This is the server component for the Bitcoin wallet Electrum's label synchronization feature.
There is a public node available at http://sync.bysh.me:8080/.
A Docker file is included in the repository. You can pull it using docker pull maran/electrum-sync-server and then start it using docker run -p 0.0.0.0:8080:8080 --rm -v $PWD:/data maran/electrum-sync-server. You can change $PWD to a folder where you want to save the database file on the host.
This project is 'go get(able)' install Go and do go get -u github.com/maran/electrum-sync-server.