perf: improved campaigns suggestion perfomance by caching some things

solution/services/backend/apps/campaign/management/commands/init_cache.py

@@ -0,0 +1,35 @@
+from typing import Any
+
+from django.core.management.base import BaseCommand
+
+from apps.campaign.models import Campaign
+from apps.mlscore.models import Mlscore
+
+
+class Command(BaseCommand):
+    help = (
+        "Initialize cache with current counts of "
+        "impressions, clicks, and ML scores."
+    )
+
+    def handle(self, *args: Any, **kwargs: Any) -> None:
+        for campaign in Campaign.objects.all():
+            campaign.setup_cache()
+            self.stdout.write(
+                self.style.SUCCESS(
+                    f"Initialized cache for Campaign {campaign.id}: "
+                    f"{campaign.impressions_count} impressions, "
+                    f"{campaign.clicks_count} clicks."
+                )
+            )
+
+        for mlscore in Mlscore.objects.all():
+            mlscore.setup_cache()
+            self.stdout.write(
+                self.style.SUCCESS(
+                    f"Initialized cache for MLscore: "
+                    f"Client {mlscore.client_id}, "
+                    f"Advertiser {mlscore.advertiser_id}, "
+                    f"Score {mlscore.score}."
+                )
+            )