Is there a database plugin akin to SQLite for C2?
Nope, but you can use AJAX posts to send data to PHP files, which in turn can interact with the MySql server.
Mine needs to be an offline solution under Windows 7.
I really don't want to have to create my own database and sorting. It's more to go wrong.
Develop games in your browser. Powerful, performant & highly capable.
scirra.com/forum/plugin-firebase_topic79393.html (maybe follow this topic, it could help you, BUT I am not sure how well it exports to node webkit etc.)