show alert-danger if client last_seen older then 5 minutes

billard/migrations/0026_client_last_seen.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.0.2 on 2018-02-11 11:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('billard', '0025_auto_20180211_1059'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='client',
+            name='last_seen',
+            field=models.DateTimeField(blank=True, null=True, verbose_name='Letzter Update'),
+        ),
+    ]