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app/usecases/user_achievements.py

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+from __future__ import annotations
+
+import app.repositories.user_achievements
+from app._typing import UNSET
+from app._typing import _UnsetSentinel
+from app.repositories.user_achievements import UserAchievement
+
+
+async def create(user_id: int, achievement_id: int) -> UserAchievement:
+    user_achievement = await app.repositories.user_achievements.create(
+        user_id,
+        achievement_id,
+    )
+    return user_achievement
+
+
+async def fetch_many(
+    user_id: int | _UnsetSentinel = UNSET,
+    page: int | None = None,
+    page_size: int | None = None,
+) -> list[UserAchievement]:
+    user_achievements = await app.repositories.user_achievements.fetch_many(
+        user_id=user_id,
+        page=page,
+        page_size=page_size,
+    )
+    return user_achievements