fix: only delete old map layers at beginning of dataset ingest

sample_data/use_cases/new_york_energy/import_networks.py

@@ -8,7 +8,7 @@
 from django.contrib.gis.measure import D
 from django.contrib.gis.db.models.functions import Distance
 from django.contrib.gis.geos import Point, LineString
-from uvdat.core.models import Network, NetworkEdge, NetworkNode
+from uvdat.core.models import Network, NetworkEdge, NetworkNode, VectorMapLayer
 from uvdat.core.tasks.networks import vector_features_from_network
 
 
@@ -75,6 +75,7 @@ def perform_import(dataset, **kwargs):
     print('\tEstimated time: 90 minutes.')
     start = datetime.now()
     Network.objects.filter(dataset=dataset).delete()
+    VectorMapLayer.objects.filter(dataset=network.dataset).delete()
     for file_item in dataset.source_files.all():
         with tempfile.TemporaryDirectory() as temp_dir:
             archive_path = Path(temp_dir, 'archive.zip')

sample_data/use_cases/new_york_energy/nysdp.py

@@ -123,6 +123,7 @@ def download_all_deduped_vector_features(**kwargs):
 def create_consolidated_network(dataset, **kwargs):
     start = datetime.now()
     Network.objects.filter(dataset=dataset).delete()
+    VectorMapLayer.objects.filter(dataset=network.dataset).delete()
     gdf = download_all_deduped_vector_features(**kwargs)
 
     zones_dataset_name = kwargs.get('zones_dataset_name')

uvdat/core/tasks/networks.py

@@ -6,7 +6,7 @@
 import numpy
 import shapely
 
-from uvdat.core.models import Network, NetworkEdge, NetworkNode, VectorFeature, VectorMapLayer
+from uvdat.core.models import Network, NetworkEdge, NetworkNode, VectorFeature
 
 NODE_RECOVERY_MODES = [
     'random',
@@ -214,7 +214,6 @@ def geojson_from_network(dataset):
 
 
 def vector_features_from_network(network):
-    VectorMapLayer.objects.filter(dataset=network.dataset).delete()
     map_layer, created = VectorMapLayer.objects.get_or_create(dataset=network.dataset, index=0)
     VectorFeature.objects.bulk_create(
         [