introduce plan ordering and marking as best

hub/services/models/services.py

@@ -139,16 +139,42 @@ class Plan(models.Model):
         ServiceOffering, on_delete=models.CASCADE, related_name="plans"
     )
 
+    # Ordering and highlighting fields
+    order = models.PositiveIntegerField(
+        default=0,
+        help_text="Order of this plan in the offering (lower numbers appear first)",
+    )
+    is_best = models.BooleanField(
+        default=False, help_text="Mark this plan as the best/recommended option"
+    )
+
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
 
     class Meta:
-        ordering = ["name"]
+        ordering = ["order", "name"]
         unique_together = [["offering", "name"]]
 
     def __str__(self):
         return f"{self.offering} - {self.name}"
 
+    def clean(self):
+        # Ensure only one plan per offering can be marked as "best"
+        if self.is_best:
+            existing_best = Plan.objects.filter(
+                offering=self.offering, is_best=True
+            ).exclude(pk=self.pk)
+            if existing_best.exists():
+                from django.core.exceptions import ValidationError
+
+                raise ValidationError(
+                    "Only one plan per offering can be marked as the best option."
+                )
+
+    def save(self, *args, **kwargs):
+        self.clean()
+        super().save(*args, **kwargs)
+
     def get_price(self, currency_code: str):
         price_obj = PlanPrice.objects.filter(plan=self, currency=currency_code).first()
         if price_obj: