add: 添加每月最后一天调度

webgui/api/server.py

@@ -38,6 +38,7 @@ ALLOWED_ORIGINS = {
 }
 VALID_ACTIONS = {"copy", "sync", "move"}
 VALID_SCHEDULE_KINDS = {"daily", "weekly", "monthly"}
+MONTHDAY_LAST = 0
 
 db_lock = threading.RLock()
 scheduler_lock = threading.RLock()
@@ -142,13 +143,15 @@ def compute_next_run_at(
         return iso(local_to_utc(candidate, offset_minutes))
 
     if kind == "monthly":
-        if monthday is None or monthday < 1 or monthday > 31:
-            raise ValueError("scheduleMonthday must be 1-31")
+        if monthday is None or monthday < MONTHDAY_LAST or monthday > 31:
+            raise ValueError("scheduleMonthday must be 0-31")
         for offset_months in range(0, 36):
             year, month = add_months(local_after.year, local_after.month, offset_months)
-            if monthday > monthrange(year, month)[1]:
+            days_in_month = monthrange(year, month)[1]
+            candidate_day = days_in_month if monthday == MONTHDAY_LAST else monthday
+            if candidate_day > days_in_month:
                 continue
-            candidate = datetime(year, month, monthday, hour, minute)
+            candidate = datetime(year, month, candidate_day, hour, minute)
             if candidate > local_after:
                 return iso(local_to_utc(candidate, offset_minutes))
         raise ValueError("could not compute next monthly run")