I'm adding some end-to-end sync tests to Lighthouse CI, and thought about utilising this tool. This is great.

Currently it looks like I can already use this tool for various purposes

• testing forward sync (both long & short slot range)
• testing if a client can serve sync requests (by using a single client type to serve all requests)

I think it would be useful if this can be expanded to cover checkpoint sync as well, i.e. adding a node some time after genesis and checkpoint sync to the testnet - this would make sure we cover backfilling as well.

This is pretty easy to achieve with ethereum-package on a live network or running devnet - although devnets don't stay live for too long, so in order to test the next fork - it would be nice to be able to do this on a local network. I'm not sure if this is straight forward to do though.

I tried using kt service update to purge a CL node db and checkpoint sync, but the command doesn't seem to work.

Maybe someone has better ideas?