I've been using the free, open-source React Admin https://marmelab.com/react-admin/ framework for this use case, and I really like how it works and how little code I need to write. I used it to quickly build an internal CMS, and it handles relational stuff well. For instance, if I have pieces of content, each of which can have multiple tags, it handles all the tag lookups using typical REST API calls. Also integrates well with our existing auth system (AWS Cognito).

There are some other low-code tools that have similar premises and offer things like ETL tools. We evaluated one called Retool https://retool.com and it seemed pretty cool, but because it's a per-user pricing model, the costs can be pretty substantial when you have a lot of people using the tool.