Refactor model imports and update admin classes to use pghistory for historical tracking; replace HistoricalModel with TrackedModel in relevant models

designers/models.py

@@ -1,8 +1,10 @@
 from django.db import models
 from django.utils.text import slugify
-from simple_history.models import HistoricalRecords
+from history_tracking.models import TrackedModel
+import pghistory
 
-class Designer(models.Model):
+@pghistory.track()
+class Designer(TrackedModel):
     name = models.CharField(max_length=255)
     slug = models.SlugField(max_length=255, unique=True)
     description = models.TextField(blank=True)
@@ -11,7 +13,6 @@ class Designer(models.Model):
     headquarters = models.CharField(max_length=255, blank=True)
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
-    history = HistoricalRecords()
 
     class Meta:
         ordering = ['name']
@@ -30,8 +31,13 @@ class Designer(models.Model):
         try:
             return cls.objects.get(slug=slug), False
         except cls.DoesNotExist:
-            # Check historical slugs
-            history = cls.history.filter(slug=slug).order_by('-history_date').first()
+            # Check historical slugs using pghistory
+            history_model = cls.get_history_model()
+            history = (
+                history_model.objects.filter(slug=slug)
+                .order_by('-pgh_created_at')
+                .first()
+            )
             if history:
-                return cls.objects.get(id=history.id), True
+                return cls.objects.get(id=history.pgh_obj_id), True
             raise cls.DoesNotExist("No designer found with this slug")