Initial

backend/app/admin.py

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+from django.contrib import admin
+from django.contrib.auth.models import Group  # , User
+
+from app.models import City, Place
+
+# admin.site.register(Place, )
+
+#############################
+# Django defaults
+#############################
+
+admin.site.site_header = 'Leerstand-Verwaltung'  # top-most title
+admin.site.index_title = 'Leerstand'  # title at root
+admin.site.site_title = 'Leerstand-Verwaltung'  # suffix to <title>
+
+admin.site.unregister(Group)
+# admin.site.unregister(User)
+
+
+#############################
+# App adjustments
+#############################
+
+@admin.register(City)
+class CityAdmin(admin.ModelAdmin):
+    list_display = ['name', 'place_count', 'center', 'zoom']
+
+    def get_readonly_fields(self, request, obj=None):
+        return ['name'] if obj else []
+
+    @admin.display(description='Orte')
+    def place_count(self, instance: 'City'):
+        return instance.places.count()
+
+
+@admin.register(Place)
+class PlaceAdmin(admin.ModelAdmin):
+    list_display = ['address', 'city', 'since', 'until', 'created', 'updated']
+    list_filter = ['city']
+    search_fields = ['address', 'description']
+    ordering = ['-updated']