fix: improving logic for querying flux or activity id

Author: Ramir Mesquita

src/apps/answers/crud/answers.py

@@ -235,10 +235,13 @@ async def get_respondents_submit_dates(
         query = query.where(func.date(AnswerSchema.created_at) <= filters.to_date)
         query = query.where(AnswerSchema.applet_id == applet_id)
         query = query.where(
-            or_(
-                AnswerSchema.id_from_history_id(AnswerSchema.activity_history_id) == str(filters.activity_or_flow_id),
-                AnswerSchema.id_from_history_id(AnswerSchema.flow_history_id) == str(filters.activity_or_flow_id),
-            ),
+                case(
+                    (
+                        AnswerSchema.flow_history_id.isnot(None),
+                        AnswerSchema.id_from_history_id(AnswerSchema.flow_history_id) == str(filters.activity_or_flow_id),
+                    ),
+                    else_=AnswerSchema.id_from_history_id(AnswerSchema.activity_history_id) == str(filters.activity_or_flow_id),
+                )
         )
 
         if filters.respondent_id: