feat: add error message page; improve admin ui; add missing test files

aircox/management/commands/diffusions.py

@@ -11,7 +11,7 @@ from argparse import RawTextHelpFormatter
 from django.core.management.base import BaseCommand
 from django.utils import timezone as tz
 
-from aircox.controllers.diffusions import Diffusions
+from aircox.controllers.diffusion_monitor import DiffusionMonitor
 
 logger = logging.getLogger("aircox.commands")
 
@@ -70,7 +70,7 @@ class Command(BaseCommand):
                 date += tz.timedelta(days=28)
             date = date.replace(day=1)
 
-        actions = Diffusions(date)
+        actions = DiffusionMonitor(date)
         if options.get("update"):
             actions.update()
         if options.get("clean"):