feat: improve audit exports and admin analytics

ai_knowledge_base_v2/apps/backend/app/api/feedback.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import UTC, date, datetime, time, timedelta
+from datetime import UTC, date, datetime, timedelta
 from io import BytesIO
 
 from fastapi import APIRouter, Depends, HTTPException, Query, status
@@ -18,6 +18,7 @@ from app.api.pagination import page_result
 from app.core.database import get_db
 from app.core.dependencies import get_current_admin, get_current_user
 from app.core.responses import api_success
+from app.core.time_utils import business_day_boundary, to_business_naive
 from app.models.admin import Admin
 from app.models.chat import ChatMessage, ChatSession
 from app.models.feedback import MessageFeedback
@@ -136,9 +137,9 @@ def _feedback_query(read_status: str, start_date: date | None, end_date: date |
     if read_status != "all":
         query = query.where(MessageFeedback.is_read == (1 if read_status == "read" else 0))
     if start_date is not None:
-        query = query.where(MessageFeedback.created_at >= datetime.combine(start_date, time.min))
+        query = query.where(MessageFeedback.created_at >= business_day_boundary(start_date))
     if end_date is not None:
-        query = query.where(MessageFeedback.created_at < datetime.combine(end_date + timedelta(days=1), time.min))
+        query = query.where(MessageFeedback.created_at < business_day_boundary(end_date, end_exclusive=True))
     return query
 
 
@@ -159,8 +160,8 @@ def _feedback_workbook(rows: list[tuple]) -> Workbook:
             _excel_safe_text(session.title),
             message.id,
             _excel_safe_text(ensure_ai_generated_notice(message.content)),
-            feedback.created_at,
-            feedback.read_at,
+            to_business_naive(feedback.created_at),
+            to_business_naive(feedback.read_at),
         ])
     header_fill = PatternFill("solid", fgColor="1F6F5F")
     for cell in sheet[1]: