discard "Kd ratio" compound activities from "best activity"

this complements work in a075f990
related to #204

ippisite/ippidb/models.py

@@ -1038,9 +1038,7 @@ class TestActivityDescription(models.Model):
     nb_active_compounds = models.IntegerField(
         verbose_name="Total number of active compounds"
     )
-    cell_line = models.ForeignKey(
-        CellLine, on_delete=models.SET_NULL, null=True
-    )
+    cell_line = models.ForeignKey(CellLine, on_delete=models.SET_NULL, null=True)
 
     def get_complexes(self):
         """
@@ -1326,7 +1324,12 @@ def update_compound_cached_properties(compounds_queryset=None):
         ),
         best_activity=Subquery(
             compounds_queryset.filter(id=OuterRef("id"))
-            .annotate(_best_activity=Max("compoundactivityresult__activity"))
+            .annotate(
+                _best_activity=Max(
+                    "compoundactivityresult__activity",
+                    filter=~Q(compoundactivityresult__activity_type="KdRat"),
+                )
+            )
             .values("_best_activity")[:1]
         ),
         le=Subquery(