add diagnostic certainty

atlas/models.py

@@ -237,6 +237,14 @@ class Case(models.Model):
     #    VASC = "VA", _("Vascular")
     #    HAEMONC = "HA", _("Haemotology and Oncology")
 
+    class CertaintyChoices(models.IntegerChoices):
+        NONE = 0
+        POSSIBLE = 1
+        LIKELY = 2
+        ALMOST_CERTAIN = 3
+        CERTAIN = 4
+
+
     title = models.CharField(max_length=255, help_text="Title of the case", default="")
     description = models.TextField(
         blank=True,
@@ -266,6 +274,8 @@ class Case(models.Model):
         Condition, through=Differential, related_name="casedifferential"
     )
 
+    diagnostic_certainty = models.IntegerField(choices=CertaintyChoices.choices, default=CertaintyChoices.NONE)
+
     verified = models.BooleanField(default=False)
     created_date = models.DateTimeField(default=timezone.now)
     published_date = models.DateTimeField(blank=True, null=True)