If Redis crashes, how did you handle this situation? Were the data from the last hour lost?

If Redis crashed, we used several approaches to minimize data loss and ensure stability:

1. Persistence configuration — enabled RDB and/or AOF to save data to disk at a certain frequency.
2. Replication — used master-slave architecture so that when the master failed, the slave could quickly take over.
3. Monitoring and alerts — responded promptly to crashes.
4. Cache with backup — critical data was duplicated in databases or other storage.

As a result, data from the last hour could be partially lost if it was not written to disk (depending on AOF and RDB settings), but in most cases, losses were minimized due to replication and persistence.