Refactor NormalCase model to use age_days instead of age_years, update forms, filters, and templates accordingly for improved age handling

atlas/filters.py

@@ -294,12 +294,14 @@ class NormalCaseFilter(django_filters.FilterSet):
     """
     examination = django_filters.ModelChoiceFilter(queryset=Series.objects.none())
     modality = django_filters.ModelChoiceFilter(queryset=Series.objects.none())
-    min_age = django_filters.NumberFilter(field_name="age_years", lookup_expr="gte", label="Min age")
-    max_age = django_filters.NumberFilter(field_name="age_years", lookup_expr="lte", label="Max age")
+    # Accept min/max as years in the UI but filter against the canonical
+    # `age_days` field by converting years -> days.
+    min_age = django_filters.NumberFilter(label="Min age", method="filter_min_age")
+    max_age = django_filters.NumberFilter(label="Max age", method="filter_max_age")
 
     class Meta:
         model = NormalCase
-        fields = ("examination", "modality", "age_years")
+        fields = ("examination", "modality", "age_days")
 
     def __init__(self, data=None, queryset=None, prefix=None, strict=None, user=None, request=None):
         # Use the global Examination and Modality querysets from the Series model
@@ -319,6 +321,20 @@ class NormalCaseFilter(django_filters.FilterSet):
 
         super(NormalCaseFilter, self).__init__(data=data, queryset=queryset, prefix=prefix, request=request)
 
+    def filter_min_age(self, queryset, name, value):
+        try:
+            days = int(float(value) * 365.25)
+        except Exception:
+            return queryset
+        return queryset.filter(age_days__gte=days)
+
+    def filter_max_age(self, queryset, name, value):
+        try:
+            days = int(float(value) * 365.25)
+        except Exception:
+            return queryset
+        return queryset.filter(age_days__lte=days)
+
 class QuestionSchemaFilter(django_filters.FilterSet):
     class Meta:
         model = QuestionSchema