fixed a bunch of things, hopefully didn't break things

history_tracking/models.py

@@ -1,14 +1,39 @@
 # history_tracking/models.py
 from django.db import models
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes.fields import GenericForeignKey
 from simple_history.models import HistoricalRecords
 from .mixins import HistoricalChangeMixin
+from typing import Any, Type, TypeVar, cast
 
+T = TypeVar('T', bound=models.Model)
 
 class HistoricalModel(models.Model):
     """Abstract base class for models with history tracking"""
+    history: HistoricalRecords = HistoricalRecords(inherit=True)
+
     class Meta:
         abstract = True
 
     @property
-    def _history_model(self):
-        return self.history.model
+    def _history_model(self) -> Type[T]:
+        """Get the history model class"""
+        return cast(Type[T], self.history.model)  # type: ignore
+
+class HistoricalSlug(models.Model):
+    """Track historical slugs for models"""
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey('content_type', 'object_id')
+    slug = models.SlugField(max_length=255)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        unique_together = ('content_type', 'slug')
+        indexes = [
+            models.Index(fields=['content_type', 'object_id']),
+            models.Index(fields=['slug']),
+        ]
+
+    def __str__(self) -> str:
+        return f"{self.content_type} - {self.object_id} - {self.slug}"