update

models.py

@@ -1,9 +1,37 @@
+# axc_ul/models.py
+
 from django.db import models
+from django.db.models import UniqueConstraint
+
+
+
+
+class Survey(models.Model):
+    
+    number = models.IntegerField(unique=True)
+    
+    # nside = models.IntegerField(
+    #     default=4096
+    # )
+    
+    def __str__(self):
+        return f"Survey {self.number} of NSIDE {self.nside}"
+
+
+
+
 
 class Pixel(models.Model):
     
     id = models.AutoField(primary_key=True)
     
+    survey = models.ForeignKey(
+        Survey,
+        on_delete=models.CASCADE,
+        related_name='pixels',
+        default=0
+    )
+    
     hpid = models.IntegerField(db_index=True)
     
     counts = models.IntegerField()
@@ -12,3 +40,10 @@ class Pixel(models.Model):
     
     contaminated = models.BooleanField(default=False)
     
+    class Meta:
+        constraints = [
+            UniqueConstraint(fields=['survey', 'hpid'], name='unique_hpid_per_survey'),
+        ]
+    
+    def __str__(self):
+        return f"Pixel {self.id} (Survey {self.survey.number})"