Multi-user flexible-declarative-schema database management webapp

Question

I'm looking for a webapp that can be flexibly and easily customized with a given data schema and then allow multiple users to manage the data

Important:

• Quick to implement, declarative schema/model
• Users get a flexible and intuitive UI for managing both entities and their attributes, and relationships between entities (almost like a graph db)

Nice to haves:

• Uses any SQL backend
• Schema can automatically capture historical state of entities, attributes or relationships
• Some type of SSO authentication

Answer 1

Maybe you'd want to have a look at Simitless. If I understand your question correctly, it should fit what you are looking for:

• uses a declarative data model,
• supports OAuth/SSO with Facebook, Google, LinkedIn, Microsoft, Slack, Twitter,
• enables you to create your own database management web app - it gives you modules/fields (like spreadsheet columns) that you can select from and tailor the app to track/collect only the data you need,
• I think it has quite an intuitive and flexible UI as well,
• uses noSQL backend (you said it would be ok as well),
• you can have as many parallel connections as you want (checks your multi-user requirement),
• has quite a few templates to choose from when building your own data web app.

Here is a screenshot of how one of the templates with dummy data looks like:

May be a worth a look.

Full disclosure: I am part of the startup that designed that platform. We just launched recently, still in beta. If you want to try it out and need some help, I can definitely give you a hand.