feat: add iCal calendar subscriptions

backend/backup/service.py

@@ -19,6 +19,7 @@ from backend.models import (
     BackupImport,
     BackupImportEntity,
     BackupPreflight,
+    CalendarSubscription,
     Countdown,
     Folder,
     Habit,
@@ -65,6 +66,7 @@ ENTITY_MODELS = {
     "habit_pauses": HabitPause,
     "countdowns": Countdown,
     "memos": Memo,
+    "calendar_subscriptions": CalendarSubscription,
     "attachments": Attachment,
 }
 RELATIONS = {
@@ -392,6 +394,9 @@ def _validate_recurrence_graph(parsed: ParsedArchive) -> None:
 
 def validate_archive(parsed: ParsedArchive) -> None:
     unknown = set(parsed.entities) - set(ENTITY_MODELS)
+    # Calendar subscriptions were introduced after backup v2. Treat their
+    # absence as an empty collection so archives from older Dodo releases remain restorable.
+    parsed.entities.setdefault("calendar_subscriptions", [])
     missing = set(ENTITY_MODELS) - set(parsed.entities)
     if unknown:
         raise backup_error("backup_entity_unknown", "备份包含未知实体")
@@ -611,7 +616,16 @@ async def restore_v2(
             await db.execute(delete(HabitPause).where(
                 HabitPause.habit_id.in_(select(Habit.id).where(Habit.user_id == user.id))
             ))
-            for model in (Attachment, Memo, Countdown, Task, Habit, TaskList, Folder):
+            for model in (
+                Attachment,
+                CalendarSubscription,
+                Memo,
+                Countdown,
+                Task,
+                Habit,
+                TaskList,
+                Folder,
+            ):
                 await db.execute(delete(model).where(model.user_id == user.id))
             await db.execute(delete(BackupImportEntity).where(BackupImportEntity.user_id == user.id))
             await db.execute(delete(BackupImport).where(BackupImport.user_id == user.id))