#1 base_date が意味をなしてゐなかったのを修正

nico.py

@@ -127,7 +127,9 @@ def get_kiriban_list (
 ) -> list[tuple[int, VideoInfo, datetime]]:
     kiriban_list: list[tuple[int, VideoInfo, datetime]] = []
 
-    latest_fetched_at = cast (date, VideoHistory.max ('fetched_at'))
+    latest_fetched_at = cast (date, (VideoHistory
+                                     .where ('fetched_at', '<=', base_date)
+                                     .max ('fetched_at')))
     previous_fetched_at = cast (date, (VideoHistory
                                        .where ('fetched_at', '<', latest_fetched_at)
                                        .max ('fetched_at')))