Handle logout and user-dependent queries

[bacarybruno]

Heyo all 👋

We are currently developing a React Native app that uses TanStack Query. This app is available in multiple countries, and users can have accounts in different countries. Additionally, users can use the app without being logged in.

We have several queries in the app that depend on the connected user. But we are not directly sending the user ID in the query parameters: the backend identifies the user based on cookies.

I need your recommendations on how we should handle query keys and user login / logout / change country etc. We have a few potential solutions:
1️⃣ Add userId and country to each query key: This ensures data is refetched whenever the user or country changes
2️⃣ Prefix query keys with something like ['ME', ...]: this allows us to invalidate all queries that depend on a specific user
3️⃣ Clear the React Query cache or invalidate all queries on logout
4️⃣ Put a lower gc_time: can be done in combinaison with other solutions maybe?
5️⃣ Insert your solution here

What do you think would be the best practice for our case?
Thanks for your help 🙏

[TkDodo]

1 and 3 together sounds good