fix: support yearly recurrence in calendar

backend/mvp.py

@@ -64,8 +64,8 @@ def parse_rrule(value: str) -> dict[str, str]:
             raise HTTPException(422, "无效的 RRULE")
         key, val = part.split("=", 1)
         parts[key] = val
-    if parts.get("FREQ") not in {"DAILY", "WEEKLY", "MONTHLY"}:
-        raise HTTPException(422, "仅支持 DAILY、WEEKLY、MONTHLY")
+    if parts.get("FREQ") not in {"DAILY", "WEEKLY", "MONTHLY", "YEARLY"}:
+        raise HTTPException(422, "仅支持 DAILY、WEEKLY、MONTHLY、YEARLY")
     try:
         if "INTERVAL" in parts and int(parts["INTERVAL"]) < 1:
             raise ValueError
@@ -103,10 +103,15 @@ def occurrences(rule: str, starts: datetime, start: datetime, end: datetime, cut
         elif parts["FREQ"] == "WEEKLY":
             days = {_WEEKDAYS[x] for x in parts.get("BYDAY", list(_WEEKDAYS)[starts.weekday()]).split(",")}
             include = cursor.weekday() in days and ((cursor.date() - starts.date()).days // 7) % interval == 0
-        else:
+        elif parts["FREQ"] == "MONTHLY":
             month_delta = (cursor.year - starts.year) * 12 + cursor.month - starts.month
             month_days = {int(x) for x in parts.get("BYMONTHDAY", str(starts.day)).split(",")}
             include = month_delta % interval == 0 and cursor.day in month_days
+        else:
+            years = cursor.year - starts.year
+            months = {int(x) for x in parts.get("BYMONTH", str(starts.month)).split(",")}
+            month_days = {int(x) for x in parts.get("BYMONTHDAY", str(starts.day)).split(",")}
+            include = years % interval == 0 and cursor.month in months and cursor.day in month_days
         if include and cursor >= starts:
             emitted += 1
             if start <= cursor <= end:

tests/test_mvp_backend.py

@@ -31,10 +31,18 @@ def test_recurring_calendar_exceptions_and_scopes(client):
     )
     assert recurrence.status_code == 201
     recurrence_id = recurrence.json()["id"]
+    yearly = client.post(
+        "/api/v1/tasks",
+        json={"title": "年度任务", "list_id": inbox["id"], "due_at": "2026-09-06T09:00:00Z"},
+    ).json()
+    assert client.post(
+        "/api/v1/recurrences", json={"task_id": yearly["id"], "rrule": "FREQ=YEARLY;INTERVAL=1;BYMONTH=9;BYMONTHDAY=6"}
+    ).status_code == 201
     calendar = client.get(
         "/api/v1/calendar", params={"start": "2026-09-01", "end": "2026-09-30"}
     ).json()
     assert any(row.get("id") == normal_task["id"] for row in calendar)
+    assert any(row["title"] == "年度任务" for row in calendar)
     assert not any(row["title"] == "月外普通任务" for row in calendar)
     occurrences = [row for row in calendar if row["recurrence_id"] == recurrence_id]
     assert len(occurrences) == 5