I have some simple applications that use Redis. I swapped out the Redis server for Valkey. The apps didn't notice. I use the Redis module.

My weatherstation reports current readings to my server with an HTTP post. A perl program records the readings into a database. It then connects to Redis and reads the previous settings, compares them to the new readings, and publishes any changed readings to a Redis topic after storing the newest readings. Another perl program displays the current readings from Redis using Curses, then listens to the topic for updates.