packages/django-postgres-cache: use upsert instead of select/update in a transaction (#17760)

packages/django-postgres-cache/django_postgres_cache/models.py

@@ -1,12 +1,14 @@
 from django.db import models
+from psqlextra.manager import PostgresManager
 
 
 class CacheEntry(models.Model):
-
     cache_key = models.TextField(primary_key=True)
     value = models.TextField()
     expires = models.DateTimeField(db_index=True)
 
+    objects = PostgresManager()  # type: ignore[no-untyped-call]
+
     class Meta:
         default_permissions = []