feat: show last activity timestamp per device on Tuerschilder page

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app.py

@@ -202,9 +202,20 @@ async def toggle_user(azure_id: str):
 @app.get("/devices", response_class=HTMLResponse)
 async def devices_page(request: Request):
     conn = database.get_db()
-    devices = conn.execute(
+    devices_raw = conn.execute(
         "SELECT * FROM wled_devices ORDER BY name, hostname"
     ).fetchall()
+    # Letzte Aktivitaet pro Device aus activity_log
+    devices = []
+    for dev in devices_raw:
+        last_act = conn.execute("""
+            SELECT MAX(l.timestamp) as la
+            FROM activity_log l
+            WHERE l.wled_url LIKE '%' || ? || '%'
+        """, (dev["hostname"],)).fetchone()
+        d = dict(dev)
+        d["last_activity"] = last_act["la"] if last_act and last_act["la"] else None
+        devices.append(d)
     last_check_row = conn.execute(
         "SELECT MAX(last_check) as lc FROM wled_devices WHERE last_check IS NOT NULL"
     ).fetchone()

templates/devices.html

@@ -29,6 +29,7 @@
                                 <th>Name</th>
                                 <th>LEDs</th>
                                 <th>Version</th>
+                                <th>Letzte Aktivitaet</th>
                                 <th>Segmente</th>
                                 <th>Aktionen</th>
                             </tr>
@@ -53,6 +54,7 @@
                                 <td>{{ device.name }}</td>
                                 <td>{{ device.leds if device.leds else '-' }}</td>
                                 <td>{{ device.version if device.version else '-' }}</td>
+                                <td><small>{{ device.last_activity or '-' }}</small></td>
                                 <td>{{ device.segment_count }}</td>
                                 <td>
                                     <form method="post" action="/api/devices/{{ device.id }}/check" class="d-inline">
@@ -112,7 +114,7 @@
 
                             {% if not devices %}
                             <tr>
-                                <td colspan="7" class="text-center text-muted py-4">
+                                <td colspan="8" class="text-center text-muted py-4">
                                     Noch keine Tuerschilder vorhanden.
                                 </td>
                             </tr>