Adding SUrvexFix class

core/models/survex.py

@@ -195,6 +195,22 @@ class SurvexBlockLookUpManager(models.Manager):
             block = SurvexBlock.objects.get(parent=block, name__iexact=blockname)
         return block
 
+class SurvexFix(models.Model):
+    """a *fix line in a survexfile. New at the end of expo in  July 2025
+    This is used to detect *fix stations which are not attached to a *entrance and thus to a cave
+    i.e. it is used to discover potential cave entrances
+    
+    But this does not include the virtual *fix locations which are
+    in locations.py 
+    """
+    objects = SurvexBlockLookUpManager() # overwrites Survexfix.objects and enables lookup()
+    name = models.CharField(max_length=100)
+    class Meta:
+        ordering = ("name",)
+        
+    def __str__(self):
+        return self.name + str(self.id)
+ 
 
 class SurvexBlock(models.Model):
     """One begin..end block within a survex file. The basic element of a survey trip.