diff --git a/nanapi/utils/anilist.py b/nanapi/utils/anilist.py
index b14d0ff..33988a0 100644
--- a/nanapi/utils/anilist.py
+++ b/nanapi/utils/anilist.py
@@ -2,9 +2,10 @@
 import logging
 import time
 from abc import ABC, abstractmethod
+from collections.abc import Generator
 from dataclasses import dataclass, field
 from itertools import batched, count, filterfalse
-from typing import Any, Generator, Generic, Optional, Self, Type, TypeVar
+from typing import Any, Generic, Self, TypeVar, override
 
 import aiohttp
 import orjson
@@ -172,7 +173,7 @@ class ALAPI:
     def __init__(self):
         self.low_priority_ready = asyncio.Event()
         self.low_priority_ready.set()
-        self.reset_task: Optional[asyncio.Task] = None
+        self.reset_task: asyncio.Task | None = None
         self._reset_at = 0
         self.last_request_time = 0
         self._remaining = ALAPI.RATE_LIMIT
@@ -326,6 +327,16 @@ def load(self, media_ids: list[MediaSelectAllIdsResult]):
 #########
 # Lists #
 #########
+
+
+@dataclass(frozen=True)
+class ListEntry:
+    id_al: int
+    status: str
+    progress: int
+    score: int
+
+
 class Userlist:
     service: AnilistService
 
@@ -334,11 +345,11 @@ def __init__(self, username: str):
 
     async def refresh(
         self, media_type: MediaType, al_low_priority: bool = False
-    ) -> tuple[list[dict], set[ALMedia]]:
-        return [], set()
+    ) -> tuple[set[ListEntry], set[ALMedia]]:
+        return set(), set()
 
     def to_edgedb(
-        self, media_type: MediaType, entries: list[dict], medias: set[ALMedia]
+        self, media_type: MediaType, entries: set[ListEntry], medias: set[ALMedia]
     ) -> dict[str, Any]:
         nodes = [m.to_edgedb() for m in medias]
         edgedb_data = dict(
@@ -346,7 +357,7 @@ def to_edgedb(
             service=self.service.value,
             username=self.username,
             type=media_type.value,
-            entries=entries,
+            entries=list(entries),
         )
         return edgedb_data
 
@@ -359,18 +370,21 @@ def __str__(self):
 class ALUserlist(Userlist):
     service = AnilistService.ANILIST
 
-    async def refresh(self, media_type: MediaType, al_low_priority=False):
+    @override
+    async def refresh(
+        self, media_type: MediaType, al_low_priority=False
+    ) -> tuple[set[ListEntry], set[ALMedia]]:
         await super().refresh(media_type)
 
         # fetch updated list
         entries = await self.fetch_entries(media_type, al_low_priority)
 
-        new_entries = []
-        new_medias = set()
+        new_entries = set[ListEntry]()
+        new_medias = set[ALMedia]()
         for entry in entries:
             almedia = ALMedia.model_validate(entry['media'])
-            new_entries.append(
-                dict(
+            new_entries.add(
+                ListEntry(
                     id_al=almedia.id,
                     status=entry['status'],
                     progress=entry['progress'],
@@ -438,7 +452,10 @@ class MALUserlist(Userlist):
 
     refresh_lock = asyncio.Lock()
 
-    async def refresh(self, media_type: MediaType, al_low_priority=False):
+    @override
+    async def refresh(
+        self, media_type: MediaType, al_low_priority=False
+    ) -> tuple[set[ListEntry], set[ALMedia]]:
         await super().refresh(media_type)
 
         for _ in range(3):
@@ -450,13 +467,13 @@ async def refresh(self, media_type: MediaType, al_low_priority=False):
                 await asyncio.sleep(1)
         else:
             logger.error(f'MALUserlist: refresh failed for {self.username}')
-            return [], set()
+            return set(), set()
 
         al_ids, new_medias = await self.get_al_ids(
             media_type, set(entry.node.id for entry in userlist), low_priority=al_low_priority
         )
 
-        new_entries = []
+        new_entries = set[ListEntry]()
         for entry in userlist:
             if entry.node.id is not None:
                 repeating = (
@@ -473,11 +490,11 @@ async def refresh(self, media_type: MediaType, al_low_priority=False):
                 )
 
                 if id_al := al_ids.get(entry.node.id, None):
-                    new_entries.append(
-                        dict(
+                    new_entries.add(
+                        ListEntry(
                             id_al=id_al,
                             status=status,
-                            progress=progress,
+                            progress=progress or 0,  # FIXME: can be None?
                             score=entry.list_status.score,
                         )
                     )
@@ -556,7 +573,7 @@ def __str__(self):
         return f'https://myanimelist.net/profile/{self.username}'
 
 
-SERVICE_USER_LIST: dict[AnilistService, Type[Userlist]] = {
+SERVICE_USER_LIST: dict[AnilistService, type[Userlist]] = {
     AnilistService.ANILIST: ALUserlist,
     AnilistService.MYANIMELIST: MALUserlist,
 }