Hi! I have a question about Kratos. Does it have some mechanism similar to Hydra janitor to clean old data? Because table like selfservice_login_flows continues to grow and i see there many outdated login flows.

not yet! there's an open issue for it though on github and someone commented today on it

And is it safe to truncate this tables? they only needed during flow and after flow is completed it is safe to delete data, right?

yes!