
+                    ),
+                    const SizedBox(width: 8),
+                    Expanded(
+                      child: DropdownButtonFormField<DeviceType?>(
+                        initialValue: _typeFilter,
+                        decoration: const InputDecoration(
+                          labelText: 'Type',
+                          isDense: true,
+                          border: OutlineInputBorder(),
+                        ),
+                        items: [
+                          const DropdownMenuItem(
+                            value: null,
+                            child: Text('All'),
+                          ),
+                          ...DeviceType.values.map(
+                            (t) => DropdownMenuItem(
+                              value: t,
+                              child: Row(
+                                children: [
+                                  Icon(t.icon, size: 16),
+                                  const SizedBox(width: 4),
+                                  Text(t.label),
+                                ],
+                              ),
+                            ),
+                          ),
+                        ],
+                        onChanged: (value) {
+                          setState(() => _typeFilter = value);
+                          _loadDevices();
+                        },
+                      ),
+                    ),
+                  ],
+                ),
+                const SizedBox(height: 4),
+              ],
+            ),
+          ),
           Expanded(
             child: _isLoading
                 ? const Center(child: CircularProgressIndicator())

frontend/lib/utils/oott_api.dart

@@ -5,6 +5,7 @@ import 'package:encrypter/encrypter/xor.dart';
 import 'package:flutter/foundation.dart';
 import 'package:frontend/utils/pref_utils.dart';
 import '../model/device.dart';
+import '../model/device_type.dart';
 import '../model/notification.dart';
 
 class BackendAPI {
@@ -90,11 +91,20 @@ class BackendAPI {
     return Device.fromJson(response.data as Map<String, dynamic>);
   }
 
-  Future<List<Device>> listDevices({bool? isRegistered}) async {
+  Future<List<Device>> listDevices({
+    bool? isRegistered,
+    String? owner,
+    DeviceType? deviceType,
+  }) async {
     debugPrint('About to call /devices');
 
     final params = <String, dynamic>{};
     if (isRegistered != null) params['is_registered'] = isRegistered;
+    if (owner != null && owner.isNotEmpty) params['owner'] = owner;
+    if (deviceType != null) {
+      params['device_type'] =
+          deviceType == DeviceType.unknown ? '' : deviceType.name;
+    }
 
     final response = await _dio.get('/devices', queryParameters: params);