[sandhya6]

Regarding permissions, I think we meet your requirements. End users do not have permission to tables directly, they can only enter data through forms and sheets.

Regarding "created by", do you mean a field that is automatically set, based on who created the record? That's on our todo list.

Regarding relational data, we meet your requirements. Any time there is a foreign key, we display a "..." button which shows up with records from the foreign table you can select the row you want. This is fairly sophisticated... you can display all records from the foreign table (default), our you can have a query, and you can even have cascading dropdowns (for example you select Region in the first dropdown, then it shows Cities in that region in the next dropdown and so on), then matching rows are shown.

Regarding user management we store users and permissions separately from databases, and the permissions you applies to all databases in the application. Permissions are set at the application level and you can create a different application (with connections to same databases if needed) if you want different permissions.