Cleanup: remove tracked pycache and db.sqlite3; add map membership backfill, new components, backups, docs

backend/contacts/serializers.py

@@ -142,7 +142,7 @@ class NetworkMapMembershipSerializer(serializers.ModelSerializer):
             'map_angle', 'map_radius_ratio',
             'created_at', 'updated_at',
         ]
-        read_only_fields = ['id', 'created_at', 'updated_at', 'contact_name', 'map_name']
+        read_only_fields = ['id', 'map', 'created_at', 'updated_at', 'contact_name', 'map_name']
 
 
 class GraphSerializer(serializers.Serializer):