feat: Add basic metrics

src/fellchensammlung/tools/metrics.py

@@ -0,0 +1,22 @@
+from fellchensammlung.models import User, AdoptionNotice, AdoptionNoticeStatus
+
+
+def gather_metrics_data():
+    """USERS"""
+    num_user = User.objects.count()
+    num_staff = User.objects.filter(is_staff=True).count()
+
+    """Adoption notices"""
+    num_adoption_notices = AdoptionNotice.objects.count()
+    num_adoption_notices_active = AdoptionNotice.objects.filter(adoptionnoticestatus__major_status=AdoptionNoticeStatus.ACTIVE).count()
+
+    adoption_notices_without_location = AdoptionNotice.objects.filter(location__isnull=True).count()
+    data = {
+        'users': num_user,
+        'staff': num_staff,
+
+        'adoption_notices': num_adoption_notices,
+        'adoption_notices_active': num_adoption_notices_active,
+        'adoption_notices_without_location': adoption_notices_without_location
+    }
+    return data