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worker-template-mysql
Reference demo and modified MySQL driver to connect Cloudflare Workers to a relational database.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Not that I know. I only am aware of the Relational Database Connectors to Workers that I mentioned. This means you could have a Workers script do whatever you like while your database safely rests on a for example Linux server - which does not have to have any open ports thanks to cloudflare tunnels. Found this: https://github.com/cloudflare/worker-template-mysql