Handle duplicate key error on user patch

src/api/users.py

@@ -4,6 +4,7 @@ from typing import Annotated, final
 from beanie import PydanticObjectId
 from fastapi import APIRouter, Body, HTTPException, Response, status
 from pydantic import BaseModel, EmailStr, StringConstraints
+from pymongo.errors import DuplicateKeyError
 from starlette.status import HTTP_204_NO_CONTENT
 
 from src.api.auth.dependencies import LoggedInDep
@@ -184,7 +185,13 @@ async def patch_user(
             detail="You're not authorized to update this user",
         )
 
-    user = await data.update_user(user)
+    try:
+        user = await data.update_user(user)
+    except DuplicateKeyError:
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="Username or email already taken",
+        )
 
     return UserData.from_user(user)