About that I have made the simplest possible implementation of a syslog server in Rust. I use it to collect OpenWrt logs and store them on my server. ;-)

LessPass has the possibility to connect to a database (via its API) to store the configurations made for each site. This API can be used from any of the clients (either the browser extension, the mobile application, etc.).

You set up the DB server wherever you want. If you want something light you can use this implementation. And if you are interested, there is also a command line client.