This is fantastic. I have hemmed and hawed in doing similar things to build a serverless database. (both in the embedded sense and the FaaS sense) I could have a file or more per client and pay nothing until they load the app. There are a lot of use-cases as in mine that have low read frequency and low or no updates yet high write throughput. I would love to not have to pay for keeping all my indexes in hot ram If at all possible by sacrificing a cold-start and maybe some latency. I could see doing that with Litestream.