valkey-io/valkey ? reverse-engineered prompt

Build me a fast in memory key value database server I can run locally and connect to with a CLI.

It should support basic commands for setting, getting, deleting, expiring, and listing common data structures, plus a simple config file and command line flags so I can start it either with defaults or a custom port and settings. I also want it to be easy to build from source on Linux and macOS, and to include a working test suite so I can verify the server starts, accepts requests, and handles the main features correctly.

If it makes sense, include support for TLS and clustering as optional modes, and make sure the project has clear build and run instructions. Keep performance in mind, since this is for caching and realtime workloads. Use current docs online if you need to check the expected behavior of modern key value servers.