Saving Issue with Redis

Description

We've received reports indicating that when using Redis for caching, some whiteboards do not retain data as expected. Although switching to LRU has temporarily restored lost content, this suggests there might be an underlying issue with the Redis data persistence or configuration.

Steps to Reproduce

1. Configure the whiteboard app using Redis as specified in the .env file.
2. Create or update a whiteboard.
3. After some time, re-open the whiteboard to check for data consistency.

Expected Behavior

The whiteboard content should persist reliably between sessions.

Actual Behavior

Some users are reporting that whiteboards appear empty or partially loaded, possibly due to issues in saving data with Redis.