tempfile no longer used, queries for stations with multiple codes work

test_data/auth.json

+[
+  {
+    "password": "pbkdf2_sha256$120000$e6mCx4B1ReAJ$oPEJck70m4p1i6TpAYMehDJ3h/DgSiqEa7juOAM2u3g=",
+    "last_login": "2020-03-12T10:48:36.616Z",
+    "is_superuser": false,
+    "username": "AnonymousUser",
+    "first_name": "Anonymous",
+    "last_name": "User",
+    "email": "",
+    "is_staff": false,
+    "is_active": false,
+    "date_joined": "2020-03-03T12:32:29Z"
+  }
+]