Add v2 snapshot schema validation and import_snapshots command

apps/ingestion/management/commands/import_snapshots.py

@@ -0,0 +1,23 @@
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from apps.ingestion.services.snapshot_import import SnapshotImporter
+
+
+class Command(BaseCommand):
+    help = "Import static JSON snapshots from incoming directory into PostgreSQL."
+
+    def handle(self, *args, **options):
+        importer = SnapshotImporter(
+            incoming_dir=settings.STATIC_DATASET_INCOMING_DIR,
+            archive_dir=settings.STATIC_DATASET_ARCHIVE_DIR,
+            failed_dir=settings.STATIC_DATASET_FAILED_DIR,
+        )
+        run = importer.run()
+        self.stdout.write(
+            self.style.SUCCESS(
+                f"Import run {run.id} completed: status={run.status} "
+                f"files={run.files_processed}/{run.files_total} "
+                f"rows_upserted={run.rows_upserted} rows_failed={run.rows_failed}"
+            )
+        )